JP6009333B2 - Filter press type dehydrator and filter cloth set - Google Patents

Description

  The present invention relates to a filter press type dehydrator and a filter cloth set. More specifically, the present invention relates to a filter press-type dewatering device and a filter cloth set for dewatering a slurry to produce a dewatered cake.

  There are known dredging works carried out to secure water depth, prevent the generation of odors and protect aquatic organisms by removing sediments, garbage and sludge accumulated in harbors, lakes, rivers, ponds and digging ing. Dredged mud generated during dredging work is a liquid with a high water content and is also called dredged sludge.

  A high pressure filter press type dehydrator is used as a method for separating and reducing moisture from a stock solution (also referred to as a slurry) obtained by removing dust, stones and gravel from sludge. In the dehydration process by the high-pressure filter press dehydrator, first, a low-pressure pump with a relatively large discharge amount is started, and the slurry is transferred from the slurry tank in which the slurry is stored to the filter chamber of the high-pressure filter press dehydrator. Fill the chamber rapidly. Next, a high-pressure pump having a relatively high discharge pressure is started to drive the slurry into the filter chamber at a high pressure. By such treatment, the slurry dehydrated at high pressure in the filter chamber of the high pressure filter press dehydrator becomes a solid dehydrated cake and is discharged from the high pressure filter press dehydrator.

  Various methods for reusing dewatered cake discharged from a filter press dehydrator including a high pressure filter press dehydrator have been proposed.

  Patent Document 1 describes a technique for increasing the strength of a dehydrated cake by mixing cement, quicklime or other stabilizers in a slurry to produce a dehydrated cake. Patent Document 2 describes a technique for increasing the strength of the dehydrated cake and reducing the re-extraction of the eutrophication substance by adding powdered magnesium oxide fired to the slurry.

  Patent Documents 3 and 4 describe an apparatus for pulverizing a dewatered cake discharged from a filter press type dewatering apparatus. The apparatuses described in Patent Documents 3 and 4 crush the dehydrated cake by pressing the dehydrated cake with a large number of pressing protrusions after the dehydrated cake discharged from the filter press-type dewatering device is conveyed by a belt conveyor. Is.

  However, in the techniques described in the cited documents 1 to 4, when the dewatered cake is discharged from the filter press-type dewatering device and dropped, it is crushed into small pieces having an irregular shape. There was a problem that it was difficult to use as a recycled construction material.

  Patent Document 5 discloses a plurality of dehydrated cakes having a rectangular parallelepiped shape by applying a resin to a filter cloth or adhering a low friction material to the filter cloth after fixing a release material to the filter cloth in a streak shape. The technology of dividing into small pieces and discharging from the filter press type dehydrator is described.

Japanese Patent No. 2764645 JP 2006-692 A Japanese Patent No. 3068864 Japanese Patent No. 3068895 JP 2012-157838 A

  In the technique described in Patent Document 5, a dehydrating cake is divided into small pieces having a rectangular parallelepiped shape by disposing a release material on a filter cloth in the form of vertical stripes or horizontal stripes. By disposing the release material on the filter cloth, the surface area of the dehydrated cake in contact with the filter cloth or the release material is increased as compared with the case without the release material. When the surface area of the dewatered cake in contact with the filter cloth or release material increases, the frictional force between the dehydrated cake and the filter cloth or release material increases, and the adhesion strength between the filter cloth and the dewatered cake increases. When the adhesion strength between the filter cloth and the dehydrated cake increases, the dehydrated cake becomes difficult to peel from the filter cloth. In addition, when the release material is disposed on the filter cloth in a striped pattern, the dehydrated cake positioned above the release material is supported by the release material, and the dehydrated cake becomes more difficult to separate from the filter cloth.

  In the technique described in Patent Document 5, a dehydrated cake is easily peeled off by applying a resin to the filter cloth or sticking a low friction material to the filter cloth.

  However, when the resin is applied to the filter cloth, if the applied resin is peeled off, the dehydrated cake becomes difficult to peel from the filter cloth. For this reason, every time the applied resin is peeled off, the resin is applied to the filter cloth, and the maintenance work of the filter press type dehydrating apparatus becomes complicated. In addition, since it is not easy to determine whether or not the applied resin has been peeled off, the dehydration process may continue even after the applied resin has been peeled off. May get worse.

  Further, when a low friction material is attached to the filter cloth, the portion of the filter cloth where the low friction material is attached does not contribute to filtration, and the efficiency of the dehydration treatment of the filter press type dehydrator may be deteriorated.

  Then, an object of this invention is to provide the filter press type | formula dehydration apparatus which can grind | pulverize a dewatering cake into the small piece which has a regular shape. The present invention also provides a filter press-type dewatering device capable of easily peeling a dewatered cake from the filter cloth without employing a resin applied to the filter cloth and a low friction material adhered to the filter cloth. The purpose is to do.

  In order to achieve the above object, a filter press-type dewatering apparatus according to the present invention includes a first filter frame and a second filter frame in which filter surfaces for filtering a slurry are arranged to face each other, and filtration of the first filter frame. The first filter cloth disposed on the surface, the second filter cloth disposed on the filter surface of the second filter frame, and the filter surface of the first filter frame, the first filter cloth for each first distance. The first linear members arranged in parallel with each other in the direction and the filtration surface of the first filter frame are arranged in parallel with each other in a second direction different from the first direction for each second distance. The second linear member, the third linear member arranged in parallel with each other in the first direction for each first distance on the filtration surface of the second filter frame, and the second filter frame And a fourth linear member arranged in parallel with each other in the second direction for each second distance, the first linear member and the third linear member being the first linear member, Direction When viewed from the direction perpendicular are arranged in a staggered manner, the second linear member and the fourth linear member is disposed viewed from a direction orthogonal to the second direction in a staggered manner, characterized in that.

