JP2006281159A - Water treatment method and water treatment plant for water treatment plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce intermediate water corresponding to various uses.
SOLUTION: A plurality of water treatment devices 2-1 to 2-4, a sewage distribution device 3 that distributes inflow sewage 50 to each water treatment device, and a plurality of water treated by each water treatment device alone or in combination. The treated water distribution device 5 that distributes to the intermediate water uses A to C and the operation control device 30 are provided. The operation control device includes the predicted inflow sewage amount 31, the predicted water quality 32, the demand water amount 33 for the uses A to C, and Demand water quality 34 is input, and the treated water of each water treatment device is set alone or mixed to set the treated water amount and treated water quality of each water treatment device satisfying the demand water amount and the demanded water quality of uses AC. Calculate the operating cost and sludge generation amount of each water treatment device based on the set treated water amount and treated water quality, and treat the treated water amount and treated water quality of each water treatment device with the smallest calculated operating cost and sludge generation amount. The raw water distribution device based on the extracted treated water volume and treated water quality And control the operating conditions of each water treatment device and the treated water distribution device.
[Selection] Figure 1

Description

  The present invention relates to a water treatment method and apparatus, and more particularly, to a water treatment method and a water treatment plant for purifying sewage and producing reusable middle water or miscellaneous water.

  From the viewpoint of effective use of water resources, the reuse of middle water purified from urban sewage, industrial wastewater, rainwater, etc. is being carried out. For example, the middle water can be used as water for toilets, water for spraying, water for cooling, water for cooling, landscape water, agricultural water, industrial water, and raw water for waterworks. In this way, the sewage treatment plant that purifies the sewage is expected to have various uses, but because the water quality required for each use is different, a sewage treatment plant that produces sewage for multiple uses. Development is desired.

  In this regard, for example, Patent Document 1 proposes a support system for formulating a comprehensive water utilization system that can be used effectively and economically by linking water or rainwater that can be used as miscellaneous water with water. ing. According to this, it has two treatment facilities, a middle water treatment facility and a rainwater treatment facility, and selects which of the clean water and middle water to supply depending on the application, calculates the business cost in that case, and calculates the total water We plan to formulate a usage system plan.

JP-A-5-324601

  By the way, when producing middle water from sewage, for example, in the case of landscape water, it is required that the treated water is sufficiently decolored and deodorized, while in the case of agricultural water, decolorization and deodorization are not complete. However, it may be desired that organic matter, soluble phosphorus and soluble nitrogen remain.

  However, according to the technique described in Patent Document 1, it is possible to select whether to supply clean water or middle water for a specific application, but about producing a plurality of middle waters having different required water quality. Is not considered.

  Therefore, according to the technique described in Patent Document 1, it is necessary to operate a sewage treatment apparatus so as to produce the most clean required water quality because it is necessary to support a plurality of uses with one kind of middle water. There is. In that case, excessively clean middle water will be supplied for applications that do not require clean water quality. Usually, in sewage treatment, since the water quality and the amount of electric power or the amount of chemicals are in a trade-off relationship, it is wasteful in terms of energy and cost to supply excessively clean water. In addition, since the amount of sludge generated by the amount of purified intermediate water increases, sludge disposal costs also increase. On the contrary, if the quality of the middle water is lowered so as not to be wasted in terms of cost, it is not possible to obtain the middle water suitable for the use requiring a clean water quality.

  In addition, the demand for multiple sewage and the inflow of sewage, which is the raw water, vary depending on the season, the day of the week, and the time of day. Or conversely, there may be a shortage. Similarly, since the quality of the sewage inflow, which is the raw water, varies depending on the season, day of the week, and time, the quality of the middle water may be excessively purified or may not be sufficiently purified.

  An object of the present invention is to efficiently produce intermediate water corresponding to various uses.

  In order to solve the above-mentioned problems, the water treatment method and apparatus of the present invention distributes the inflowing raw water to a plurality of independent water treatment series, and mixes the treated water treated in each water treatment series to produce a plurality of demands. The present invention is characterized in that treated water corresponding to the amount of demand water and the quality of demand water is generated and supplied to each demand destination.

  According to the present invention, it is possible to effectively produce intermediate water corresponding to various uses.

