Drainage treatment system and method

Abstract

Provided are a drainage treatment system and method that can miniaturize a storage tank while preventing overflow (overflow) when receiving drainage from a large number of factories. A drainage treatment system stores sewage from a plurality of factories in a storage tank, purifies the sewage from the storage tank by a water treatment device composed of a combination of a solid purifier and a liquid regeneration agent, and controls the water treatment device by a drainage treatment equipment control device, wherein the drainage treatment system is characterized in that the water treatment device includes: a solid purifier filter device that performs a purification operation to convert the sewage from the storage tank into purified water; and a regeneration device that performs a regeneration operation to desorb impurities adsorbed on the solid purifier filter device, and the drainage treatment equipment control device obtains work plan information from a plurality of factories to predict the drainage volume of the sewage from the factories, and predicts the changes in physical quantities of the storage tank and various parts of the water treatment device when the predicted drainage volume is reached, and controls the timing of the operation of the water treatment device according to the prediction result.

Description

Technical Field

[0001] The present invention relates to a wastewater treatment system and method for treating wastewater from a plurality of factories. Background Art

[0002] Various equipment for treating wastewater is known. For example, referring to Patent Document 1, by performing purification using an adsorbent and regeneration using a liquefied gas, a wastewater treatment equipment that is more compact than the conventional technology can be realized.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: WO2015 / 033455 Summary of the invention

[0006] Problems that the invention aims to solve

[0007] The treatment equipment of Patent Document 1 has the advantage of being able to perform wastewater purification and adsorbent regeneration in a compact and simple manner, and is expected to become future wastewater treatment equipment, but a storage tank must be separately provided in the upstream stage.

[0008] The drainage from the factory is stored in the storage tank, but it is difficult to predict the change of the water volume discharged from these multiple factories, especially when receiving drainage from a large number of factories. Therefore, it is necessary to set a huge storage tank in the front stage of the drainage treatment device in order to balance the inflow. In addition, since the storage tank is not allowed to overflow (overflow), the operation of the factory needs to be stopped if the water level reaches a high level.

[0009] In view of the above, an object of the present invention is to provide a wastewater treatment system and method which are suitable for preventing overflow while miniaturizing a storage tank when receiving wastewater from a large number of factories.

[0010] Means for solving problems

[0011] According to the above, in the present invention, there is a wastewater treatment system, which accumulates wastewater from a plurality of factories in a storage tank, purifies the wastewater from the storage tank by a water treatment device composed of a combination of a solid purifier and a liquid regeneration agent, and controls the water treatment device by a wastewater treatment equipment control device. The wastewater treatment system is characterized in that the water treatment device includes: a solid purifier filter device that performs a purification operation to convert the wastewater from the storage tank into purified water; and a regeneration device that performs a regeneration operation to desorb impurities adsorbed on the solid purifier filter device, and the wastewater treatment equipment control device obtains work plan information from a plurality of factories to predict the discharge volume of the wastewater of the factories, and predicts the changes in physical quantities at various locations of the storage tank and the water treatment device when the predicted discharge volume is reached, and controls the timing of the operation of the water treatment device based on the prediction result. In addition, the present invention is a drainage treatment method, in which sewage from a plurality of factories is stored in a storage tank, and the sewage from the storage tank is purified by a water treatment device. The drainage treatment method is characterized in that the water treatment device performs a purification operation to convert the sewage from the storage tank into purified water and a regeneration operation to desorb impurities adsorbed on a solid purifying agent, obtains work plan information from a plurality of factories to predict the discharge volume of sewage from the factories, and predicts the changes in physical quantities at various locations in the storage tank and the water treatment device at the time of the predicted discharge volume, and determines the timing of the operation of the water treatment device based on the prediction results.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to provide a wastewater treatment system and method suitable for preventing overflow while miniaturizing a storage tank when receiving wastewater from a large number of factories. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a diagram showing an overall configuration example of a wastewater treatment system according to an embodiment of the present invention.

[0015] Figure 2 This is a diagram showing an example of the overall structure of an activated carbon filtration / regeneration device to which the present invention is applied.

[0016] Figure 3 It is a diagram showing a specific configuration example of the wastewater treatment equipment control device 4.

[0017] Figure 4 It is a flowchart showing the processing contents of the process control unit 43 .

[0018] Figure 5a This is a diagram showing an example of the operation of wastewater treatment equipment in the related art.

