JP2018103064A - Muddy water treatment apparatus and muddy water treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbid water treatment apparatus and a turbid water treatment method capable of rapidly solid-liquid separation of turbid water containing a suspended solid in a space-saving manner. SOLUTION: A turbid water treatment apparatus 1 stores a mixing stirrer 30 that mixes a liquid water-soluble liquid coagulant Lg that agglomerates a suspended substance with turbid water D, and turbid water D in which the treatment agent is mixed by the mixing stirrer 30. It was composed of a discharge water tank 40 for precipitating agglomerates (flocs) agglomerated by the liquid coagulant Lg. [Selection diagram] Fig. 1

Description

  The present invention relates to, for example, a turbid water treatment apparatus and a turbid water treatment method for precipitating suspended substances, which are impurities contained in turbid water, and separating them into solid and liquid.

  Conventionally, for example, in construction work such as tunnel construction and concrete structure dismantling work, a large amount of high-concentration muddy water and muddy water such as drainage is generated. Since such turbid water contains a large amount of impurities, that is, suspended substances, it cannot be discharged as it is, and is subjected to a solid-liquid separation process and discharged with satisfying a predetermined discharge standard. . Such solid-liquid separation treatment is used not only in the civil engineering / architecture field, but also in a wide range of fields ranging from wastewater / waste liquid treatment in production processes such as the food industry and chemical industry.

  Such turbid water treatment methods and treatment equipment can be used depending on the nature and purpose of the suspended matter to be treated, such as centrifuges such as decanter type and separator plate type, centrifugal filtration type, vacuum filtration type, or pressure filtration. Various methods and apparatuses such as a filter such as a mold or a squeeze type press are used.

  For example, the muddy water treatment apparatus and muddy water treatment method described in Patent Document 1 are one of them. The turbid water treatment apparatus and the turbid water treatment method described in Patent Document 1 measure the degree of suspension of wastewater, add a predetermined amount of an inorganic powder flocculant according to the measured degree of suspension, and discharge the wastewater and inorganic powder. The aggregating agent is agitated and mixed (hereinafter referred to as mixing agitation), and the precipitated agglomerate is delivered.

  However, in this way, the inorganic powder flocculant is added to the wastewater that is muddy water, and the wastewater and the inorganic powder flocculant are mixed and stirred to aggregate the suspended matter. Large-scale tanks and water tanks are required to mix and agitate the mixture and to precipitate aggregates (floc) containing suspended substances, which increases the overall size of the device and takes time for processing. there were.

JP 2002-336602 A

  Therefore, an object of the present invention is to provide a turbid water treatment apparatus and a turbid water treatment method capable of quickly and solid-liquid separating turbid water containing suspended solids in a space-saving manner.

  The present invention is provided with a mixer for mixing a liquid water-soluble liquid flocculant for aggregating a suspended substance into turbid water, and the liquid flocculated in the turbid water mixed with the treatment agent in the mixer is agglomerated by the liquid flocculant. It is a muddy water treatment device for precipitating a precipitate.

  Alternatively, the present invention provides a mixing step of mixing a liquid water-soluble liquid flocculant for aggregating a suspended substance with turbid water in a mixer, and the liquid flocculant in the turbid water in which the treatment agent is mixed in the mixer. It is a muddy water treatment method which performs the precipitation process which precipitates the aggregated precipitate.

The liquid flocculant may be in the form of a gel as long as it is not liquid but is a water-soluble fluid that is not powder.
The muddy water may be sewage, waste water, waste liquid or treated water containing suspended substances.
The precipitate is an aggregate of suspended solids and is also called floc.

According to the present invention, turbid water containing suspended solids can be rapidly solid-liquid separated in a space-saving manner.
More specifically, by mixing a water-soluble liquid flocculant with turbid water in a mixer, the turbid water and the processing agent can be quickly and efficiently compared with the case where a powdered processing agent is added to the turbid water and mixed. Can be mixed. Therefore, the aggregating action of the suspended substance is rapidly and efficiently exhibited, and the aggregate (floc) in which the suspended substance is aggregated can be rapidly precipitated as a precipitate and separated into solid and liquid.

  In addition, since the aggregating action of the suspended substance is rapidly and efficiently exhibited, and the aggregate (floc) in which the suspended substance is aggregated can be rapidly precipitated as a precipitate, the aggregate ( Compared with a turbid water treatment apparatus that cannot rapidly precipitate (floc), a compact apparatus configuration may be used, and space saving can be achieved.

