JP6164809B2 - Muddy water treatment method and muddy water treatment system - Google Patents

Description

  The present invention relates to a muddy water treatment method and a muddy water treatment system for treating muddy water in a pollution prevention frame.

  Conventionally, when dredging work is carried out, in order to prevent the surrounding water area from being polluted by the pollution caused by dredging work, a pollution prevention frame is installed to surround the dredging site so that the pollution caused by dredging work is introduced into the surrounding water area. It spreads and waits for the turbid water in the pollution control frame to settle down, and the next part is dredged.

  Patent Document 1 encloses the dredged area with a water-impervious pollution prevention frame, pumps the contaminated water inside the pollution prevention frame with a pump, filters it, discharges it outside the pollution prevention frame, and discharges non-polluted water outside the pollution prevention frame. Disclosed is a grab dredge method that excavates dredged water bottoms while being introduced into a pollution prevention frame.

  In Patent Document 2, turbid water is pumped up from the inside of the pollution prevention frame, and an inorganic flocculant is added to the turbid water as a first flocculant to produce a flocculent solution, and flocs of suspended particles are formed in the flocculent solution. In addition, a polymer flocculant is added as a second flocculant, and while the flocs of the suspended particles have an active flocculant effect, the flocs of the flocculant solution or suspended particles are removed from the pollution prevention frame. Disclosed is a turbidity diffusion prevention method in which suspended particles suspended in seawater in a pollution control frame are aggregated and settled by being poured into seawater.

Japanese Patent Laid-Open No. 7-229162 JP 2005-48465 A

  When the muddy water in the pollution prevention frame is treated and returned to the pollution prevention frame, the turbidity gradually decreases while the purified water mixes with the muddy water in the pollution prevention frame. Furthermore, if the turbid water having a reduced turbidity is repeatedly purified, it is necessary to perform a treatment for the volume in the pollution prevention frame, which is inefficient.

  Moreover, like the grab dredging method of Patent Document 1, the water treated by filtering the polluted water in the pollution prevention frame is discharged outside the pollution prevention frame, and the non-polluted water outside the pollution prevention frame is drained inside the pollution prevention frame while dripping. To reduce the turbidity in the pollution prevention frame, but if the amount of turbid water treatment cannot catch up, the pollution prevention frame will eventually become cloudy. Therefore, it takes time to reduce the turbidity in the pollution prevention frame, ineffective. In addition, the method of Patent Document 2 requires two types of flocculants.

  An object of this invention is to provide the muddy water processing method and muddy water processing system which can process efficiently the muddy water in the pollution prevention frame which became muddy with the soot in view of the problem of the prior art as mentioned above.

In order to achieve the above object, the turbid water treatment method according to the present embodiment surrounds a predetermined water area with a pollution prevention frame, and a partition wall that is movable by moving means is provided in the pollution prevention frame, and the partition wall includes Is divided into first and second compartments, the turbid water in the anti-pollution frame that has become turbid due to soot is treated, the turbid water before treatment is accommodated in the first compartment, and the second compartment The treated water is stored in the separation wall so that the turbid water before the treatment and the treated water are not mixed with each other by the partition wall , the treatment amount of the turbid water is measured, and the treatment amount of the turbid water is measured. Based on the result, the moving means is controlled, and the volume of the first compartment is reduced by automatically moving the partition wall by controlling the moving means according to the amount of turbid water treated , It is characterized by increasing the volume of the second compartment .

  According to this muddy water treatment method, the volume of the portion of the pollution prevention frame that contains the muddy water before treatment in the pollution prevention frame is reduced according to the amount of muddy water in the pollution prevention frame. It can be reduced according to the processing. For this reason, during the treatment of muddy water, it is not necessary to return the treated water to the pollution prevention frame in which muddy water is accommodated, and it is not necessary to introduce non-polluted water into the pollution prevention frame from the outside of the pollution prevention frame. Therefore, muddy water treatment within the pollution prevention frame can be performed efficiently.

In the muddy water treatment method, a movable partition wall is provided in the pollution prevention frame, the inside of the pollution prevention frame is divided into first and second compartments by the partition walls, and the first compartment has a pre-treatment space. The turbid water is accommodated, the treated water is accommodated in the second compartment, and the volume of the first compartment is reduced by moving the partition wall according to the treatment amount of the turbid water. volume of 2 compartments Ru increase. By separating the turbid water before treatment and the water after treatment by the partition wall in the pollution prevention frame, and reducing the volume of the first partition wall for storing the turbid water before treatment according to the amount of turbid water treated, The absolute amount of turbid water can be reduced.

