JP6819261B2 - Anaerobic processing equipment - Google Patents

Description

The present disclosure relates to an anaerobic treatment apparatus that treats an object to be treated by an anaerobic organism.

Conventionally, anaerobic treatment devices have been used for sewage treatment, urine treatment, treatment of industrial wastewater generated in the manufacturing process of beverages and foods, and the like. The anaerobic treatment apparatus is composed of, for example, a reaction tank containing an anaerobic organism layer composed of anaerobic organisms, and a liquid to be treated (wastewater) is introduced and introduced from below the anaerobic organism layer. The liquid to be treated overflows from the upper part of the reaction vessel to the outside through the anaerobic biological layer. Since the object to be treated in the liquid to be treated is decomposed by anaerobic organisms, the object to be treated is removed from the liquid to be treated when the liquid to be treated passes through the anaerobic organism layer.

In an anaerobic treatment apparatus, when an object to be treated is decomposed by an anaerobic organism, gases such as methane, nitrogen and carbon dioxide may be generated. In this case, the gas adheres to the anaerobic organism, and the anaerobic organism rises along with the gas along with the flow of the liquid to be treated and flows out from the upper part of the reaction tank to the outside.

Therefore, an anaerobic treatment device including a rotating shaft and a stirring device having stirring blades provided on the rotating shaft has been developed (for example, Patent Document 1). In the technique of Patent Document 1, a stirring blade is located in the anaerobic biological layer in the reaction vessel, and an air-solid-liquid separation plate is provided above the anaerobic biological layer and the stirring blade, and the stirring blade is rotated to make the stirring blade anaerobic. The gas desorbed from the organism is collected below the gas-solid-liquid separation plate.

Japanese Unexamined Patent Publication No. 2012-35194

However, in the technique of Patent Document 1, the stirring device cannot be pulled out from the reaction tank because it is blocked by the air-solid-liquid separating plate. Therefore, there is a problem that maintenance of the stirring blade and the rotating shaft becomes difficult.

In view of such problems, it is an object of the present disclosure to provide an anaerobic treatment apparatus capable of easily performing maintenance.

In order to solve the above problems, the anaerobic treatment apparatus according to one aspect of the present disclosure is formed of a cylindrical reaction tank, an inflow port formed in the reaction tank, and above the inflow port in the reaction tank. The outlet and the outlet are provided above the inlet in the reaction vessel and below the outlet, extend from the inner wall of the reaction vessel toward the center, and are arranged so as to maintain a gap between them. It has a plurality of partition plates, a rotating shaft, one or a plurality of stirring blades erected from the rotating shaft, and a drive unit for rotating the rotating shaft. The rotating shaft has a predetermined rotating shaft. The reaction vessel penetrates the gap, which is a shape that the stirring blade can pass through when the rotation angle is set and the stirring blade cannot pass through when the rotation axis is not at the predetermined rotation angle. The stirring blade is provided inside, and includes a stirring portion located below the partition plate in a state where the rotating shaft is penetrated through the gap.

Further, an extension plate extending downward from at least a part of the end side of the partition plate that partitions the longitudinal direction of the gap may be provided.

Further, the end side of the partition plate includes a first range extending from one end to a portion facing the rotating shaft and a second range extending from the other end to a portion facing the rotating shaft, and the extending plate includes the extending plate. Of the end sides of the partition plate, the partition plate provided in the first range, the partition plate 1 and the partition plate adjacent to the partition plate 1 are arranged so that the first range and the second range face each other. May be done.

Further, the extending plate may have an inclined portion that is inclined downward from the base end toward the tip end and the tip end is located on the rotation axis side of the base end.

Further, the partition plate may have a gas discharge port.

Maintenance can be easily performed.

It is a perspective view of the anaerobic processing apparatus which concerns on embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3A is a first top view of the anaerobic treatment apparatus. FIG. 3B is a second top view of the anaerobic treatment apparatus. FIG. 4A is a perspective view of the sealing portion. FIG. 4B is a top view of the sealing portion. It is a figure explaining the anaerobic processing apparatus concerning the 1st modification. FIG. 6A is a top view of the air-solid-liquid separation portion according to the second modification. FIG. 6B is a vertical cross-sectional view of the gas-solid-liquid separation portion according to the second modification.

An embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, etc. shown in such an embodiment are merely examples for facilitating understanding, and do not limit the present disclosure unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate description, and elements not directly related to the present disclosure are omitted from the illustration. To do.

(Anaerobic processing device 100)
FIG. 1 is a perspective view of the anaerobic treatment apparatus 100 according to the present embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. In the following figures including FIGS. 1 and 2 of the present embodiment, vertically intersecting X-axis, Y-axis, and Z-axis (vertical direction) are defined as shown in the figure. Further, in order to facilitate understanding, the lid portion 112 and the drive portion 126 are omitted in FIG.

The anaerobic treatment device 100 is a device that treats (decomposes) an object to be treated (organic substance, nitrogen oxide (nitrate ion or nitrite ion)) contained in the liquid to be treated by an anaerobic organism. In the present embodiment, the anaerobic organism includes a facultative anaerobic organism, for example, a denitrifying bacterium and a methanogen.

As shown in FIGS. 1 and 2, the anaerobic treatment apparatus 100 has an anaerobic organism (or a granule of an anaerobic organism (a size of about 0.2 mm to 2 mm mainly composed of an aggregate of a plurality of anaerobic organisms). A reaction tank 110 is provided for accommodating a liquid to be treated (a liquid containing an object to be treated). Since the anaerobic organism has a higher mass density than the liquid to be treated, it has settled in the lower part of the reaction tank 110. Therefore, an anaerobic organism layer composed of anaerobic organisms is formed in the lower part of the reaction tank 110. The reaction tank 110 has, for example, a cylindrical shape. The upper opening of the reaction vessel 110 is covered with a lid 112.

An inflow port 114 is formed in the reaction tank 110, and the liquid to be treated is introduced into the reaction tank 110 through the inflow port 114. An outlet 116 is formed above the inlet 114 and above the anaerobic biological layer in the reaction vessel 110. The liquid to be treated introduced from the inflow port 114 passes through the anaerobic biological layer and finally reaches the outflow port 116. Anaerobic organisms have the function of decomposing the object to be treated into gas and low molecular weight carbon compounds. Therefore, in the process of the liquid to be treated introduced from the inflow port 114 passing through the anaerobic biological layer, the material to be treated in the liquid to be treated is decomposed into gas and a low molecular weight carbon compound.

Therefore, the outlet 116 is reached by the liquid to be treated (hereinafter, simply referred to as “post-treatment liquid”) treated with an anaerobic biological layer (treatment for decomposing the object to be treated into gas and low molecular weight carbon compound). As a result, the treated liquid will flow out to the outside through the outlet 116. That is, the liquid to be treated and the liquid after treatment become an upward flow and move in the reaction tank 110.

As described above, since the anaerobic organism decomposes the object to be treated into gas and a low molecular weight carbon compound, when the decomposition of the object to be treated in the liquid to be treated by the anaerobic organism proceeds, it is housed in the reaction vessel 110. Gas will be dispersed in the liquid. Then, the gas adheres to the anaerobic organism, and a floating organism (an aggregate of the gas and the anaerobic organism) is generated in the reaction tank 110. Since anaerobic organisms have a higher mass density than the liquid to be treated, they usually settle to form an anaerobic organism layer, but floating organisms ride on the flow (upwelling flow) of the liquid to be treated and the liquid after treatment. It may rise and flow out from the outlet 116 formed in the upper part of the reaction vessel 110. Then, the number of anaerobic organisms in the reaction tank 110 is reduced, and the decomposition efficiency of the object to be treated is lowered.

Therefore, the anaerobic treatment apparatus 100 includes a stirring unit 120 and an air-solid-liquid separating unit 130. The stirring unit 120 includes a rotating shaft 122, a stirring blade 124, and a driving unit 126. The rotation shaft 122 extends in the vertical direction and is arranged in the reaction tank 110, and is rotated by the drive unit 126. The stirring blade 124 is a member erected from the rotating shaft 122. In other words, the stirring blade 124 is a member extending from the rotating shaft 122 toward the radial outer side (outside) of the rotating shaft 122. Here, two stirring blades 124 are provided symmetrically about the rotation axis 122, and the angle formed by the stirring blades 124 is, for example, 180 °. Further, in the present embodiment, the stirring blade 124 is a picket fence type in which a plurality of wires are arranged in the direction of the rotation axis.