  Furthermore, in the filter press-type dewatering apparatus according to the present invention, the first filter cloth has a first storage portion that stores the first linear member and a second storage portion that stores the second linear member. The second filter cloth preferably has a third storage portion for storing the third linear member and a fourth storage portion for storing the fourth linear member.

  Further, in the filter press-type dewatering device according to the present invention, the first linear member and the second linear member are disposed between the filtration surface of the first filter frame and the first filter cloth, and the third linear member The member and the fourth linear member are preferably disposed between the filtration surface of the second filter frame and the second filter cloth.

  Furthermore, in the filter press type dehydrating apparatus according to the present invention, the first linear member and the third linear member are formed of a metal material, and the second linear member and the fourth linear member are formed of an elastic material. Is preferred.

  Furthermore, in the filter press-type dewatering apparatus according to the present invention, the total height of the first linear member and the second linear member is set so that the first filter frame and the second filter frame are close to each other. The total height of the third linear member and the fourth linear member is equal to or greater than the width of the filter chamber formed by the arrangement. The width of the filter chamber is preferably the same as or larger than the width of the filter chamber.

  Moreover, the filter cloth set which concerns on this invention is arrange | positioned at the filtration surface of a 1st filter frame, and accommodates the 1st linear member arrange | positioned along with mutually parallel in a 1st direction for every 1st distance. A first storage portion, and a second storage portion for storing second linear members arranged in parallel to each other in a second direction different from the first direction for each second distance. A third storage portion for storing a filter cloth, a third linear member disposed on the filtration surface of the second filter frame and disposed in parallel with each other in the first direction for each first distance; A second filter cloth having a fourth storage part for storing a fourth linear member arranged in parallel with each other in the second direction every two distances, and the first filter cloth Is disposed on the filtration surface of the first filter frame and the second filter cloth is disposed on the filtration surface of the second filter frame, the first linear member and the third linear member are direction They are arranged in a staggered manner when viewed from the direction perpendicular, second linear members and the fourth linear member may be arranged in a staggered manner when viewed from the direction perpendicular to the second direction.

  According to the filter press-type dewatering device of the present invention, the first linear member and the third linear member are arranged in a staggered manner as viewed from the direction orthogonal to the first direction, and the second linear member and the first linear member Since the four-wire members are arranged in a staggered manner as viewed from the direction orthogonal to the second direction, a filter press-type dewatering device that easily separates the dewatered cake crushed into small pieces having a regular shape from the filter cloth It became possible to provide.

It is a figure which shows an example of a dehydration processing system. It is the elements on larger scale of the dehydration processing system shown in FIG. It is a conceptual diagram of a high pressure pump. It is a perspective view of an example of a filter frame. It is a disassembled perspective view of an example of a filter frame. (A) is a front view of the filter frame shown in FIG. 4, (b) is a rear view of the filter frame shown in FIG. (A) is a side view of the filter frame shown in FIG. 4, and (b) is a plan view of the filter frame shown in FIG. (A) is AA 'cross section of a filter cloth, (b) is BB' cross section of a filter cloth, (c) is CC 'cross section of a filter cloth, (d ) Is a DD 'cross-sectional view of the filter cloth, (e) is an EE' cross-sectional view of the filter cloth, (f) is an FF 'cross-sectional view of the filter cloth, and (g) is It is GG 'sectional drawing of a filter cloth, (h) is HH' sectional drawing of a filter cloth. It is a figure which shows the spin-drying | dehydration process of a high pressure filter press type | formula dehydrator, (a) shows a preparatory process, (b) shows a filtration process, (c) shows a residual liquid processing process, (d) is an opening. It is a figure which shows a frame process. (A) is a side view of the dewatering cake 403, and (b) is a plan view of the dewatering cake 403. It is a disassembled perspective view of the other example of a filter frame. (A) is a top view of the other example of a filter frame, (b) is a rear view of the other example of a filter frame.

  A dehydration processing system according to the present invention will be described below with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to these embodiments, and extends to equivalents to the invention described in the claims.

  FIG. 1 is a diagram illustrating an example of a dehydration processing system.

  The dehydration processing system 100 includes a transport / pumping unit 110, a pretreatment unit 120, a mud storage unit 130, a reaction unit 140, a high-pressure dehydration processing unit 150, and a water treatment unit 160.

  The transport / pumping unit 110 includes a clay ship 111, a clam shell 112, and a receiving device 113. The clay ship 111 carries dredged soil from the dredging point to the dehydration processing system 100. The clam shell 112 transfers the dredged material carried by the earth ship 111 to the receiving device 113. The receiving device 113 has a vibrating screen, and after removing foreign matters such as driftwood contained in the clay transferred by the clamshell 112, pretreats the clay via a belt conveyor. To the unit 120.

  The pre-processing unit 120 includes a receiving trommel 121, a gravel removal device 122, a trommel belt conveyor 123, and a gravel belt conveyor. The receiving trommel 121 has a cylindrical rotating portion, and rotates the rotating portion to remove impurities such as shells and stones that have not been removed by the clamshell 112 and stones. The gravel removing device 122 removes gravel from the dredged material by guiding the dredged material from which impurities and stones have been removed by the receiving trommel 121 onto a screen having a horizontal plane that vibrates in the vertical direction. The trommel belt conveyor 123 conveys the foreign substances and stones removed by the receiving trommel 121 to a foreign substance collection place. The gravel conveyor belt 124 conveys the gravel removed by the gravel removal device 122 to a gravel collection station.

