Coagulation condition control device, coagulation condition control method, coagulation separation processing system, and coagulation separation processing method

Abstract

To provide a flocculating condition control device that can decide and control the flocculating conditions in the flocculation separation treatment in a short time.SOLUTION: A flocculating condition control device 5 decides and controls the flocculating conditions in a flocculation separation treatment device 9 with a mixing device 50, a flock forming device 52 and a separation device 54. The flocculating condition control device 5 includes: evaluating flocculant addition piping 22 for adding the evaluating flocculant in a portion of the treated water; a solid-liquid separation device 10 for consecutively passing the treated water with the evaluating flocculant added therein, and separating the flock formed by the evaluating flocculation using the evaluating flocculant; a water quality measurement device 12 for measuring water quality of the evaluating treated water; and a control device 14 for changing condition values by 2 or more about at least one of the conditions of the evaluating flocculation, dividing a flocculating state by the case from the relationship between the changed condition value and the treated water quality measured by treated water quality measuring means, and controlling the flocculating conditions by the control amount decided previously in each case.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an aggregation condition control device for controlling aggregation conditions in an aggregation treatment, an aggregation condition control method, and an aggregation separation treatment system and an aggregation separation treatment method that use the aggregation condition control device and the aggregation condition control method. [Background technology]

[0002] In water treatment, a flocculating agent such as an inorganic flocculating agent or a polymer flocculating agent is added to water to be treated to flocculate suspended solids and the like to form flocs, which are then separated into solid and liquid.

[0003] Conventionally, the flocculation conditions in the flocculation and separation process have been determined by a test (jar test) to determine the optimum amount of flocculant to be added for flocculation and solid-liquid separation using a test device called a jar tester equipped with multiple stirring blades whose rotation speed can be controlled. Also, an auto jar tester that automates this jar test is known (for example, see Patent Document 1).

[0004] The problem with an automatic jar tester is that the number of parts increases with the number of conditions, making it difficult to maintain and uneconomical.In addition, although a jar tester can test four to six conditions simultaneously, it is a batch process, and one test usually requires a total of 30 minutes or more for mixing the coagulant, forming flocs, settling and separating by gravity, and measuring the quality of the treated water.

[0005] In actual coagulation and separation treatment, when coagulation conditions are determined by a jar test according to the quality of the treated water, if there is a sudden change in the quality of the treated water, a time lag occurs in the jar test, which takes a total of 30 minutes or more, and the system is unable to keep up with the sudden change in the quality of the treated water, which may result in a deterioration in the quality of the treated water. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2009-000672 A Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide an agglomeration condition control device that can determine and control the agglomeration conditions in a coagulation separation process in a short period of time, an agglomeration condition control method, a coagulation separation process system that uses the agglomeration condition control device and the coagulation condition control method, and a coagulation separation process method. [Means for solving the problem]

[0008] The present invention provides a coagulation condition control device for determining and controlling coagulation conditions in a coagulation separation treatment device comprising a mixing means for mixing the water to be treated with a coagulant, a flocculation forming means for forming flocs in the mixed liquid, and a separation means for separating the water into concentrated water containing the formed flocs and treated water, the coagulation condition control device comprising: an evaluation coagulant adding means for adding an evaluation coagulant to a part of the water to be treated; a solid-liquid separation means for continuously passing the water to be treated to which the evaluation coagulant has been added, and separating the flocs formed by evaluation coagulation using the evaluation coagulant; a treated water quality measuring means for measuring the water quality of the evaluation treated water obtained by the solid-liquid separation means; and a control unit for changing two or more condition values ​​for at least one of the conditions for the evaluation coagulation, classifying the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured by the treated water quality measuring means, and controlling the coagulation condition by a control amount determined in advance for each case.

[0009] In the flocculation condition control device, the condition for the evaluation flocculation is preferably at least one of the amount of the evaluation flocculant added, the flocculation pH in the evaluation flocculation, and the stirring strength in the evaluation flocculation.

[0010] It is preferable that the aggregation condition control device further comprises a display means for displaying the relationship.

[0011] In the coagulation condition control device, it is preferable that the coagulation separation treatment device further includes a treated water quality measuring means for measuring the water quality of the treated water, the coagulation condition control device further includes a database for recording the water quality of the treated water, the relationship, and the control variable, and the control unit corrects the control variable based on the water quality of the treated water.

[0012] In the coagulation condition control device, the control unit classifies the coagulation state into an appropriate coagulation state, an excessive coagulation state, and an insufficient coagulation state based on a relationship between first to nth condition values ​​(where n is an integer of 2 or more) for one of the conditions for evaluation coagulation and a treated water quality obtained by the evaluation coagulation performed with the first condition value and a treated water quality obtained by the evaluation coagulation performed with the nth condition value; in the case of the appropriate coagulation state, the coagulation condition is maintained; and in the case of the excessive coagulation state, the control unit classifies the coagulation state into an appropriate coagulation state, an excessive coagulation state, and an insufficient coagulation state based on a relationship between the treated water quality obtained by the evaluation coagulation performed with the nth condition value and a treated water quality obtained by the evaluation coagulation performed with the nth condition value; , reducing the amount of flocculant added, lowering the pH, and lowering the stirring intensity. A negative control is performed, and in the case of the under-aggregation state, the aggregation conditions are At least one of increasing the amount of flocculant added, increasing the pH, and increasing the stirring intensity. It is preferable to carry out a positive control.

[0013] The present invention is a coagulation condition control method for determining and controlling coagulation conditions in a coagulation and separation treatment method including a mixing step of mixing water to be treated with a coagulant, a flocculation formation step of forming flocs in the mixed liquid, and a separation step of separating the liquid into concentrated water containing the formed flocs and treated water, the coagulation condition control method including: an evaluation coagulant addition step of adding an evaluation coagulant to a part of the water to be treated; a solid-liquid separation step of continuously passing the water to be treated to which the evaluation coagulant has been added, and separating the flocs formed by evaluation coagulation using the evaluation coagulant; a treated water quality measurement step of measuring the water quality of evaluation treated water obtained by the solid-liquid separation step; and a control step of changing two or more condition values ​​for at least one of the conditions for evaluation coagulation, classifying the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured by the treated water quality measurement step, and controlling the coagulation conditions by a control amount determined in advance for each case.

[0014] In the method for controlling flocculation conditions, the condition for the evaluation flocculation is preferably at least one of the amount of the flocculant for evaluation added, the flocculation pH in the evaluation flocculation, and the stirring strength in the evaluation flocculation.

[0015] It is preferable that the aggregation condition control method further includes a display step of displaying the relationship on a display means.