The drive unit 126 is configured to include, for example, a motor, and rotates the rotation shaft 122. The drive unit 126 is placed on the lid unit 112. In the present embodiment, the stirring unit 120 is arranged in the reaction tank 110 so that the stirring blade 124 is located in the anaerobic biological layer. With the configuration including the stirring unit 120, the anaerobic organism layer can be stirred, and the floating organism can be separated into a gas and an anaerobic organism.

The air-solid-liquid separation unit 130 is provided above the stirring blade 124 and below the outlet 116. The gas-solid-liquid separation unit 130 is composed of two separation units 132 arranged so as to maintain a gap 150 with each other. The two separation units 132 are placed on a cylindrical frame portion 134 protruding from the inner wall 110a of the reaction tank 110.

The separation unit 132 includes a partition plate 140, a first side wall 142, and a second side wall 144. The partition plate 140 is provided above the inflow port 114 and below the outflow port 116 in the reaction tank 110, and extends from the inner wall 110a of the reaction tank 110 toward the center. In the present embodiment, the partition plate 140 has a shape (substantially semicircular shape) having an arc and a chord, and the arc is arranged along the inner wall 110a. Further, in the present embodiment, the partition plate 140 is provided along the horizontal direction.

The first side wall 142 is a wall extending vertically downward from the arc of the partition plate 140. The separation unit 132 is fixed in the reaction tank 110 by placing the first side wall 142 on the frame portion 134. The second side wall 144 is a wall extending vertically downward from the string of the partition plate 140.

Subsequently, the function of the air-solid-liquid separation unit 130 will be described. The gas separated from the floating organisms by the stirring unit 120 and the floating organisms float upward on the flow of the liquid after treatment or the liquid to be treated (swirl ascending flow). Since the partition plate 140 of the gas-solid-liquid separation unit 130 is arranged on the ascending path of the treated liquid from the anaerobic organism layer to the outlet 116, gas and levitation organisms are attached to the partition plate 140 in the ascending process. It will collide.

By collision with the partition plate 140, the floating organisms are separated into gas and anaerobic organisms. The gas thus separated and the gas separated by the stirring unit 120 and colliding with the partition plate 140 are temporarily stored in the region surrounded by the partition plate 140, the first side wall 142, and the second side wall 144, and then are stored. The gas is discharged to the outside through the gas discharge port 140a formed in the partition plate 140. As a result, the gas can be effectively used. On the other hand, the anaerobic organisms separated by the gas-solid-liquid separation unit 130 settle under their own weight and are reused in the anaerobic organism layer.

The gap 150 is formed between the two separation units 132, that is, between the strings of the two partition plates 140 (between the second side walls 144). The gap 150 is formed so that the rotating shaft 122 can pass through, has a shape through which the stirring blade 124 can pass when the rotating shaft 122 has a predetermined rotation angle, and the rotating shaft 122 rotates at a predetermined value. The shape is such that the stirring blade 124 cannot pass when it is not at an angle.

FIG. 3 is a top view of the anaerobic processing apparatus 100. In FIG. 3, the lid portion 112, the driving portion 126, and the sealing portion 160 are omitted for ease of understanding.

As shown in FIG. 3A, the horizontal cross-sectional shape (XY cross-section in FIG. 3) of the gap 150 is substantially the same as the horizontal cross-sectional shape of the stirring blade 124, and is substantially rectangular here. The horizontal cross-sectional area of the gap 150 is larger than the horizontal cross-sectional area of the stirring blade 124. Further, as shown in FIG. 3B, the gap 150 is within the gap 150 when the horizontal cross section of the stirring blade 124 is projected onto the horizontal cross section of the gap 150 when the rotation axis 122 has a predetermined rotation angle. The shape is such that the stirring blade 124 can be accommodated.