[0019] Figure 5b This is a diagram showing an example of the operation of the wastewater treatment equipment of the present invention predicted in the future.

[0020] Figure 6a This is a diagram showing an example of operation of the wastewater treatment equipment during normal operation.

[0021] Figure 6b This is a diagram showing that overflow occurs at t6 which is a future time point as a prediction result.

[0022] Figure 6c This is a diagram showing effective countermeasures in a state where the occurrence of flooding is predicted.

[0023] Figure 7a This is a diagram showing an example of a normal purge operation.

[0024] Figure 7b This is a diagram showing an example of operation of the wastewater treatment equipment of the present invention with emphasis on cost, which is predicted in the future.

[0025] Figure 8 This is a diagram showing the operation procedure of the wastewater treatment system according to the present invention. DETAILED DESCRIPTION

[0026] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0027] Example 1

[0028] Figure 1 An example of the overall structure of a drainage treatment system according to an embodiment of the present invention is shown. The drainage treatment equipment 1 is composed of a storage tank 2 on the upstream side and an activated carbon filter / regeneration device 3, and is generally controlled by a drainage treatment equipment control device 4 composed of a computer. In addition, sewage from a plurality of factories 5 flows into the storage tank 2 and is stored, and the activated carbon filter / regeneration device 3 as a water treatment device purifies the sewage using activated carbon as a solid purifier to convert the sewage into purified water and discharge it. In addition, due to the deterioration of the performance of the activated carbon filter device, it is regenerated, and the adsorbed substances (pollutants) generated by the regeneration are appropriately recovered. The activated carbon filter / regeneration device 3 is as shown in FIG. Figure 2 As shown in detail in the figure and described later, it includes: an activated carbon adsorption device 31 (solid purifying agent filtering device) that performs a purification operation to convert sewage from the storage tank 2 into purified water; and a regeneration device 32 that performs a regeneration operation to desorb impurities adsorbed on the activated carbon adsorption device 31.

[0029] The wastewater treatment equipment control device 4 controls the timing of regeneration, purification, replacement of activated carbon, replacement / supplement of liquid regeneration agent, and recovery of adsorbent in the activated carbon filter / regeneration device 3. In order to perform these processes, the wastewater treatment equipment control device 4 of the present invention inputs, in addition to the work plan information Sg1 of the plurality of factories 5, weather information (rain information) Sg2, sewage concentration information Sg3 from the concentration sensor 6, pollution information S4 from the DME pollution degree sensor 7 of the regeneration device 32 provided in the activated carbon filter / regeneration device 3, and purified water concentration information Sg5 from the concentration sensor 8, thereby determining the timing and the like.

[0030] The activated carbon filtration / regeneration device 3 is for example Figure 2 That's the structure. Figure 2 The activated carbon filtration / regeneration device 3 has a treatment tank 22, a pump 21, a condenser 29, an evaporator 28 and a plurality of valves V (V11 to V15) as main structural elements, and performs activated carbon filtration treatment through a path from the storage tank 2 to the treatment tank 22 (activated carbon adsorption device 31), and performs regeneration treatment of the treatment tank 22 through a regeneration device 32 composed of a path from the treatment tank 22 via the evaporator 28, the condenser 29, and the pump 21 to reach the treatment tank 22 again.

[0031] According to the above structure, first, in the normal sewage treatment mode (purification mode), the operation is carried out with valves V11, V12, and V15 closed and valves V13 and V14 opened. The sewage from the storage tank 2 contacts the adsorbent filled in the treatment tank 22, so that impurities are adsorbed on the adsorbent, and purified water without impurities is obtained from the outlet of the treatment tank. If the operation is continued in this state, the impurities will leak out due to adsorption saturation, so the operation is temporarily stopped before the impurities leak out, and the regeneration mode of the adsorbent is transferred. During the transfer, water is removed from the treatment tank, but water and impurities are attached to the adsorbent.

[0032] In the regeneration mode of the adsorbent, the operation is performed with valves V11 and V12 opened and valves V13 and V14 closed. The liquid regeneration agent for regenerating the adsorbent uses, for example, liquefied dimethyl ether (DME) as a substance A that is a gas at normal temperature and pressure. The substance A is maintained at a saturated vapor pressure in the flow path of the regeneration mode, and a part of it exists in a liquefied state. In addition, the changes in temperature and pressure are recorded in the figure. This shows different values ​​depending on the substance A used, and is an example recorded to illustrate the flow of energy.

