JP4163146B2 - Aggregation treatment method - Google Patents

Description

  The present invention relates to an agglomeration method, and more particularly to an agglomeration method that can reduce the amount of a flocculant used for agglomeration of wastewater to be treated.

The present inventor has already proposed a tank capable of efficiently performing the flocculation treatment of the wastewater to be treated (Patent Document 1). This is because a partition that moves up and down is provided in the tank body, and an upper chamber that functions as an aggregating tank for aggregating the wastewater to be treated and a lower chamber that stores water for adjusting the water level are partitioned. The water for adjusting the water level is discharged from the lower chamber or supplied to the lower chamber to move the partition wall downward or upward, and the volume of the upper chamber and the lower chamber is relatively changed, so that the wastewater to be treated is The treated water that has been introduced or coagulated in can be discharged from the upper chamber.
Japanese Patent No. 3492300

  As a result of further study on efficiency in the case of aggregating the wastewater to be treated using such a tank, the present inventor has focused on the large amount of the flocculant used when aggregating the wastewater to be treated. did. In other words, in the conventional flocculation method, every time solid-liquid separation of the wastewater to be treated is performed, the same amount of flocculating agent must be continuously added. The proportion of flocculant cost occupied was high.

  Thus, the present invention has an object to provide an agglomeration method that can reduce the amount of flocculant charged into the agglomeration treatment tank when treating the waste water and can reduce the running cost. To do.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

The invention according to claim 1 flocculates and separates suspended substances contained in the wastewater to be treated by adding a flocculant and a weight agent to the wastewater to be treated introduced into the agglomeration treatment tank. Thereafter, a coagulated bed is formed in which a part or all of the settled sedimentation sludge remains, and the treatment target wastewater is introduced into the coagulation treatment tank to aggregate the suspended substances contained in the treatment target wastewater. It is a coagulation treatment method characterized by separating.

According to a second aspect of the present invention, the tank body is provided with a partition wall that can be divided into upper and lower chambers to form an upper chamber and a lower chamber, and can move up and down to change the volume of the upper chamber and the lower chamber. The upper chamber has an inlet for treated wastewater and an outlet for treated water, and the lower chamber uses a tank having water inlet / outlet for adjusting the water level. By using at least a flocculant and a weighting agent effective for the agglomeration of the waste water, after aggregating and separating the suspended matter contained in the waste water to be treated, by introducing water for adjusting the water level into the lower chamber, The partition wall is moved upward to discharge the treated water so that a part or all of the settled sludge coagulated and separated in the upper chamber remains in the bottom of the upper chamber to form a coagulated bed, and then the lower chamber is discharged. The partition wall is moved downward by discharging water for adjusting the water level, and the agglomerated bed remains. A coagulation treatment to satisfy the new processed wastewater in the upper chamber.

A third aspect of the present invention is the coagulation treatment method according to the first or second aspect, wherein the flocculant comprises an inorganic flocculant and a polymer flocculant, and the weight agent comprises powdered activated carbon.

  According to the present invention, it is possible to reduce the amount of the flocculant charged into the flocculation tank when processing the waste water, and to reduce the running cost.

  Embodiments of the present invention will be described below.

  In the present invention, an effective flocculant for flocculation of wastewater to be treated (hereinafter referred to as raw water) is an inorganic flocculant generally used for the purpose of flocking and precipitating suspended substances contained in the raw water. A polymer flocculant can be used.

  Examples of inorganic flocculants include PAC (polyaluminum chloride), sulfuric acid band (aluminum sulfate), ferrous sulfate, ferric sulfate, ferric chloride, and the like. Use one or more of these. Can do. The polymer flocculant includes cationic, anionic, and nonionic types, and any of them can be used depending on the raw water.

  Furthermore, these inorganic flocculants and polymer flocculants can be used in combination, which is a preferred embodiment in the present invention.