[0016] In the coagulation condition control method, it is preferable that the coagulation and separation treatment method further includes a water quality measurement process for measuring the water quality of the water to be treated, and in the coagulation condition control method, the control variable is corrected based on the water quality of the water to be treated using a database that records the water quality of the water to be treated, the relationship, and the control variable.

[0017] In the control step of the coagulation condition control method, the coagulation state is classified into an appropriate coagulation state, an excessive coagulation state, and an insufficient coagulation state based on the relationship between first to nth condition values ​​(where n is an integer of 2 or more) for one of the conditions for the evaluation coagulation and the treated water quality obtained by the evaluation coagulation performed with the first condition value and the treated water quality obtained by the evaluation coagulation performed with the nth condition value; in the case of the appropriate coagulation state, the coagulation condition is maintained, and in the case of the excessive coagulation state, the coagulation condition is classified into an appropriate coagulation state, an excessive coagulation state, and an insufficient coagulation state based on the relationship between the treated water quality obtained by the evaluation coagulation performed with the nth condition value and the treated water quality obtained by the evaluation coagulation performed with the nth condition value. , reducing the amount of flocculant added, lowering the pH, and lowering the stirring intensity. A negative control is performed, and in the case of the under-aggregation state, the aggregation conditions are At least one of increasing the amount of flocculant added, increasing the pH, and increasing the stirring intensity. It is preferable to carry out a positive control.

[0018] The present invention provides a coagulation and separation treatment system comprising: a mixing means for mixing water to be treated with a coagulant, a flocculating means for forming flocs in the mixed liquid, and a separation means for separating the liquid into concentrated water containing the formed flocs and treated water; and a coagulation condition control device for determining and controlling coagulation conditions in the coagulation and separation treatment device, wherein the coagulation condition control device comprises: an evaluation coagulant adding means for adding an evaluation coagulant to a part of the water to be treated; a solid-liquid separation means for continuously passing the water to be treated to which the evaluation coagulant has been added, and separating the flocs formed by evaluation coagulation with the evaluation coagulant; a treated water quality measuring means for measuring the water quality of evaluation treated water obtained by the solid-liquid separation means; and a control unit for changing two or more condition values ​​for at least one of the conditions for evaluation coagulation, classifying the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured by the treated water quality measuring means, and controlling the coagulation conditions by a control amount predetermined for each case.

[0019] The present invention is a coagulation and separation treatment method including: a mixing step of mixing water to be treated with a coagulant, a flocculation formation step of forming flocs in the mixed liquid, and a separation step of separating the liquid into concentrated water containing the formed flocs and treated water; and a coagulation condition control step of determining and controlling coagulation conditions in the coagulation and separation treatment step, the coagulation condition control step including: an evaluation coagulant addition step of adding an evaluation coagulant to a part of the water to be treated; a solid-liquid separation step of continuously passing the water to be treated to which the evaluation coagulant has been added, and separating the flocs formed by evaluation coagulation with the evaluation coagulant; a treated water quality measurement step of measuring the water quality of evaluation treated water obtained by the solid-liquid separation step; and a control step of changing two or more condition values ​​for at least one of the conditions for evaluation coagulation, classifying the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured in the treated water quality measurement step, and controlling the coagulation conditions by a control amount predetermined for each case. Effect of the Invention

[0020] The present invention can provide an agglomeration condition control device that can determine and control the agglomeration conditions in a coagulation separation process in a short period of time, an agglomeration condition control method, an agglomeration separation process system that uses the agglomeration condition control device and the agglomeration condition control method, and an agglomeration separation process method. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic configuration diagram showing an example of an aggregation / separation processing system equipped with an aggregation condition control device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic configuration diagram showing another example of an aggregation / separation processing system including an aggregation condition control device according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic configuration diagram showing another example of an aggregation / separation processing system including an aggregation condition control device according to an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic configuration diagram showing another example of an aggregation / separation processing system including an aggregation condition control device according to an embodiment of the present invention. [Diagram 5] 4 is a flowchart showing an example of control in the aggregation condition control device according to the embodiment of the present invention. [Figure 6] 1 is a graph showing the results of control in Example 1 and Comparative Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes an embodiment of the present invention. The embodiment is merely an example of implementing the present invention, and the present invention is not limited to the embodiment.

[0023] FIG. 1 shows an outline of an example of a flocculation / separation treatment system equipped with an apparatus for controlling flocculation conditions according to an embodiment of the present invention, and the configuration thereof will be described.

[0024] The coagulation separation treatment system 1 includes a coagulation separation treatment device 9 and a coagulation condition control device 5 for determining and controlling the coagulation conditions in the coagulation separation treatment device 9.

[0025] The flocculation and separation treatment device 9 includes a mixer 50 as a mixing means for mixing the water to be treated with a flocculant, a flocculation device 52 as a flocculation means for forming flocs in the mixed liquid, and a separation device 54 as a separation means for separating the formed flocs into concentrated water containing the flocs and treated water.

[0026] The coagulation condition control device 5 comprises an evaluation coagulant addition pipe 22 as an evaluation coagulant adding means for adding an evaluation coagulant to a portion of the water to be treated, a solid-liquid separation device 10 as a solid-liquid separation means for continuously passing the water to be treated to which the evaluation coagulant has been added and separating flocs formed by evaluation coagulation using the evaluation coagulant, a water quality measuring device 12 as treated water quality measuring means for measuring the water quality of the evaluation treated water obtained by the solid-liquid separation device 10, and a control device 14 as a control unit that changes two or more condition values ​​for at least one of the conditions for evaluation coagulation, classifies the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured by the water quality measuring device 12, and controls the coagulation conditions by a control amount predetermined for each case.

[0027] In the coagulation and separation treatment system 1 of Fig. 1, a treated water pipe 56 is connected to the inlet of the mixer 50. The outlet of the mixer 50 and the inlet of the flocculation device 52 are connected by a mixed liquid pipe 58. The outlet of the flocculation device 52 and the inlet of the separation device 54 are connected by a coagulation liquid pipe 60. A treated water pipe 62 is connected to the outlet of the separation device 54. A coagulant addition pipe 64 is connected to the mixer 50 as a coagulant addition means for adding a coagulant to the treated water.

[0028] The treated water pipe 16 branched from the treated water pipe 56 is connected to the inlet of the solid-liquid separation device 10. The outlet of the solid-liquid separation device 10 and the inlet of the water quality measuring device 12 are connected by an evaluation treated water pipe 18. An evaluation treated water pipe 20 is connected to the outlet of the water quality measuring device 12. An evaluation flocculant addition pipe 22 is connected to the treated water pipe 16. The control device 14 is connected to the water quality measuring device 12, a flocculant addition amount adjustment means (not shown) that adjusts the amount of flocculant added, which is installed in the flocculant addition pipe 64, and an evaluation flocculant addition amount adjustment means (not shown) that adjusts the amount of flocculant added, which is installed in the evaluation flocculant addition pipe 22, by electrical connections or the like.