  As an aspect of the present invention, the mixer has a columnar mixing space inside, and the liquid flocculant and the turbid water are respectively supplied from a crossing direction intersecting with a radiation direction in plan view at a lower portion of the columnar mixing space. A lower inflow portion for inflow and an upper outflow portion for allowing the turbid water mixed with the liquid flocculant to flow out from the upper portion of the mixing space may be provided.

  According to the present invention, due to the inflow energy of the muddy water that flows into the columnar mixing space from the crossing direction, a vortex (swirl flow) from the lower inflow portion toward the upper outflow portion, that is, from below to above in the mixing space. ), And the turbid water and the liquid flocculant can be efficiently and reliably mixed and stirred in the mixing space by the vortex (swirl flow).

  In this way, the turbid water and the liquid flocculant are mixed in the mixing space by the vortex (swirl flow) generated from the lower side to the upper side caused by the inflow energy of the turbid water into the columnar mixing space. A separate mechanism and energy for mixing turbid water and the liquid flocculant are not required, and a more compact and simple turbid water treatment apparatus can be configured.

As an aspect of the present invention, the liquid flocculant may be a cationic polymer flocculant solution and an anionic polymer flocculant solution.
The cationic polymer flocculant solution is a solution of a polymer flocculant having a cation group in the molecule, and the anionic polymer flocculant solution is a solution of a polymer flocculant having an anion group in the molecule. . More specifically, the polymer flocculant having a cationic group is a methacrylic ester-based polymer flocculant or an acrylate-based polymer flocculant, and the anionic polymer flocculant solution is a carboxylic acid-based polymer flocculant. Molecular flocculants and sulfonic acid-based polymer flocculants.

  The above-mentioned liquid flocculant, which is a cationic polymer flocculant solution and an anionic polymer flocculant solution, is a mixture of a cationic polymer flocculant solution and an anionic polymer flocculant solution. Alternatively, two liquids of a cationic polymer flocculant solution and an anionic polymer flocculant solution may be mixed with turbid water.

According to this invention, muddy water can be solid-liquid separated more quickly.
More specifically, particles of suspended substances (hereinafter referred to as suspended particles) contained in the turbid water are repelled by negative charges on the particle surfaces, or the surfaces are covered with a water film. Since the distance between them is too large, the suspended particles cannot be agglomerated for the reason that no attractive force acts on the suspended particles.

  In such a situation, by adding polyaluminum chloride (PAC), which is a cation (positive), the surface charge of the suspended particles is neutralized, or the water film covering the suspended particle surface is removed. As a result, the inter-particle distance between the suspended particles is reduced, and an attractive force acts on the suspended particles to bond the particles, that is, the suspended particles are easily aggregated and precipitated. This is called a coagulation action.

  However, the aggregate due to the above-mentioned condensation action is too fine to be sufficiently precipitated. Therefore, by adding the polymer flocculant, the suspended particles can be bonded with a strong force to form a large aggregate (floc) by the cross-linking adsorption action of the polymer flocculant. This is referred to as cross-linking adsorption-flocculation.

  In contrast, the liquid flocculant, which is a cationic polymer flocculant solution and an anionic polymer flocculant solution, is a cationic polymer flocculant that is a cation and an anionic high polymer flocculant that is an anion. Since the molecular aggregating agent is mixed and agitated at once, the charged particles are neutralized, coagulated, and cross-linked by adsorption-aggregation, resulting in higher bond strength and larger aggregates (floc). Can be formed. Therefore, since aggregates (floc) can be rapidly precipitated, turbid water can be more solid-liquid separated.

As an aspect of the present invention, a plurality of the mixers may be provided.
The plurality of mixers may be arranged in series or in parallel, or may be arranged in an appropriate arrangement such that some are arranged in series and the rest are arranged in parallel.

According to the present invention, the amount of turbid water treated and the mixing distance between the turbid water and the liquid flocculant can be set appropriately, and the pH adjustment can be performed more reliably by adding the turbid water to solid-liquid separation or solid-liquid separation. can do.
In addition, if a plurality of mixers of the same type are provided, the pH is adjusted in addition to appropriate solid-liquid separation or solid-liquid separation according to the degree of treatment without preparing mixers of various capacities and shapes. be able to.