  In the present invention, the weight agent is for adding a weight to the flocculent suspended material in the raw water by adding it to the raw water in the coagulation treatment tank together with the flocculant, and assisting the sedimentation thereof, Activated carbon, silica sand, zeolite, metal powder, metal particles, resin particles and the like can be used. Of these, activated carbon is preferred. This is because activated carbon has charge neutralization and can effectively aggregate suspended substances in raw water. In particular, activated carbon powder is more preferable.

  A coagulation treatment tank for treating raw water is provided with a coagulation bed containing at least these coagulants and weighting agents. The agglomerated bed is constituted by a part or all of the settled sludge obtained by flocking and suspending suspended substances in the raw water by adding a flocculant and a weight agent to the raw water in the flocculation treatment tank. In this case, a coagulant and a weighting agent effective for coagulation of the raw water described above are added to the raw water introduced into the coagulation treatment tank not equipped with a coagulation bed in an amount usually used according to the type and amount of the raw water. In addition, the suspended matter in the raw water may be made to floc and settle and separate, or the flocculant and the weight may be added to the raw water introduced into a tank installed in a place different from the coagulation treatment tank. The agent is added in an amount usually used according to the type and amount of raw water, and after suspending and separating suspended substances in the raw water, a part or all of the settled sludge is taken out and introduced into the coagulation treatment tank. You may make it comprise by doing.

  Next, the case where the aggregation processing method according to the present invention is performed using an aggregation processing tank will be described. FIG. 1 schematically shows an outline of the agglomeration treatment tank 1.

  In the figure, reference numeral 10 denotes a tank body, the inside of which is divided into upper and lower parts by a partition wall 11 formed of a flexible sheet or the like, and two chambers, an upper chamber 10A and a lower chamber 10B, are defined by the partition wall 11 as a boundary. ing.

  The partition wall 11 can be moved up and down with a substantially central portion in the height direction of the inner side surface of the tank body 10 as a fulcrum 11a, so that the volumes of the upper chamber 10A and the lower chamber 10B partitioned by the partition wall 11 can be relatively varied. It is said.

  In the upper part of the tank body 10, a raw water introduction port 12 and a treated water discharge port 13 treated in the upper chamber 10A are provided facing the upper chamber 10A, respectively. Are connected to the pipes 14a and 15a that are controlled to open and close. On the other hand, the lower chamber 10B in the tank body 10 is provided with a water level adjusting water inlet / outlet 16 for adjusting the water level of the lower chamber 10B, and is connected to a pipe 17a that is controlled to open and close by a valve 17. . The water for adjusting the water level is stored in a storage tank or the like (not shown), and is supplied / drained to / from the storage tank or the like via the pipe 17a.

  The agglomeration treatment tank 1 treats raw water in the upper chamber 10A by introducing raw water into the upper chamber 10A in the tank body 10, and here the upper chamber 10A is the agglomeration treatment tank in the present invention. It corresponds to.

  In order to fill the upper chamber 10A with raw water, first, the valve 15 is closed, the valves 14 and 17 are opened, and the water for adjusting the water level in the lower chamber 10B of the tank body 10 is discharged from the inlet / outlet port 16 of the water for adjusting the water level. As a result, the partition wall 11 moves downward and the volume of the lower chamber 10B gradually decreases. Accordingly, when the raw water is introduced into the upper chamber 10A from the inlet 12 through the pipe 14a, the inside of the tank body 10 is gradually increased. It will be filled with new raw water.

  Further, in order to discharge the supernatant treated water after the coagulation treatment in the upper chamber 10A, the valve 14 is closed, the valves 15 and 17 are opened, and the lower chamber 10B of the tank body 10 is opened from the inlet / outlet 16 of the water for adjusting the water level. Water for adjusting the water level is introduced inside. As a result, the partition wall 11 moves upward and the volume of the lower chamber 10B gradually increases. Accordingly, the volume of the upper chamber 10A gradually decreases, so that the treated water in the upper chamber 10A is discharged from the discharge port 13. It is discharged through the pipe 15a.

