A system and method for maintaining microbial activity in on-site treatment of runoff sewage

Abstract

The present application relates to the technical field of non-point source pollution control, and discloses a runoff sewage on-site treatment microbial activity maintaining system and method, which is connected with a microbial treatment system and comprises a treatment unit, a first storage unit, a hydrolysis unit, a separation unit and a second storage unit. The present application fully intercepts a large amount of particulate pollutants contained in rainwater runoff through the treatment unit, further hydrolyzes and acidifies the particulate pollutants into a hydrolysate containing soluble organic matter and volatile fatty acids which can be easily utilized by microorganisms in the hydrolysis unit, so that the obtained hydrolysate is transmitted to the microbial treatment system in the dry season to maintain the activity of sludge in the microbial treatment system. Meanwhile, through the hydrolysis method, not only is the increase of operation cost caused by the supplement of carbon source in the dry season avoided, but also the resourceization of pollutants is realized, the drug consumption is reduced, and the low-carbon environmental protection concept is met.

Description

Technical Field

[0001] This invention relates to the field of non-point source pollution control technology, specifically to a system and method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater. Background Technology

[0002] For on-site treatment of soluble pollutants in stormwater runoff or overflow sewage, the main approach is microbial treatment based on activated sludge. However, microbial treatment relies heavily on microbial activity, and since runoff or overflow pollution is caused by rainfall, in the absence of rainfall for extended periods, the microbial treatment system is prone to water shortages that prevent it from maintaining microbial activity. Furthermore, adding external carbon sources would significantly increase chemical consumption, which is inconsistent with the principles of low-carbon and environmental protection. Summary of the Invention

[0003] In view of this, the present invention provides a system and method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater, in order to solve the problem that the microbial treatment system cannot maintain its activity due to water shortage during non-rainy periods, resulting in high chemical consumption and failing to meet the concept of low carbon and environmental protection.

[0004] In a first aspect, the present invention provides a microbial activity maintenance system for on-site treatment of runoff wastewater, connected to a microbial treatment system; the microbial activity maintenance system for on-site treatment of runoff wastewater includes: a treatment unit, a first storage unit, a hydrolysis unit, a separation unit, and a second storage unit; the inlet side of the first storage unit is connected to the outlet side of the treatment unit, and the outlet side is connected to the inlet side of the hydrolysis unit; the inlet side of the separation unit is connected to the outlet side of the hydrolysis unit, and the outlet side is connected to the inlet side of the second storage unit; the treatment unit is used to treat the runoff wastewater to be treated to obtain a first sludge mixture, and to transfer the first sludge mixture to the first storage unit. The system comprises: a storage unit for storing a first sludge mixture, which is a mixture of treated runoff wastewater and particulate pollutants after treatment by the treatment unit; a hydrolysis unit for receiving the first sludge mixture from the first storage unit and hydrolyzing it to obtain a second sludge mixture containing dissolved organic matter and volatile fatty acids, and then transferring the second sludge mixture to a separation unit; a separation unit for separating the second sludge mixture to obtain a hydrolysate, and then transferring the hydrolysate to a second storage unit for storage, the hydrolysate containing dissolved organic matter and volatile fatty acids; and a second storage unit for transferring the hydrolysate to a microbial treatment system.

[0005] The microbial activity maintenance system for on-site treatment of runoff wastewater provided by this invention fully intercepts a large number of particulate pollutants contained in rainwater runoff through the treatment unit, and further hydrolyzes and acidifies them in the hydrolysis unit into a hydrolysate containing soluble organic matter and volatile fatty acids that is easily utilized by microorganisms. Thus, during the dry season, the obtained hydrolysate is transferred to the microbial treatment system to maintain the activity of sludge in the microbial treatment system. At the same time, the hydrolysis method not only helps to avoid the increase in operating costs caused by supplementing carbon sources during the dry season, but also realizes the resource utilization of pollutants, reduces chemical consumption, and conforms to the concept of low carbon and environmental protection.