  The mud storage unit 130 includes a plurality of concentration adjustment tanks 131 and a plurality of mud storage tanks 132. Each of the plurality of concentration adjusting tanks 131 generates muddy water by mixing dilution water supplied via a dilution water tank (not shown) and the clay from which the gravel has been removed by the gravel removing device 122. Each of the plurality of mud storage tanks 132 stores the muddy water generated in the plurality of concentration adjustment tanks 131. Each of the plurality of concentration adjusting tanks 131 and the plurality of mud storage tanks 132 has a stirrer. The stirrer rotates at a constant speed and prevents muddy water from settling.

  The reaction unit 140 includes a plurality of reaction tanks 141, a plurality of slurry tanks 142, a low-pressure pump 143, a PAC tank 144, and a slaked lime storage tank 145. In the plurality of reaction tanks 141, muddy water is transferred from the plurality of mud storage tanks 132 through pipes connected to the plurality of mud storage tanks 132, respectively. PAC (Poly Aluminum Chioride, polyaluminum chloride) is piped from the PAC tank 144 into the pipe connecting the plurality of mud storage tanks 132 and the plurality of reaction tanks 141. In addition, slaked lime is injected into each of the plurality of mud storage tanks 132 from the slaked lime storage tank 145. PAC and slaked lime are dehydration aids, and the PAC is agitation with the mud water by the stirring device inside the reaction tank 141, thereby agglomerating and agglomerating fine particles present in the mud water. In addition, slaked lime contributes to an increase in the strength of the dehydrated cake. The low pressure pump 143 is a pump having a large discharge amount but a small head, that is, a low discharge pressure, and is disposed in each of the plurality of slurry tanks 142.

  FIG. 2 is a partially enlarged view of the high pressure dehydration processing unit 150. In FIG. 2, pipes 201 to 204 through which slurry or filtered water flows are indicated by solid lines, and pressure oil pipes 301 to 304 through which pressurized oil flows are indicated by alternate long and short dash lines.

  The high-pressure dehydration processing unit 150 includes a high-pressure pump 151, a high-pressure filter press-type dewatering device 1, a drainage tank 152, and a pressure oil device 153. The high-pressure pump 151 is a pump having a discharge amount smaller than that of the low-pressure pump 143 but having a head higher than that of the low-pressure pump 143, that is, having a discharge pressure higher than that of the low-pressure pump 143, and is arranged in series with the low-pressure pump 143. When the high-pressure pump 151 is stopped, the slurry transferred from the low-pressure pump 143 is transferred to the filter chamber of the high-pressure filter press-type dehydrator 1 without being pressurized. Further, when the high pressure pump 151 is operating, the high pressure pump 151 pressurizes the slurry transferred from the low pressure pump 143 and press-fits it into the filter chamber of the high pressure filter press type dehydrator 1.

  FIG. 3 is a conceptual diagram of the high-pressure pump 151. In FIG. 3, the pipe through which the slurry flows is indicated by a solid line, and the pressure oil pipe through which the pressure oil or hydraulic oil flows is indicated by a dashed line.

  The high pressure pump 151 includes a first pump chamber 154, a second pump chamber 155, a first suction valve 157a, a first discharge valve 157b, a second suction valve 157c, a second discharge valve 157d, and a metering cylinder 158. And a drive cylinder 159.

  The first pump chamber 154 includes a first hydraulic oil chamber 154p, a first intermediate chamber 154m, and a first suction / discharge chamber 154w. In the first hydraulic oil chamber 154p, hydraulic oil flows in and out in accordance with the movement of the metering cylinder 158. The first intermediate chamber 154m includes a liquid mixed with antifreeze and is adjacent to the first hydraulic oil chamber 154p and the first suction chamber 154w via a rubber film. The rubber films positioned at both ends of the first intermediate chamber 154m repeat the uneven movement according to the flow of the hydraulic oil flowing into and out of the first hydraulic oil chamber 154p. The first suction / discharge chamber 154w sucks and discharges slurry according to the movement of the rubber film positioned between the first intermediate chamber 154m.

  The second pump chamber 155 includes a second hydraulic oil chamber 155p, a second intermediate chamber 155m, and a second suction chamber 155w. In the second hydraulic oil chamber 155p, hydraulic oil flows in and out in accordance with the movement of the metering cylinder 158. The second intermediate chamber 155m contains a liquid mixed with antifreeze and is adjacent to the second hydraulic oil chamber 155p and the second suction / discharge chamber 155w via a rubber film. The rubber films positioned at both ends of the second intermediate chamber 155m repeat the uneven motion according to the flow of hydraulic oil flowing into and out of the second hydraulic fluid chamber 155p. The second suction / discharge chamber 155w sucks and discharges slurry in accordance with the movement of the rubber film positioned between the second intermediate chamber 155m.

  When the first intake valve 157a is in operation, the first intake valve 157a is controlled to open and close by a double-acting pressure oil cylinder. The first suction valve 157a is opened when slurry is sucked into the first suction chamber 154w of the first pump chamber 154, and when the slurry is discharged from the first suction chamber 154w of the first pump chamber 154. It will be closed.

  When the first discharge valve 157b is in operation, the first discharge valve 157b is controlled to open and close by a double-acting pressure oil cylinder. The first discharge valve 157b is closed when slurry is sucked into the first suction chamber 154w of the first pump chamber 154, and when the slurry is discharged from the first suction chamber 154w of the first pump chamber 154. Will be open.

  When the second intake valve 157c is in operation, the second intake valve 157c is controlled to open and close by a double-acting pressure oil cylinder. The second suction valve 157c is opened when the slurry is sucked into the second suction chamber 155w of the second pump chamber 155, and when the slurry is discharged from the second suction chamber 155w of the second pump chamber 155. Closed.

