JP7236475B2 - Coagulation-sedimentation treatment device and coagulation-sedimentation treatment method - Google Patents

Description

The present invention relates to a coagulating sedimentation treatment apparatus.

As a coagulation-sedimentation treatment apparatus that coagulates and sediments organic matter and the like by adding a coagulant to raw water, for example, a coagulation-sedimentation treatment apparatus having a sludge blanket as disclosed in Patent Document 1 is known. In this coagulating-sedimentation treatment apparatus, coagulated flocs contained in raw water to which a coagulant has been added are captured by the sludge blanket formed in the sludge blanket section. Thereby, the flocculated floc and the treated water are separated.

JP-A-11-47757

However, in the coagulation-sedimentation treatment apparatus, the coagulation state of the sludge blanket sometimes deteriorates, for example, when the apparatus is started up after being stopped. When water treatment is performed in such a state, the flocs become finer and flow out together with the treated water without being captured by the sludge blanket. Therefore, there is a problem that the water quality of the treated water is deteriorated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coagulation-sedimentation treatment apparatus capable of stabilizing the water quality of treated water regardless of the state of coagulation of a sludge blanket.

A coagulation-sedimentation treatment apparatus according to one aspect of the present invention includes a coagulation-sedimentation tank including a sludge blanket section having a sludge blanket that receives raw water and captures solids contained in the raw water to generate treated water, and a coagulation-sedimentation tank. a supply line for supplying raw water to the sludge blanket part of the sludge blanket; a flocculation control agent to at least one of the supply line and the sludge blanket section based on.

In this coagulation-sedimentation treatment apparatus, the coagulation modifier supply section supplies the coagulation modifier to at least one of the supply line and the sludge blanket section based on the coagulation state of the sludge blanket. The aggregation modifier supply section can directly supply the aggregation modifier to the sludge blanket by supplying the aggregation modifier to the sludge blanket section. In addition, since the supply line is a line that supplies raw water to the sludge blanket section, the aggregation modifier supply section supplies the aggregation modifier directly to the sludge blanket by supplying the aggregation modifier to the supply line. can be done. Therefore, even when the flocculation state of the sludge blanket is deteriorated, the flocs of the sludge blanket are quickly re-flocculated by the flocculation modifier. As a result, the coagulation state of the sludge blanket is restored, and the treated water can be maintained in good quality. As described above, the water quality of the treated water can be stabilized regardless of the aggregation state of the sludge blanket.

In one embodiment, it comprises a reaction tank for reacting raw water and a flocculation modifier, and a switching unit for switching the supply destination of the flocculation modifier by the flocculation modifier supply unit, wherein the switching unit is based on the flocculation state of the sludge blanket. , the supply destination of the flocculation modifier may be switched from the reaction tank to at least one of the supply line and the sludge blanket section. As a result, in the normal operation state, the aggregation modifier supply unit supplies the aggregation modifier to the reaction tank, and after sufficiently reacting the aggregation modifier and raw water in the reaction tank, the sludge blanket unit can be supplied to On the other hand, when the flocculation state of the sludge blanket deteriorates, the flocs of the sludge blanket can be quickly re-flocculated by the flocculation modifier by switching the switching unit.

In one form, the aggregation modifier supply section may supply the aggregation modifier to the supply line. When the flocculation modifier is supplied to the supply line, the flocculation modifier can be uniformly supplied to the sludge blanket together with the raw water in the flocculation sedimentation tank by a distributed supply mechanism such as a distributor.

In one form, the flocculation modifier supply section may supply the flocculation modifier to the sludge blanket section. In this way, since the coagulation modifier supply section directly feeds the coagulation modifier into the sludge blanket section, the sludge in the sludge blanket can be immediately recoagulated, and operation can be performed without degrading the treated water quality.

In one form, the flocculation modifier supply section may supply the flocculation modifier to the upper layer of the sludge blanket section. In this case, the agglomeration state near the upper layer of the sludge blanket can be recovered intensively. Here, when the state of flocculation deteriorates, flocs that have not been captured flow out together with the treated water from the upper layer of the sludge blanket. Therefore, by intensively recovering the aggregation state near the upper layer of the sludge blanket, it is possible to quickly prevent small flocs from flowing out.