The muddy water treatment system according to the present embodiment includes a pollution prevention frame that is installed in a predetermined water area and surrounds the water area, a muddy water treatment apparatus that treats muddy water in the pollution prevention frame, and a muddy water treatment amount by the muddy water treatment apparatus. And a volume reducing means for reducing the volume of the portion of the pollution control frame that contains the untreated turbid water, and the volume reduction means includes a partition wall movably provided in the pollution prevention frame, a moving means for moving the partition walls, and measuring means for measuring the throughput of the turbid water, and control means for controlling said moving means based on a measurement result by the measuring means, the pollution frame by said partition wall The interior is divided into first and second compartments, turbid water before treatment is contained in the first compartment, water after treatment is contained in the second compartment, and the partition wall Muddy water before treatment and water after treatment Be separated so that immiscible reduces the volume of the first compartment by the moving means under control of said control means in accordance with the processing amount of the turbid water to be moved automatically the partition wall, the The volume of the second compartment is increased .

  According to this muddy water treatment system, the volume of the portion containing muddy water before treatment in the pollution prevention frame is reduced according to the treatment amount of muddy water in the pollution prevention frame. It can be reduced according to the processing. For this reason, during the treatment of muddy water, it is not necessary to return the treated water to the pollution prevention frame in which muddy water is accommodated, and it is not necessary to introduce non-polluted water into the pollution prevention frame from the outside of the pollution prevention frame. Therefore, muddy water treatment within the pollution prevention frame can be performed efficiently.

In the turbid water treatment system, the volume reducing means includes a partition wall movably provided in the pollution prevention frame and a moving means for moving the partition wall. And the second compartment, the muddy water before the treatment is accommodated in the first compartment, the water after the treatment is accommodated in the second compartment, and depending on the amount of treatment of the muddy water. wherein by the moving means to reduce the volume of the first compartment by moving the partition wall, Ru increases the volume of the second compartment. By separating the turbid water before treatment and the water after treatment by the partition wall in the pollution prevention frame, and reducing the volume of the first partition wall for storing the turbid water before treatment according to the amount of turbid water treated, The absolute amount of turbid water can be reduced.

  According to the turbid water treatment method and the turbid water treatment system of the present invention, turbid water in a pollution prevention frame that is turbid due to soot can be efficiently treated.

It is a top view which shows roughly the muddy water processing system by this embodiment. It is the figure which looked at the muddy water processing system of FIG. 1 from the direction of arrow II. It is a principal part enlarged view which shows the vicinity of the winch of FIG. It is a principal part enlarged view which shows the vicinity of the partition and float of FIG. It is a block diagram which shows roughly the control system which controls the winch of FIG. 1, FIG. It is a flowchart for demonstrating the muddy water treatment process by the muddy water treatment system A of FIGS. It is a top view which shows roughly another example of the muddy water processing system by this embodiment. FIG. 8 is a view of the muddy water treatment system of FIG. 7 as viewed from the direction of arrow VIII.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a top view schematically showing a muddy water treatment system according to this embodiment. FIG. 2 is a view of the muddy water treatment system of FIG. 1 as viewed from the direction of arrow II (however, the position of the trolley is shifted for convenience of explanation).

  As shown in FIGS. 1 and 2, the muddy water treatment system A is placed on a trolley SH for treating muddy water in a pollution prevention frame 11 installed in a predetermined water area and surrounding the water area, and the muddy water in the pollution prevention frame 11. A muddy water treatment device 19 and a partition wall 20 provided so as to be movable in the pollution prevention frame 11 from the water surface to the vicinity of the bottom of the water are provided. The partition wall 20 is made of, for example, a rigid plate member such as a steel material or a plastic material, or a sheet material such as canvas or rubber or synthetic fiber capable of maintaining rigidity with reinforcement, and the upper part always floats on the water surface. To the float 31.

  The pollution prevention frame 11 includes a float 12 configured to float on a water surface from a flat rectangular frame, and a curtain-shaped water-impervious film 13 attached so as to hang from the bottom of the float 12 to the bottom of the water. By being installed so as to surround a predetermined water area, even if, for example, a dredging operation is performed in the pollution prevention frame 11 and pollution occurs, the turbid water does not diffuse to the outside.