By providing such a gap 150, the stirring unit 120 (rotating shaft 122, stirring blade 124) can be pulled out from the reaction tank 110. Therefore, when a problem occurs in the stirring blade 124, for example, the stirring blade 124 is damaged, the rotating shaft 122 is moved to a predetermined rotation angle and then the rotating shaft 122 is pulled out to stir the entire rotating shaft 122. The blade 124 can be taken out of the reaction tank 110. As a result, maintenance such as repair or replacement of the rotating shaft 122 and the stirring blade 124 can be easily performed.

Returning to FIGS. 1 and 2, two sealing portions 160 are provided in the gap 150 of the anaerobic treatment apparatus 100. Specifically, in the gap 150 (longitudinal direction of the gap 150), sealing portions 160 are arranged on both sides of the rotating shaft 122. The sealing portion 160 includes a first extending plate 162, a second extending plate 164 (extending plate), and a locking portion 166.

FIG. 4 is a diagram illustrating the sealing portion 160. FIG. 4A is a perspective view of the sealing portion 160. FIG. 4B is a top view of the sealing portion 160. In FIG. 4 (b), the first extending plate 162 is shown in black to facilitate understanding, and the locking portion 166 is omitted.

As shown in FIG. 4A, the first extending plate 162 constituting the sealing portion 160 of 1 has an end side 140b that divides the longitudinal direction of the gap 150 in one partition plate 140, that is, vertically from the string. It is a plate extending downward. The second extending plate 164 constituting the sealing portion 160 of 1 is configured to include a main body portion 164a and an inclined portion 164b. The main body portion 164a is an end side 140b that divides the gap 150 in the other partition plate 140 in the longitudinal direction, that is, a plate extending vertically downward from the strings. The inclined portion 164b is a plate that is continuous with the lower end of the main body portion 164a and is inclined downward from the base end toward the tip end. Further, the inclined portion 164b is located on the end side 140b side of the partition plate 140 whose tip is relative (opposing) to the base end (tip of the main body portion 164a), and is a vertical line (rotation axis) passing through the center of the gap 150. It extends beyond the axis of 122) (see FIG. 2).

The second extending plate 164 is longer in the vertical direction than the first extending plate 162. Specifically, the lower end of the second side wall 144 is located below the lower end of the first extending plate 162. The lower end of the main body portion 164a of the second extending plate 164 is located below the lower end of the second side wall 144.

The locking portion 166 supports the upper end of the first extending plate 162 and the upper end of the second extending plate 164, and is locked to one partition plate 140 and the other partition plate 140. The locking portion 166 locks the first extending plate 162 and the second extending plate 164 so as to face each other in the sealing portion 160 of 1.

Focusing on the second extending plate 164 in the two sealing portions 160, as shown in FIG. 4A, the end side 140b of the partition plate 140 extends from one end to the portion facing the rotation shaft 122. It includes a range 140ba and a second range 140bb extending from the other end to a portion facing the rotation shaft 122. As shown in FIGS. 4A and 4B, the first extending plate 162 is provided in the second range 140bb of the end sides 140b (strings) of the partition plate 140, and the second extending plate 162 is provided. The 164 is provided in the first range 140ba of the end sides 140b (strings) of the partition plate 140. Further, one partition plate 140 and the other partition plate 140 are arranged so that the first range 140ba and the second range 140bb face each other. That is, when viewed from a direction orthogonal to the extending direction of the inclined portion 164b (Y-axis direction (horizontal direction) in FIG. 2), the inclined portion 164b of the sealing portion 160 of 1 and the inclination of the other sealing portions 160 are inclined. It is arranged so as to intersect with the portion 164b.

With this configuration, among the swirling updrafts generated by the rotation of the stirring blade 124 (rotating shaft 122), the swirling upwelling flow that enters the gap 150 can collide with the inclined portion 164b, and the floating organisms can collide with the inclined portion 164b. It is possible to reduce the possibility of outflow.