Moreover, the aspect of this invention WHEREIN: The sedimentation tank which stores the said muddy water liquid with which the said process chemical | medical agent was mixed with the said mixer may be provided.
According to the present invention, agglomerates (floc) can be more reliably formed and precipitated, and turbid water can be solid-liquid separated more quickly.

  Further, as an aspect of the present invention, a pH adjuster supply pump that supplies a liquid pH adjuster to the mixer, a flocculant supply pump that supplies the liquid coagulant to the mixer, and a pH in the precipitation tank. A pH measuring means for measuring, at least the pH adjusting agent supply pump, and the pH measuring means may be connected, and a controller that controls at least the operation of the pH adjusting agent supply pump may be provided.

According to this invention, according to the nature and suspension degree of the turbid water, an appropriate amount of a liquid pH adjuster and a liquid flocculant can be mixed with the turbid water for solid-liquid separation and appropriate pH adjustment.
Specifically, since the liquid coagulant is a liquid pH adjuster and a liquid coagulant, appropriate amounts of the liquid pH adjuster and the liquid coagulant are mixed with the muddy water, respectively, according to the properties and suspending degree of the muddy water. Solid-liquid separation and appropriate pH adjustment.

  In addition, at least the pH adjusting agent supply pump and the control unit to which the pH measuring unit is connected control at least the operation of the pH adjusting agent supply pump. Since the liquid pH adjuster can be mixed with the turbid water, the pH of the turbid water can be adjusted appropriately.

  According to the present invention, it is possible to provide a turbid water treatment apparatus and a turbid water treatment method capable of quickly and solid-liquid separating turbid water containing a suspended substance in a space-saving manner.

The schematic block diagram of a muddy water processing apparatus. The perspective view of a mixing stirrer. Explanatory drawing of a mixing stirrer. Explanatory drawing of arrangement | positioning of a mixing stirrer.

An embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a schematic configuration diagram of the turbid water treatment apparatus 1, FIG. 2 is a perspective view of the mixing stirrer 30, and FIG.

  Specifically, FIG. 2 is a perspective view of the mixing stirrer 30, but illustrates a mixing space K inside by cutting away a part of the front side. FIG. 3A shows a plan sectional view of the lower portion of the mixing stirrer 30, and FIG. 3B shows a plan sectional view of the lower portion of the mixing stirrer 30 of another embodiment. Note that FIG. 3B is shown in a reduced scale compared to FIG.

The turbid water treatment apparatus 1 includes a control unit 10, a turbid water tank 20, a mixing agitator 30, a discharge water tank 40, a pH chemical tank 50, and a flocculant tank 60 (60a, 60b).
The control unit 10 is a control operation panel that includes a CPU and a memory (not shown), and includes switches for performing various operations.

  The turbid water tank 20 is a tank that stores turbid water D containing suspended solids from an unillustrated turbid water pipe. Inside the turbid water tank 20, a first pH sensor 21 for measuring the pH value of the stored turbid water D and a turbid water pump 22 for sending the turbid water D through a turbid water pipe 23 to a mixing stirrer 30 to be described later are arranged. Yes.

  The mixing stirrer 30 has a cylindrical shape having a mixing space K therein, and is connected to a muddy water pipe 23 and drug pipes 52 and 62 (62a and 62b) described later at the lower part, and treated muddy water D1 is described at the upper part. A discharge pipe 31 that discharges toward the discharge water tank 40 is connected.

  The mixing stirrer 30 to which the muddy water pipe 23 and the chemical pipes 52, 62 a, 62 b are connected will be described in detail with reference to FIGS. 2 and 3. The muddy water pipe 23 connected to the lower part of the mixing stirrer 30 is connected to the mixing space K. They are connected in a direction that intersects the radial direction in the plan view direction. Specifically, as shown in FIG. 3A, the muddy water pipes 23 facing in the radial direction in the plan view direction are connected while being shifted in a direction orthogonal to the radial direction. That is, the muddy water pipe 23 is connected in a substantially tangential direction.