[0033] First, the liquefied substance A is extracted from the lower part of the condenser 29 and sent to the treatment tank 22 through the valve V11 by the pump 21. In the treatment tank 22, the adsorbent is immersed in the sent liquefied substance A. At this time, the impurities adsorbed on the adsorbent are desorbed due to their high affinity with the liquefied substance A, and are dissolved into the liquefied substance A together with water. Next, the liquefied substance A in which the water and impurities are dissolved is sent to the evaporator 28 through the valve 12. In the evaporator 28, the energy of the latent heat part for vaporizing the liquefied substance A is supplied, and the state in which only the liquefied substance A with the lowest boiling point vaporizes and impurities and water remain is formed. The vaporized substance A is sent to the condenser 29, and the substance A is liquefied by cooling. The liquefied substance A obtained here is sent to the treatment tank 22 again, and is used again for desorption of impurities from the adsorbent.

[0034] The above-mentioned cycle of the state change of the substance A is repeated as many times as necessary, thereby desorbing most of the impurities attached to the adsorbent. At the time point when the desorption is completed, the valve V12 is closed, and after the liquefied substance A is extracted from the processing tank 22 by the reverse rotation of the pump 1 or a separately prepared extraction pump, the valve 15 is opened to reduce the pressure of the processing tank 22 or open it to the atmosphere, so that the liquefied substance A adsorbed on the adsorbent is gasified, thereby obtaining a regenerated adsorbent that has restored the adsorption capacity and is close to a new product.

[0035] In this embodiment, the pump 1 is used for the circulation of the substance A, but the compressor can also replace its function. However, since the compressor is an object for circulating the gas, when used in this embodiment, it only needs to be installed downstream of the evaporator 28 and upstream of the condenser 29.

[0036] Figure 3 The specific configuration example of the drainage treatment equipment control device 4 is shown. The drainage treatment equipment control device 4 is generally composed of a computer, and here, it is conveniently expressed by the processing function executed by the computer. The processing function in the drainage treatment equipment control device 4 is composed of a drainage volume prediction unit 41, a physical quantity detection unit 42, and a process control unit 43. When the process control unit 43 is constructed, an example of using a learning function is shown in the embodiment shown in the figure. In this case, it includes a learner 45, a database 44, and a control unit 46. In addition, the process control unit 43 can be realized by a general control theory.

[0037] In the drainage prediction unit 41 in the drainage treatment equipment control device 4, the work plan information Sg1 of the multiple factories 5 that discharge sewage into the storage tank 2 is obtained respectively, and the drainage of the factory is predicted based on the work plan information Sg1, and the total drainage from the entire factory is predicted. In addition, generally, there is a certain correlation between the work plan information Sg1 and the drainage of the factory, but sometimes there are variable factors caused by the characteristics and usage of the machine used (for example, there is a storage tank in the factory, and drainage is carried out in a batch process, etc.), seasonal factors, etc., and in the sense of grasping these relationships, it is better to set the device structure to be able to apply the so-called learning function to perform more accurate drainage prediction. However, in the present invention, as long as the prediction can be made, the specific implementation method of the prediction is not limited.

[0038] The work plan information Sg1 in this case may be short-term information such as the next day, or medium / long-term information in units of weeks or months, but it is preferable to ensure a time longer than T of the regeneration treatment time in the activated carbon filter / regeneration device 3 described later. This means that the work plan information Sg1 including the future work plan is required, wherein the future is a future longer than T until the purification treatment of the wastewater is switched to the regeneration treatment of the filter device and the purification treatment of the wastewater is restarted.

[0039] The physical quantity detection unit 42 detects concentration, water level, flow rate, temperature, etc. from various sensors. Figure 1 In the figure, only sensors 6, 7, and 8 for displaying concentration and contamination degree are illustrated, but in addition, there are also water level sensors for detecting the water level of the storage tank 2, flow sensors for detecting the flow rate flowing into or out of the storage tank 2, temperature sensors for detecting the temperature in the activated carbon filtration / regeneration device 3, etc., which are appropriately transmitted to the physical quantity detection unit 42 and used in subsequent processing.