[0006] In one optional embodiment, the runoff wastewater on-site treatment microbial activity maintenance system further includes: an online control unit and a hydrolysate outlet switch device, wherein the hydrolysate outlet switch device is connected to the outlet side of the second storage unit; the online control unit is connected to the hydrolysate outlet switch device and is used to control the hydrolysate outlet switch device.

[0007] This invention controls the hydrolysate outlet switch device through an online control unit, thereby controlling the transmission of hydrolysate from the second storage unit to the microbial treatment system.

[0008] In one optional embodiment, the online control unit is also connected to the processing unit; the processing unit is further configured to send rainwater runoff monitoring data to the online control unit; the online control unit is further configured to control the hydrolysate outlet switch device to open when it does not receive rainwater runoff monitoring data sent by the processing unit within a preset time period, so that the hydrolysate stored in the second storage unit is transferred to the microbial treatment system.

[0009] The online control unit of this invention determines whether to open the hydrolysate outlet switch device by judging whether it receives rainwater runoff monitoring data sent by the processing unit within a preset time period. This solves the problem that the microbial treatment system cannot maintain sludge activity due to water shortage during non-rainy periods, i.e., within a preset time period, and cannot immediately restore operational stability when rainwater runoff occurs.

[0010] In one optional embodiment, the on-site treatment microbial activity maintenance system for runoff wastewater further includes: a microwave heating unit, the inlet side of which is connected to the outlet side of the first storage unit, and the outlet side of which is connected to the inlet side of the hydrolysis unit, for receiving the first sludge mixture transmitted by the first storage unit; the microwave heating unit includes a temperature monitoring device and a microwave generator, both of which are located on the top of the microwave heating unit; the temperature monitoring device is used to monitor the temperature of the first sludge mixture and obtain a temperature monitoring value; the microwave generator is used to heat the first sludge mixture.

[0011] The present invention utilizes a microwave generator in a microwave heating unit to heat the first sludge mixture, thereby increasing the hydrolysis rate of the first sludge mixture in the hydrolysis unit.

[0012] In one optional implementation, the temperature monitoring device and the microwave generator are respectively connected to an online control unit; the online control unit is also used to receive the temperature monitoring value sent by the temperature monitoring device, and to control the microwave generator to turn on when the temperature monitoring value is less than a preset temperature threshold.

[0013] When the temperature monitoring value of the first sludge mixture is less than a preset temperature threshold, the online control unit of this invention controls the microwave generator to turn on and heat the first sludge mixture. This increases the hydrolysis rate of the first sludge mixture in the hydrolysis unit and avoids the waste of electricity caused by keeping the microwave generator on for a long time.

[0014] In one optional embodiment, the hydrolysis unit includes a stirring device disposed at the top of the hydrolysis unit for stirring the first sludge mixture, so that the sludge in the first sludge mixture is in a suspended mixed state.

[0015] The present invention utilizes a stirring device to keep the sludge in the first sludge mixture in a suspended mixed state, which can improve the hydrolysis efficiency of the hydrolysis unit.

[0016] In one alternative embodiment, the separation unit includes a skimming device for dewatering and concentrating the second sludge mixture to obtain separated hydrolysate and concentrated sludge.

[0017] This invention utilizes a skimming device to separate sludge from hydrolysate in a second sludge mixture.

[0018] In one alternative implementation, the separation unit is also used to transfer the concentrated sludge to the corresponding sludge treatment plant.

[0019] This invention transfers the separated concentrated sludge to the corresponding sludge treatment plant for processing, which reduces environmental pollution and saves costs by reducing the amount of sludge to be treated due to sludge concentration.

[0020] In one optional embodiment, the processing unit includes: a filtration subunit, an inlet subunit, an outlet subunit, and a backwashing subunit. The filtration subunit is connected to the inlet subunit, the outlet subunit, and the backwashing subunit, respectively. The filtration subunit is used to receive the runoff wastewater to be treated transmitted from the inlet subunit, filter the runoff wastewater to be treated to obtain first runoff wastewater, and transmit the first runoff wastewater to the outlet subunit for storage. The outlet subunit is also used to transmit the first runoff wastewater to the filtration subunit when a backwashing operation is performed. The backwashing subunit is used to transmit backwashing gas to the filtration subunit when a backwashing operation is performed.