ADVANTAGE OF THE INVENTION According to this invention, the coagulation-sedimentation treatment apparatus which can stabilize the water quality of a treated water regardless of the aggregation state of a sludge blanket is provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the coagulation-sedimentation processing apparatus which concerns on embodiment of this invention. It is a schematic block diagram of the coagulation-sedimentation processing apparatus which concerns on a modification. It is a schematic block diagram of the coagulation-sedimentation processing apparatus which concerns on a modification. It is a schematic block diagram of the coagulation-sedimentation processing apparatus which concerns on a modification.

Various embodiments are described in detail below with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and overlapping descriptions are omitted.

FIG. 1 is a schematic configuration diagram of a coagulation-sedimentation treatment apparatus according to one embodiment of the present invention. As shown in FIG. 1 , the coagulating sedimentation treatment apparatus 100 includes a coagulating sedimentation tank 10 , a reaction tank 20 , an inorganic coagulant supply section 30 and a polymer coagulant supply section 40 . In addition, the coagulation-sedimentation treatment apparatus 100 includes a line L1 for supplying raw water to the reaction tank 20, a line L2 for supplying raw water reacted with the inorganic coagulant in the reaction tank 20 to the coagulation-sedimentation tank 10, and a coagulation-sedimentation Line L3 for taking out treated water treated in tank 10, lines L6 and L4 for supplying inorganic coagulant from inorganic coagulant supply unit 30 to reaction tank 20, line L5 branching from line L6 to line L2, high and a line L7 for supplying the polymer flocculant from the molecular flocculant supply unit 40 to the line L2.

The reaction tank 20 is a tank that stores the raw water supplied through the line L1 and reacts the raw water with the inorganic coagulant supplied from the inorganic coagulant supply unit 30 . The reaction tank 20 may be equipped with a stirring device 21 . As a result, the raw water and the inorganic coagulant in the reaction tank 20 are stirred by the stirring device 21, and the reaction between the solids contained in the raw water and the inorganic coagulant is sufficiently caused. Solids in the raw water are aggregated by reacting with the inorganic coagulant to form small aggregated flocs. The raw water in the reaction tank 20 is supplied to the coagulating sedimentation tank 10 through the line L2 at a predetermined flow rate. The reaction tank 20 may be supplied with a chemical other than the inorganic flocculant, for example, a pH adjuster for adjusting pH (see FIG. 4, for example).

The inorganic coagulant supply unit 30 supplies an inorganic coagulant to the raw water. The inorganic flocculant supply unit 30 supplies the inorganic flocculant to the reaction tank 20 through lines L6 and L4 during normal operation. In addition, the inorganic flocculant supply unit 30 temporarily supplies the inorganic flocculant to the line L2 via the lines L6 and L5 based on the flocculation state of the sludge blanket (details will be described later). As the inorganic flocculant, Al-based inorganic flocculants such as aluminum sulfate and PAC (polyaluminum chloride) may be used, and for example, Fe-based inorganic flocculants such as polyiron sulfate and iron chloride may be used. Metal components (Al and Fe) of the inorganic flocculant electrochemically react with solids such as organic matter in the raw water.

The polymer flocculant supply unit 40 supplies a polymer flocculant to the raw water. The polymer flocculant supply unit 40 supplies the polymer flocculant to the line L2 through the line L7 during normal operation. As a result, the polymer coagulant flows through the line L2 together with the raw water, and is supplied into the coagulating sedimentation tank 10 together with the raw water. As the polymer flocculant, for example, a polymer flocculant such as polyacrylamide or an organic coagulant such as polyamine may be used.

The coagulation-sedimentation tank 10 is a tank for obtaining treated water from which solids are removed by inflowing raw water and coagulating solids in the raw water. The coagulating sedimentation tank 10 includes a sludge blanket section 12 and a distributor 11 that distributes and supplies raw water to the sludge blanket section 12 . The sludge blanket section 12 has a sludge blanket that traps solids contained in the raw water (which become aggregated flocs by reacting with the inorganic coagulant) to generate treated water.

In the sludge blanket of the coagulating sedimentation tank 10, a fluidized bed of coagulated flocs is formed by the upward water flow in the tank, and the coagulated flocs newly formed by solids contained in the raw water are passed through the fluidized bed. At this time, the small aggregated flocs are captured by the large flocs in the fluidized bed and become larger, increasing the sedimentation speed. As a result, the raw water supplied to the sludge blanket portion of the coagulating sedimentation tank 10 is separated into treated water and coagulated flocs. As a result, the supernatant treated water from which the coagulated flocs have been removed by the sludge blanket of the coagulating sedimentation tank 10 is discharged to the outside through the line L3.