[0040] The process control unit 43 is an example of a structure when the learning function is used, but the present invention is not limited to the use of the learning function. Figure 4 The following processing is exemplified. Figure 4 This is a flowchart showing the processing contents in the process control unit 43. It may be useful to utilize a learning function in part of this processing.

[0041] exist Figure 4In the first processing step S1 of the flow, the predicted discharge value at a future time point predicted by the discharge prediction unit 41, various physical quantities at the current time point detected by the physical quantity detection unit 42, the predicted precipitation value, and the allowable value (limit value) for the physical quantity are taken in. In the processing step S2, each physical quantity at each predicted time point of the predicted discharge value is estimated and predicted. In addition, this processing can be calculated using the causal relationship between the physical quantities, or a learning function can be used.

[0042] In processing steps S3, S4, and S5, it is confirmed as a physical quantity that the pollution concentration of the purified water, the predicted value of the water level of the storage tank 2, and the pollution degree of the treatment layer 22, which should be monitored in particular, exceed their respective allowable values. If it is determined that the allowable value is not exceeded ("No" side), the process returns to processing step S2 and continues to execute the above-mentioned process. If it is determined that the allowable value is exceeded ("Yes" side), the process moves to processing steps S6, S7, and S8 to seek appropriate countermeasures corresponding to each state.

[0043] In addition, here, the pollution concentration of the purified water and the pollution degree of the treatment layer 22 are values ​​at the current time point or at a future time point, and the water level of the storage tank 2 can be set as a predicted value at a future time point. That is, for the pollution concentration of the purified water and the pollution degree of the treatment layer 22 exceeding the allowable value, the monitoring result at the current time point (or the predicted result at a future time point) is reflected in the control at the current time point (or the future time point), and for the water level of the storage tank 2, it is preferable to perform predictive control based on the predicted result at a future time point (the control execution time point is a future time point). In addition, as a physical quantity other than the above, there is the concentration management of the inflow water, and as described in Example 4, it is preferable to apply predictive control in the same way as the water level of the storage tank 2.

[0044] The countermeasures in the processing steps S6, S7, and S8 can be individually preset. In particular, since the water level exceeding the storage tank 2 is a predicted event at a future time point, many suboptimal measures can be sought between the current time point and the predicted event occurrence time point. In particular, when the learning function is used, an appropriate countermeasure that comprehensively considers past examples can be proposed in the processing step S7.

[0045] As a use scenario of the drainage treatment equipment control device 4 involved in the present invention, it is considered to be set to semi-automatic or fully automatic. In the case of semi-automatic, it is constructed as an auxiliary device, and the countermeasures in the processing steps S6, S7, and S8 or the learning results in the processing step S7 are visually prompted to the manager together with other information, and the judgment is relied on. In addition, in the case of semi-automatic, it is also useful to prompt the manager in advance with the future prediction results of the pollution concentration of the purified water and the pollution degree of the treatment layer 22, and let him know that it is necessary to deal with it in the near future. In the case of fully automatic, in the processing step S9, the judgment result is transmitted to the valve V as the operating end of the activated carbon filtration / regeneration device 3 and the pump (not shown) provided in the sewage supply pipeline, and they are controlled.

[0046] In addition, an example of the countermeasure in processing step S6 is a common action such as transferring to regeneration operation and restarting purification operation after completion. An example of the countermeasure in processing step S8 is a common action such as replacing or replenishing DME or replacing activated carbon. In contrast, the countermeasure in processing step S7 is a countermeasure unique to the present invention, and the details are described later.

[0047] Figure 5a An example of the use of a conventional wastewater treatment facility that does not use the present invention is shown. In this example, a time series change example of the water level of the storage tank 2, the purified water flow rate, the inflow, and the purified water pollution concentration is shown, and the process of stopping the operation after the purification operation / regeneration operation and repeating the purification operation / regeneration operation / operation stop again is used as a typical pattern.

[0048] In this example, the purified water contamination concentration of the portion shown in the processing steps S3 and S4 and the water level of the storage tank 2 are compared with the allowable value. According to this, the purification operation is switched to the regeneration operation at the timing when the purified water contamination concentration exceeds the allowable value, and after the regeneration is completed, the purification operation is restored on the basis of ensuring the operation stop period.