  Moreover, the chemical | medical agent piping 62 (62a, 62b) connected to the coagulant | flocculant supply pump 61 (61a, 61b) of the coagulant | flocculant tank 60 (60a, 60b) is the above-mentioned muddy water piping 23 and the mixing space K in the planar view direction. A drug pipe 52 connected to the pH adjusting agent supply pump 51 of the pH drug tank 50 and connected at a point-symmetrical position and orientation with respect to the center is connected to the drug pipe 62 above the drug pipe 62 (62a, 62b). Connected in the same direction. That is, the medicine pipe 52, the medicine pipe 62b, and the medicine pipe 62a are arranged in order from the top.

In the mixing space K, a discharge pipe 31 that discharges from the mixing space K as a treated muddy water D1 in which a drug and muddy water D described later are mixed and stirred is connected to the mixing stirrer 30 in the same direction as the muddy water pipe 23 described above. .
The muddy water pipe 23 is formed with a larger diameter than the drug pipe 52 and the drug pipe 62.

  The discharge water tank 40 is a water tank that stores the treated muddy water D1 discharged from the mixing stirrer 30 through the discharge pipe 31, and includes a precipitation part 40a that stores the treated muddy water D1, and a supernatant part that stores the solid water-separated supernatant water D2. 40b is partitioned in this order from the upstream side by the partition plate 41, and the supernatant water D2 is discharged from the supernatant 40b. The discharge water tank 40 is also called a thickener.

  In addition, the 2nd pH sensor 42 which measures the pH value of the treated muddy water D1 is arrange | positioned at the sedimentation part 40a of the discharge water tank 40, and the 3rd pH which measures the pH value of the supernatant water D2 at the supernatant part 40b of the discharge water tank 40. A sensor 43 is arranged.

  The pH chemical tank 50 that stores the liquid pH adjuster Lp is provided with a pH adjuster supply pump 51 that sends the liquid pH adjuster Lp to the mixing and agitating device 30 via the drug pipe 52. In this embodiment, a 60% citric acid solution is used as the liquid pH adjuster Lp stored in the pH drug tank 50.

  The flocculant tank 60 that stores the liquid flocculant Lg is provided with a flocculant supply pump 61 that sends the liquid flocculant Lg to the mixing stirrer 30 via the drug pipe 62. Specifically, in the present embodiment, the coagulant tank 60a contains a cationic polymer coagulant solution Lga, and the coagulant tank 60b contains an anionic polymer coagulant solution Lgb. .

  More specifically, the cationic polymer flocculant solution Lga is a water-soluble polymer flocculant having a cationic group, such as a methacrylic ester-based polymer flocculant or an acrylate-based polymer flocculant. Can be configured. The anionic polymer flocculant solution Lgb is a water-soluble polymer flocculant having an anion group, and is a carboxylic acid polymer flocculant or a sulfonic acid polymer flocculant.

In the turbid water treatment apparatus 1 configured as described above, the first pH sensor 21, the turbid water pump 22, the second pH sensor 42, the third pH sensor 43, the pH adjusting agent supply pump 51, and the flocculant supply pump 61 are connected to the control unit 10. Being controlled by the control unit 10,
Specifically, the control unit 10 determines the turbid water pump 22, the pH adjusting agent supply pump 51, and the flocculant supply pump 61 (61a, 61b) according to the measurement results of the first pH sensor 21, the second pH sensor 42, and the third pH sensor 43. Is controlling the operation.

Subsequently, solid-liquid separation and pH adjustment of the turbid water D using the turbid water treatment apparatus 1 will be described.
In this embodiment, a case where solid water separation and pH adjustment are performed using water drilled by concrete drilling or the like as muddy water D will be described. Such hole water contains alkaline suspended solids and exhibits alkalinity.

  First, the pH value of the turbid water D stored in the turbid water tank 20 is measured by the first pH sensor 21. Based on the pH value of the turbid water D measured by the first pH sensor 21, the control unit 10 determines the amount of the liquid pH adjuster Lp to be mixed with the turbid water D, and based on the determined amount of the liquid pH adjuster Lp, The pump 22, the pH adjusting agent supply pump 51, and the flocculant supply pump 61 (61a, 61b) are operated.

  When the turbid water pump 22 is operated under the control of the control unit 10, the turbid water D is supplied to the mixing agitator 30 through the turbid water pipe 23. Similarly, when the pH adjusting agent supply pump 51 is operated under the control of the control unit 10, the liquid pH adjusting agent Lp is supplied to the mixing agitator 30 through the drug pipe 52, and the flocculant supply pump 61 is controlled under the control of the control unit 10. (61a, 61b) is operated, and the liquid flocculant Lg (Lga, Lgb) is supplied to the mixing stirrer 30 through the chemical pipe 62 (62a, 62b), and in the mixing space K, the turbid water D, the liquid pH adjuster. Lp and liquid flocculant Lg (Lga, Lgb) are mixed and stirred (mixing step).