  As an embodiment of the water treatment method of the present invention, by using a plurality of water treatment series, it is possible to obtain treated water of various treated water quality by changing the operating conditions of each water treatment series. As a result, a plurality of types of medium water having different required water qualities can be produced by individually or mixing the treated water of each water treatment series. As a result, since it is possible to supply each customer with intermediate water according to the required water quality, it is possible to avoid supplying excessively clean intermediate water. The operating cost can be reduced. Further, it is possible to avoid an increase in sludge disposal cost due to an increase in the amount of generated sludge.

  In this case, obtain at least one of the operation cost and sludge generation amount of a plurality of water treatment series, and set the treated water amount and treated water quality of each water treatment series to a value that minimizes at least one of the operation cost and sludge generation amount. It is preferable to define. According to this, it is possible to minimize the operating cost and sludge generation amount related to the production of plural kinds of middle water.

  In addition, the raw water that is introduced is distributed and processed into a plurality of independent water treatment series, and each of the water treatment series treated water alone or mixed to satisfy the demand water quantity and the demand water quality of the plurality of demand destinations. A treatment water amount and a treatment water quality of the water treatment series are set, and at least one of an operating cost and a sludge generation amount of each water treatment series is set based on the set treatment water amount and the treatment water quality of each water treatment series. Calculate and operate each water treatment series based on the treated water amount and treated water quality of each water treatment series that minimizes at least one of the calculated operating cost and the generated sludge amount, and each water treatment series These treated waters can be configured to be supplied to the plurality of demand customers alone or in combination.

  Also, in this case, a reservoir is provided for temporarily storing treated water to be supplied to the customer, and the amount of treated water for each water treatment system is set by taking into account that the water is stored in the reservoir. The amount of treated water in each water treatment series can be averaged by absorbing the fluctuations of

  Furthermore, each water treatment system has activated sludge treatment and ozone treatment, and the operating costs are a blower for supplying oxygen for activated sludge treatment, a treated water circulation pump for activated sludge treatment, and a sludge circulation pump for activated sludge treatment. Include excess sludge discharge pump, flocculant injection pump, chlorine injection pump, ozone generator, at least one operating cost of chemicals.

  Further, the water treatment plant of the present invention includes a plurality of independent water treatment devices, a raw water distribution device that distributes the raw water that is introduced into the plurality of water treatment devices, and a plurality of treated water from the plurality of water treatment devices. A treated water distribution device that distributes to a demand destination, the raw water distribution device, operating conditions of each of the water treatment devices, and an operation control device that controls the treated water distribution device can be provided. In particular, the operation control device inputs the raw water inflow prediction value and the water quality prediction value, the demand water amount and the demand water quality of a plurality of demand destinations, a distribution amount for distributing the raw water to the water treatment devices, and A plurality of operation patterns in which the operation conditions of each water treatment device are changed for each distribution amount are set, the treated water quality of each water treatment device is calculated for each operation pattern, and the treated water of each water treatment device is used alone. Or an operation pattern that satisfies the demand water quantity and the demand water quality of the plurality of demand destinations is extracted, and at least one of the operation cost and sludge generation amount of the plurality of water treatment devices is the smallest among the extracted operation patterns. And the means for controlling the raw water distribution device, the operation conditions of each of the water treatment devices, and the treated water distribution device in accordance with the optimal operation pattern.

  In this case, a reservoir for temporarily storing the treated water to be supplied to the demand destination is provided on the downstream side of the treated water distribution apparatus, and the operation pattern of each water treatment series is set in consideration of storing in the reservoir. Can be set.

  Furthermore, each said water treatment apparatus has an activated sludge treatment tank, a final sedimentation basin, and an ozone treatment tank, The said operating expense is the blower which supplies oxygen to the said activated sludge treatment tank, The said activated sludge treatment tank The treated water circulation pump, the sludge circulation pump of the activated sludge treatment tank, the excess sludge discharge pump of the final sedimentation basin, the flocculant injection pump for injecting the flocculant into the activated sludge treatment tank, and discharged from the final sedimentation basin It may include at least one of a power cost and a chemical cost required for each of a chlorine injection pump for injecting chlorine into the treated water and an ozone generator for generating ozone to be injected into the ozone treatment tank.

  Hereinafter, the Example of the water treatment plant to which the water treatment method of this invention is applied is described.