[0021] This invention achieves the interception of particulate pollutants in rainwater runoff through a filtration subunit; the first runoff wastewater is transmitted to the filtration subunit through the effluent subunit, flushing out the particulate pollutants intercepted by the filtration subunit, providing the first sludge mixture to the hydrolysis unit; furthermore, the backwashing operation of the backwashing subunit is combined to achieve the regeneration of the filter media filled in the filtration subunit.

[0022] In one optional embodiment, the filtration subunit includes a filtration chamber, filter media, and at least one movable porous plate; the water inlet subunit includes a water inlet, a first liquid flow monitoring device, a first particulate pollutant concentration monitoring device, and a particulate pollutant particle size monitoring device; the water outlet subunit includes a water outlet, a second liquid flow monitoring device, a second particulate pollutant concentration monitoring device, a water storage device, a drain outlet, and a return water outlet; and the backwashing subunit includes an air inlet, an aeration device, and a washing water outlet.

[0023] The present invention, through a processing unit including the above-mentioned device, can efficiently intercept particulate pollutants of different sizes in the runoff wastewater to be treated, and after backwashing, the first runoff wastewater is transferred to the filtration subunit to flush out the particulate pollutants intercepted by the filtration subunit, providing sufficient mud-water mixture for the hydrolysis unit. Moreover, compared with high-efficiency clarification technology, it avoids the problem of using large amounts of coagulants and flocculants, which helps to reduce operating costs.

[0024] In one alternative implementation, the online control unit is further configured to receive a dataset of runoff wastewater to be treated sent by the influent subunit, and adjust the position of each active perforated plate in the filter subunit based on the dataset of runoff wastewater to be treated.

[0025] The online control unit of this invention adjusts the position of each movable perforated plate in the filter subunit in combination with the data set of the runoff to be treated. This can not only avoid clogging caused by the runoff to be treated containing a large number of large-diameter particles, but also efficiently filter the small-diameter particulate pollutants in the runoff to be treated. This realizes multi-stage filtration of the runoff to be treated and improves the quality of the effluent.

[0026] In one optional implementation, the online control unit is further configured to receive a first runoff wastewater dataset sent by the inlet subunit and a second runoff wastewater dataset sent by the effluent subunit, and determine the particulate pollutant retention amount based on the first runoff wastewater dataset and the second runoff wastewater dataset; the online control unit is further configured to control the amount of backwash gas based on the particulate pollutant retention amount, and to control the position of each movable perforated plate in the filter subunit based on the particulate pollutant retention amount.

[0027] The online control unit of this invention controls the amount of backwash gas by combining the amount of particulate pollutant retained, thereby achieving precise aeration and reducing aeration energy consumption while fully realizing backwashing and regeneration of the filter media.

[0028] Secondly, the present invention provides a method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater, used in the on-site runoff wastewater treatment microorganism activity maintenance system provided by the present invention, wherein the on-site runoff wastewater treatment microorganism activity maintenance system is connected to a microbial treatment system; the method includes: a treatment unit in the on-site runoff wastewater treatment microorganism activity maintenance system treats the runoff wastewater to be treated to obtain a first sludge mixture, and transfers the first sludge mixture to a first storage unit in the on-site runoff wastewater treatment microorganism activity maintenance system for storage; a hydrolysis unit in the on-site runoff wastewater treatment microorganism activity maintenance system receives the first sludge mixture transferred from the first storage unit and hydrolyzes the first sludge mixture to obtain a second sludge mixture containing dissolved organic matter and volatile fatty acids, and transfers the second sludge mixture to a separation unit in the on-site runoff wastewater treatment microorganism activity maintenance system; the separation unit separates the sludge and hydrolysate in the second sludge mixture to obtain a hydrolysate, and transfers the hydrolysate to a second storage unit for storage, the hydrolysate containing dissolved organic matter and volatile fatty acids; the second storage unit transfers the hydrolysate to the microbial treatment system.