[0049] On the other hand, at the time t1 when the discharge of the wastewater from the storage tank 2 to the activated carbon filtration / regeneration device 3 is stopped, the wastewater from the factory 5 to the storage tank 2 increases, and the wastewater overflows in the storage tank 2 . Figure 5a This is an example of the use of drainage treatment equipment in the prior art. Since it is based only on the monitoring and control at the current moment, it is impossible to prevent the overflow.

[0050] On the other hand, when future prediction is performed using the operation plan information Sg1 of the plurality of factories 5 according to the present invention, it is possible to Figure 5b As Figure 5bThe premise is that the current time is, for example, time point t0 until Figure 5a The changing states of various physical quantities and the like up to time point t1 are predicted.

[0051] In this case, the countermeasure of step S7 that can be adopted by the wastewater treatment equipment control device 4 of the present invention is the following system: sewage treatment can be performed at the timing of the situation that the sewage from the factory 5 to the storage tank 2 increases due to the purification operation at time t1. In addition, as a premise, the following system is used: since the purified water pollution concentration becomes the switching condition from the purification operation to the regeneration operation, the group operation of one purification operation, one regeneration operation and one operation stop is completed before time t1, so that the purified water pollution concentration becomes low at time t1. In specific operation, the group operation of one purification operation, one regeneration operation and one operation stop is completed within the time ensured by shortening the operation stop period. If the purified water pollution concentration is in a low state, the water level of the storage tank 2 can be lowered to ensure the period faced by the possibility of overflow.

[0052] As is clear from the above, Figure 4 The countermeasure of step S7 is: for the predicted result that sewage overflow occurs in the storage tank 2, a group operation of one purification operation, one regeneration operation and one operation stop is completed in advance, and at the time of sewage overflow prediction, the purification operation is set, and it is set as soon as possible after the purification operation starts.

[0053] exist Figure 5a , Figure 5b In the figure, a specific method for maintaining the regeneration operation at the time t1 when flooding is predicted and performing the control of the preceding stage is shown. The specific method for realizing the specific countermeasure based on the relationship between the active carbon contamination degree and the active carbon contamination degree is shown. Figure 6a , Figure 6b , Figure 6c to explain.

[0054] Figure 6a The following is an example of the use of the wastewater treatment equipment during normal operation. In this example, the water level, purified water flow rate, inflow rate, and activated carbon contamination level of the storage tank 2 are represented together with the upper limit of the water level and the upper limit of the activated carbon contamination level. The process of stopping the operation after the purification operation / regeneration operation and repeating the purification operation / regeneration operation / operation stop is used as a typical pattern. In addition, the switching period before and after the regeneration operation is also shown in this figure.

[0055] In addition, the simulation conditions set as the premise here are that the inflow is fixed, the purified water volume is 3.6 times, the water level is the difference between the inflow and the outflow, the switching time of the mode before and after regeneration is 0.45 hours, the 100% regeneration time is 0.95 hours, the 50% regeneration time is 0.3 hours, and the benchmark for starting the purification operation is set to the water level being 2 / 3 of the full water.

[0056] Figure 6b It is shown that overflow occurs at t6, which is a future time point, as a prediction result. In addition, time t6 is within the switching time after the regeneration treatment, but the switching time is also included and is set within the range of the regeneration operation. In any case, since it is not a purification operation, water treatment cannot be performed, that is, it is a period when the water level control of the storage tank 2 does not work.

[0057] Figure 6 c The following are examples of effective countermeasures that can be taken from the current time point t0 to the overflow time t6 when overflow is predicted. Countermeasure 1 is to extend the regeneration operation period from time t3 to t4 to the period of 100% regeneration of the activated carbon contamination degree in anticipation of an increase in load. Countermeasure 2 is to switch the operation stop period after regeneration to a short time at time t5 after the purification operation, which is temporarily stopped due to a drop in the water level. Countermeasure 3 is to restart the purification operation after the operation stop, and perform the purification operation until the limit.

[0058] As a result, the regeneration operation is executed at the predicted overflow occurrence time, but for the regeneration at this time, the target removal capacity (regeneration time) (50% in this case) is determined based on the predicted increase in the tank water level, and overflow will occur regardless of whether it is too short or too long.

[0059] Figure 6c Ideas and Figure 5b Similarly, in summary, when overflow due to an increase in load is predicted, the removal capacity is restored to 100% in advance.