  In FIG. 1, the system configuration | structure of the sewage treatment plant of one Example to which the water treatment method of this invention is applied is shown. As shown in the figure, the sewage treatment plant 1 of the present embodiment has a plurality of independent N (N = 2 or more, four series in the illustrated example) water treatment series 2-1, 2-2, 2-3, 2-4. It is formed. Although each water treatment series 2-1 to 2-4 can apply the water treatment process of the same structure, it can also apply a different water treatment process. In the present embodiment, only the detailed configuration is shown for each water treatment series 2-1, assuming that the water treatment series 2-1 to 2-4 are configured identically.

  The sewage 50 which is the raw water of the sewage treatment plant 1 of the present embodiment is first introduced into the settling basin 3. In the first sedimentation basin 3, the solid content in the sewage that has flowed in is removed by sedimentation. The supernatant liquid of the first sedimentation basin 3 is distributed to each water treatment series 2-1 to 2-4 by the sewage distributor 4. Specifically, the sewage distribution device 4 includes a valve, a pump, a weir, and the like. The sewage distributed to each of the water treatment series 2-1 to 2-4 is purified, and the treated water is supplied to a plurality of M (M = 2 or more, 3 in the illustrated example) through the treated water distribution device 5. Are temporarily stored in the intermediate water reservoirs 6A, 6B, and 6C provided for the respective uses) and are supplied to the respective uses A, B, and C. The treated water distributor 5 mixes the treated water discharged from each of the water treatment series 2-1 to 2-4 as it is or so as to satisfy the demand water amount and the demand water quality of each application A, B, and C. The intermediate water 7, 8, 9 of water quality suitable for each application A, B, C is generated and distributed to the intermediate water reservoirs 6A, 6B, 6C. In addition, the treated water distribution apparatus 5 can be specifically comprised by a valve, a pump, a weir, etc. Moreover, when there is little demand water quantity of middle water with respect to inflow sewage quantity, it discharges to the river etc. as the discharge water 10. FIG.

  The configuration of each of the water treatment series 2-1 to 2-4 includes an activated sludge treatment tank 11 into which the sewage supplied from the sewage distribution device 4 flows, A final sedimentation basin 12 into which treated water treated by the sludge treatment tank 11 flows and an ozone treatment tank 13 into which the supernatant water of the final sedimentation basin 12 flows are configured. In the activated sludge treatment tank 11, an oxygen supply blower 14 for injecting oxygen into the tank, a circulation pump 15 for circulating the treated water in the tank, and a flocculant for injecting the flocculant from the flocculant storage tank 16 into the tank. An agent injection pump 17 is provided. The final sedimentation basin 12 includes a sludge circulation pump 18 that returns a part of the precipitated sludge to the activated sludge treatment tank 11 and a sludge discharge pump 19 that discharges excess sludge out of the system. Further, for example, chlorine is injected into the supernatant water discharged from the final sedimentation basin 12 through the drug storage tank 20 via the drug injection pump 21. The ozone treatment tank 13 is provided with an ozone generator 22 for injecting ozone bubbles into the tank. That is, by aeration in the activated sludge treatment tank 11, the soluble BOD is taken into the activated sludge, and the activated sludge is settled and separated in the final sedimentation basin 12 to obtain a clear supernatant, and finally chlorine for sterilization is obtained. inject. Next, in the ozone treatment tank 13, decolorization and deodorization and the remaining organic substances are further decomposed and purified.

  Each of the water treatment series 2-1 to 2-4 configured in this way is controlled by the operation control device 30 together with the sewage distribution device 4 and the treated water distribution device 5. The operation control device 30 includes data such as a predicted inflow sewage amount 31, a predicted inflow sewage quality 32, a demand water amount 33 for each use A to C and a demand water quality 34 for each use A to C. Have been entered. Further, the operation control device 30 calculates the optimum operation conditions (operation parameters) of the water treatment series 2-1 to 2-4 and the mixing conditions in the treated water distribution device 5 according to the input data. Condition calculation means 40 is provided. And the operation control apparatus 30 outputs an operation control command to each water treatment series 2-1 to 2-4, the sewage distribution apparatus 4, and the treated water distribution apparatus 5 based on the calculation result of the operation condition calculation means 40. It has become. Specifically, the operation control commands for the water treatment series 2-1 to 2-4 are the oxygen supply blower 14, the sludge circulation pump 18, the treated water circulation pump 15, the sludge discharge pump 19, and the flocculant injection pump 17. There are a medicine injection pump 21 and an ozone generator 22.