  More specifically, the turbid water pipe 23 is connected to the mixing space K in the lower direction of the mixing stirrer 30 in a direction crossing the radial direction in the plan view direction, so that the turbid water supplied to the mixing stirrer 30 is In the mixing space K of the mixing stirrer 30, D rises while turning as shown in FIGS. That is, the turbid water D generates a vortex (swirl flow) in the mixing space K of the mixing stirrer 30.

  Similarly to the muddy water pipe 23, the medicine pipe 52 and the medicine pipe 62 (62 a, 62 b) are also directed toward the direction intersecting the radial direction in the plan view direction with respect to the mixing space K at the lower part of the mixing stirrer 30. The liquid pH adjuster Lp and the liquid flocculant Lg (Lga, Lgb) that are connected and supplied to the mixing stirrer 30 through the chemical pipe 52 and the chemical pipe 62 (62a, 62b) are mixed in the mixing stirrer 30. At K, it is added to the turbid water D rising while swirling.

  The liquid pH adjuster Lp and the liquid flocculant Lg (Lga, Lgb) added to the turbid water D in which the vortex (swirl flow) is generated are mixed and stirred with the turbid water D in the mixing space K, and the liquid pH adjuster Lp is added to the turbid water D. And Lg (Lga, Lgb) are mixed and discharged from the discharge pipe 31 as the treated muddy water D1 whose pH is adjusted by the liquid pH adjuster Lp, and stored in the settling portion 40a of the discharge water tank 40.

  The treated turbid water D1 stored in the sedimentation part 40a aggregates suspended substances by the liquid coagulant Lg (Lga, Lgb), forms aggregates (floc), and precipitates (precipitation process). In this way, the pH value of the treated muddy water D1 in which aggregates (floc) are formed and precipitated is measured by the second pH sensor 42.

  When the pH value of the treated muddy water D1 measured by the second pH sensor 42 satisfies a predetermined releasable pH value, the control unit 10 determines that the addition amount of the liquid pH adjuster Lp is appropriate, and the pH The operating state of the regulator supply pump 51 is maintained. Conversely, when the pH value of the treated muddy water D1 measured by the second pH sensor 42 does not satisfy the predetermined pH value that can be released, the control unit 10 determines that the amount of liquid pH adjuster Lp added is small. The operation of the pH adjusting agent supply pump 51 is controlled so that the amount of the liquid pH adjusting agent Lp added to the turbid water D increases.

  By repeating such treatment, the amount of treated turbid water D1 stored in the sedimentation section 40a increases and overflows the partition plate 41. At this time, the aggregated matter in which suspended substances aggregate in the treated turbid water D1 ( Flocs) precipitate, that is, the supernatant water D2 separated into solid and liquid overflows the partition plate 41 and is stored in the supernatant 40b.

  Then, when the pH value of the supernatant water D2 stored in the supernatant portion 40b is measured by the third pH sensor 43 and it is confirmed that the predetermined pH value that can be released is satisfied, the supernatant water D2 is obtained from the supernatant portion 40b. Release. Conversely, when the pH value of the supernatant water D2 stored in the supernatant portion 40b does not satisfy the predetermined pH value that can be released, the discharge of the supernatant water D2 stored in the supernatant portion 40b is stopped, and the muddy water pump The operating amount of the pH adjuster supply pump 51 is increased while the operating amount of 22 is reduced.

  That is, the amount of liquid pH adjuster Lp added to a small amount of turbid water D is increased. In this way, since the treated turbid water D1 in which the addition amount of the liquid pH adjuster Lp is increased is stored in the sedimentation portion 40a, the pH value of the supernatant water D2 overflowing the partition plate 41 becomes acidic, so that the supernatant portion 40b The pH value of the stored supernatant water D2 can be adjusted to a predetermined releasable pH value.

  As described above, the turbid water treatment apparatus 1 is provided with the mixing stirrer 30 that mixes the liquid water-soluble liquid flocculant Lg (Lga, Lgb) for aggregating the suspended solids with the turbid water D. In order to precipitate the aggregate (floc) aggregated by the liquid coagulant Lg (Lga, Lgb) from the turbid water D mixed with (Lga, Lgb), the turbid water D containing the suspended solids is quickly solidified in a space-saving manner. Liquid separation can be performed.