  The turbid water treatment device 19 has various processing functions such as suction / discharge of water, sedimentation / separation of suspension, neutralization, and waste mud. The turbid water treatment device 19 is configured as a unit and sucks and processes turbid water from the pollution prevention frame 11. After purifying, treated water with low turbidity is discharged.

  The muddy water treatment system A has winches 21, 22, 23, 24 arranged at the four corners of the pollution prevention frame 11 and wires 32, 33 as moving means for moving the partition wall 20 arranged in the pollution prevention frame 11. And having. The winches 21 and 22 drive the wire 32 connected to the upper part of one end of the partition wall 20, and the winches 23 and 24 drive the wire 33 connected to the upper part of the other end of the partition wall 20, thereby Is moved in the horizontal direction of FIG.

  As shown in FIG. 1, flexible curtain-like water shielding films 25, 27 are connected to one end and the other end of the partition wall 20. The water shielding films 25 and 27 are configured with a sufficient length so that the partition wall 20 can move from end to end within the pollution prevention frame 11, and are connected to the joint portions 26 and 28 of the pollution prevention frame 11. Yes. Further, as shown in FIG. 2, a flexible curtain-shaped water shielding film 29 is connected to the lower end of the partition wall 20, so that the water shielding film 29 can move within the pollution prevention frame 11 of the partition wall 20. It has a sufficient length and is connected to a weight 30 installed at the bottom of the water.

  The partition wall 20 extends in the lateral direction within the pollution prevention frame 11 and divides the inside of the pollution prevention frame 11 into two parts to form a first compartment 14 and a second compartment 15. The compartment 14 and the compartment 15 are separated together with the flexible water shielding films 25, 27, 29 having a sufficient length. Thus, by providing the partition wall 20 in the pollution prevention frame 11, the muddy water before the treatment and the purified treated water can be separated.

  As shown in FIGS. 1 and 2, muddy water before treatment (high turbidity, muddy water to be treated) is accommodated in the first compartment 14, and treated water (low turbidity) is treated in the second compartment 15. Of water). The untreated turbid water in the first compartment 14 is sent to the turbid water treatment device 19 for treatment, and the treated water is discharged into the second compartment 15. For this reason, as the muddy water treatment by the muddy water treatment device 19 proceeds, the water before treatment in the first compartment 14 decreases and the water after treatment in the second compartment 15 increases. By moving the partition wall 20 in the direction of the arrow in FIGS. 1 and 2 according to the amount of muddy water before the treatment, the volume of the first compartment 14 is reduced and the volume of the second compartment 15 is increased. Control to do.

  As described above, the volume of the first compartment 14 for storing muddy water before treatment in the pollution prevention frame 11 is reduced by the movement of the partition wall 20 according to the amount of muddy water treated by the muddy water treatment device 19. The reducing means will be further described with reference to FIGS. FIG. 3 is an enlarged view of a main part showing the vicinity of the winch of FIG. FIG. 4 is an enlarged view of a main part showing the vicinity of the partition wall and the float of FIG. FIG. 5 is a block diagram schematically showing a control system for controlling the winch shown in FIGS.

  As shown in FIG. 3, a support member 21b made of shape steel is attached and fixed to the float 12 at the corner of the float 12, the wooden board 21c is arranged on the upper surface of the supporting member 21b, and the winch 21 is arranged and fixed on the wooden board 21c. To do. The wire 32 extends from the winch 21 to the partition wall 20, and the rotating drum 21 a of the winch 21 is rotationally driven to wind up the wire 32.

  As shown in FIG. 4, a reinforcing plate 31c attached to the partition wall 20 is fixed to the float 31 so as to sandwich the float 31, and a wire 32 from the winch 21 of FIGS. 1 to 3 is attached to the fixture 31a attached to the float 31. A wire 32 from the winch 22 shown in FIGS. 1 and 2 is connected to a fixture 31b attached to the partition wall 20 and connected thereto. Accordingly, the winch 21 winds the wire 32 and the winch 22 feeds the wire 32, whereby the partition wall 20 can be moved in the left direction in FIG. On the contrary, by controlling the winch 22 to wind up the wire 32, the partition wall 20 can be moved in the reverse direction (right direction in FIG. 2).