The distributor 11 supplies the raw water supplied from the line L2 to the sludge blanket section 12 . Distributor 11 can supply raw water to evenly distribute it into the sludge blanket. Thus, the distributor 11 is a part that can supply raw water to the sludge blanket section 12 by being connected to the line L2. Therefore, the distributor 11 belongs to the "supply line" in the claims. As described above, the flow path downstream of the reaction tank 20 and capable of supplying the raw water to the sludge blanket portion 12 may be referred to as the supply line L50. In this embodiment, the line L2 and the distributor 11 shall be included in the supply line L50.

Here, the coagulation-sedimentation treatment apparatus 100 according to the present embodiment has a structure capable of restoring the coagulation state of the sludge blanket when the coagulation state is deteriorated. The structure will be described below.

The coagulation-sedimentation treatment apparatus 100 includes a coagulation-adjusting-agent supplying section 120 . The aggregation modifier supply section 120 supplies the aggregation modifier to at least one of the supply line L50 and the sludge blanket section 12 based on the aggregation state of the sludge blanket. Cohesion modifiers are agents that improve the cohesion of sludge blankets. The flocculation modifier may directly improve the flocculation of the sludge blanket, such as an inorganic flocculant or a polymer flocculant. In addition, flocculation modifiers, like pH adjusters and sedimentation aids, can indirectly improve the flocculation and sedimentation properties of the sludge blanket by promoting the flocculation reaction or increasing the sedimentation property by increasing the specific gravity. can be improved. In the example shown in FIG. 1, an inorganic flocculant is employed as the flocculation modifier. In this embodiment, the inorganic flocculant supply section 30 and the lines L6 and L5 correspond to the flocculation modifier supply section 120 .

The location where the aggregation adjusting agent is supplied by the aggregation adjusting agent supply section 120 is at least one of the supply line L50 and the sludge blanket section 12 . When the aggregation modifier is supplied to the supply line L50 or the sludge blanket section 12, the aggregation modifier can quickly participate in the aggregation reaction in the sludge blanket. Thus, by supplying the coagulation modifier to the position like the supply line L50 and the sludge blanket section 12, the coagulation modifier can directly and quickly participate in the coagulation reaction of the sludge blanket. is sometimes referred to as "aggregation modifier supply position 110". As long as it is the aggregation adjusting agent supply position 110, the aggregation adjusting agent may be supplied to any position, and the aggregation adjusting agent may be supplied to a plurality of positions. In this embodiment, an inorganic flocculant, which is a flocculation modifier, is supplied to the line L2.

In addition, when the coagulation modifier is added to the reaction tank 20 and a location upstream of the reaction tank 20, the coagulation modifier reacts once with the solids contained in the raw water and is supplied to the sludge blanket. . Therefore, the flocculation modifier cannot directly contribute to the flocculation reaction of the sludge blanket, or the amount of the flocculation modifier that can contribute decreases.

For example, immediately after the installation of the equipment or at the start-up after stopping the operation, the coagulation effect of the coagulant in the sludge blanket is lost, and the coagulation state of the sludge blanket deteriorates. In addition, when the flocculation of the flocs is reduced for a certain reason during operation, the agglomeration state of the sludge blanket deteriorates. Also, when the quality of the raw water to be introduced is changed, the flocculation effect of the flocculant is reduced, and the flocculation state of the sludge blanket deteriorates.

Therefore, the aggregation adjusting agent supply unit 120 may supply the aggregation adjusting agent to the aggregation adjusting agent supply position 110 by detecting deterioration of the aggregation state of the sludge blanket with a sensor or the like. Alternatively, the aggregation modifier supply unit 120 may supply the aggregation modifier to the aggregation modifier supply position 110 based on a situation in which the aggregation state of the sludge blanket may deteriorate or is estimated to deteriorate. . For example, the aggregation modifier supply unit 120 may supply the aggregation modifier to the aggregation modifier supply position 110 based on the change in the quality of the raw water. Alternatively, in anticipation that the coagulation state of the sludge blanket will deteriorate at the start of operation, the coagulation modifier supply unit 120 may uniformly supply the coagulation modifier to the coagulation modifier supply position 110 at the time of startup.

The timing at which the aggregation adjusting agent supply unit 120 stops supplying the aggregation adjusting agent to the aggregation adjusting agent supply position 110 is not particularly limited. , the aggregation modifier supply unit 120 stops supplying the aggregation modifier to the aggregation modifier supply position 110 and returns to normal operation. Alternatively, the timing of stopping may be the elapse of a predetermined time after the supply of the aggregation modifier to the aggregation modifier supply position 110 is started. Alternatively, the timing of stopping may be determined when the state of aggregation of the sludge blanket is detected and recovery is confirmed.