  More specifically, in the mixing stirrer 30, by mixing the water-soluble liquid flocculant Lg (Lga, Lgb) with the turbid water D, the powdered treatment agent is added to the turbid water D and mixed more quickly. And the muddy water D and a process chemical | medical agent can be mixed efficiently. Therefore, the flocculating action of the suspended substance is rapidly and efficiently exhibited, and the aggregate (floc) in which the suspended substance is aggregated can be quickly precipitated and solid-liquid separated.

  In addition, since the aggregating action of the suspended substance is quickly and efficiently exhibited and the aggregated substance (floc) in which the suspended substance is aggregated can be rapidly precipitated, the aggregated substance (floc) is not efficiently aggregated. Compared to a turbid water treatment apparatus that cannot perform rapid sedimentation, a compact apparatus configuration may be used, and space saving can be achieved.

  Moreover, the discharge water tank which stores the processing muddy water D1 which mixed liquid coagulant Lg (Lga, Lgb) with muddy water D with the mixing stirrer 30, and precipitates the aggregate (floc) aggregated with the liquid coagulant Lg (Lga, Lgb). 40 is provided, the aggregate (floc) is more reliably formed and precipitated, and the muddy water D can be solid-liquid separated more quickly.

  Further, the mixing stirrer 30 has a columnar mixing space K inside, and a liquid flocculant Lg (Lga, Lgb) and muddy water D from the crossing direction intersecting the radiation direction in plan view at the lower part of the columnar mixing space K. Since the turbid water pipe 23 and the chemical pipe 62 (62a, 62b) and the discharge pipe 31 through which the treated turbid water D1 flows out from the upper part of the mixing space K are provided, it flows into the columnar mixing space K from the crossing direction. Due to the inflow energy of the muddy water D to be generated, in the mixing space K, a vortex (swirl flow) from the muddy water pipe 23, the drug pipe 52 and the drug pipe 62 (62 a, 62 b) toward the discharge pipe 31, that is, from below to above is generated. The turbid water D and the liquid flocculant Lg (Lga, Lgb) can be efficiently and reliably mixed in the mixing space K by the vortex (swirl flow).

  In addition, the turbid water D and the liquid flocculant Lg (Lga, Lgb) are mixed in the mixing space K by a vortex (swirl flow) generated by the inflow energy of the turbid water D into the columnar mixing space K in this way. Therefore, another mechanism and energy for mixing the turbid water D and the liquid flocculant Lg (Lga, Lgb) are not required, and a more compact and simple turbid water treatment apparatus 1 can be configured.

  Further, a pH adjusting agent supply pump 51 for supplying the liquid pH adjusting agent Lp to the mixing stirrer 30 and a flocculant supplying pump 61 (61a, 61b) for supplying the liquid flocculant Lg (Lga, Lgb) to the mixing stirrer 30. ), A second pH sensor 42 for measuring pH in the discharge water tank 40, a pH adjusting agent supply pump 51, and a second pH sensor 42 are connected at least, and the controller 10 for controlling the operation of at least the pH adjusting agent supply pump 51 is provided. Therefore, depending on the nature and suspension degree of muddy water D, appropriate amounts of liquid pH adjuster Lp and liquid flocculant Lg (Lga, Lgb) are mixed with muddy water D to perform solid-liquid separation and appropriately adjust pH. be able to.

Specifically, depending on the nature and suspension degree of muddy water D, appropriate amounts of liquid pH adjuster Lp and liquid flocculant Lg (Lga, Lgb) may be mixed with muddy water D to perform solid-liquid separation and appropriate pH adjustment. it can.
In addition, since the control unit 10 to which at least the pH adjusting agent supply pump 51 and the second pH sensor 42 are connected controls at least the operation of the pH adjusting agent supply pump 51, an amount corresponding to the measurement result by the second pH sensor 42. Since the liquid pH adjuster Lp can be mixed with the turbid water D, the pH of the turbid water D can be adjusted appropriately.