  The operation condition calculation means 40 includes a water quality calculation module of a sewage treatment process that can calculate the treated water quality from the inflow sewage quality and the operation conditions of the water treatment series 2-N. The water quality calculation module includes at least one of a theoretical model for calculating a material balance relating to water quality and a calculation model interpolating past performance data. As a theoretical model for calculating a material balance relating to water quality, for example, there is an IWA Activated Sludge Model (ASM) proposed by IWA (International Water Association). This model classifies the microorganisms that make up activated sludge, and considers reactions such as the growth and death of each microorganism and the hydrolysis of solids and soluble organic matter. A calculation model in which past performance data is interpolated includes, for example, a matrix of performance values of operation conditions and removal rates, and is obtained by interpolating the removal rates under desired operation conditions.

  And the inflow sewage predicted value 31, the inflow sewage quality predicted value 32, the use demand water amount 33, and the use demand water quality 34 are given to the operation condition calculation means 40 as input conditions. It is effective to give the inflow sewage amount predicted value 31 based on the past inflow sewage amount actual value. Usually, since the amount of inflow sewage varies depending on the season, day of the week, and time, the inflow sewage amount prediction value 31 is a value that changes with time. In the future, when rainy weather is predicted, the predicted inflow sewage amount 31 can be given based on the flow calculation result in the pipeline based on the future rainfall prediction information.

  It is also effective to give the predicted inflow sewage quality value 32 based on the past inflow sewage quality actual value. Similar to the amount of water, the water quality varies depending on the season, day of the week, and time, so the inflowing sewage water quality prediction value 32 is a value that changes with time. Water quality items include pollutants, soluble organic substances, soluble nitrogen components, soluble phosphorus components, water temperature, pH, and the like.

  The demand water amount 33 by use is the amount of water required for various uses of middle water such as agricultural water, industrial water, purified water, landscape water, flush toilet wash water, cooling water, and water for spraying. The usage-specific demand water amount 33 may be a constant value, but is often a value that changes over time. For example, in FIG. 1, since three types of usages from usage A to usage C are assumed, three types of information on usage-specific demand water amount 33 are also required.

  The demand-specific water quality 34 is a water quality required for various uses of the above-described middle water. This value is given as a constant value that does not change with time.

  An algorithm for calculating the optimum operating conditions (operating parameters) of each of the water treatment series 2-1 to 2-4, the mixing conditions in the treated water distribution device 5, and the distribution conditions of the sewage distribution device 4 by the operating condition calculation means 40. An example will be described below with reference to FIGS.

  Now, it is assumed that three types of industrial water, flush toilet flush water, and agricultural water are required as the uses A to C of middle water. Suppose that the amount of demand water, the quality of demand water, and other features are as shown in FIG. The operating condition calculation means 40 optimizes the operating conditions of the sewage treatment plant 1 for such different demand water volume and demand water quality applications. Here, in order to satisfy the demand water amount and the demand water quality of each use, the operation condition is optimized by allowing the interchange of the intermediate water for producing intermediate water by mixing the treated water of a plurality of water treatment series.

  There is also a method of analytically deriving an optimal solution as a method for obtaining an appropriate operating condition in consideration of the amount of water and water quality, but the application of the brute force method is described here for the following reasons (1) and (2).

(1) Since the operation amount of the sewage treatment process does not change the value on the order of seconds or minutes, there is no need to obtain a solution instantaneously. (2) Even if the solution is theoretically obtained, demand The optimal solution may not be obtained depending on the water quality and demand water volume patterns. The calculation procedure when introducing the brute force method is as shown in the flowchart of FIG.

  That is, as shown in FIG. 3, the inflow sewage predicted value 31, the inflow sewage quality prediction value 32, the use-specific demand water amount 33, and the use-specific demand water quality 34 are captured (S 1), and the inflow sewage amount prediction value 31 is used as the water treatment series. Distribute to 2-N series (S2). At this time, it is based on equal distribution, but the case where the amount of treated water for each series is changed using the sewage distribution device 4 is also included in the examination. Moreover, according to the fluctuation | variation of the inflow sewage predicted value 31, the demand water amount 33 according to a use, etc., it is possible to set division | segmentation of a treated water amount for every fixed time, and it can recognize as a distribution pattern in this case.