[0060] Example 2

[0061] Example 1 is an example of using the function of the learner to reflect the prediction results in actual operation to achieve a specific control method. This can be said to be a response to abnormalities such as overflow. In contrast, in Example 2, the running cost is reduced by using the function of the learner. Figure 7a , Figure 7b To explain.

[0062] Figure 7a The following is an example of a normal purification operation. Figure 5aSimilarly, the operation is stopped after purification / regeneration and purification / regeneration / operation stop is repeated again. In this regard, if it is determined in advance that the discharge amount from the factory is small and the low load state continues, as the discharge amount prediction result based on the operation plan information Sg1 of the plurality of factories 5, then Figure 7b As shown in the example, it is better to use the prediction result to shorten the regeneration time. In this way, the high pollution level is maintained and the operation is continued, so that the pollution level will not be reduced in the opposite direction. As a result, according to this operation mode, the adsorption and desorption characteristics of activated carbon can be effectively utilized to reduce the regeneration degree, thereby reducing the regeneration cost.

[0063] Example 3

[0064] In Example 3, using Figure 8 The general overall operation procedure of the wastewater treatment system according to the present invention will be described. In the first treatment step S11 in the flow, the wastewater is purified by operating the activated carbon adsorption device 31 (treatment tank 22), and a regeneration operation is performed as appropriate.

[0065] In the processing step S12, the purified water concentration immediately after regeneration is compared with the upper limit value thereof. In addition, the upper limit value here is not an allowable value as a criterion for judging whether the purification operation is switched to the regeneration operation, but a criterion for judging whether the purification performance of the activated carbon has reached the replacement period due to the degradation of the activated carbon. Since the upper limit value is exceeded, in the processing step S13, the activated carbon adsorption device 31 is stopped and the activated carbon is replaced. After the activated carbon is replaced, the operation of the activated carbon adsorption device 31 (treatment tank 22) in the processing step S11 is entered. In this case, after confirming that the given performance has been achieved, confirmation measures such as entering the activated carbon adsorption operation are carried out. This is self-evident.

[0066] In the processing step S14, it is checked whether there is a special instruction from the wastewater treatment equipment control device 4. If there is an instruction, it will transfer to the processing step S22. If there is no instruction, it will transfer to the normal processing of the processing step S15. Here, the so-called special instruction from the wastewater treatment equipment control device 4 is, for example, Figure 6b The instruction of the operation mode shown in the example is to set the operation with cost emphasis by performing the regeneration operation in the specified execution period. In the case of no special instruction, the purified water concentration is compared with the allowable value through the normal processing of the processing step S15, and when it exceeds the allowable value, the regeneration operation is entered in the processing step S18.

[0067] If the purified water concentration is below the permissible value in step S15, then step S16 is executed to perform a process of predicting and monitoring the water level of the storage tank 2. If there is no abnormality in the transition, the process returns to step S11 and continues the normal purification process (activated carbon adsorption process). If the water level of the storage tank 2 is above the permissible value in step S16, step S17 is executed. Figure 5b The preventive measures for overflow at the predicted time point are shown.

[0068] The regeneration operation of processing step S18 is executed as long as there is no stop instruction from the wastewater treatment equipment control device 4 in the judgment of processing step S19. When there is no stop instruction, when the measured value of the DME sensor in processing step S20 is above the allowable value, the regeneration device is stopped in processing step S21 and the DME is replaced.

[0069] Example 4

[0070] In the first embodiment, the pollution concentration of the purified water, the pollution degree of the treatment layer 22, and the water level of the storage tank 2 are monitored and controlled. In contrast, in the fourth embodiment, the concentration of the sewage flowing in from the storage tank 2 is managed.

[0071] In the case where the inflow concentration of the storage tank 2 changes, it is moderated in the storage tank 2 and sent to the activated carbon filtration / regeneration device 3. Even in the case of concentration, the effect of the advance countermeasures brought about by the operation change based on the prediction of concentration change can be expected. Specifically, if the pollutant concentration increases, the possibility of overflow increases because the amount of water that can be purified decreases. At this time, if the concentration is predicted to rise in advance, the amount of purified water can also be increased by improving the removal capacity of activated carbon in advance. Therefore, the above-mentioned method of changing the operation method of the purification equipment for the prediction of flow change can also be applied to concentration changes.