[0029] The method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater provided by this invention utilizes the microbial activity maintenance system for on-site treatment of runoff wastewater provided by this invention to treat runoff wastewater, obtaining a hydrolysate containing dissolved organic matter and volatile fatty acids. The obtained hydrolysate can be transferred to the microbial treatment system during the dry season to maintain the activity of sludge in the microbial treatment system. At the same time, obtaining carbon sources by hydrolyzing pollutants not only helps to avoid the increase in operating costs caused by supplementing carbon sources during the dry season, but also realizes the resource utilization of pollutants, reduces chemical consumption, and conforms to the concept of low carbon and environmental protection.

[0030] In one optional implementation, the second storage unit transfers the hydrolysate to the microbial treatment system, including: when the online control unit in the runoff wastewater on-site treatment microbial activity maintenance system does not receive rainwater runoff monitoring data sent by the treatment unit within a preset time period, it controls the hydrolysate outlet switch device in the runoff wastewater on-site treatment microbial activity maintenance system to open, so that the hydrolysate stored in the second storage unit is transferred to the microbial treatment system.

[0031] This invention solves the problems of microbial treatment systems being unable to maintain sludge activity during non-rainy periods, i.e., within a preset time period, due to water shortage, and being unable to immediately restore operational stability when rainwater runoff occurs.

[0032] In an optional embodiment, before the hydrolysis unit in the runoff wastewater on-site treatment microbial activity maintenance system receives the first sludge mixture transmitted by the first storage unit, the method further includes: the first storage unit transmitting the first sludge mixture to the microwave heating unit in the runoff wastewater on-site treatment microbial activity maintenance system; a temperature monitoring device in the microwave heating unit monitoring the temperature value of the first sludge mixture and sending the temperature value to the online control unit; when the temperature value is less than a preset temperature threshold, the online control unit controlling the microwave generator in the microwave heating unit to turn on; and using the microwave generator to heat the first sludge mixture.

[0033] This invention improves the hydrolysis rate of the first sludge mixture in the hydrolysis unit, while also avoiding the energy waste caused by keeping the microwave generator running for a long time. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a structural block diagram of a microbial activity maintenance system for on-site treatment of runoff wastewater according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of a microbial activity maintenance system for on-site treatment of runoff wastewater according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of an active perforated plate structure according to an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the working process of a treatment unit in a microbial activity maintenance system for on-site treatment of runoff wastewater according to an embodiment of the present invention.

[0039] Figure 5 This is a schematic diagram of the control logic of the microbial activity maintenance system for on-site treatment of runoff wastewater according to an embodiment of the present invention;

[0040] Figure 6 This is a schematic flowchart of a method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater according to an embodiment of the present invention.

[0041] Figure 7 This is a schematic flowchart of another method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater according to an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] This invention provides a microbial activity maintenance system for on-site treatment of runoff wastewater. The system is connected to a microbial treatment system and fully utilizes particulate pollutants in rainwater runoff to hydrolyze and acidify them into soluble organic matter and volatile fatty acids that are easily utilized by microorganisms. This achieves the effect of maintaining the activity of sludge in the microbial treatment system during the dry season.

[0044] According to an embodiment of the present invention, a system for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater is provided. Figure 1 This is a structural block diagram of a microbial activity maintenance system for on-site treatment of runoff wastewater according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a microbial activity maintenance system for on-site treatment of runoff wastewater according to an embodiment of the present invention, as shown below. Figure 1 As shown, the runoff wastewater on-site treatment microbial activity maintenance system 1 is connected to the microbial treatment system 2. The runoff wastewater on-site treatment microbial activity maintenance system 1 includes: a treatment unit 11, a first storage unit 12, a microwave heating unit 13, a hydrolysis unit 14, a separation unit 15, a second storage unit 16, an online control unit 17, and a hydrolysate outlet switch device 18.

[0045] The water inlet side of the first storage unit 12 is connected to the water outlet side of the processing unit 11, and the water outlet side is connected to the water inlet side of the microwave heating unit 13; the water outlet side of the microwave heating unit 13 is connected to the water inlet side of the hydrolysis unit 14; the water inlet side of the separation unit 15 is connected to the water outlet side of the hydrolysis unit 14, and the water outlet side is connected to the water inlet side of the second storage unit 16.