[0029] The flocculation separation treatment method and the operation of the flocculation separation treatment system 1, the flocculation condition control method and the operation of the flocculation condition control device 5 according to this embodiment will be described.

[0030] In the coagulation / separation treatment system 1 of Fig. 1, for example, water to be treated containing suspended solids and the like is sent through the water to be treated pipe 56 to the mixer 50, where a coagulant is added to the water to be treated through the coagulant addition pipe 64 and mixed (mixing step). The mixed liquid is sent through the mixed liquid pipe 58 to the flocculation device 52, where flocs are formed (flocculation step). The coagulation liquid is sent through the coagulation liquid pipe 60 to the separation device 54, where solid-liquid separation is performed by gravity settling, filtration, and the like, and the water is separated into concentrated water and treated water (separation step). The treated water is discharged through the treated water pipe 62. The concentrated water is discharged through the concentrated water pipe.

[0031] Meanwhile, the water to be treated branched off from the water to be treated pipe 56 is sent to the solid-liquid separation device 10 through the water to be treated pipe 16. Here, in the water to be treated pipe 16, the evaluation flocculant is added to the water to be treated through the evaluation flocculant addition pipe 22 (evaluation flocculant addition step), the flocculant and the water to be treated are stirred and mixed (evaluation mixing step), and fine flocs formed by mixing and flocculation of the evaluation flocculant and the water to be treated (evaluation flocculation) collide with each other, causing the particle size of the flocs to grow (evaluation floc formation step). The evaluation flocculation liquid containing the flocs is sent to the solid-liquid separation device 10 through the water to be treated pipe 16.

[0032] The flocculated liquid for evaluation is continuously passed through solid-liquid separation device 10, where it is separated into treated water for evaluation and concentrated water for evaluation (solid-liquid separation process) (the above is the flocculation and separation process for evaluation). The treated water for evaluation is sent to water quality measuring device 12 through treated water for evaluation piping 18, and the water quality of the treated water for evaluation is measured by water quality measuring device 12 (treated water quality measuring process). The treated water for evaluation is discharged through treated water for evaluation piping 20. The concentrated water for evaluation is discharged through concentrated water for evaluation piping.

[0033] In the coagulation condition control device 5, the control device 14 automatically changes two or more condition values ​​for at least one of the coagulation conditions for evaluation during the process of passing the coagulation liquid for evaluation through the solid-liquid separation device 10, classifies the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured by the water quality measuring device 12, and controls the coagulation conditions in the coagulation separation treatment device 9 using a control amount predetermined for each case (control process).

[0034] For example, for one of the evaluation flocculation conditions, the flocculation state is classified into an appropriate flocculation state, an excessive flocculation state, and an insufficient flocculation state based on the relationship between the first to nth condition values ​​(where n is an integer of 2 or greater) and the treated water quality obtained by evaluation flocculation performed with the first condition value to the treated water quality obtained by evaluation flocculation performed with the nth condition value.In the case of the appropriate flocculation state, the flocculation conditions are maintained, while in the case of the excessive flocculation state, negative control is performed on the flocculation conditions, and in the case of the insufficient flocculation state, positive control is performed on the flocculation conditions.

[0035] FIG. 5 shows a flowchart of an example of control in the coagulation condition control method and the coagulation condition control device according to the present embodiment. For example, for one of the conditions for evaluation coagulation (for example, the amount of flocculant added for evaluation, the coagulation pH for evaluation, and the stirring strength for evaluation coagulation), water is passed through the evaluation treated water under a first condition value, solid-liquid separation is performed, and the treated water quality for evaluation is measured (S10). This is repeated until a predetermined number (n) of conditions are completed, water is passed through the evaluation treated water under the nth condition value, solid-liquid separation is performed, and the treated water quality for evaluation is measured (S12). Data of the condition values ​​1 to n versus the treated water quality 1 to n are plotted, respectively, to clarify the relationship (S14). The coagulation state is classified into an appropriate coagulation state, an excessive coagulation state, and an insufficient coagulation state based on the amount of change in the treated water quality when the condition value for evaluation coagulation is changed (S16). In the case of an excessive flocculation state, negative control is performed on the flocculation conditions (S18), in the case of an appropriate flocculation state, the flocculation conditions are maintained (S20), and in the case of an insufficient flocculation state, positive control is performed on the flocculation conditions (S22). The above operations are repeated a predetermined number of times, and the operation is terminated when the actual machine approaches the appropriate conditions.

[0036] For example, in the control step, the condition values ​​for the evaluation flocculation conditions are changed, including at least one actual machine condition. As the evaluation flocculation conditions, for example, two or more condition values ​​for the amount of flocculant added for evaluation are changed. For example, the amount of flocculant added for evaluation is changed to the amount of flocculant added in the flocculation separation treatment device 9 of the actual machine (first condition value) and to an amount that is greater than or less than the amount of flocculant added in the flocculation separation treatment device 9 of the actual machine (second condition value). The amount of flocculant added for evaluation may be changed to the amount of flocculant added in the flocculation separation treatment device 9 of the actual machine (first condition value), to an amount that is greater than the amount of flocculant added in the flocculation separation treatment device 9 of the actual machine (second condition value), or to an amount that is less than the amount of flocculant added in the flocculation separation treatment device 9 of the actual machine (third condition value). The water quality of the evaluation treated water obtained for each condition value is measured by the water quality measuring device 12, and a relationship between the amount of flocculant added and the quality of the evaluation treated water is obtained. From this relationship, it is determined whether the flocculant is in an excessive, appropriate, or insufficient state.

[0037] In the case of n=2, for example, the water quality of the evaluation treated water at an amount of flocculant added in the actual flocculant separation treatment device 9 (first condition value) is compared with the water quality of the evaluation treated water at an amount of flocculant added that is greater or less than the amount added in the actual flocculant separation treatment device 9 (second condition value), and if there is little improvement in the water quality and the amount of improvement is less than a predetermined lower limit B, it is judged to be in an "excessive flocculation state." If the water quality improves and the amount of improvement exceeds a predetermined upper limit A, it is judged to be in an "insufficient flocculation state." If the water quality improves and the amount of improvement is greater than or equal to the predetermined lower limit B and less than or equal to the upper limit A, it is judged to be in an "adequate flocculation state."