Further, the inclined portion 164b is continuous with the lower end of the main body portion 164a, is inclined downward from the base end toward the tip end, and the tip end is located on the rotation shaft 122 side from the base end. Further, as described above, the two inclined portions 164b are provided so as to intersect each other (so that the inclined directions are opposite to each other). Therefore, the inclined portion 164b collides with the swirling ascending flow generated by the stirring of the stirring portion 120, and the collided flow moves downward. This makes it possible to separate the gas from the rising buoyant organisms and return the gas-separated anaerobic organisms to the anaerobic organism layer.

Since the sealing portion 160 is only locked to the partition plate 140 by the locking portion 166, it can be easily removed. Therefore, maintenance of the rotating shaft 122 and the stirring blade 124 can be easily performed.

(First modification)
In the above embodiment, the configuration in which the partition plate 140 of the anaerobic treatment apparatus 100 extends along the horizontal direction over the entire surface has been described as an example. However, the shape of the partition plate 140 is not limited.

FIG. 5 is a diagram illustrating an anaerobic treatment apparatus 200 according to the first modification. The components substantially the same as the above-mentioned anaerobic processing apparatus 100 are designated by the same reference numerals, and duplicate description will be omitted.

The partition plate 240 of the anaerobic treatment apparatus 200 has a horizontal plane 242 extending horizontally from the inner wall 110a side (arc) toward the gap 150 (string) and an inclination that is continuous with the horizontal plane 242 and inclined downward toward the strings. It has a surface 244 and.

With such a configuration, a storage portion for the treatment liquid can be formed between the inclined surfaces 244. Therefore, in the storage portion, the floating organisms that have passed through the gap 150 can be settled and separated, and the anaerobic organisms that flow out from the outlet 116 can be reduced.

(Second modification)
In the first modification of the above embodiment, a configuration in which gas is stored in the gas-solid-liquid separation unit 130 and the gas is recovered through the gas discharge port 140a has been described as an example. However, when gas recovery is not required, such as when anaerobic organisms are denitrifying bacteria, it is not necessary to store gas. In the second modification, the gas-solid-liquid separation unit 330 that does not store gas will be described.

FIG. 6A is a top view of the air-solid-liquid separation unit 330 according to the second modification. FIG. 6B is a vertical cross-sectional view of the gas-solid-liquid separation unit 330 according to the second modification. The components substantially the same as the above-mentioned anaerobic processing apparatus 100 are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIGS. 6 (a) and 6 (b), the gas-solid-liquid separating portion 330 includes a flange portion 332, a first side wall 334, a partition plate 340, and an extension plate 350. To. The first side wall 334 has a cylindrical shape, and a flange portion 332 is provided at the upper end thereof. Therefore, the gas-solid-liquid separation unit 330 can be installed in the reaction tank 110 simply by locking the flange portion 332 to the upper end of the reaction tank 110.

The partition plate 340 is a plate that is continuous with the first side wall 334, is inclined downward from the base end toward the tip end, and the tip end is located on the center side, and two partition plates 340 are provided in the air-solid-liquid separation unit 330. .. In the air-solid-liquid separation unit 330, a gap 150 is formed between the partition plates 340.

The extending plate 350 is a plate extending vertically downward from the lower end of the partition plate 340. The extension plate 350 is provided in the first range at the end side (lower end) of the partition plate 340, similarly to the second extension plate 164 of the above embodiment, and includes one partition plate 340 and the other partition plate 340. Is arranged so that the first range and the second range face each other. By providing the extending plate 350, among the swirling ascending currents generated by the rotation of the stirring blade 124 (rotating shaft 122), the swirling ascending currents entering the gap 150 can collide with the extending plate 350, and the gap 150 can be provided. It is possible to reduce the possibility that the floating organisms will flow out through the above.

According to the gas-solid-liquid separation unit 330 according to the second modification, maintenance of the rotating shaft 122 and the stirring blade 124 can be easily performed. When the gas-solid-liquid separation unit 330 according to the second modification is used, the gas is released to the outside through the gap 150.

Although the embodiments have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to such embodiments. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, and it is understood that they also naturally belong to the technical scope.