  In addition, opening / closing control of each valve | bulb 14, 15, 17 can be performed automatically. Moreover, the code | symbol 18 in FIG. 1 is the stirrer provided in the upper chamber 10A suspended form, and act | operates in the case of a stirring process.

  FIG. 2 is a process diagram showing an example of the aggregating method according to the present invention using the aggregating tank 1, and the aggregating method according to the present invention will be described with reference to FIG. 1 and FIG.

  Here, the raw water 2 is introduced into the upper chamber 10 </ b> A of the tank body 10 that does not have the agglomerated bed, and the agglomerated bed is formed by the settled sludge that is settled and separated by adding the flocculant and the weight agent to the raw water 2 for the first time. The case where it does is demonstrated.

  First, when the valve 15 of the flocculation treatment tank 1 is closed and the valves 14 and 17 are opened and the raw water 2 is introduced into the upper chamber 10A of the tank body 10 from the introduction port 12, the partition wall 11 moves downward accordingly. To relatively reduce the volume of the lower chamber 10B. As a result, by discharging the water for adjusting the water level in the lower chamber 10B from the inlet / outlet 16, the partition wall 11 was moved to the lowest position as shown in the first step at the left end in FIG. The upper chamber 10A is filled with the raw water 2.

  Thereafter, in the subsequent second step, a flocculant and a weight agent effective for agglomeration of the raw water 2 are added to the upper chamber 10A filled with the raw water 2, and further a pH adjuster is added if necessary. After performing, the suspended substances in the raw water 2 are agglomerated and separated by allowing to stand.

  The addition amount of the flocculant and the weight agent added here is an amount usually used (initial addition amount) according to the amount of raw water and the suspended substance (ss) concentration. The flocculant and the weight agent may be added in the process of introducing the raw water 2 into the upper chamber 10A through the pipe 14a connected to the flocculant treatment tank 1, or a lid (not shown) that can be opened and closed at the upper part of the tank body 10. And the lid may be opened at the time of addition and poured into the raw water 2 in the upper chamber 10A.

  After adding a flocculant and a weighting agent to the raw water 2 in the upper chamber 10A and stirring the mixture for a predetermined time by the stirrer 18, the stirrer 18 is stopped and allowed to stand to flock the suspended substances in the raw water 2 To flocculate and separate. The third step shows a step of performing flocculation and separation by standing, whereby the raw water in the upper chamber 10A is separated into the supernatant treated water 4 and the settled sludge. The code | symbol 5 in FIG. 2 has shown the agglomerated bed comprised by the sedimentation sludge. The agglomerated bed 5 contains at least the aggregating agent and the weighting agent added in the second step.

  After allowing the suspended solids to settle sufficiently by allowing to stand for a predetermined time, in the fourth step, the valves 15 and 17 of the flocculation tank 1 are opened, and the water 3 for adjusting the water level is introduced into the lower chamber 10B through the pipe 17a. Then, the water level in the lower chamber 10B is increased, and the partition wall 11 is gradually moved upward. As a result, the supernatant treated water 4 that has been agglomerated in the upper chamber 10 </ b> A is discharged from the discharge port 13 to the outside of the tank so as to be pushed up by the partition wall 11. The treated water 4 discharged here is subjected to a predetermined post-treatment such as a decoloring process (not shown), but the agglomerated bed 5 made of settled sludge remaining at the bottom of the upper chamber 10A is not discharged out of the tank. It is made to remain in the upper chamber 10A, and the upper chamber 10A is provided with the coagulation bed 5 prior to the coagulation treatment of the raw water 2 introduced thereafter.

  Here, in order for the upper chamber 10A to include the agglomerated bed 5, the upward movement of the partition wall 11 by introducing the water level adjusting water 3 into the lower chamber 10B, the treated water 4 in the upper chamber 10A. Although it discharges | emits from the discharge port 13, it is made to carry out to such an extent that the aggregation bed 5 which remains in the bottom part in 10 A of upper chambers is not discharged | emitted.