  As shown in FIG. 5, the muddy water treatment system A includes a control system that controls the winches 21 to 24 in FIGS. 1 to 3. The winches 21 to 24 are driven by the electric power from the generator 44, and the rotation speed is controlled by changing the frequency by the inverter 45. The control system in FIG. 5 includes a flow meter 41 that measures the suction flow rate of turbid water by the turbid water treatment device 19, and per unit time of turbid water before treatment in the first compartment 14 based on the flow rate measured by the flow meter 41. And the inverter 45 so as to control the rotational speed of the winches 21 to 24 on the basis of the calculated movement amount of the partition wall 20 based on the calculated movement amount of the partition wall 20. And a control device 43 for controlling. The movement of the partition wall 20 is controlled by controlling the rotation speed of the winches 21 to 24 by controlling the frequency of the inverter 45 according to the amount of muddy water treated by the muddy water treatment device 19.

  According to the control system of FIG. 5, the movement of the partition wall 20 can be controlled based on the amount of muddy water treated by the muddy water treatment device 19. By automatically moving the partition wall 20 in accordance with the amount of turbid water treated, the volume of the first compartment 14 that houses the untreated turbid water in the pollution prevention frame 11 can be reduced.

  Next, the muddy water treatment steps S01 to S08 by the muddy water treatment system A of FIGS. 1 to 5 will be described with reference to the flowchart of FIG.

  Dredging is performed in a predetermined water area (S01). This dredging operation is performed at the bottom of the water in the first compartment 14 of the pollution prevention frame 11 shown in FIGS. At this time, the partition wall 20 is positioned in the vicinity of the water-impervious film 13 at the left end in FIG. 2, and the volume of the second compartment 15 is considerably smaller than that of the first compartment 14.

  The water in the first compartment 14 of the pollution prevention frame 11 of FIGS. 1 and 2 becomes cloudy due to the dredging (S02). The muddy water in the first compartment 14 of the pollution prevention frame 11 is treated and purified by the muddy water treatment device 19 of the muddy water treatment system A (S03).

  The water purified by the muddy water treatment device 19 is returned to the second compartment 15 of the pollution prevention frame 11 shown in FIGS. 1 and 2 (S04). The turbid water before the treatment in the first compartment 14 decreases with the treatment of the turbid water, but the partition wall 20 is moved in accordance with the amount of turbid water treated (turbid water suction flow rate by the turbid water treatment device 19) (S05). .

  In the pollution prevention frame 11, the turbid water treatment device 19 purifies the turbid water in the first compartment 14 and returns it to the second compartment 15, thereby reducing the turbidity of the water in the second compartment 15. (S06).

  As described above, the volume of the first compartment 14 decreases simultaneously with the movement of the partition wall 20 in accordance with the decrease in muddy water before treatment, and the volume of the second compartment 15 increases simultaneously.

  The turbid water in the first compartment 14 is treated and purified, and the purified water is stored in the second compartment 15 to determine whether the turbidity of the water is below a predetermined reference value ( S <b> 07) If not below the reference value, the muddy water treatment device 19 treats and purifies the water in the second compartment 15 and returns it to the second compartment 15.

  If the turbidity of the water in the second compartment 15 is equal to or lower than the predetermined reference value, the purification of the turbid water is completed, and the carriage SH moves to the position for performing the next dredging together with the pollution prevention frame 11 (S08).

  As described above, according to the turbid water treatment by the turbid water treatment system A in FIGS. 1 to 5, the turbid water in the pollution prevention frame 11 is purified and returned to the pollution prevention frame 11. And the treated water are separated from each other by the partition wall 20 so as not to mix with the treated water, and the volume of the first compartment 14 is reduced as the muddy water before the treatment is reduced. The volume of the second compartment 15 increases. Thus, the turbid water before the treatment and the purified treated water do not mix, and it is only necessary to treat the turbid water in the first compartment 14, and according to the turbid water purification treatment, the first compartment Since the volume of 14 decreases and the absolute amount of turbid water to be processed decreases, the turbid water in the pollution prevention frame 11 can be efficiently purified. Further, it is not necessary to introduce non-polluted water into the pollution prevention frame 11 from the outside of the pollution prevention frame 11.

For example, the volume of the pollution prevention frame 11 is 4000 m ³ (20 m × 20 m × 10 m), and the purification capacity of the turbid water treatment device 19 (for example, the capacity to reduce the turbidity to 2 ppm or less when the turbidity is 200 ppm) is 400 m ³ / In terms of time, the time required to purify the amount of muddy water in the pollution prevention frame 11 is 10 hours. In contrast, according to the conventional method of purifying the turbid water in the pollution prevention frame and returning it to the same pollution prevention frame, the turbid water and the purified water are mixed, and the turbidity of the turbid water gradually decreases. However, the turbid water that has been mixed and lowered in turbidity is repeatedly purified, so that the absolute amount of water to be purified is very large and the purification time is prolonged. For this reason, the time required to purify the amount of turbid water in the pollution prevention frame exceeds 10 hours, which is considerably inefficient. According to the above-described conventional technique, only one dredging work can be performed per day, whereas according to the present embodiment, the dredging work can be performed twice a day and the dredging work can be efficiently performed. .