For example, in the above-described embodiment, the configuration including the first side wall 142 and the second side wall 144 has been described as an example, but the first side wall 142 and the second side wall 144 are not essential configurations. The gas-solid-liquid separation unit 130 may have at least a partition plate 140.

Further, in the above embodiment, a bearing may be provided in the center of the bottom surface of the reaction tank 110, and the rotating shaft 122 may be installed so that the tip of the rotating shaft 122 comes into contact with the bearing.

Further, in the above embodiment, the configuration in which the rotating shaft 122 is provided extending in the vertical direction has been described as an example. However, the rotation axis 122 may extend in a direction orthogonal to the vertical direction.

Further, in the above embodiment, the configuration in which the gas-solid-liquid separation unit 130 is placed on the frame unit 134 has been described as an example. However, a flange portion may be provided in the gas-solid-liquid separation portion 130, and the flange portion may be locked to the upper end of the reaction tank 110.

Further, in the above embodiment, the configuration in which the anaerobic treatment apparatus 100 includes the sealing portion 160 has been described as an example. However, the sealing portion 160 is not an essential configuration.

Further, in the above embodiment, the configuration in which the second extending plate 164 has the inclined portion 164b has been described as an example. However, the inclined portion 164b is not an essential configuration. Further, the first extension plate 162 is not an essential configuration either.

Further, in the above embodiment, the stirring unit 120 provided with two stirring blades 124 has been described as an example. However, the number of stirring blades 124 is not limited, and may be 1 (1 stirring blade extending radially outward from the rotation axis) or 3 or more (for example, the horizontal cross section has a cross shape). It may be. In any case, the gap 150 may have a shape that allows the stirring blade 124 to pass through when the rotation shaft 122 has a predetermined rotation angle. Further, the extension plate is provided in the first range of the end sides of the partition plate, and the first range and the second range of the partition plate 1 and the partition plate adjacent to the partition plate 1 face each other. It should be distributed.

The present disclosure can be used in an anaerobic treatment apparatus that treats an object to be treated by an anaerobic organism.

100 Anaerobic treatment device 110 Reaction tank 110a Inner wall 114 Inflow port 116 Outlet 120 Stirring part 122 Rotating shaft 124 Stirring blade 126 Drive part 140 Partition plate 140a Gas discharge port 150 Gap 164 Second extending plate (extending plate)
164b Inclined part 200 Anaerobic treatment device 240 Partition plate 340 Partition plate 350 Extension plate

Claims (5)

Cylindrical reaction tank and
The inflow port formed in the reaction vessel and
An outlet formed above the inlet in the reaction vessel and
With a plurality of partition plates provided above the inflow port and below the outflow port in the reaction vessel, extending from the inner wall of the reaction vessel toward the center, and arranged so as to maintain a gap between them. ,
It has a rotation shaft, one or a plurality of stirring blades erected from the rotation shaft, and a drive unit for rotating the rotation shaft, and the rotation shaft is said to have a predetermined rotation angle when the rotation shaft has a predetermined rotation angle. When the stirring blade is passable and the rotation axis is not at the predetermined rotation angle, the stirring blade is arranged in the reaction vessel through the gap having a shape that the stirring blade cannot pass through, and the stirring is performed. The blades include a stirring portion located below the partition plate in a state where the rotating shaft is penetrated through the gap.
An anaerobic treatment device comprising. The anaerobic treatment apparatus according to claim 1, further comprising an extending plate extending downward from at least a part of an end edge of the partition plate for partitioning the longitudinal direction of the gap. The end side of the partition plate includes a first range extending from one end to a portion facing the rotating shaft and a second range extending from the other end to a portion facing the rotating shaft.
The extending plate is provided in the first range of the end sides of the partition plate.
The anaerobic treatment apparatus according to claim 2, wherein the partition plate of 1 and a partition plate adjacent to the partition plate of 1 are arranged so that the first range and the second range face each other. The anaerobic treatment apparatus according to claim 3, wherein the extending plate is inclined downward from the base end toward the tip end, and the tip end has an inclined portion located on the rotation axis side of the base end. The anaerobic treatment apparatus according to any one of claims 1 to 4, wherein the partition plate has a gas discharge port.

Images