  In order to discharge the treated water 4 to the extent that the agglomerated bed 5 in the upper chamber 10A is not discharged, the upward movement of the partition wall 11 by increasing the volume of the lower chamber 10B is referred to as treated water in the upper chamber 10A. After discharging 4 from the discharge port 13, control is performed to stop the aggregated bed 5 before starting to discharge (the former), or when the lower chamber 10B is full and the partition 11 is moved to the upper limit The volume of the upper chamber 10A may be set to such an extent that the aggregate bed 5 can remain (the latter).

  When the control to stop the upward movement of the partition wall 11 by stopping the introduction of the water level adjustment water 3 into the lower chamber 10B as in the former case, the stop timing of the partition wall 11 is the treated water from the upper chamber 10A. A turbidity sensor (not shown) is provided in the pipe 15a for discharging 4 and it is performed at the timing when it is detected that the treated water 4 discharged from the upper chamber 10A has started to change from clear water to cloudy water. Alternatively, a flow sensor (not shown) is provided in the pipe 17a for introducing the water for adjusting the water level 3 into the lower chamber 10B or the pipe 15a for discharging the treated water 4 from the upper chamber 10A. You may make it carry out at the timing which detected that the introduction amount of the water 3 for adjusting the water level to the chamber 10B reached a predetermined amount or the discharge amount of the treated water 4 from the upper chamber 10A reached a predetermined amount.

  Also in the latter case, if such a turbidity sensor is provided in the pipe 15a, the agglomerated bed 5 is formed when the amount of settled sludge becomes larger than the volume when the upper chamber 10A is minimized. When the excess sludge to be discharged is discharged from the discharge port 13, it can be controlled to switch the discharge destination to a sludge tank or the like by detecting that the sludge has changed to turbid water. Thereby, even when the amount of the settled sludge constituting the agglomerated bed 5 is increased by repeating the agglomeration treatment, a certain amount of the agglomerated bed 5 can be maintained in the upper chamber 10A.

  After the treated water 4 is discharged from the upper chamber 10A in this way, the process proceeds to the next fifth step with the agglomerated bed 5 provided at the bottom of the upper chamber 10A, and the upper chamber is performed in the same manner as in the first step. New raw water 2 is introduced into 10A.

  After the new raw water 2 is introduced into the upper chamber 10A provided with the agglomerated bed 5, a flocculant and, if necessary, a pH adjuster are newly added in the subsequent sixth step, and the same as in the second step. Then, stirring is performed for a predetermined time by the stirrer 18.

  The addition amount of the flocculant added here is significantly larger than the initial addition amount added in the second step because the aggregate bed 5 including at least the flocculant and the weight agent is already provided in the upper chamber 10A. Here, it is only necessary to add a small amount of about 1/5 to 1/10 of the initial addition amount.

  Then, the mixture is stirred for a predetermined time by the stirrer 18 and then left to stand, thereby flocking the suspended matter in the raw water 2 in the same manner as in the third step, and separating into the supernatant treated water 4 and the sedimented sludge.

  In addition, although the weight agent is not added in the sixth step, the amount of the settled sludge constituting the aggregate bed 5 is increased and partially discharged from the upper chamber 10A. In the case where the content of slag decreases, it is preferable that a certain amount of weight agent is contained in the coagulated bed 5 by appropriately supplementing according to the amount of sedimented sludge discharged.

  Thereafter, the raw water 2 is introduced into the upper chamber 10A provided with the coagulating bed 5 by sequentially repeating the third to sixth steps, and the suspended substances contained in the raw water 2 are coagulated and separated.