  When the second discharge valve 157d is in operation, the second discharge valve 157d is controlled to open and close by a double-acting pressure oil cylinder. The second discharge valve 157d is closed when slurry is sucked into the second suction chamber 155w of the second pump chamber 155, and when the slurry is discharged from the second suction chamber 155w of the second pump chamber 155. Will be open.

  The fixed amount cylinder 158 has a drive shaft coupled to the drive cylinder 159 and a partition wall coupled to the drive shaft. The metering cylinder 158 alternately causes the hydraulic oil to flow into and out of the first hydraulic oil chamber 154p of the first pump chamber 154 and the second hydraulic oil chamber 155p of the second pump chamber 155 according to the movement of the drive shaft.

  The drive cylinder 159 has a drive shaft coupled to the metering cylinder 158 and a partition wall coupled to the drive shaft. The drive cylinder 159 moves the drive shaft in the left-right direction according to the pressure oil supplied from the pressure oil device 153 via the pressure oil pipes 301 and 302.

  When the high pressure pump 151 is stopped, the first suction valve 157a, the first discharge valve 157b, the second suction valve 157c, and the second discharge valve 157d are all opened, and the slurry transferred from the low pressure pump 143 is discharged. It transfers to the high-pressure filter press type dehydrator 1 without pressurizing.

  When operating, the high-pressure pump 151 pressurizes and transfers the slurry with hydraulic oil inside the first pump chamber 154 and the second pump chamber 155. Since the pressure is applied inside the first pump chamber 154 and the second pump chamber 155, the slurry can be transferred at a high discharge pressure by operating the high-pressure pump 151. However, since the discharge amount of the high-pressure pump 151 depends on the capacities of the first suction chamber 154w and the second suction chamber 155w, it is smaller than the discharge amount of the low-pressure pump 143. When the high-pressure pump 151 is in operation, the slurry that is discharged from the low-pressure pump 143 but is not sucked into the high-pressure pump 151 returns to the slurry tank 142 via a return valve (not shown).

  The high-pressure filter press-type dehydrating apparatus 1 includes a plurality of filter frames 10, a filter frame driving unit 102, and a pressure gauge 103. Each of the plurality of filter frames 10 forms a plurality of filter chambers between adjacent filter frames 10. The filter frame driving unit 102 is controlled to move the plurality of filter frames 10 in the axial direction orthogonal to the filter frame 10 by the pressure oil supplied from the pressure oil device 153 via the pressure oil pipes 303 and 304. When pressure oil is press-fitted into the filter frame driving unit 102, the plurality of filter frames 10 are arranged in close contact with each other, and a plurality of filter chambers are formed between adjacent filter frames 10. When the pressure oil is discharged from the filter frame driving unit 102, the plurality of filter frames 10 are arranged at predetermined intervals. The pressure gauge 103 is a diaphragm pressure gauge, detects the pressure inside the filter chamber, and determines whether or not the dehydration process is completed based on the detected filter chamber pressure.

  The drainage tank 152 is a water tank that stores filtrate generated by the dehydration process in the filtration chamber of the high-pressure filter press-type dehydrator 1, and the filtrate stored by a pump (not shown) is supplied to the purification device 161 of the water treatment unit 160. Transport.

  The pressure oil device 153 includes a pressure oil tank that stores hydraulic oil, a pressure oil pump that applies a predetermined pressure to the hydraulic oil inside the pressure oil tank and discharges it as pressure oil, and a pressure oil discharged from the pressure oil pump. And a direction switching valve for selecting the direction of delivery. The pressure oil device 153 drives the high pressure pump 151 and the high pressure filter press dehydrator 1 by supplying pressurized hydraulic oil to the high pressure pump 151 and the high pressure filter press dehydrator 1, respectively.

  The water treatment unit 160 includes a purification device 161, a discharge water tank 162, a purification agent injection device 163, and a neutralization device 164. The purification device 161 purifies the filtrate by mixing the filtrate transferred from the drainage tank 152, the PAC injected from the PAC tank, and the purification agent injected from the purification agent injection apparatus. The discharge water tank 162 discharges the filtrate purified by the purification device after adjusting the pH with a neutralizing agent injected from the neutralization device.

  FIG. 4 is a perspective view of the filter frame 10, and FIG. 5 is an exploded perspective view of the filter frame 10. 6A is a front view seen from the direction of arrow A in FIG. 4, FIG. 6B is a rear view seen from the direction of arrow B in FIG. 4, and FIG. 7A is the direction of arrow C in FIG. FIG. 7B is a plan view seen from the direction of arrow D in FIG. 4.

  The filter frame 10 includes a core plate member 14, a pair of frame members 15 a and 15 b, a pair of draining members 16 a and 16 b, and a support member 19.

  The core plate member 14 is made of iron, and has a pair of rectangular flat plate portions 14a and a pair of grip portions 17a and 17b disposed at substantially central portions of both side surfaces. The flat plate portion 14a of the core plate member 14 has a size of height 1820 mm × width 1700 mm. A hole 14b through which slurry passes is formed at the center of the flat plate portion 14a of the core plate member 14. Further, a plurality of reinforcing members 18 are disposed on the flat plate portion 14 a of the core plate member 14. Each of the plurality of reinforcing members 18 is made of iron and prevents the core plate member 14 from being bent when pressure is applied to the filter chamber. The pair of grip portions 17a and 17b are respectively supported at the lower end portions by the support portion of the high-pressure filter press dehydrator 1.