[0038] When n=3, for example, the water quality of the evaluation treated water at an amount of flocculant added in the actual coagulation separation treatment device 9 (first condition value) is compared with the water quality of the evaluation treated water at an amount of flocculant added that is greater than the amount added in the actual coagulation separation treatment device 9 (second condition value), and if the water quality improves and the improvement exceeds a predetermined value C, and if the water quality improves and the improvement exceeds a predetermined value C, the water quality of the evaluation treated water at the amount added in the actual device (first condition value) is compared with the water quality of the evaluation treated water at an amount of flocculant added that is less than the amount added in the actual coagulation separation treatment device 9 (third condition value), the water quality is judged to be in a "deficient coagulation state."

[0039] The water quality of the evaluation treated water at the amount of coagulant added in the actual coagulation separation treatment device 9 (first condition value) is compared with the water quality of the evaluation treated water at an amount added (second condition value) greater than the amount of coagulant added in the actual coagulation separation treatment device 9, and if there is little improvement in the water quality and the amount of improvement is below a predetermined value C, and the water quality of the evaluation treated water at the amount added (first condition value) of the actual device is compared with the water quality of the evaluation treated water at an amount added (third condition value) less than the amount of coagulant added in the actual coagulation separation treatment device 9, and if there is little improvement in the water quality and the amount of improvement is below the predetermined value C, it is judged to be in an "excessive coagulation state."

[0040] The water quality of the evaluation treated water at the amount of coagulant added in the actual coagulation separation treatment device 9 (first condition value) is compared with the water quality of the evaluation treated water at an amount added (second condition value) greater than the amount of coagulant added in the actual coagulation separation treatment device 9, and if there is little improvement in the water quality and the amount of improvement is less than a predetermined value C, and the water quality of the evaluation treated water at the amount added (first condition value) of the actual device is compared with the water quality of the evaluation treated water at an amount added (third condition value) less than the amount of coagulant added in the actual coagulation separation treatment device 9, and the water quality is improved and the amount of improvement exceeds the predetermined value C, it is judged to be in an "appropriate coagulation state."

[0041] If the state is excessive flocculation, the amount of flocculant added in the actual flocculation and separation treatment device 9 is reduced (negative control); if the state is appropriate flocculation, the amount of flocculant added in the actual flocculation and separation treatment device 9 is maintained; and if the state is insufficient flocculation, the amount of flocculant added in the actual flocculation and separation treatment device 9 is increased (positive control).

[0042] When two or more evaluation flocculation conditions are used, for example, the amount of flocculant added for evaluation, the flocculation pH in the evaluation flocculation, and the stirring strength in the evaluation flocculation, it is preferable to evaluate the effect of each evaluation flocculation condition using multiple regression analysis.

[0043] In the actual coagulation / separation treatment device 9, by passing water through the device while changing the coagulation conditions, the conditions will eventually approach the optimum conditions. If the quality of the water to be treated fluctuates, the coagulation conditions will be controlled accordingly.

[0044] By performing such control, the flocculation conditions in the flocculation separation treatment can be determined and controlled in a short time. Since the treatment is continuous, it can be completed in a short time, and the number of parts is smaller than that of an automatic jar tester, making it economical. The flocculation conditions in the flocculation separation treatment can be controlled online, and the optimal flocculation conditions can be determined continuously.

[0045] The evaluation coagulation conditions to be changed may be any coagulation conditions that affect the treated water quality in the actual coagulation and separation treatment device 9, and are not particularly limited. Examples include the amount of evaluation coagulant added, the coagulation pH in the evaluation coagulation, and the stirring strength in the evaluation coagulation.

[0046] The number n of condition values ​​to be changed is 2 or more, preferably 3 or more. However, since the time until the evaluation result is output increases as the number of conditions increases, it is desirable to set the number appropriately according to the fluctuation range and fluctuation speed of the water quality to be treated. For example, during rainfall such as a typhoon or a sudden downpour, the turbidity of the water to be treated increases rapidly, so 2 to 4 conditions are preferable to follow the optimal coagulation conditions. Since the water quality to be treated does not fluctuate much under normal circumstances, the conditions may be set to, for example, 4 to 6 conditions to improve the accuracy of the evaluation. It is preferable that at least one of the condition values ​​includes the actual machine condition. The actual machine condition is, for example, the coagulant injection rate, coagulation pH, stirring strength, etc.

[0047] The solid-liquid separation device 10 is not particularly limited as long as it can continuously pass the water to be treated to which the evaluation flocculant has been added and separate the flocs formed by the evaluation flocculation using the evaluation flocculant. For example, a settling tank, a filter, a centrifugal separator, a separation cell using hydrodynamics, etc. can be mentioned. The solid-liquid separation device 10 may have a flow path including a wall surface having a curvature, for example, a curved channel in which a pipe having a flow path including a wall surface having a curvature is formed in a spiral shape. It is preferable that the separation method is such that the tendency of the water quality of the treated water against the flocculation conditions matches that of the actual flocculation separation treatment device 9. In the solid-liquid separation device 10, the inflow of the water to be treated into the solid-liquid separation device, the solid-liquid separation treatment, and the outflow of the treated water from the solid-liquid separation device are continuously performed.

[0048] The water quality measuring device 12 is not particularly limited as long as it is capable of measuring the water quality of the evaluation treated water, but it is, for example, a device that measures at least one of turbidity, color, organic matter concentration, particle size, and particle size distribution.

[0049] The mixing device 50 may be, for example, a mixing tank.

[0050] The flocculation device 52 may be, for example, a flocculation tank.

[0051] The separator 54 may be, for example, a separator that performs sedimentation separation by gravity, solid-liquid separation by filtration, or the like.

[0052] As the flocculant and the flocculant for evaluation, at least one of an inorganic flocculant and a polymer flocculant is used.

[0053] Examples of inorganic flocculants include iron-based inorganic flocculants such as ferric chloride and polyferric sulfate, and aluminum-based inorganic flocculants such as aluminum sulfate and polyaluminum chloride (PAC).

[0054] The amount of the inorganic flocculant added is, for example, in the range of 1 to 100 mg / L.

[0055] The polymer flocculant is not particularly limited to a nonionic polymer flocculant, an anionic polymer flocculant, or a cationic polymer flocculant, but examples thereof include polyacrylamide, sodium polyacrylate, acrylamide-acrylate copolymer, sodium acrylamidopropanesulfonate, chitosan, dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, and polyamidine. The polymer flocculant may be used alone or in combination of two or more.

[0056] The amount of the polymer flocculant added is, for example, in the range of 0.1 to 2 mg / L.