In addition, it is preferable that the inorganic flocculant, which is a flocculation modifier, is supplied only to the reaction tank 20 during normal operation. When the inorganic flocculant is supplied to the aggregation modifier supply position 110, the aggregation reaction of the inorganic flocculant and the aggregation reaction of the polymer flocculant occur simultaneously. Therefore, before the inorganic flocculant uniformly reacts with the solid matter, the polymer flocculant causes aggregation, making it difficult for the inorganic flocculant to proceed with the agglomeration reaction. Also, when using a strongly acidic PAC as an inorganic flocculant, the position where the PAC is introduced becomes locally acidic, the molecular structure of the polymer flocculant changes, and the flocculating effect is partially reduced. . As described above, if the inorganic flocculant is supplied to the flocculation modifier supply position 110 until normal operation, a large amount of flocculant is required.

The coagulation-sedimentation treatment apparatus 100 includes a switching unit 50 for switching the supply destination of the coagulation adjusting agent by the coagulation adjusting agent supply unit 120 . The switching unit 50 switches the supply destination of the aggregation adjusting agent from the reaction tank 20 to at least one of the supply line L50 and the sludge blanket unit 12 based on the aggregation state of the sludge blanket. In this embodiment, the switching unit 50 may be configured by a valve provided at a connection portion of the line L6, the line L5, and the line L4. That is, when switching to supply the inorganic coagulant from the inorganic coagulant supply unit 30 to the reaction tank 20, the switching unit 50 connects the line L6 and the line L4 and blocks the line L5. When switching to supply the inorganic coagulant from the inorganic coagulant supply unit 30 to the line L2, the switching unit 50 connects the line L6 and the line L5 and blocks the line L4.

Next, an example of the operation mode of the coagulation-sedimentation treatment apparatus 100 shown in FIG. 1 will be described.

During normal operation, the switching unit 50 connects the line L6 and the line L4 and disconnects the line L5. Thereby, the inorganic flocculant supplying section 30 supplies the inorganic flocculant to the reaction tank 20 via the lines L6 and L4. As a result, the solid matter in the raw water reacts with the inorganic coagulant in the reaction tank 20 to form small coagulated flocs. Also, the polymer flocculant supply unit 40 supplies the polymer flocculant to the line L2. As a result, the raw water is supplied to the sludge blanket section 12 of the coagulating sedimentation tank 10 together with the coagulated flocs and the polymer coagulant. As a result, the treated water of good quality in which the flocculated flocs are captured by the sludge blanket is discharged from the line L3.

On the other hand, at the time of start-up after stopping the operation, it is estimated that the aggregation state of the sludge blanket has deteriorated, and the switching unit 50 connects the line L6 and the line L5, and cuts off the line L4. Thereby, the inorganic flocculant supplying section 30 supplies the inorganic flocculant to the line L2 via the lines L6 and L5. Also, the polymer flocculant supply unit 40 supplies the polymer flocculant to the line L2. As a result, the raw water is supplied to the sludge blanket section 12 of the coagulating sedimentation tank 10 together with the inorganic coagulant and the polymer coagulant. As a result, the flocs of the sludge blanket are reaggregated by the aggregation effect of the inorganic flocculant. As described above, the aggregation state of the sludge blanket is restored. After that, the coagulation-sedimentation treatment apparatus 100 returns to the normal operation described above.

In addition, when the inorganic flocculant is supplied to the flocculation modifier supply position 110, a large amount of flocculant is required as described above, but the operation for recovering the flocculation state of the sludge blanket is temporary. Therefore, the merit of quickly recovering the aggregation state is greater than the demerit of temporarily increasing the flocculant.

Next, the action and effect of the coagulating sedimentation treatment apparatus 100 according to this embodiment will be described.

In the coagulation-sedimentation treatment apparatus 100, the coagulation adjuster supply section 120 supplies the coagulation adjuster to the supply line L50 based on the aggregation state of the sludge blanket. Since the supply line L50 is a line that supplies raw water to the sludge blanket section 12, the aggregation modifier supply section 120 supplies the aggregation modifier directly to the sludge blanket by supplying the aggregation modifier to the supply line L50. can do. Therefore, even when the flocculation state of the sludge blanket is deteriorated, the flocs of the sludge blanket are quickly re-flocculated by the flocculation modifier. As a result, the coagulation state of the sludge blanket is restored, and the treated water can be maintained in good quality. As described above, the water quality of the treated water can be stabilized regardless of the aggregation state of the sludge blanket.