  Generally, it is considered that the flocculant once introduced into the raw water 2 is consumed by the flocculation reaction, and the amount of the flocculant added in the sixth step is the amount of the newly introduced raw water 2 or It is customary to add an amount commensurate with the suspended matter (ss) concentration. However, in the present invention, it is surprisingly newly added to the newly introduced raw water 2 by providing the coagulating bed 5 including at least the coagulant and the weight agent constituted by the settled sludge in the upper chamber 10A. Even if the amount of the flocculant is reduced, the suspended substances in the raw water 2 can be flocculated and separated without any problem. As a result, the ratio of the flocculant cost to the running cost can be reduced, and the running cost can be reduced.

  The agglomerated bed 5 in the upper chamber 10A can be constituted by all of the settled sludge settled and separated from the raw water 2, but when the amount of settled sludge is increased by repeating the agglomeration and separation, as described above, After discharging the treated water 4 in the fourth step, a part of the settled sludge constituting the aggregate bed 5 may be discharged so that a certain amount of the aggregate bed 5 is always formed in the upper chamber 10A.

  Note that when the agglomerated bed 5 is constituted by settled sludge formed in a tank installed at a location different from the agglomeration treatment tank 1, the first step and the second step in FIG. After the settling sludge is introduced into the chamber 10A in a predetermined amount according to the amount of the raw water 2 to form the coagulated bed 5, the raw water 2 is introduced in the same manner as the fifth step in FIG. The same process as described above may be sequentially repeated in the order of the third step and the fourth step.

  According to such a coagulation treatment method using the coagulation treatment tank 1, the treated water 4 coagulated in the upper chamber 10A can be discharged by moving the partition wall 11 upward, so that the upper chamber 10A. It is easy to leave the inner bottom cohesive bed 5 in the upper chamber 10A, and the coagulation treatment tank (upper chamber 10A) provided with the coagulated bed 5 can be configured easily. Since the treated water 4 is first discharged from the supernatant water in the upper chamber 10A, clear treated water 4 can always be taken out.

  Further, when the aggregation bed 5 in the upper chamber 10A increases due to repetition of the aggregation treatment, after the treated water 4 is discharged, the upward movement of the partition wall 11 is continued, so The part can be easily discharged out of the tank.

  Furthermore, according to such a coagulation treatment method using the coagulation treatment tank 1, a series of processes from supply of raw water to agitation, sedimentation separation, and discharge of treated water can be performed by one tank. No treatment facility is required, the facility work can be simplified and the area of the facility can be greatly reduced, so that a water treatment facility can be constructed extremely easily.

  Further, in the flocculation treatment tank 1, even if the amount of raw water 2 or treated water 4 in the upper chamber 10A changes, the relative water amount of the upper chamber 10A and the lower chamber 10B changes due to the vertical movement of the partition wall 11. As a result, the amount of water inside the agglomeration treatment tank 1 as a whole is always constant, so that there is an advantage of excellent self-weight balance.

  Furthermore, since the inside of the tank body 10 is hermetically sealed, there is no contact between raw water or treated water and the atmosphere, no sticking of pollutants, no odor release, and a hygienic environment can be maintained.

  The agglomeration treatment tank 1 is not limited to the case where it is installed on the ground and can be used by being immersed in water because the tank body 10 is hermetically sealed. In this case, if the agglomeration treatment tank 1 is immersed in the raw water and used, it is not necessary to secure a space for the agglomeration treatment (installation space for the agglomeration treatment tank 1), thereby saving space. In addition, the raw water can be easily introduced into the upper chamber 10A.

  In the above description, the agglomeration treatment method is described in which the agglomeration treatment tank 1 having the vertically movable partition 11 is used and the upper chamber 10A is used as an agglomeration treatment tank. The treatment method is not limited to the method using the agglomeration treatment tank 1 described above, and a normal treatment vessel may be used as the agglomeration treatment vessel.