[0057] The liquid temperature in the flocculation and separation treatment (mixing step, floc formation step, and separation step) is not particularly limited and is, for example, in the range of 15 to 35° C. Since the separability varies depending on the viscosity, etc., it is desirable to adjust the liquid temperature as constant as possible.

[0058] The water to be treated is, for example, water containing suspended solids and the like, and examples thereof include river water, industrial water, and wastewater.

[0059] In the mixing step, the pH of the flocculation may be adjusted as necessary (pH adjustment step). The pH adjuster may be an acid such as hydrochloric acid or sulfuric acid, or an alkali such as sodium hydroxide. The pH of the flocculation may be adjusted to a range of 4 to 11, for example.

[0060] The coagulation separation treatment system 2 shown in FIG. 2 is a case where the coagulation pH is controlled.

[0061] The coagulation / separation treatment device 11 in the coagulation / separation treatment system 2 includes a mixer 50 as a mixing means for mixing the water to be treated with a coagulant, a flocculation device 52 as a flocculation forming means for forming flocs in the mixed liquid, and a separation device 54 as a separation means for separating the formed flocs into concentrated water containing the flocs and treated water.

[0062] The coagulation condition control device 6 includes an evaluation coagulant addition pipe 22 as an evaluation coagulant addition means for adding an evaluation coagulant to a portion of the water to be treated, an evaluation pH adjuster addition pipe 24 as an evaluation pH adjuster addition means for adding an evaluation pH adjuster to a portion of the water to be treated, a solid-liquid separation device 10 as a solid-liquid separation means for continuously passing the water to be treated to which the evaluation coagulant has been added and separating flocs formed by evaluation coagulation using the evaluation coagulant, a water quality measurement device 12 as a treated water quality measurement means for measuring the water quality of the evaluation treated water obtained by the solid-liquid separation device 10, and a control device 14 as a control unit that changes two or more condition values ​​for at least one of the conditions for evaluation coagulation, classifies the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured by the water quality measurement device 12, and controls the coagulation conditions by a control amount predetermined for each case.

[0063] In the coagulation / separation treatment system 2 of Fig. 2, a water to be treated pipe 56 is connected to the inlet of the mixer 50. An outlet of the mixer 50 and an inlet of the flocculation device 52 are connected by a mixed liquid pipe 58. An outlet of the flocculation device 52 and an inlet of the separation device 54 are connected by a coagulation liquid pipe 60. A treated water pipe 62 is connected to the outlet of the separation device 54. A coagulant addition pipe 64 as a coagulant addition means for adding a coagulant to the water to be treated, and a pH adjuster addition pipe 66 as a pH adjuster addition means for adding a pH adjuster to the water to be treated are connected to the mixer 50.

[0064] The treated water pipe 16 branched off from the treated water pipe 56 is connected to the inlet of the solid-liquid separation device 10. The outlet of the solid-liquid separation device 10 and the inlet of the water quality measuring device 12 are connected by an evaluation treated water pipe 18. An evaluation treated water pipe 20 is connected to the outlet of the water quality measuring device 12. An evaluation flocculant addition pipe 22 and an evaluation pH adjuster addition pipe 24 are connected to the treated water pipe 16. The control device 14 is connected, via electrical connections or the like, to the water quality measuring device 12, a flocculant addition amount adjustment means (not shown) installed in the flocculant addition piping 64 for adjusting the amount of flocculant added, a pH adjuster addition amount adjustment means (not shown) installed in the pH adjuster addition piping 66 for adjusting the amount of pH adjuster added, an evaluation flocculant addition amount adjustment means (not shown) installed in the evaluation flocculant addition piping 22 for adjusting the amount of evaluation flocculant added, and an evaluation pH adjuster addition amount adjustment means (not shown) installed in the evaluation pH adjuster addition piping 24 for adjusting the amount of evaluation pH adjuster added.

[0065] In the coagulation / separation treatment system 2 of FIG. 2, for example, water to be treated containing suspended solids and the like is sent to the mixer 50 through the water to be treated piping 56, and in the mixer 50, a coagulant is added to the water to be treated through the coagulant addition piping 64, and a pH adjuster is added through the pH adjuster addition piping 66, and mixed (mixing step). The mixed liquid is sent to the flocculation device 52 through the mixed liquid piping 58, and flocs are formed in the flocculation device 52 (flocculation step). The coagulation liquid is sent to the separation device 54 through the coagulation liquid piping 60, and in the separation device 54, solid-liquid separation is performed by gravity settling, filtration, and the like, and the water is separated into concentrated water and treated water (separation step). The treated water is discharged through the treated water piping 62. The concentrated water is discharged through the concentrated water piping.

[0066] Meanwhile, the water to be treated branched from the water to be treated pipe 56 is sent to the solid-liquid separation device 10 through the water to be treated pipe 16. Here, in the water to be treated pipe 16, the evaluation flocculant is added to the water to be treated through the evaluation flocculant addition pipe 22 (evaluation flocculant addition step), the evaluation pH adjuster is added to the water to be treated through the evaluation pH adjuster addition pipe 24 (evaluation pH adjuster addition step), the flocculant and the water to be treated are stirred and mixed (evaluation mixing step), and fine flocs formed by mixing and flocculation of the evaluation flocculant and the water to be treated (evaluation flocculation) collide with each other, and the particle size of the flocs grows (evaluation floc formation step). The evaluation flocculant containing the flocs is sent to the solid-liquid separation device 10 through the water to be treated pipe 16.

[0067] The flocculated liquid for evaluation is separated into treated water for evaluation and concentrated water for evaluation in the solid-liquid separation device 10 (solid-liquid separation process) (this is the flocculation and separation process for evaluation). The treated water for evaluation is sent to the water quality measuring device 12 through treated water for evaluation piping 18, and the water quality of the treated water for evaluation is measured by the water quality measuring device 12 (treated water quality measuring process). The treated water for evaluation is discharged through treated water for evaluation piping 20. The concentrated water for evaluation is discharged through concentrated water for evaluation piping.

[0068] In the coagulation condition control device 6, the control device 14 changes two or more condition values ​​for at least one of the evaluation coagulation conditions, classifies the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured by the water quality measuring device 12, and controls the coagulation conditions in the coagulation separation treatment device 9 using a control amount predetermined for each case (control process).