[0072] In addition, in the wastewater treatment in Examples 1 to 4, purification using activated carbon as a solid purifier and regeneration using liquefied gas as a liquid regenerant are described as examples, but the present invention is not limited to this combination, and other adsorbents and sand filtration can also be used as solid purifiers instead of activated carbon. For example, if sand filtration is used, solid matter can be removed physically, and if silica gel or alumina gel is used, since it also shows adsorption when added to sand filtration, dissolved substances can also be removed. In contrast, when activated carbon is used, the difference is that the types and adsorption amounts of substances that can be adsorbed can be increased. The regenerant to be combined is not necessarily limited to liquefied gas, and an appropriate regenerant can be selected according to the combination of the removal object and the purifier.

[0073] Description of Reference Numerals

[0074] 1: Drainage treatment equipment, 2: Storage tank, 3: Activated carbon filtration / regeneration device, 4: Drainage treatment equipment control device, 5: Factory, 6, 8: Concentration sensor, 7: Pollution sensor, 8: 21: Pump, 22: Treatment tank, 28: Evaporator, 29: Condenser, 41: Drainage volume prediction unit, 42: Physical quantity detection unit, 43: Process control unit, 44: Database, 45: Learner, 46: Control unit, V11 to V15: Valves.

Claims

1. A wastewater treatment system, wherein wastewater from a plurality of factories is stored in a storage tank, the wastewater from the storage tank is purified by a water treatment device composed of a combination of a solid purifier and a liquid regenerant, and the water treatment device is controlled by a wastewater treatment equipment control device, wherein the wastewater treatment system is characterized in that: The water treatment device comprises: a solid purifier filtering device that performs a purification operation in a treatment tank to convert the sewage from the storage tank into purified water; and a regeneration device for performing a regeneration operation to desorb impurities adsorbed on the solid purifying agent filter device in the treatment tank, The wastewater treatment equipment control device acquires work plan information from the plurality of factories to predict the discharge volume of the wastewater of the factories, predicts the change of physical quantities of the storage tank and various parts of the water treatment device at the time of the predicted discharge volume, and controls the operation timing of the water treatment device according to the prediction result. When overflow of the storage tank is predicted as a result of the prediction of the drainage volume and the transition of the physical quantity, the water treatment device is controlled in advance so that the water treatment device enters the purification operation at the overflow prediction time point.

2. The drainage treatment system according to claim 1, characterized in that: When the result of the prediction of the drainage amount indicates that the state in which the drainage amount is small continues, the timing of the operation of the water treatment device is controlled so that the execution time of the regeneration operation is shortened.

3. The drainage treatment system according to claim 1, characterized in that: In the initial stage of transition from the regeneration operation to the purification operation, when the concentration of the purified water exceeds an upper limit value, the water treatment device is stopped and the activated carbon is replaced.

4. The drainage treatment system according to claim 1, characterized in that: During the regeneration operation, when the contamination concentration of the liquid regeneration agent from the contamination level sensor provided in the regeneration device exceeds an upper limit value, the regeneration device is stopped and the liquid regeneration agent is replaced.

5. The drainage treatment system according to any one of claims 1 to 4, characterized in that: The solid purifying agent is sand.

6. The drainage treatment system according to any one of claims 1 to 4, characterized in that: The solid purifier is an adsorbent.

7. The drainage treatment system according to any one of claims 1 to 4, characterized in that: The solid purifier is activated carbon.

8. A method for treating wastewater, wherein wastewater from a plurality of factories is stored in a storage tank and the wastewater from the storage tank is purified by a water treatment device, wherein: The water treatment device performs a purification operation in which the sewage from the storage tank is converted into purified water in the treatment tank and a regeneration operation in which impurities adsorbed to the solid purification agent are desorbed in the treatment tank. Acquiring operation plan information from the plurality of factories to predict the discharge volume of sewage from the factories, predicting the change in physical quantities of the storage tank and the water treatment device at the time of the predicted discharge volume, and determining the operation timing of the water treatment device based on the prediction result, When overflow of the storage tank is predicted as a result of the prediction of the drainage volume and the transition of the physical quantity, the water treatment device is controlled in advance so that the water treatment device enters the purification operation at the overflow prediction time point.

9. The method for treating wastewater according to claim 8, characterized in that: The solid purifying agent is sand.

10. The wastewater treatment method according to claim 8, characterized in that: The solid purifier is an adsorbent.

11. The wastewater treatment method according to claim 8, characterized in that: The solid purifier is activated carbon.

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