  Next, the operation conditions of each series N are changed within the operable range, and a plurality of operation patterns combining them are set (S3). Next, the quality of treated water of each series N for each operation pattern for all set operation patterns is obtained by the water quality calculation module (S4). In addition, for each operation pattern, an operation cost (utility cost) composed of the amount of power used and the amount of chemical used and the amount of sludge generated are obtained. In addition, the utility cost is calculated to reflect the charge system for the aircraft that has introduced nighttime electricity. Next, using the brute force method, an operation pattern in step S3 that satisfies the usage-specific demand water amount 33 and the usage-specific demand water quality 34 is searched (S5). In this case, an operation pattern that satisfies the usage-specific demand water amount 33 and the usage-specific demand water quality 34 is also searched for, including singly or mixing the treated water of each series N.

  And the optimal operation pattern of the combination with which utility cost becomes the minimum and the combination with which the amount of discharged sludge becomes the minimum is extracted among the operation patterns which satisfy the demand-specific water quantity 33 and the usage-specific demand water quality 34 (S6). By the above algorithm, the demand water quantity 33 for each use and the demand water quality 34 for each use are satisfied with respect to the conditions of the inflow sewage predicted value 31 and the inflow sewage quality predicted value 32, and the utility cost or the amount of discharged sludge is minimized. Optimal operating conditions for each N can be obtained.

  Next, the operation control device 30 outputs a control command to the sewage distribution device 4 according to the operation conditions of the optimal operation pattern, distributes the sewage to each water treatment series 2-1 to 2-4, and each water treatment series 2 -1 to 2-4, an operation control command is output, and further, a control command is output to the treated water distribution device 5, and the treated water discharged from each water treatment series 2-1 to 2-4 is singly or mixed. , It is made to supply to the corresponding middle water storage areas 6A-6C.

  An example of the result of calculating the optimum operating condition that minimizes the utility cost according to the above embodiment is shown in FIGS. In these examples, the fixed time related to the change of the operating condition in step S2 in FIG. 3 is set to 6 hours, but is not limited thereto, and may be set at shorter intervals such as 30 minutes and 1 hour.

  As shown in FIG. 4, the inflow sewage amount fluctuates and the demand water amount for industrial water is constant. The flush toilet flush water is assumed to fluctuate as shown in the figure. Agricultural water fluctuates over time, but it is assumed that the amount of demand water is supplied on a daily basis as shown in the conditions shown in FIG. As shown in the figure, the industrial water and the flush toilet flush water can secure the demand water amount by supplying the treated water of series 1 and series 2, respectively. The middle water used as agricultural water supplies only the treated water of Series 3 from 9:00 to 21:00. From 19:00 to 9:00 on the next day, in addition to the treated water of Water Treatment Series 3, The calculation result which should supply mixed water was obtained. In addition, the difference between the total amount of industrial water, flush toilet wash water and agricultural water in each time zone and the amount of inflow sewage is discharged into rivers, etc. as discharge water together with the treatment of series 4 and surplus water of other series. The

  Thus, when the algorithm of the present embodiment is used, mixing and distribution when supplying a plurality of series of treated water as middle water for different uses can be optimized. According to the values in FIG. 4, the operation control device 30 outputs a control command to the sewage distribution device 4 to distribute sewage to each of the water treatment series 2-1 to 2-4, and each water treatment series 2-1 to 2. The operation control command is output to -4 to control the quality of treated water in each water treatment series. Furthermore, a control command is output to the treated water distribution apparatus 5 and the treated water discharged from each of the water treatment series 2-1 to 2-4 is controlled individually or mixed so as to satisfy the demand-specific water amount 33.

  FIG. 5 is an output result of the amount of air diffused from the oxygen supply blower 14 in each of the water treatment series 2-1 to 2-4. As shown in the figure, the amount of blower air diffused in the series 1 supplying industrial water that requires high water quality is larger than the amount of blower diffused in the other series 2, 3, and 4. On the other hand, the amount of blower aeration of Series 3, which mainly supplies agricultural water that does not cause any problems even if soluble organic matter, soluble nitrogen, and soluble phosphorus remain, is that activated sludge does not settle and dead activated sludge. The result should be as small as not excessive. Thus, when the algorithm of the present embodiment is used, an appropriate value of the amount of air diffused from the oxygen supply blower is output as an operation control command for each series. By operating the oxygen supply blower 14 according to this value, the operation of each series is controlled so that the demand water quality of the middle water in each application is satisfied.

  As described above, the output result of the proper value of the mixing amount of the middle water and the blower aeration amount for supplying oxygen has been described, but the same applies to other operating conditions such as the pump flow rate, the flocculant injection amount, and the chlorine injection amount. The result can be obtained as output.