  Further, since the cationic polymer flocculant solution Lga and the anionic polymer flocculant solution Lgb are used as the liquid flocculant Lg (Lga, Lgb), the cationic polymer flocculant which is a cation and The anionic polymer flocculant which is an anion is mixed and stirred at one time, resulting in the charge neutralizing action, the coagulation action and the cross-linking adsorption-aggregation action on the surface of the suspended particles. Larger aggregates (floc) can be formed. Therefore, the muddy water D can be solid-liquid separated more quickly.

  Furthermore, since the flocculant supply pump 61 and the drug pipe 62 are provided independently for the two liquids of the cationic polymer flocculant solution Lga and the anionic polymer flocculant solution Lgb, depending on the properties of the turbid water D, Can adjust the mixing amount of the cationic polymer flocculant solution Lga and the anionic polymer flocculant solution Lgb, and can perform solid-liquid separation more reliably and quickly.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment, the liquid flocculant of the present invention corresponds to the liquid flocculant Lg (Lga, Lgb).
Muddy water corresponds to muddy water D,
The mixer corresponds to the mixing stirrer 30,
Precipitates correspond to agglomerates (floc)
The settling tank corresponds to the discharge water tank 40,
The muddy water treatment device corresponds to the muddy water treatment device 1,
The mixing space corresponds to the mixing space K,
The lower inflow portion corresponds to the muddy water pipe 23, the drug pipe 52, and the drug pipe 62 (62a, 62b),
The muddy water mixed with the liquid flocculant corresponds to the treated muddy water D1,
The upper outflow part corresponds to the discharge pipe 31,
The liquid pH adjuster corresponds to the liquid pH adjuster Lp,
The pH adjusting agent supply pump corresponds to the pH adjusting agent supply pump 51,
The flocculant supply pump corresponds to the flocculant supply pump 61 (61a, 61b),
The pH measuring means corresponds to the second pH sensor 42,
Although a control part respond | corresponds to the control part 10, it is not limited to the said embodiment.

  In the above description, one mixing stirrer 30 is provided in the turbid water treatment apparatus 1, but a plurality of mixing stirrers 30 may be provided depending on the properties and the suspension degree of the turbid water D or the amount of treatment of the turbid water D. Good. In this case, as shown in FIG. 4A, all of the plurality of mixing stirrers 30 may be arranged in series or in parallel. Furthermore, as shown in FIG.4 (b), some mixing stirrers 30 may be arranged in series, and the remaining mixing stirrers 30 may be arranged in parallel.

In this way, by providing a plurality of mixing stirrers 30 in the turbid water treatment device 1, the amount of turbid water D treated and the mixing distance between the turbid water D and the liquid flocculant Lg (mixing in which the turbid water D and the liquid flocculant Lg are mixed) Space distance) can be set appropriately, and turbid water D can be solid-liquid separated and pH adjusted more reliably.
Further, when a plurality of the same type of mixing stirrer 30 are provided, solid-liquid separation and pH adjustment can be appropriately performed according to the degree of treatment without preparing mixing stirrers 30 of various capacities and shapes.

  In the above description, the muddy water treatment apparatus 1 is provided with the discharge water tank 40, the treated muddy water D1 obtained by mixing the liquid flocculant Lg (Lga, Lgb) with the muddy water D with the mixing stirrer 30 is stored, and the liquid flocculant Lg (Lga) is stored. , Lgb), the aggregate (floc) aggregated is precipitated, but the liquid aggregating agent Lg (Lga, Lgb) is mixed in the turbid water D without the discharge water tank 40 and mixed with the liquid aggregating agent Lg (Lga, Lgb). You may precipitate the aggregate (floc) aggregated by Lga, Lgb).

  In particular, when the inflow rate of the turbid water D to the mixing stirrer 30 is slow, that is, when the processing speed is not high, it is preferable that aggregates (floc) are easily precipitated in the mixing stirrer 30. In addition, when the processing amount of the turbid water D is large, or when the aggregate (floc) is surely precipitated in the mixing stirrer 30 for solid-liquid separation, a plurality of the mixing stirrers 30 are arranged in parallel as described above. And / or in series.

  In the above description, two coagulant tanks 60 and two coagulant supply pumps 61 are provided, and two chemical pipes 62 (62a, 62b) are provided for the mixing agitator 30 as shown in FIGS. ), And the controller 10 controls the operation of the flocculant supply pump 61 to mix two liquids of the cationic polymer flocculant solution Lga and the anionic polymer flocculant solution Lgb into the turbid water D, respectively. However, a mixed solution obtained by mixing the cationic polymer flocculant solution Lga and the anionic polymer flocculant solution Lgb may be mixed with the turbid water D.