  Next, another example of the muddy water treatment system of FIGS. 1 and 2 will be described with reference to FIGS. FIG. 7 is a top view schematically showing another example of the muddy water treatment system according to the present embodiment. FIG. 8 is a view of the muddy water treatment system of FIG. 7 as viewed from the direction of arrow VIII (however, the position of the trolley is shifted for convenience of explanation).

  In the muddy water treatment system of FIGS. 7 and 8, the partition wall 20 is composed of a float 31a and a flexible curtain-shaped water shielding film 20a suspended from the float 31a. 1 and FIG. 2 except for these points.

  For example, the float 31a of the partition wall 20 has a pair of attachments similar to the attachments 31a of FIG. 4 and connects the wires 32 to these attachments. By controlling the winches 21 and 22 by the same control system as in FIG. 5, the movement of the partition wall 20 can be controlled based on the amount of muddy water treated by the muddy water treatment device 19. By automatically moving the partition wall 20 in accordance with the amount of turbid water treated, the volume of the first compartment 14 that houses the untreated turbid water is reduced.

  As described above, the modes for carrying out the present invention have been described. However, the present invention is not limited to these, and various modifications can be made within the scope of the technical idea of the present invention. For example, the partition 20 has been described as being separately provided in the pollution prevention frame. However, the partition 20 may be configured to move a part of the partition that constitutes the pollution prevention frame so as to reduce the volume of the portion that stores muddy water before treatment. In this case, the turbid water is purified until the turbidity is equal to or lower than a predetermined reference value, and then discharged to the outside of the pollution prevention frame.

  Further, in the present embodiment, as the moving means for moving the partition wall, the winch is configured to move the partition wall by driving the wire connected to the partition wall. However, the present invention is not limited to this, and for example, pollution prevention It is composed of a track provided at the top of the frame, a pulley provided extending from the end of the partition, and a winch that drives the pulley with a wire, and the partition is moved while the pulley is moved on the track by the winch. Also good.

DESCRIPTION OF SYMBOLS 11 Pollution prevention frame 12 Float 13 Water shielding film 14 First compartment 15 Second compartment 19 Turbid water treatment device 20 Partition 20a Water shielding films 21, 22, 23, 24 Winch (moving means)
31 Float 31a Float 32, 33 Wire (moving means)
41 Flowmeter A Turbid water treatment system SH

Claims (2)

Enclose specified water area with pollution prevention frame,
A partition wall movable by a moving means is provided in the pollution prevention frame, and the inside of the pollution prevention frame is divided into first and second compartments by the partition wall,
Treat turbid water in the pollution prevention frame that is cloudy by drought,
The turbid water before the treatment is accommodated in the first compartment, the water after the treatment is accommodated in the second compartment, and the turbid water before the treatment and the water after the treatment are mixed by the partition. Not to be separated,
Measure the amount of turbid water treated,
Controlling the moving means based on the measurement result of the treatment amount of the turbid water,
The volume of the first compartment is decreased and the volume of the second compartment is increased by automatically moving the partition by controlling the moving means according to the amount of turbid water treated. A muddy water treatment method characterized by the above. A pollution control frame installed in a predetermined water area and surrounding the water area;
A muddy water treatment device for treating muddy water in the pollution prevention frame;
A volume reducing means for reducing the volume of the portion of the pollution control frame that accommodates the turbid water before treatment in accordance with the amount of turbid water treated by the turbid water treatment device,
The volume reducing means is based on a partition wall movably provided in the pollution prevention frame, a moving means for moving the partition wall, a measuring means for measuring a treatment amount of the turbid water, and a measurement result by the measuring means. Control means for controlling the moving means,
The partition wall is divided into first and second compartments by the partition wall,
The turbid water before the treatment is accommodated in the first compartment, the water after the treatment is accommodated in the second compartment, and the turbid water before the treatment and the water after the treatment are mixed by the partition. Not to be separated,
The moving means automatically moves the partition wall under the control of the control means according to the treatment amount of the turbid water, thereby reducing the volume of the first compartment and increasing the volume of the second compartment. turbid water treatment system characterized in that it makes.

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