  Each of the pair of frame members 15a and 15b is a rectangular window frame-shaped member made of iron and having a height of 11.5 mm. The pair of frame members 15 a and 15 b are arranged along the end portions of the flat plate portion 14 a of the core plate member 14. A plurality of drainage grooves 15c through which drainage is discharged are formed on the lower sides of the pair of frame members 15a and 15b, respectively. The total height of the height of the frame member 15a and the height of the frame member 15b corresponds to the width of the filter chamber formed by arranging the filter frames 10 close to each other. That is, if the thickness of the filter cloth disposed on the flat plate portion 14a of the core plate member 14 is ignored, the width of the filter chamber is 23 mm.

  Each of the pair of draining members 16a and 16b is a flat plate member having a rectangular shape made of iron and having holes 16c and 16d through which slurry passes in the center. The pair of draining members 16a and 16b are arranged in the frames of the frame members 15a and 15b so as to be in contact with the flat plate portion 14a of the core plate member 14, respectively. Each of the pair of draining members 16a and 16b has a mesh structure, and moves the drained water discharged from the filter chamber through the filter cloth downward. The outer surface of each of the pair of draining members 16a and 16b is a filtration surface for filtering the slurry.

  The support member 19 is made of iron and has a cylindrical shape. The support member 19 supports the filter frame 10 together with the pair of handle portions 17a and 17b. The support member 19 is coupled to the core plate member 14 by a coupling member (not shown).

  The first filter cloth 11a and the second filter cloth 11b are fixed to both flat plate portions 14a of the filter frame 10 by a fixing member 11d.

  8A is a cross-sectional view taken along the line AA ′ of the first filter cloth 11a, FIG. 8B is a cross-sectional view taken along the line BB ′ of the first filter cloth 11a, and FIG. It is CC 'sectional drawing of the 2nd filter cloth 11b, FIG.8 (d) is DD' sectional drawing of the 2nd filter cloth 11b. FIG. 8E is an EE ′ sectional view of the first filter cloth 11a, FIG. 8F is an FF ′ sectional view of the first filter cloth 11a, and FIG. It is GG 'sectional drawing of the 2nd filter cloth 11b, FIG.8 (h) is HH' sectional drawing of the 2nd filter cloth 11b.

  Each of the first filter cloth 11a and the second filter cloth 11b has a square shape woven with nylon. The first filter cloth 11a and the second filter cloth 11b are joined to each other by a fastener 11e on one side. In the first filter cloth 11a and the second filter cloth 11b, the reinforcing cloths 11c are respectively arranged at portions where the plurality of reinforcing members 18 hit.

  A plurality of first linear members 12a and a plurality of second linear members 12b are arranged on the surface of the first filter cloth 11a opposite to the surface in contact with the filter frame 10. The plurality of first linear members 12a and the plurality of second linear members 12b are respectively stored in first and second storage portions formed on the surface of the first filter cloth 11a. The first and second storage portions are formed by sewing the same members as the first filter cloth 11a so as to store the plurality of first linear members 12a and the plurality of second linear members 12b, respectively. Is done. The width of the first storage part for storing the first linear member 12a is 50 mm, and the width of the second storage part for storing the second linear member 12b is 30 mm.

  The plurality of first linear members 12a are cylindrical members made of aluminum and having a diameter of 16 mm, and are arranged in parallel to each other in the vertical direction. The plurality of first linear members 12a arranged in parallel are arranged for each first distance in the longitudinal direction. The plurality of first linear members 12a are not disposed in the region where the reinforcing cloth 11c is disposed. Since the region where the reinforcing cloth 11c is disposed is a region where the reinforcing member 18 may come into contact, the first linear member 12a and the reinforcing member 18 come into contact with each other, and the first linear member 12a is deformed. This is to prevent this. Each of the plurality of second linear members 12b is a cylindrical member made of acrylic rubber and having a diameter of 7.5 mm, and is arranged in parallel to each other in the horizontal direction, that is, the direction orthogonal to the first linear member 12a. The plurality of second linear members 12b arranged in parallel are arranged for each second distance in the longitudinal direction. The plurality of second linear members 12b are also disposed in the region where the reinforcing cloth 11c is disposed. This is because the second linear member 12b is an elastic body and does not possibly deform even if it comes into contact with the reinforcing member 18. The diameter of the second linear member 12b is smaller than the diameter of the first linear member 12a because the groove formed corresponding to the shape of the second linear member 12b formed in the horizontal direction is This is because peeling is easier than a groove formed corresponding to the shape of the first linear member 12a formed in the vertical direction.

  The total length of the diameter of the first linear member 12a and the diameter of the second linear member 12b is 23.5 mm, which is larger than the width of the filter chamber, which is 23 mm. For this reason, the dewatering cake 403 is not formed in the place where the 1st linear member 12a and the 2nd linear member 12b cross.

  A plurality of third linear members 13a and a plurality of fourth linear members 13b are arranged on the surface of the second filter cloth 11b opposite to the surface in contact with the filter frame 10. The plurality of third linear members 13a and the plurality of fourth linear members 13b are respectively stored in third and fourth storage portions formed on the surface of the second filter cloth 11b. The third and fourth storage portions are formed by sewing the same members as the second filter cloth 11b so as to store the plurality of third linear members 13a and the plurality of fourth linear members 13b, respectively. Is done. The width | variety of the 3rd accommodating part which accommodates the 3rd linear member 13a is 50 mm, and the width | variety of the 4th accommodating part which accommodates the 4th linear member 13b is 30 mm.