[0069] For example, in the control step, the condition values ​​for the evaluation flocculation conditions are changed, including at least one actual machine condition. As the evaluation flocculation conditions, for example, two or more condition values ​​for the flocculation pH in the evaluation flocculation are changed. The flocculation pH is changed to a pH in the actual flocculation separation treatment device 9 (first condition value) and a pH higher or lower than the pH in the actual flocculation separation treatment device 9 (second condition value). The flocculation pH may be changed to a pH in the actual flocculation separation treatment device 9 (first condition value), a pH higher than the pH in the actual flocculation separation treatment device 9 (second condition value), or a lower pH (third condition value). The water quality of the evaluation treated water obtained for each condition value is measured by the water quality measuring device 12, and the relationship between pH and evaluation treated water quality is obtained. From this relationship, it is determined whether the flocculant is in an excess, appropriate, or insufficient state, and if it is in an excessive flocculation state, the pH in the actual flocculation separation treatment device 9 is lowered (negative control), if it is in an appropriate flocculation state, the pH in the actual flocculation separation treatment device 9 is maintained, and if it is in an insufficient flocculation state, the pH in the actual flocculation separation treatment device 9 is raised (positive control).

[0070] When two or more evaluation coagulation conditions are used, it is preferable to evaluate the influence of each coagulation condition using multiple regression analysis. The width and control width of the evaluation coagulation conditions changed by the coagulation condition control device may be changed depending on the fluctuation width of the treated water quality. For example, if the fluctuation of the treated water turbidity is less than 10 degrees per hour, the test width is set to +5% and the control width is set to 2%, and if it is 10 degrees or more, the test width is set to 10% and the control width is set to 5%. This makes it possible to improve the tracking of the optimal coagulation conditions when the fluctuation of the treated water quality is large. The control width and the test width change control may be proportional to the water quality such as the treated water turbidity, for example, or may be determined in stages by determining a threshold value. In addition, it may be obtained from the displacement of the treated water turbidity obtained as a result of varying the test width. For example, when the amount of evaluation coagulant added is set to +5%, if the treated water turbidity is improved by 30% and improved by 10%, it can be considered that the deviation between the optimal coagulation conditions and the current conditions is larger in the case of the 30% improvement, so it is desirable to increase the control width. On the other hand, if the improvement in treated water turbidity when the amount of evaluation flocculant added becomes smaller, it means that the optimal flocculation conditions are close to the current conditions, and overshoot can be suppressed by narrowing the control range.

[0071] The coagulation / separation treatment system 3 shown in Fig. 3 includes a display device 26 as a display means for showing the relationship between the coagulation conditions and the treated water quality and the evaluation results, in addition to the configuration shown in Fig. 1. The control device 14 is connected to the display device 26 by electrical connection or the like.

[0072] The display device 26 displays, for example, a graph plotting the relationship between the amount of the evaluation flocculant added and the turbidity of the evaluation treated water, a graph plotting the turbidity of the treated water and the optimal addition rate, etc. If necessary, a graph plotting data such as the turbidity of the treated water of the actual machine and the color of the actual machine, etc. may be displayed. By providing the display device 26, for example, an operation manager can confirm what the current flocculation conditions are in the flocculation separation treatment device 9. For example, it can be confirmed whether the flocculation conditions in the flocculation separation treatment device 9 are significantly excessive, slightly excessive, appropriate with a certain margin, or only slightly appropriate, etc.

[0073] The display device 26 is not particularly limited as long as it can display information, and examples thereof include a liquid crystal display and an organic EL display.

[0074] The coagulation and separation treatment system 4 shown in Figure 4 further includes, in addition to the configuration of Figure 1, a water quality measuring means for measuring the water quality of the water to be treated, and a database for recording the water quality of the water to be treated, the above-mentioned relationships, control quantities, etc.

[0075] The coagulation and separation treatment device 13 in the coagulation and separation treatment system 4 includes a mixing device 50 as a mixing means for mixing the water to be treated with a coagulant, a flocculation device 52 as a flocculation forming means for forming flocs in the mixed liquid, a separation device 54 as a separation means for separating the water to be treated from concentrated water containing the formed flocs, and a treated water quality measuring device 68 as a treated water quality measuring means for measuring the water quality of the water to be treated.

[0076] The coagulation condition control device 8 comprises an evaluation coagulant addition pipe 22 as an evaluation coagulant adding means for adding an evaluation coagulant to a portion of the water to be treated, a solid-liquid separation device 10 as a solid-liquid separation means for continuously passing the water to be treated to which the evaluation coagulant has been added and separating flocs formed by evaluation coagulation using the evaluation coagulant, a water quality measuring device 12 as treated water quality measuring means for measuring the water quality of the evaluation treated water obtained by the solid-liquid separation device 10, a control device 14 as a control unit that changes two or more condition values ​​for at least one of the conditions for evaluation coagulation, classifies the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured by the water quality measuring device 12, and controls the coagulation conditions by a control amount determined in advance for each case, and a database 28 for recording the water quality of the water to be treated, the above-mentioned relationship, the control amount, etc.

[0077] In the coagulation and separation treatment system 4 of Fig. 4, a treated water pipe 70 is connected to the inlet of a treated water quality measuring device 68, and the outlet of the treated water quality measuring device 68 and the inlet of the mixer 50 are connected by a treated water pipe 56. The outlet of the mixer 50 and the inlet of the flocculation device 52 are connected by a mixed liquid pipe 58. The outlet of the flocculation device 52 and the inlet of the separator 54 are connected by a coagulation liquid pipe 60. A treated water pipe 62 is connected to the outlet of the separator 54. A coagulant addition pipe 64 is connected to the mixer 50 as a coagulant addition means for adding a coagulant to the treated water.

[0078] The treated water pipe 16 branched from the treated water pipe 56 is connected to the inlet of the solid-liquid separation device 10. The outlet of the solid-liquid separation device 10 and the inlet of the water quality measurement device 12 are connected by an evaluation treated water pipe 18. The outlet of the water quality measurement device 12 is connected to an evaluation treated water pipe 20. The treated water pipe 16 is connected to an evaluation flocculant addition pipe 22. The control device 14 is connected to the water quality measurement device 12, a flocculant addition amount adjustment means (not shown) that adjusts the amount of flocculant added, which is installed in the flocculant addition pipe 64, and an evaluation flocculant addition amount adjustment means (not shown) that adjusts the amount of flocculant added, which is installed in the evaluation flocculant addition pipe 22, by electrical connections or the like. The database 28 is connected to the control device 14 and the treated water quality measurement device 68, by electrical connections or the like.