  Moreover, as a method for calculating a proper solution, in the above-described embodiment, the procedure using the brute force method and an example of the trial calculation have been described, but a genetic algorithm, a steepest descent method, and a Monte Carlo method can be used instead.

  As described above, according to the first embodiment, by providing the operation condition calculation means 40 in the operation control device 30 of the sewage treatment plant, the amount of demand water and the quality of demand water for each use of the middle water are satisfied, In addition, operation that minimizes utility costs or discharged sludge is possible.

  That is, various uses are assumed for middle water, and the water quality required for each use is different. For example, when medium water is used as landscape water, it must be sufficiently decolored and deodorized. However, when used as agricultural water, decolorization and deodorization may not be complete. In addition, since it may be desired that nitrogen remains, it is necessary to provide a water treatment apparatus corresponding to each.

  However, as in the present embodiment, the raw water that is introduced is distributed to a plurality of independent water treatment systems, and the treated water that has been treated in each water treatment system is used alone or in combination to obtain the demand water volume and demand of a plurality of customers. By generating treated water suitable for each water quality and supplying it to each customer, the water quality required for each application can be reasonably manufactured. In addition, in response to fluctuations in the amount of inflow sewage and demand for middle water, it can be effectively adapted to demand by changing the operating conditions of the diagram treatment series to each of the water treatment plants with multiple water treatment series. Water can be produced.

  Furthermore, in producing a plurality of types of middle water, the operating cost or sludge generation amount can be minimized.

  FIG. 6 shows a system configuration of a sewage treatment plant according to another embodiment to which the water treatment method of the present invention is applied. As shown in the figure, this embodiment differs from the embodiment of FIG. 1 in that the storage amount 35 of the middle water reservoirs 6A, 6B, 6C is one of the input conditions of the operation condition calculation means 40 of the operation control device 30. It is in having added. That is, in the present embodiment, the utility cost or the discharged sludge can be further reduced because the flexibility to the amount of demand water is increased by considering the middle water reservoirs 6A, 6B, and 6C as buffers.

  The brute force method, genetic algorithm, and Monte Carlo method are also effective in calculating the optimum operating conditions including the middle water reservoir of this embodiment. The calculation procedure is the same as in the first embodiment. As the calculation result, in addition to the operation conditions of the first embodiment, a desirable temporal transition of the storage amount is output. By operating directly the valves and pumps related to the treated water distribution device 5 according to the calculation result of the temporal transition, it becomes possible to operate the sewage treatment plant more effectively.

  FIG. 7 shows a system configuration of a sewage treatment plant of still another embodiment to which the water treatment method of the present invention is applied. As shown in the figure, the present embodiment is different from the embodiment of FIG. 1 in that the calculation result obtained by the operating condition calculation means 40 is displayed on the display means 36. As a result, the operator can check the calculation results such as the operating conditions displayed on the display means 36 and determine the validity of the operating conditions. Moreover, about the water of each use distributed with the water treatment distribution apparatus 5, the mixed ratio of each water treatment series 21-24 can be output to the display means 36, and the validity of an operation result can be judged.

It is a system configuration | structure of the sewage treatment plant of one Example to which the water treatment method of this invention is applied. It is a figure which shows an example of the amount of demand water and the quality of demand water of industrial water, flush toilet water, agricultural water. It is a flowchart which shows an example of the procedure of the operating condition calculation in the operation control apparatus of the sewage treatment plant of FIG. 1 Example. As a result of calculating optimum operating conditions that minimize utility costs, it is a diagram showing an example of producing intermediate water by mixing the time variation of the treated water amount of each water treatment series and the treated water of each water treatment series is there. It is a figure which shows an example of the time change of the blower aeration quantity of each water treatment series as a result of calculating the optimal operating condition that the utility cost becomes the minimum. It is a figure which shows the system | strain structure of the sewage treatment plant of the other Example to which the water treatment method of this invention is applied. It is a figure which shows the system | strain structure of the sewage treatment plant of the further another Example to which the water treatment method of this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewage treatment plant 2-1 to 2-4 Water treatment series 3 Initial sedimentation tank 4 Sewage distribution device 5 Treatment water distribution device 6A, 6B, 6C Middle water reservoir 7, 8, 9 Middle water 10 Effluent water 11 Activated sludge treatment tank DESCRIPTION OF SYMBOLS 12 Final sedimentation tank 13 Ozone treatment tank 14 Oxygen supply blower 15 Circulation pump 16 Coagulant storage tank 17 Coagulant injection pump 18 Sludge circulation pump 19 Sludge discharge pump 20 Chlorine storage tank 21 Chlorine injection pump 22 Ozone generator 30 Operation control device 31 Predicted value of inflow sewage 32 Predicted value of inflow sewage quality 33 Demand water quantity by use 34 Demand water quality by use 40 Operating condition calculation means