The coagulation-sedimentation treatment apparatus 100 includes a reaction tank 20 for reacting raw water and a coagulation adjusting agent, and a switching unit 50 for switching the supply destination of the coagulation adjusting agent by the coagulation adjusting agent supply unit 120 . The switching unit 50 switches the supply destination of the aggregation modifier from the reaction tank 20 to the supply line L50 based on the aggregation state of the sludge blanket. As a result, in the normal operation state, the aggregation adjusting agent supply unit 120 supplies the aggregation adjusting agent to the reaction tank 20, and after sufficiently reacting the aggregation adjusting agent and the raw water in the reaction tank 20, It can be supplied to the sludge blanket section 12 . On the other hand, when the flocculation state of the sludge blanket deteriorates, the flocs of the sludge blanket can be rapidly re-flocculated by the flocculation modifier by switching the switching unit 50 .

The aggregation modifier is an inorganic coagulant, and the aggregation modifier supply unit 120 may supply the inorganic coagulant to the supply line L50. When the flocculation adjuster is supplied to the supply line L50, the flocculation adjuster can be uniformly supplied to the sludge blanket by the distributor 11 together with the raw water in the flocculation sedimentation tank 10 .

The invention is not limited to the embodiments described above.

For example, a coagulation-sedimentation treatment apparatus 200 as shown in FIG. 2 may be employed. In the coagulation-sedimentation treatment apparatus 200 , an inorganic coagulant, which is a coagulation modifier, is directly supplied to the sludge blanket section 12 . This makes it possible to supply the flocculation control agent directly to the sludge blanket. In this way, by directly adding the flocculation modifier to the sludge blanket, the sludge in the sludge blanket can be immediately recoagulated, so that the operation can be performed without deteriorating the treated water quality.

Specifically, the coagulation-sedimentation treatment apparatus 200 includes a line L8 that connects the switching section 50 to the sludge blanket section 12 of the coagulation-sedimentation tank 10 . As a result, the inorganic flocculant supplying section 30 can supply the inorganic flocculant to the sludge blanket section 12 via the lines L6 and L8 by switching the switching section 50 .

For example, a coagulation-sedimentation treatment apparatus 300 as shown in FIG. 3 may be employed. In the coagulation-sedimentation treatment apparatus 300 , the coagulation adjusting agent supply section 120 may supply the inorganic coagulant to the upper layer of the sludge blanket section 12 . In this case, the agglomeration state near the upper layer of the sludge blanket can be recovered intensively. Here, when the state of flocculation deteriorates, flocs that have not been captured flow out together with the treated water from the upper layer of the sludge blanket. Therefore, by intensively recovering the aggregation state near the upper layer of the sludge blanket, it is possible to quickly prevent small flocs from flowing out.

Specifically, the coagulation-sedimentation treatment apparatus 300 includes a line L13 that connects the switching section 50 to the upper layer of the sludge blanket section 12 of the coagulation-sedimentation tank 10 . In addition, the coagulating sedimentation treatment apparatus 300 includes a line L10 connected to the polymer flocculant supply unit 40, a line L11 branching from the line L10 to the line L2, a line L12 extending from the line L10 to the upper layer of the sludge blanket, and a switching unit 60 connected to the lines L10, L11, and L12. Accordingly, the inorganic flocculant supply section 30 can supply the inorganic flocculant to the upper layer section of the sludge blanket section 12 through the lines L6 and L13 by switching the switching section 50 . Further, the polymer flocculant supply unit 40 can supply the polymer flocculant to the upper layer portion of the sludge blanket unit 12 through the lines L10 and L12 by switching the switching unit 60 .

For example, a coagulation-sedimentation treatment apparatus 400 as shown in FIG. 4 may be employed. In the coagulation-sedimentation treatment apparatus 400, a pH adjuster is employed as the coagulation adjuster. Thus, by adjusting the pH of the sludge blanket, the flocculation can be indirectly improved. The coagulating sedimentation treatment apparatus 400 also includes a detector 80 capable of detecting the state of coagulation of the sludge blanket. The detector 80 is, for example, a turbidity meter, and the sensor 81 is placed in the clarification zone several hundred mm above the sludge blanket interface (100 to 500 mm), and the turbidity at that position is measured to determine the flocculation of the sludge blanket. state can be detected. Note that the supply amount of the aggregation modifier may be controlled according to the detection result of the detector 80 as described above.