  Further, the control unit 10 determines the amount of the liquid pH adjuster Lp to be mixed with the muddy water D based on the pH value of the muddy water D measured by the first pH sensor 21, and based on the determined amount of the liquid pH adjuster Lp. The pH adjusting agent supply pump 51 is operated, the pH value of the treated muddy water D1 stored in the sedimentation part 40a is measured by the second pH sensor 42, and the pH value of the supernatant water D2 stored in the supernatant part 40b is the first value. Based on the result measured by the 3 pH sensor 43, the operating amount of the pH adjuster supply pump 51 was feedback controlled by the control unit 10, but the pH value of the turbid water D measured by the first pH sensor 21 was measured by the second pH sensor 42. Based on the pH value of the treated muddy water D1 or the pH value of the supernatant water D2 measured by the third pH sensor 43, the amount of the liquid pH adjuster Lp to be manually mixed with the muddy water D is determined, and the pH The operation amount of Seizai feed pump 51 may be controlled by operating the control unit 10.

  Furthermore, in the above description, the drug pipe 52 is connected to the upper part of the drug pipe 62 (62a, 62b) in the lower part of the mixing stirrer 30, but as shown in FIG. Four of the two drug pipes 62 (62a, 62b) and the drug pipe 52 may be connected in substantially the same cross-sectional shape. In this case, the muddy water pipe 23, the medicine pipe 62 (62a, 62b), and the medicine pipe 52 may be arranged evenly in the circumferential direction.

DESCRIPTION OF SYMBOLS 1 ... Turbid water treatment apparatus 10 ... Control part 23 ... Turbid water piping 30 ... Mixing stirrer 31 ... Discharge piping 40 ... Discharge water tank 42 ... 2nd pH sensor 51 ... pH adjuster supply pump 52 ... Drug piping 61 ... Flocculant supply pump 62 ... Drug Pipe D ... Muddy water D1 ... Processed muddy water K ... Mixing space Lg ... Liquid flocculant Lp ... Liquid pH adjuster

Claims (8)

A mixer for mixing a liquid water-soluble liquid flocculant for aggregating the suspended solids with turbid water is provided, and in the turbid water mixed with the treatment agent in the mixer, a precipitate aggregated by the liquid flocculant is precipitated. A muddy water treatment device. The mixer is
While having a columnar mixed space inside,
A lower inflow portion for allowing the liquid flocculant and the turbid water to flow in from a crossing direction intersecting the radial direction of radiation in a lower portion of the columnar mixing space, and turbid water mixed with the liquid flocculant in the mixing space. The turbid water treatment apparatus according to claim 1, further comprising an upper outflow portion that flows out from an upper portion. The muddy water treatment apparatus according to claim 1 or 2, wherein the liquid flocculant is a cationic polymer flocculant solution Lga and an anionic polymer flocculant solution Lgb. The muddy water treatment apparatus according to any one of claims 1 to 3, wherein a plurality of the mixers are provided. The muddy water treatment apparatus in any one of Claims 1 thru | or 4 provided with the sedimentation tank which stores the said muddy water liquid with which the said process chemical | medical agent was mixed with the said mixer. A pH adjuster supply pump for supplying a liquid pH adjuster to the mixer;
A flocculant supply pump for supplying the liquid flocculant to the mixer;
PH measuring means for measuring pH in the settling tank,
The muddy water treatment apparatus according to claim 5, wherein at least the pH adjusting agent supply pump and the pH measuring unit are connected, and a control unit that controls at least the operation of the pH adjusting agent supply pump is provided. A mixing step of mixing a liquid water-soluble liquid flocculant for agglomerating suspended solids with turbid water in a mixer;
A turbid water treatment method comprising: a precipitation step of precipitating a precipitate aggregated by the liquid coagulant in the turbid water mixed with the treatment chemical by the mixer. The mixer is
While having a columnar mixed space inside,
A lower inflow portion for allowing the liquid flocculant and the turbid water to flow in from a crossing direction intersecting the radial direction of radiation in a lower portion of the columnar mixing space, and turbid water mixed with the liquid flocculant in the mixing space. The turbid water treatment method according to claim 7, further comprising an upper outflow portion that flows out from the upper portion.

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