[0046] It should be understood that the system may also include other devices and equipment.

[0047] Specifically, the processing unit 11 includes: a filtration subunit 111, an inlet subunit 112, an outlet subunit 113, and a backwashing subunit 114.

[0048] The filter subunit 111 is connected to the water inlet subunit 112, the water outlet subunit 113 and the backwashing subunit 114 respectively.

[0049] Furthermore, the filter subunit 111 includes: a filter chamber 1111, filter media 1112, and movable porous plates 1113. The number of movable porous plates is not specifically limited; this embodiment includes three movable porous plates, such as... Figure 2 As shown.

[0050] Furthermore, the water inlet subunit 112 includes: a water inlet 1121, a first liquid flow monitoring device 1122, a first particulate pollutant concentration monitoring device 1123, and a particulate pollutant particle size monitoring device 1124.

[0051] In this embodiment of the invention, the first liquid flow monitoring device 1122 is a flow meter; the first particulate pollutant concentration monitoring device 1123 is a particulate matter concentration monitor; and the particulate pollutant particle size monitoring device 1124 is a particulate matter particle size monitor. Figure 2 As shown.

[0052] Furthermore, the specific locations and connections of the aforementioned devices in the water inlet subunit 112 are detailed in [reference needed]. Figure 2 .

[0053] The water outlet subunit 113 includes: an outlet 1131, a second liquid flow monitoring device 1132, a second particulate pollutant concentration monitoring device 1133, a water storage device 1134, a drain outlet 1135, and a return water outlet 1136.

[0054] In this embodiment of the invention, the second liquid flow monitoring device 1132 is a flow meter; the second particulate pollutant concentration monitoring device 1133 is a particulate matter concentration monitor; and the water storage device 1134 is a water storage tank, such as... Figure 2 As shown.

[0055] Furthermore, the specific locations and connections of the aforementioned devices in the water outlet subunit 113 are detailed in [reference needed]. Figure 2 .

[0056] The backwashing subunit 114 includes an air inlet 1141, an aeration device 1142, and a washing water outlet 1143.

[0057] In this embodiment of the invention, the aeration device 1142 is an aeration pump, such as... Figure 2 As shown.

[0058] Furthermore, the specific locations and connections of the aforementioned devices in the backwashing subunit 114 are detailed in [reference needed]. Figure 2 .

[0059] The microwave heating unit 13 includes a temperature monitoring device 131 and a microwave generator 132.

[0060] Among them, temperature monitoring device 131 represents a device for monitoring temperature, such as a temperature monitor; microwave generator 132 represents a microwave heating device.

[0061] Specifically, the temperature monitoring instrument and the microwave generator are respectively installed on the top of the microwave heating unit, such as... Figure 2 As shown.

[0062] Hydrolysis unit 14 includes a stirring device 141, which is disposed on top of hydrolysis unit 14. The specific structural installation location is as follows: Figure 2 As shown.

[0063] Separation unit 15 includes: a skimming device 152, the specific location of which is detailed in [reference needed]. Figure 2 .

[0064] Furthermore, the function of each device in the above system will be explained.

[0065] Preferably, the processing unit 11 is used to treat the runoff wastewater to be treated to obtain a first sludge mixture, and to transfer the first sludge mixture to the first storage unit 12 for storage.

[0066] First, the filtration subunit 111 in the processing unit 11 receives the runoff wastewater to be treated transmitted by the inlet subunit 112, filters the runoff wastewater to be treated to obtain the first runoff wastewater, and transmits the obtained first runoff wastewater to the outlet subunit 113 for storage.

[0067] Specifically, the filter media in the filter subunit 111 is a compressible polymer material such as polyethylene and polyurethane, which is filled in three layers, each layer containing an equal amount of filter media, separated by a movable perforated plate. It can be compressed by the movable perforated plate to form a filter bed with different porosities, thereby achieving graded and efficient filtration of particulate pollutants of different particle sizes.