  Each of the plurality of third linear members 13a is a cylindrical member made of aluminum and having a diameter of 16 mm, and is arranged in parallel to each other in the vertical direction. The plurality of third linear members 13a arranged in parallel are arranged for each first distance in the longitudinal direction, like the first linear member 12a. The plurality of third linear members 13a are not disposed in the region where the reinforcing cloth 11c is disposed. Since the region where the reinforcing cloth 11c is disposed is a region where the reinforcing member 18 may come into contact, the third linear member 13a and the reinforcing member 18 come into contact with each other, and the third linear member 13a is deformed. This is to prevent damage. Each of the plurality of fourth linear members 13b is a cylindrical member made of acrylic rubber and having a diameter of 7.5 mm, and is arranged in parallel to each other in the horizontal direction, that is, the direction orthogonal to the third linear member 13a. The plurality of fourth linear members 13b arranged in parallel are arranged for each second distance in the longitudinal direction, similarly to the second linear member 12b. The plurality of fourth linear members 13b are also disposed in the region where the reinforcing cloth 11c is disposed. This is because the fourth linear member 13b is an elastic body and is not damaged even if it comes into contact with the reinforcing member 18. However, the 4th linear member 13b is not arrange | positioned in the area | region with high possibility of contacting with the reinforcement member 18, such as the center part of the reinforcement cloth 11c. The diameter of the fourth linear member 13b is smaller than the diameter of the third linear member 13a because the groove formed corresponding to the shape of the fourth linear member 13b formed in the horizontal direction is This is because peeling is easier than a groove formed corresponding to the shape of the third linear member 13a formed in the vertical direction.

  The total length of the diameter of the third linear member 13a and the diameter of the fourth linear member 13b is 23.5 mm, which is larger than the width of the filter chamber, which is 23 mm. For this reason, the dewatering cake 403 is not formed in the place where the 3rd linear member 13a and the 4th linear member 13b cross.

  FIG. 9 is a diagram showing a dehydration process of the high-pressure filter press dehydrator 1. FIG. 9A shows a preparation process, FIG. 9B shows a filtration process, FIG. 9C shows a residual liquid treatment process, and FIG. 9D shows a frame opening process.

  First, in the preparatory process shown in FIG. 9 (a), the high pressure filter press-type dewatering device 1 is configured such that pressure oil is press-fitted into the filter frame driving unit 102, and a plurality of filter frames 10 are arranged close to each other. A chamber is formed. A first filter cloth 11a and a second filter cloth 11b are disposed on the filter surfaces of the plurality of filter frames 10, respectively. Moreover, the linear members 12 and 13 are each arrange | positioned at the filter cloth at the grid | lattice form. The linear members 12 and 13 are arranged on the opposing filtration surfaces and are arranged alternately, i.e., in a staggered manner. Since the 1st filter cloth 11a and the 2nd filter cloth 11b are each arrange | positioned at the filtration surface of the some filter frame 10, the filter chamber formed when the filter frame 10 adjoins is arrange | positioned in an end surface. The filter cloth is sandwiched.

  Next, in the filtration step shown in FIG. 9B, in the high-pressure filter press-type dehydrator 1, the slurry 401 is press-fitted into the filter chamber from the low-pressure pump 143 and the high-pressure pump 151. The water in the slurry press-fitted into the filter chamber is discharged as filtered water 402 to the outside of the filter frame 10 from the filter channel formed inside the filter frame 10 through the first filter cloth 11a and the second filter cloth 11b. The A dewatered cake 403 is gradually formed from the dewatered slurry inside the filter frame. The filtrate 402 discharged to the outside of the filter frame 10 is stored in the filtrate tank 152. The filtrate 402 stored in the filtrate tank 152 is transferred to the purification device 161 of the water treatment unit 160 by a pump (not shown). The filtration process is continued until the pressure inside the filtration chamber of the high-pressure filter press dehydrator 1 reaches 4 [MPa]. In the dehydration processing system 100, the slurry is pressed into the filter chamber of the high-pressure filter press-type dehydrator 1 by the high-pressure pump 151 having a high discharge pressure. The pressure can be increased to [MPa]. By producing the dewatered cake 403 at a high pressure, the volume of dredged soil can be greatly reduced.

  In addition, lattice-shaped grooves corresponding to the shapes of the linear members 12 and 13 are formed on both surfaces of the dewatering cake 403, respectively. A lattice-like groove corresponding to the shape of the linear member 12 is formed on one surface of the dehydrated cake 403. A lattice-like groove corresponding to the shape of the linear member 13 is formed on the other surface of the dewatering cake 403. The lattice-shaped grooves formed on one surface of the dehydrated cake 403 and the lattice-shaped grooves formed on the other surface of the dehydrated cake 403 are alternately arranged.

  Next, in the residual liquid treatment step shown in FIG. 9C, the high-pressure filter press-type dehydrator 1 is configured such that after the low-pressure pump 143 and the high-pressure pump 151 are stopped, the residual liquid of the injected slurry 401 is blown from the filter frame to the air blow 404. Discharged by. When the residual liquid of the slurry 401 is discharged from the filter chamber, the dehydrated cake 403, which is a solid substance, remains inside the filter frame while being sandwiched between the inner side surfaces of the filter chamber.

  9 (d), the high pressure filter press-type dehydrator 1 discharges the pressure oil from the filter frame drive unit 102, and the plurality of filter frames 10 are arranged at predetermined intervals. The When the plurality of filter frames 10 are arranged at predetermined intervals, the dehydrated cake 403 sandwiched between the pair of filter frames 10 falls downward. When falling, since the linear members 12 and 13 are arranged in a staggered manner, the dewatering cake 403 has a moment that can be broken by a groove corresponding to the linear members 12 and 13. When the dewatered cake 403 falls to the ground surface, it is crushed into small pieces having a regular shape along the grooves corresponding to the linear members 12 and 13.