Claims (10)

  Distribute the raw water that flows into multiple independent water treatment systems, and mix the treated water treated in each water treatment system to generate treated water that matches the demand water quantity and quality of the demand customer. Water treatment method for a water treatment plant that supplies water.   An operation control device that operates and controls the water treatment plant obtains at least one of the operation cost and sludge generation amount of the plurality of water treatment sequences, and treats the amount of treated water and the quality of the treated water, The water treatment method for a water treatment plant according to claim 1, wherein at least one of the sludge generation amounts is set to a value that minimizes the amount of sludge generation.   Mixing the treated water of a plurality of independent water treatment series to set the amount of treated water and the quality of the treated water satisfying the demand water quantity and the demanded water quality of the demand destination, and setting each of the set water treatment series Each water treatment that calculates at least one of the operating cost and sludge generation amount of each water treatment series based on the treated water amount and the quality of treated water, and minimizes at least one of the calculated operating cost and sludge generation amount A water treatment method for a water treatment plant operation control device that operates each water treatment series based on the amount of treated water and the quality of the treated water and mixes the treated water of each water treatment series.   4. A reservoir for temporarily storing treated water to be supplied to the demand destination is provided, and the amount of treated water for each water treatment series is set in consideration of storing in the reservoir. Water treatment method.   Each of the water treatment series includes activated sludge treatment and ozone treatment, and the operation cost includes a blower for supplying oxygen for the activated sludge treatment, a treated water circulation pump for the activated sludge treatment, and an activated sludge treatment. 4. The water treatment method according to claim 3, comprising at least one of a sludge circulation pump, a surplus sludge discharge pump, a flocculant injection pump, a chlorine injection pump, an ozone generator, and a chemical cost.   The water treatment method according to claim 3, wherein the mixed ratio of the water treatment series is output to display means for the water by the mixing. A plurality of independent water treatment devices, a raw water distribution device that distributes the incoming raw water to the plurality of water treatment devices, and a treated water distribution device that distributes the treated water of the plurality of water treatment devices to a plurality of customers. The raw water distribution device, the operation condition of each water treatment device and an operation control device for controlling the treated water distribution device,
The operation control device inputs the raw water inflow prediction value and the water quality prediction value, the demand water amount and the demand water quality of a plurality of demand destinations, a distribution amount for distributing the raw water to each water treatment device, and the distribution Set a plurality of operation patterns with different operating conditions for each water treatment device for each quantity, calculate the treated water quality of each water treatment device for each operation pattern, and mix the treated water of each water treatment device And extracting an operation pattern that satisfies the demand water amount and the demand water quality of the customer, and among the extracted operation patterns, an optimum operation pattern in which at least one of the operation cost and sludge generation amount of the plurality of water treatment devices is minimum A water treatment plant comprising means for controlling the raw water distribution device, the operating conditions of each water treatment device, and the treated water distribution device according to the optimum operation pattern.   A reservoir for temporarily storing treated water to be supplied to the demand destination is provided on the downstream side of the treated water distributor, and the operation pattern of each water treatment series is set in consideration of storing in the reservoir. The water treatment plant according to claim 7.   Each of the water treatment devices has an activated sludge treatment tank, a final sedimentation basin, and an ozone treatment tank, and the operating cost includes a blower for supplying oxygen to the activated sludge treatment tank, and the treatment of the activated sludge treatment tank. A water circulation pump, a sludge circulation pump of the activated sludge treatment tank, a discharge pump of excess sludge in the final sedimentation tank, a flocculant injection pump for injecting a flocculant into the activated sludge treatment tank, and treated water discharged from the final sedimentation tank The apparatus according to claim 7, further comprising at least one of a power cost and a chemical cost required for a chlorine injection pump for injecting chlorine into the ozone treatment chamber and an ozone generator for generating ozone to be injected into the ozone treatment tank. Water treatment plant.   The water treatment plant according to claim 7, wherein the mixed ratio of the water treatment series is output to display means for the water by the mixing.

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