[0068] The wastewater to be treated flows into the filtration chamber 1111 of the filtration subunit 111 through the inlet 1121 of the inlet subunit 112. It then passes through the filter media 1112 and three movable perforated plates 1113 to filter the wastewater, resulting in filtered first-stage wastewater. Further, the first-stage wastewater flows into the water storage device 1134 through the outlet 1131 for storage. The three movable perforated plates 1113 divide the filter media 1112 into upper, middle, and lower layers.

[0069] Secondly, during the backwashing operation, the effluent subunit 113 transmits the first runoff wastewater to the filtration subunit 111, and the backwashing subunit 114 transmits backwashing gas to the filtration subunit 111. Furthermore, the backwashing operation on the filter media 1112 is achieved through the first runoff wastewater and the backwashing gas. The backwashing gas can be generated by the aeration device 1142.

[0070] The first runoff wastewater and particulate pollutant sludge mixture was obtained through the effluent subunit and the filtration subunit. The filter media was regenerated through the filtration subunit, the effluent subunit, and the backwashing subunit.

[0071] Furthermore, the position of each movable perforated plate 1113 can be adjusted using the online control unit 17, so that the filter media 1112 of the upper, middle and lower layers can be compressed into a filter bed with different porosities.

[0072] Specifically, the online control unit 17 can receive an influent flow rate dataset based on the runoff wastewater to be treated sent by the influent subunit 112, and control the position of each movable porous plate 1113 in the filter chamber 1111 according to the influent flow rate dataset. By adjusting the position of each movable porous plate 1113, the upper, middle and lower layers of filter media 1112 can be compressed into a filter bed with different porosities. The influent flow rate dataset of the runoff wastewater to be treated may include influent flow rate, influent particulate matter concentration and influent particulate matter size, which can be monitored by the first liquid flow rate monitoring device 1122, the first particulate pollutant concentration monitoring device 1123 and the particulate pollutant size monitoring device 1124, respectively.

[0073] The online control unit 17 can obtain the optimal parameters for regulating each active perforated plate 1113 through machine learning.

[0074] By filtering the runoff wastewater through each filter bed, particulate pollutants of different sizes in the runoff wastewater can be effectively and efficiently intercepted. This not only avoids clogging caused by runoff wastewater containing a large number of large-sized particles, but also efficiently filters smaller-sized particulate pollutants in the runoff wastewater, achieving multi-stage filtration of the runoff wastewater and improving the quality of the effluent.

[0075] Furthermore, the online control unit 17 can also control the amount of backwash gas generated by the aeration device 1142 in the backwash subunit 114 based on the particulate pollutant retention rate. This achieves precise aeration while fully realizing backwashing, reducing aeration energy consumption. The particulate pollutant retention rate can be calculated based on the influent flow rate and influent particulate concentration of the runoff to be treated sent by the influent subunit 112, and the effluent flow rate and effluent particulate concentration of the filtered runoff to be treated sent by the effluent subunit 113. The effluent flow rate and effluent particulate concentration of the filtered runoff to be treated can be monitored by the second liquid flow monitoring device 1132 and the second particulate pollutant concentration monitoring device 1133, respectively.

[0076] The online control unit 17 can also obtain the optimal parameters for regulating the amount of backflushing gas through machine learning.

[0077] Furthermore, before the backwashing operation of the filter media 1112 is carried out through the first runoff sewage and backwash gas, the online control unit 17 can also readjust the position of each movable perforated plate 1113 according to the amount of particulate pollutants retained, so that the filter media 1112 in the upper, middle and lower layers expand, increase the contact area between the filter media and the backwash gas, and improve the backwashing efficiency.

[0078] Finally, after the above backwashing operation, the mixture of the first runoff wastewater and the particulate pollutants flushed out from the filter media 1112 is used as the first sludge mixture, and the first sludge mixture is transferred to the first storage unit 12 for storage.

[0079] The above-mentioned treatment unit 11 can efficiently intercept particulate pollutants of different sizes in the runoff wastewater to be treated. By returning the first runoff wastewater to the filtration subunit, the particulate pollutants intercepted by the filtration subunit are flushed out, providing sufficient substrate for the hydrolysis unit. Moreover, compared with high-efficiency clarification technology, it avoids the problem of using a large amount of coagulants and flocculants, which helps to reduce operating costs.