  In addition, the aggregation treatment tank of the aggregation treatment method according to the present invention can take other various modes. For example, FIG. 3 shows an example in which the agglomeration treatment tank 100 is constituted by an agglomeration treatment chamber 20 formed by a side peripheral wall 21 and a bottom plate 23 attached to the lower end of the side peripheral wall 21 via a flexible sheet 22 so as to be movable up and down. Show.

  In the upper part of the side peripheral wall 21, a raw water introduction port 24 that is opened and closed by a valve 24a and a treated water discharge port 25 that is opened and closed by a valve 25a are provided. The bottom plate 23 is provided with a buoyancy adjustment bag 23a through which air is supplied and exhausted by an air supply / exhaust means (not shown). 26 is a lid that closes the upper part of the side peripheral wall 21, and 27 is a stirrer that is withdrawn from the lid 26 into the coagulation treatment chamber 20.

  Such a flocculation treatment tank 100 is soaked in the raw water to be subjected to the flocculation treatment, for example, rivers, ponds, swamps, seas, etc., and floated in the water by the anchors 28 by giving the side peripheral wall 21 a certain buoyancy. Installed.

  During the agglomeration treatment, raw water is introduced into the agglomeration treatment chamber 20 from the inlet 24 in a state where the volume of the agglomeration treatment chamber 20 is maximized by utilizing the weight of the bottom plate 23, and after the agglomeration treatment is performed, buoyancy adjustment is performed. The bag 23a is inflated, and the treated water is discharged from the discharge port 25 by moving the bottom plate 23 upward using its buoyancy as shown in FIG. 3 (b).

  The series of steps of introduction of the raw water, flocculation treatment, and discharge of the treated water is the same as the case of using the flocculation treatment tank 1 described above, and the water 3 for adjusting the water level into the lower chamber 10B of the flocculation treatment tank 1 described above. What is necessary is just to supply / exhaust with respect to the buoyancy adjustment bag 23a instead of this water supply / drainage.

  Such a coagulation treatment tank 100 can also coagulate raw water such as rivers, ponds, swamps, and the sea without the need for providing a special installation space on the ground.

  Hereinafter, the effect of the present invention will be illustrated by examples.

Precipitation preliminary experiment raw water (contaminated water for air conditioning cooling water) is filled in a 300 cc beaker, and by conducting a preliminary precipitation experiment, a coagulant effective for coagulating the raw water and its addition amount (addition amount per liter) Was converted). In addition, the ss density | concentration of raw | natural water was 160 mg / L (measurement method: Environmental Agency Notification No. 64 Appendix 8 in 1974). The results were as follows.

Flocculant 1:
PAC flocculant "MK-PAC" (manufactured by Mitsubishi Chemical Corporation) 75mg / L
Flocculant 2:
Polymer flocculant “251-A” (manufactured by Mitsubishi Chemical Industries, Ltd .: polyacrylamide, weak anion) ・ ・ ・ 0.375 mg / L

Generation of agglomerated bed (first time)
To the beaker filled with 300 cc of the raw water, the flocculant and the addition amount as obtained from the preliminary sedimentation experiment were added.

  In addition, 480 mg / L of powdered activated carbon (“Shirakaba C-50” manufactured by Takeda Pharmaceutical Company Limited) was added as a weighting agent.

  Since the raw water was close to acidity, the pH was adjusted by adding a predetermined amount of caustic soda as a pH adjuster so as to obtain a pH suitable for aggregation.

  Next, the raw water in the beaker to which the above flocculant, weight agent and the like were added was coagulated and separated. In the coagulation and separation method, the raw water was stirred at a medium speed for 1 to 3 minutes, then settling standby, and separated into supernatant water and sedimented sludge.

  Thereafter, only 200 cc of the supernatant water coagulated and separated from the beaker was discharged to form a 100 cc coagulated bed in which the supernatant water and the settled sludge were mixed.

  In addition, the measurement result of the ss density | concentration of the supernatant water at this time was 2 mg / L or less.