  FIG. 10A is a side view of the dehydrated cake 403, and FIG. 10B is a plan view of the dehydrated cake 403. In FIG. 10A, a white arrow indicates a direction in which a filter frame (not shown) that has sandwiched the dehydrated cake 403 moves. In FIG. 10A, an arrow indicates a moment generated in the dehydrated cake 403 when a filter frame (not shown) moves.

  On one surface of the dewatering cake 403, recesses 431 and 433 are formed by a plurality of first linear members 12a and a plurality of second linear members 12b. Further, on the other surface of the dewatering cake 403, recesses 432 and 434 are formed by the plurality of third linear members 13a and the plurality of fourth linear members 13b.

  When the dehydrated cake 403 is peeled from the filter frame 10, the portions of the dehydrated cake 403 that are in contact with the first to fourth linear members 12a, 12b, 13a, and 13b are the first filter cloth 11a and the second filter. It is harder to peel off than the part in contact with the cloth 11b. For this reason, the part which contact | connects the 1st-4th linear members 12a, 12b, 13a, and 13b of the dewatering cake 403 is behind the part which contact | connects the 1st filter cloth 11a and the 2nd filter cloth 11b. And peel off. The portion of the dehydrated cake 403 that is in contact with the first to fourth linear members 12a, 12b, 13a, and 13b is peeled off later than the portion that is in contact with the first filter cloth 11a and the second filter cloth 11b. As a result, a moment is generated in the dehydrated cake 403 in the direction indicated by the arrow. The moment indicated by the arrow acts as a force for dividing the dehydrated cake from the recesses 431 to 434 in the width direction of the dehydrated cake 403. Since the first to fourth linear members 12a, 12b, 13a and 13b are arranged in a staggered manner, the moments generated in the directions indicated by the arrows act as forces for dividing the dewatered cake 403 without canceling each other.

  FIG. 11 is an exploded perspective view of another example of the filter frame.

  The filter frame 20 includes a plurality of first to fourth linear members 12a, 12b, 13a, a core plate member 14, a pair of frame members 15a and 15b, a pair of draining members 16a and 16b, and a support member 19. 13b is different from the filter frame 10 shown in FIGS.

  The plurality of first linear members 12a are arranged in parallel to each other in the vertical direction on a surface opposite to the surface in contact with the core plate member 14 of the draining member 16a. The plurality of second linear members 12b are arranged on the surface opposite to the surface in contact with the core plate member 14 of the draining member 16a in parallel with each other in the horizontal direction, that is, the direction orthogonal to the first linear member 12a. The plurality of third linear members 13a are arranged in parallel to each other in the vertical direction on a surface opposite to the surface in contact with the core plate member 14 of the draining member 16b. The plurality of fourth linear members 13b are arranged on the surface opposite to the surface in contact with the core plate member 14 of the draining member 16b in parallel with each other in the horizontal direction, that is, the direction orthogonal to the third linear member 13a. The plurality of first to fourth linear members 12a, 12b, 13a, and 13b are joined to the draining member 16a or 16b by a joining member (not shown).

  When arranging the filter frame 20 in the high-pressure filter press-type dehydrator 1, a filter cloth having no first to fourth storage portions is used.

  FIG. 12A is a front view of still another example of the filter frame, and FIG. 12B is a rear view of still another example of the filter frame.

  In the filter frame 10 shown in FIGS. 12 (a) and 12 (b), the first filter cloth 31a and the second filter cloth 31b are fixed instead of the first filter cloth 11a and the second filter cloth 11b. This is different from the filter frame 10 shown in FIGS.

  The first filter cloth 31a is different from the first filter cloth 11a shown in FIGS. 4 to 8 in that the first linear member 12a and the third linear member 13a are arranged not in the vertical direction but inclined. . In addition, the second filter cloth 31b includes the second filter cloth 11b shown in FIGS. 4 to 8 that the second linear member 12b and the fourth linear member 13b are arranged not in the horizontal direction but inclined. Is different.

  The first linear member 12a arranged on the first filter cloth 31a and the third linear member 13a arranged on the second filter cloth 31b are arranged so as to be parallel to each other at the same interval. . In addition, the second linear member 12b arranged on the first filter cloth 31a and the fourth linear member 13b arranged on the second filter cloth 31b are arranged so as to be parallel to each other at the same interval. Is done.

  The dehydration processing system, the high-pressure filter press-type dehydrator, the filter frame, and the filter cloth have been described above with reference to FIGS. Although the present invention has been described with reference to a dehydration processing system 150 including a high pressure pump 151 and a high pressure filter press dehydrator 1, the present invention is used in a filter press dehydrator that does not have a high pressure pump. You can also.

  The total length of the diameters of the first linear member 12a and the second linear member 12b and the total length of the diameters of the third linear member 13a and the fourth linear member 13b are the width of the filter chamber. However, it may be the same length as the width of the filter chamber or may be shorter than the width of the filter chamber.

  Moreover, although the 1st linear member 12a and the 3rd linear member 13a have a cylindrical shape, you may have shapes, such as a triangular prism and a quadratic prism. Moreover, although the 2nd linear member 12b and the 4th linear member 13b have a cylindrical shape, you may have shapes, such as a triangular prism and a quadratic prism.

  Moreover, although the 1st linear member 12a and the 3rd linear member 13a are formed with aluminum, they may be formed with another metal material, and may be formed with other materials, such as an elastic material. Moreover, although the 2nd linear member 12b and the 4th linear member 13b are formed with an acrylic rubber, they may be formed with another elastic material, and may be formed with other materials, such as aluminum.