[0079] In the coagulation / separation treatment system 4 in FIG. 4, for example, the water to be treated containing suspended solids and the like is sent through the pipe 70 to the water quality measuring device 68, and the water quality of the water to be treated is measured by the water quality measuring device 68 (water quality measuring step). The water to be treated is sent through the pipe 56 to the mixer 50, and in the mixer 50, a coagulant is added to the water to be treated through the coagulant addition pipe 64 (mixing step). The mixed liquid is sent through the mixed liquid pipe 58 to the flocculation device 52, where flocs are formed (flocculation step). The coagulant is sent through the coagulant pipe 60 to the separation device 54, where solid-liquid separation is performed by gravity sedimentation, filtration, and the like, and the water is separated into concentrated water and treated water (separation step). The treated water is discharged through the treated water pipe 62. The concentrated water is discharged through the concentrated water pipe.

[0080] Meanwhile, the water to be treated branched off from the water to be treated pipe 56 is sent to the solid-liquid separation device 10 through the water to be treated pipe 16. Here, in the water to be treated pipe 16, the evaluation flocculant is added to the water to be treated through the evaluation flocculant addition pipe 22 (evaluation flocculant addition step), the flocculant and the water to be treated are stirred and mixed (evaluation mixing step), and fine flocs formed by mixing and flocculation of the evaluation flocculant and the water to be treated (evaluation flocculation) collide with each other, causing the particle size of the flocs to grow (evaluation floc formation step). The evaluation flocculation liquid containing the flocs is sent to the solid-liquid separation device 10 through the water to be treated pipe 16.

[0081] The flocculated liquid for evaluation is separated into treated water for evaluation and concentrated water for evaluation in the solid-liquid separation device 10 (solid-liquid separation process) (this is the flocculation and separation process for evaluation). The treated water for evaluation is sent to the water quality measuring device 12 through treated water for evaluation piping 18, and the water quality of the treated water for evaluation is measured by the water quality measuring device 12 (treated water quality measuring process). The treated water for evaluation is discharged through treated water for evaluation piping 20. The concentrated water for evaluation is discharged through concentrated water for evaluation piping.

[0082] In the coagulation condition control device 8, the control device 14 changes two or more condition values ​​for at least one of the coagulation conditions for evaluation, classifies the coagulation state into cases based on the relationship between the changed condition value and the treated water quality measured by the water quality measuring device 12, and controls the coagulation conditions in the coagulation separation treatment device 9 using a control amount predetermined for each case (control process).

[0083] In the coagulation / separation treatment system 4, the database 28 is used to correct the control amount of the coagulation conditions of the actual coagulation / separation treatment device 13 based on the water quality of the water to be treated measured by the water quality measuring device 68.

[0084] The database 28 stores, for example, data on the quality of the water to be treated measured by the water quality measuring device 68, coagulation conditions, coagulation condition values ​​and the corresponding treated water quality data, and control amount data for the actual equipment at that time.

[0085] After sufficient data has been accumulated, the coagulation test conditions and the actual machine control amount according to the quality of the water to be treated are input to the control device 14. This makes it possible to shorten the time required to reach the optimum conditions when the water to be treated is similar to water that has been previously evaluated.

[0086] For example, when the turbidity of the water to be treated is 10 degrees, the amounts of evaluation flocculant added in cycle 1 of the control process are 5 ppm, 10 ppm, and 15 ppm. Because the turbidity was lowest when the amount added was 15 ppm, the amounts of evaluation flocculant added in cycle 2 are 10 ppm, 15 ppm, and 20 ppm, and because the turbidity is almost the same when the amount added is 15 ppm and 20 ppm, it is evaluated that the amount added of 15 ppm is optimal. This information is stored in database 28, and when water with a turbidity of 10 degrees is used as the water to be treated in the next coagulation treatment, the amounts of evaluation flocculant added of 10 ppm, 15 ppm, and 20 ppm can be set as the coagulation test conditions for cycle 1. EXAMPLES

[0087] EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0088] <Example 1> The treated water (raw water) was simulated water to which 10 ppm kaolin and 1 ppm humic acid were added as simulated substances. The amount of flocculant (polyaluminum chloride (PAC)) added to the flocculation condition control device was changed from condition (1) to condition (2) to condition (3) below, and turbidity data of the treated water was obtained using a turbidity meter (TC-100, manufactured by OPTEX) as a treated water quality measuring device. After each cycle, the relationship between the amount of PAC added and the turbidity of the treated water was evaluated, and the amount of PAC added to the actual flocculation and separation treatment device was controlled under the following control conditions. The results are shown in Figure 6.

[0089] [Control conditions] Amount of PAC added for evaluation Condition (1): Actual machine -5% Condition (2): Same amount added as in the actual machine Condition (3): Actual machine +5% Amount of PAC added in actual machine Insufficient cohesion and evaluation: Actual machine +2% Appropriate flocculation state and evaluation: No change in amount added Excessive flocculation state and evaluation: Actual machine -2%

[0090] <Comparative Example 1> Using a jar tester (MJS-6H, manufactured by Daido Kogyosho), the optimal amount of PAC to be added was determined each time the turbidity of the water to be treated fluctuated, and the amount of PAC added to the actual coagulation and separation treatment device was controlled. The results are shown in Figure 6.

[0091] In Comparative Example 1, the optimum amount of PAC added determined by the Jar Test (JT) increased due to an increase in the turbidity of the water to be treated. In Example 1, it was confirmed that the amount of PAC added followed the fluctuation in the turbidity of the water to be treated.

[0092] In this way, in the embodiment, the coagulation conditions in the coagulation separation treatment could be determined and controlled in a short time, and therefore, even if there was a sudden change in the water quality of the water to be treated, it was possible to follow it. [Explanation of symbols]

[0093] 1,2,3,4 Coagulation and separation treatment system, 5,6,7,8 Coagulation condition control device, 9,11,13 Coagulation and separation treatment device, 10 Solid-liquid separation device, 12 Water quality measuring device, 14 Control device, 16,56,70 Treated water piping, 18,20 Treated water piping for evaluation, 22 Coagulant addition piping for evaluation, 24 pH adjuster addition piping for evaluation, 26 Display device, 28 Database, 50 Mixing device, 52 Flocculation device, 54 Separation device, 58 Mixing liquid piping, 60 Coagulant piping, 62 Treated water piping, 64 Coagulant addition piping, 66 pH adjuster addition piping, 68 Treated water quality measuring device.