Repeat experiment (2nd to 10th)
In the beaker in which 100 cc of the aggregate bed was formed in the first experiment, 200 cc of raw water was newly added to make a total of 300 cc.

  The addition amount of the flocculant after the second time is reduced to about 1/5 of the addition amount confirmed as appropriate in the preliminary sedimentation experiment, and “MK-PAC” per 300 cc is 15 mg / L, “251- A "was 0.15 mg / L.

  The raw water in the beaker was agitated in the same manner as in the first time, and after waiting to settle and separated into supernatant water and sedimented sludge, only 200 cc of the supernatant water in the beaker was discharged to form 100 cc of the aggregate bed. 200 cc of fresh raw water was added to the beaker, and the process of returning to 300 cc and repeating the flocculation separation was continued up to the 10th time.

  In addition, the activated carbon which is a weight agent was not added after the 2nd time. In the second and subsequent times, a predetermined amount of caustic soda was added as a pH adjusting agent to adjust the pH of the raw water in the beaker to a pH suitable for aggregation.

  Moreover, the ss density | concentration of each supernatant water from the 2nd time to the 10th time was all 2 mg / L or less. As for the transparency and chromaticity of the supernatant water, the transparency and chromaticity of the same degree as the first time could be secured even after the second time.

  The addition amounts of the flocculant and the weight agent from the first time to the 10th time are shown in Table 1 above.

  As a result, as shown in Table 1, it was confirmed that the raw water can be sufficiently coagulated and separated even with the addition amount reduced to about 1/5 with respect to the initial addition amount of the flocculant shown in the first time. . Thereby, it was confirmed that the ratio of the flocculant cost to the running cost can be reduced, and the running cost can be reduced.

Schematic diagram showing the outline of the agglomeration tank Process drawing showing an example of the coagulation treatment method according to the present invention (A) (b) is a schematic diagram which shows the other aspect of a coagulation processing tank.

Explanation of symbols

1: Aggregation treatment tank 10: Tank body 10A: Upper chamber (aggregation treatment tank)
10B: Lower chamber 11: Partition 12: Inlet port 13: Discharge port 16: Inlet / outlet port 18: Stirrer 2: Raw water 3: Water for adjusting water level 4: Treated water 5: Aggregate bed 100: Agglomeration treatment tank 20: Aggregation treatment chamber 21: Side wall 22: Flexible sheet 23: Bottom plate 24: Inlet for raw water 25: Discharge port for treated water 26: Lid 27: Stirrer

Claims (3)

In the agglomeration treatment tank, after adding a flocculant and a weighting agent to the waste water to be treated introduced into the agglomeration treatment tank to agglomerate and separate suspended substances contained in the waste water to be treated, An agglomeration characterized in that it comprises an agglomerated bed formed partly or entirely, and introduces the waste water to be treated into the agglomeration treatment tank to agglomerate and separate suspended substances contained in the waste water to be treated. Processing method. The tank body is divided into upper and lower parts to form an upper chamber and a lower chamber, and has a partition wall that can be moved up and down to change the volume of the upper and lower chambers. In the lower chamber, a tank having a water inlet / outlet for adjusting the water level is used.
Filling the upper chamber with the wastewater to be treated, using at least a flocculant and a weighting agent effective for agglomeration of the wastewater to be treated, and coagulating and separating suspended substances contained in the wastewater to be treated;
By introducing water for adjusting the water level into the lower chamber, the partition wall is formed to such an extent that a part or all of the settled sludge coagulated and separated in the upper chamber remains at the bottom of the upper chamber to form an agglomerated bed. Move it upward to discharge the treated water,
Subsequently, the water for adjusting the water level in the lower chamber is discharged to move the partition wall downward, and the upper chamber in which the coagulated bed remains is filled with a new wastewater to be treated. 3. The coagulation treatment method according to claim 1, wherein the coagulant comprises an inorganic coagulant and a polymer coagulant, and the weight agent comprises powdered activated carbon.

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