  In addition, the first linear member 12a and the third linear member 13a are not arranged in the region where the reinforcing cloth 11c is arranged, but the first linear member 12a and the third linear member 13a are made of the reinforcing cloth 11c. You may arrange | position in the area | regions where the reinforcing member 18 does not contact, such as an edge part.

  Moreover, although the 1st linear member 12a and the 2nd linear member 12b are orthogonal, it does not need to be orthogonal. Moreover, although the 3rd linear member 13a and the 4th linear member 13b are orthogonal, they do not need to be orthogonal. However, the first linear member 12a and the third linear member 13a are arranged in parallel, and the second linear member 12b and the fourth linear member 13b are arranged in parallel. Moreover, the space | interval between the 1st linear members 12a is arrange | positioned at the space | interval same as the space | interval between the 3rd linear members 13a, and the space | interval between the 2nd linear members 12b is the 4th linear member 13b. It is arranged at the same interval as the interval between.

  Moreover, although the 1st linear member 12a and the 2nd linear member 12b are arrange | positioned inside the 1st and storage part formed in the 1st filter cloth 11a, the 1st linear member 12a and the 2nd line The shaped member 12b may be bonded to the first filter cloth 11a with an adhesive. Moreover, the 1st linear member 12a and the 2nd linear member 12b may be sewn on the 1st filter cloth 11a. Moreover, although the 3rd linear member 13a and the 4th linear member 13b are arrange | positioned inside the 3rd and 4th accommodating part formed in the 2nd filter cloth 11b, the 3rd linear member 13a and the 4th The linear member 13b may be bonded to the second filter cloth 11b with an adhesive. Moreover, the 3rd linear member 13a and the 4th linear member 13b may be sewn on the 2nd filter cloth 11b.

  The first filter cloth 11a and the second filter cloth 11b are joined to each other by a fastener 11e and fixed to a single filter frame 10 by a fixing member 11d. However, a pair of filter cloth sets is formed by the first filter cloth 11a arranged on the filtration surface of the first filter frame and the second filter cloth 11b arranged on the opposite filtration surface of the second filter frame. It may be formed.

  In addition, the first filter cloth 11a is disposed on one filtration surface of the filter frame 10, and the second filter cloth 11b is disposed on the other filtration surface of the same filter frame 10. The filter frames in which the first filter cloth 11a and the second filter cloth 11b are respectively arranged may be alternately arranged.

  Further, in the dehydration processing system 100, in the reaction tank 141, the muddy water is stirred together with PAC and slaked lime to produce a slurry. Good. By adding a curing agent to the slurry, the hardness of the dewatered cake produced by the dewatering system 100 can be increased.

DESCRIPTION OF SYMBOLS 1 High pressure filter press type dehydrator 10, 20 Filter frame 11a, 31a 1st filter cloth 11b, 31b 2nd filter cloth 12a 1st linear member 12b 2nd linear member 13a 3rd linear member 13b 4th line Shaped member 100 Dehydration treatment system

Claims (4)

A first filter frame and a second filter frame in which the filtration surfaces for filtering the slurry are opposed to each other;
A first filter cloth disposed on a filtration surface of the first filter frame;
A second filter cloth disposed on the filtration surface of the second filter frame;
A first linear member disposed on the filtration surface of the first filter frame in parallel with each other in the first direction for each first distance;
A second linear member arranged on the filtration surface of the first filter frame in parallel with each other in a second direction different from the first direction for each second distance;
A third linear member disposed on the filtration surface of the second filter frame in parallel with each other in the first direction for each first distance;
A fourth linear member arranged on the filtration surface of the second filter frame in parallel with each other in the second direction for each second distance;
The first filter cloth is sewn to the filter surface of the first filter cloth and accommodates the first linear member, and is sewn to the filter surface of the first filter cloth and the first filter cloth. A second storage portion for storing the second linear member;
The second filter cloth is sewn to the filter surface of the second filter cloth and accommodates the third linear member, is sewn to the filter surface of the second filter cloth, and A fourth storage portion for storing the fourth linear member;
The first storage part and the second storage part are formed of the same member as the first filter cloth, and the third storage part and the fourth storage part are the same member as the second filter cloth. A filter press-type dewatering device formed by 2. The filter press-type dewatering device according to claim 1 , wherein the first linear member and the third linear member are formed of a metal material, and the second linear member and the fourth linear member are formed of an elastic material. . The total height of the first linear member and the second linear member is a filter formed by arranging the first filter frame and the second filter frame close to each other. Equal to the width of the chamber or larger than the width of the filter chamber,
Total height of the height of the height and the fourth linear members of the third linear member, the width and identically or of the filter chamber, or greater than the width of the filter chamber, to claim 2 The filter press-type dehydrator as described. A first filter cloth disposed on the filter surface of the first filter frame, stitched to the filter surface of the first filter cloth, and aligned in parallel with each other in a first direction at each first distance. A first storage portion that stores the first linear member to be disposed, and a first sewing portion that is sewn to the filter surface of the first filter cloth and parallel to each other in a second direction different from the first direction at every second distance. A first filter cloth having a second storage part for storing the second linear members arranged side by side,
A second filter cloth disposed on the filter surface of the second filter frame opposite to the filter surface of the first filter frame, stitched to the filter surface of the second filter cloth, and the first distance; A third storage portion for storing third linear members arranged in parallel with each other in the first direction, and stitched to the filter surface of the second filter cloth and for each second distance A second filter cloth having a fourth storage portion for storing a fourth linear member arranged in parallel with each other in the second direction;
The first storage part and the second storage part are formed of the same member as the first filter cloth, and the third storage part and the fourth storage part are the second filter cloth. The filter cloth set characterized by being formed with the same member .

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