Specifically, the coagulating sedimentation treatment apparatus 400 includes a pH adjuster supply unit 90 that supplies a pH adjuster, a line L20 connected to the pH adjuster supply unit 90, and a line branching from the line L20 to the reaction tank 20. L21, a line L22 extending from the line L20 to the sludge blanket portion 12, and a switching portion 70 connected to the lines L20, L21, and L22. That is, the aggregation adjuster supply section 120 is configured by the pH adjuster supply section 90 and the line L22 that supplies the pH adjuster to the supply line L50. Accordingly, the pH adjuster supply section 90 can supply the pH adjuster to the sludge blanket section 12 through the lines L20 and L22 by switching the switching section 70 .

Although FIGS. 1 to 4 exemplify the structure capable of recovering the aggregation state of the sludge blanket, some or all of the structures of FIGS. 1 to 4 may be combined.

Further, a mechanism may be provided that does not operate during normal operation and supplies the aggregation modifier to the aggregation modifier supply position 110 only at the timing of recovering the aggregation state of the sludge blanket.

DESCRIPTION OF SYMBOLS 10... Coagulation-sedimentation tank, 20... Reaction tank, 50,70... Switching part, 100,200,300,400... Coagulation-sedimentation processing apparatus, 120... Aggregation-adjusting agent supply part, L50... Supply line.

Claims (8)

a reactor for reacting the raw water and the aggregation adjusting agent;
a coagulating sedimentation tank comprising a sludge blanket part having a sludge blanket that traps solids contained in the water to be treated discharged from the reaction tank to generate treated water;
a detector for detecting the aggregation state of the sludge blanket;
a supply line for supplying the water to be treated to the sludge blanket portion of the coagulating sedimentation tank;
a flocculation modifier supply unit capable of supplying the flocculation modifier that improves the flocculation of the sludge blanket ;
with
The aggregation modifier supply unit includes a line that supplies the aggregation modifier to one of the supply line and the sludge blanket unit based on the aggregation state of the sludge blanket detected by the detector,
The coagulation-sedimentation treatment apparatus, wherein the detector detects the coagulation state in a region near the interface between the interface of the sludge blanket section and the water surface of the coagulation-sedimentation tank in the vertical direction. 2. The coagulation sedimentation treatment apparatus according to claim 1, wherein said detector detects said aggregation state between 100 and 500 mm above the interface of said sludge blanket. The coagulating sedimentation treatment apparatus according to claim 1 or 2, wherein the detector is a turbidity meter. a reaction tank for reacting the raw water and the aggregation modifier;
a switching unit for switching a supply destination of the aggregation modifier by the aggregation modifier supply unit;
4. The switching unit switches the supply destination of the aggregation modifier from the reaction tank to at least one of the supply line and the sludge blanket unit based on the aggregation state of the sludge blanket. The coagulation-sedimentation treatment apparatus according to item 1. The coagulation sedimentation treatment apparatus according to any one of claims 1 to 4, wherein the coagulation modifier is an inorganic coagulant. The coagulation-sedimentation treatment apparatus according to any one of claims 1 to 5, further comprising a polymer flocculant supply section, and supplying the polymer flocculant to at least one of the supply line and the sludge blanket section. The coagulating sedimentation treatment apparatus according to any one of claims 1 to 6, wherein the coagulation adjusting agent supply section supplies the coagulation adjusting agent to an upper layer portion of the sludge blanket section. In a coagulation-sedimentation treatment method for coagulating-sedimentation of the water to be treated in a coagulation-sedimentation tank having a sludge blanket part having a sludge blanket for generating treated water by capturing solids contained in the water to be treated,
a reaction step of reacting the raw water with the aggregation modifier;
a supply step of supplying the water to be treated discharged in the reaction step to the sludge blanket portion of the coagulating sedimentation tank;
a detection step of detecting the aggregation state of the sludge blanket;
a flocculation modifier supplying step capable of supplying a flocculation modifier that improves the flocculation of the sludge blanket,
In the aggregation adjusting agent supplying step, the aggregation adjusting agent is supplied to one of the water to be treated and the sludge blanket part based on the aggregation state of the sludge blanket detected in the detecting step,
The coagulation-sedimentation treatment method, wherein in the detection step, the coagulation state is detected in a region near the interface between the interface of the sludge blanket portion and the water surface of the coagulation-sedimentation tank in the vertical direction.

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