Claims

1. A flocculation condition control device for determining and controlling flocculation conditions in a flocculation and separation treatment device including a mixing means for mixing water to be treated with a flocculant, a flocculation forming means for forming flocs in the mixed liquid, and a separation means for separating the mixed liquid into a concentrated water containing the formed flocs and a treated water, comprising: The flocculation condition control device comprises: A flocculant addition means for adding a flocculant to be evaluated to a portion of the water to be treated; a solid-liquid separation means for continuously passing the treatment water to which the evaluation flocculant has been added and separating flocs formed by the evaluation flocculation using the evaluation flocculant; a treated water quality measuring means for measuring the water quality of the evaluation treated water obtained by the solid-liquid separation means; a control unit which changes two or more condition values ​​for at least one of the conditions for the evaluation flocculation, classifies the flocculation state into cases based on the relationship between the changed condition value and the treated water quality measured by the treated water quality measuring means, and controls the flocculation condition by a control amount determined in advance for each case; An agglomeration condition control device comprising:

2. The flocculation condition control device according to claim 1, The condition for the evaluation flocculation is at least one of an amount of the evaluation flocculant to be added, a flocculation pH in the evaluation flocculation, and a stirring strength in the evaluation flocculation.

3. The agglomeration condition control device according to claim 1 or 2, The apparatus for controlling aggregation conditions further comprises a display means for displaying the relationship.

4. The flocculation condition control device according to any one of claims 1 to 3, The coagulation and separation treatment device further includes a water quality measuring means for measuring the water quality of the water to be treated, The coagulation condition control device further includes a database for recording the water quality of the water to be treated, the relationship, and the control amount, The control unit corrects the control amount based on the water quality of the water to be treated.

5. The flocculation condition control device according to any one of claims 1 to 4, The control unit is For one of the conditions for the evaluation flocculation, the flocculation state is classified into an appropriate flocculation state, an excessive flocculation state, and an insufficient flocculation state based on the relationship between the first to nth condition values ​​(where n is an integer of 2 or more) and the treated water quality obtained by the evaluation flocculation performed under the first condition value and the treated water quality obtained by the evaluation flocculation performed under the nth condition value, In the case of the appropriate flocculation state, the flocculation conditions are maintained, In the case of the excessive flocculation state, at least one negative control of the flocculation conditions is performed, among reducing the amount of flocculant added, lowering the pH, and lowering the stirring strength; In the case of the insufficient flocculation state, the flocculation condition control device performs positive control of at least one of the following: increasing the amount of flocculant added, increasing the pH, and increasing the stirring strength.

6. A method for controlling flocculation conditions in a flocculation and separation treatment method including a mixing step of mixing water to be treated with a flocculant, a flocculation formation step of forming flocs in the mixed liquid, and a separation step of separating the mixed liquid into a concentrated water containing the formed flocs and treated water, comprising: The method for controlling aggregation conditions comprises: a step of adding a flocculant to be evaluated to a portion of the water to be treated; a solid-liquid separation step of continuously passing the treated water to which the evaluation flocculant has been added and separating flocs formed by the evaluation flocculation using the evaluation flocculant; a treated water quality measuring step for measuring the water quality of the treated water for evaluation obtained by the solid-liquid separation step; a control step of changing two or more condition values ​​for at least one of the conditions for the evaluation flocculation, classifying the flocculation state into cases based on the relationship between the changed condition value and the treated water quality measured in the treated water quality measuring step, and controlling the flocculation condition by a control amount that has been determined in advance for each case; A method for controlling agglomeration conditions, comprising:

7. The method for controlling agglomeration conditions according to claim 6, The flocculation condition control method, characterized in that the condition for the evaluation flocculation is at least one of the amount of the flocculant for evaluation added, the flocculation pH in the evaluation flocculation, and the stirring strength in the evaluation flocculation.

8. The method for controlling agglomeration conditions according to claim 6 or 7, The method for controlling an aggregation condition, further comprising a display step of displaying the relationship on a display means.

9. The method for controlling agglomeration conditions according to any one of claims 6 to 8, The coagulation and separation treatment method further includes a water quality measurement step of measuring the water quality of the water to be treated, The coagulation condition control method is characterized in that the control amount is corrected based on the water quality of the water to be treated using a database that records the water quality of the water to be treated, the relationship, and the control amount.

10. The method for controlling agglomeration conditions according to any one of claims 6 to 9, In the control step, For one of the conditions for the evaluation flocculation, the flocculation state is classified into an appropriate flocculation state, an excessive flocculation state, and an insufficient flocculation state based on the relationship between the first to nth condition values ​​(where n is an integer of 2 or more) and the treated water quality obtained by the evaluation flocculation performed under the first condition value and the treated water quality obtained by the evaluation flocculation performed under the nth condition value, In the case of the appropriate flocculation state, the flocculation conditions are maintained, In the case of the excessive flocculation state, at least one negative control of the flocculation conditions is performed, among reducing the amount of flocculant added, lowering the pH, and lowering the stirring strength; In the case of the insufficient flocculation state, the flocculation condition control method is characterized in that at least one positive control of the flocculation conditions is performed by increasing the amount of flocculant added, increasing the pH, and increasing the stirring strength.

11. A flocculation and separation treatment device including a mixing means for mixing the water to be treated with a flocculant, a flocculation forming means for forming flocs in the mixed liquid, and a separation means for separating the water into a concentrated water containing the formed flocs and a treated water; a flocculation condition control device for determining and controlling flocculation conditions in the flocculation and separation treatment device; Equipped with The flocculation condition control device comprises: A flocculant addition means for adding a flocculant to be evaluated to a portion of the water to be treated; a solid-liquid separation means for continuously passing the treatment water to which the evaluation flocculant has been added and separating flocs formed by the evaluation flocculation using the evaluation flocculant; a treated water quality measuring means for measuring the water quality of the evaluation treated water obtained by the solid-liquid separation means; a control unit which changes two or more condition values ​​for at least one of the conditions for the evaluation flocculation, classifies the flocculation state into cases based on the relationship between the changed condition value and the treated water quality measured by the treated water quality measuring means, and controls the flocculation condition by a control amount determined in advance for each case; A flocculation and separation treatment system comprising:

12. a flocculation and separation treatment process including a mixing process of mixing the water to be treated with a flocculant, a flocculation formation process of forming flocs in the mixed liquid, and a separation process of separating the mixed liquid into a concentrated water containing the formed flocs and a treated water; a flocculation condition control step of determining and controlling flocculation conditions in the flocculation and separation treatment step; Including, The agglomeration condition control step includes: a step of adding a flocculant to be evaluated to a portion of the water to be treated; a solid-liquid separation step of continuously passing the treated water to which the evaluation flocculant has been added and separating flocs formed by the evaluation flocculation using the evaluation flocculant; a treated water quality measuring step for measuring the water quality of the treated water for evaluation obtained by the solid-liquid separation step; a control step of changing two or more condition values ​​for at least one of the conditions for the evaluation flocculation, classifying the flocculation state into cases based on the relationship between the changed condition value and the treated water quality measured in the treated water quality measuring step, and controlling the flocculation condition by a control amount that has been determined in advance for each case; A method for flocculation and separation comprising the steps of:

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