[0080] Preferably, the hydrolysis unit 14 is used to receive the first sludge mixture transmitted by the first storage unit 12, and hydrolyze the first sludge mixture to obtain a second sludge mixture containing dissolved organic matter and volatile fatty acids, and then transmit the second sludge mixture to the separation unit 15.

[0081] First, the first storage unit 12 transfers the stored first sludge mixture to the hydrolysis unit 14;

[0082] Then, the hydrolysis unit 14 hydrolyzes the first sludge mixture, causing it to decompose and release soluble organic matter and volatile fatty acids that are easily utilized by microorganisms. In other words, a second sludge mixture containing the soluble organic matter and volatile fatty acids can be obtained through hydrolysis.

[0083] The second sludge mixture, containing dissolved organic matter and volatile fatty acids, produced by the hydrolysis unit can be used to maintain the activity of sludge in the microbial treatment system during the dry season. Simultaneously, the carbon source generated through hydrolysis not only helps avoid increased operating costs associated with supplementing carbon sources during the dry season but also achieves pollutant resource utilization, reduces chemical consumption, and aligns with low-carbon and environmentally friendly principles.

[0084] Furthermore, during the hydrolysis of the first sludge mixture, the stirring device 141 can be used to simultaneously stir the first sludge mixture, so that the sludge in the first sludge mixture is in a suspended mixed state, thereby accelerating the hydrolysis of the first sludge mixture.

[0085] In this example, the stirring speed of the stirring device 141 is 350-450 rpm / min; the sludge hydrolysis time is 3-4 days.

[0086] Preferably, a microwave heating unit 13 is provided between the first storage unit 12 and the hydrolysis unit 14, which can improve the hydrolysis efficiency of the hydrolysis unit 14.

[0087] First, the first storage unit 12 transfers the stored first sludge mixture to the microwave heating unit 13;

[0088] Then, the temperature monitoring device 131 in the microwave heating unit 13 monitors the temperature of the first sludge mixture, obtains the current temperature monitoring value of the first sludge mixture, and sends the temperature monitoring value to the online control unit 17.

[0089] After receiving the current temperature monitoring value, the online control unit 17 compares the current temperature monitoring value with a preset temperature threshold. When the current temperature monitoring value is lower than the preset temperature threshold, the online control unit 17 controls the microwave generator 132 in the microwave heating unit 13 to turn on and use the microwave generator 132 to heat the first sludge mixture until the heated temperature reaches the preset temperature threshold, at which point heating stops. This control method improves the hydrolysis rate of the first sludge mixture in the hydrolysis unit and also avoids the energy waste caused by the microwave generator being turned on for a long time.

[0090] Finally, the microwave heating unit 13 transfers the heated first sludge mixture to the hydrolysis unit 14 for hydrolysis, thereby improving the hydrolysis efficiency.

[0091] Preferably, the separation unit 15 is used to separate the second sludge mixture to obtain hydrolysate, and then transfer the hydrolysate to the second storage unit 16 for storage.

[0092] First, the hydrolysis unit 14 transfers the hydrolyzed second sludge mixture to the separation unit 15;

[0093] Then, the skimming device 152 in the separation unit 15 dehydrates and concentrates the second sludge mixture, separating it into hydrolysate and concentrated sludge. The hydrolysate contains dissolved organic matter and volatile fatty acids.

[0094] Finally, the separated hydrolysate is transferred to the second storage unit 16 for storage; the concentrated sludge is transferred to the corresponding sludge treatment plant for processing, thereby reducing environmental pollution.

[0095] Furthermore, the hydrolysate stored in the second storage unit 16 can be transferred to the corresponding microbial treatment system 2 under specific conditions via the hydrolysate outlet switch device 18 to maintain the activity of the sludge in the microbial treatment system. The microbial treatment system 2 is connected to the runoff wastewater on-site treatment microbial activity maintenance system 1 via the hydrolysate outlet switch device 18.

[0096] Specifically, the first liquid flow monitoring device 1122 in the water inlet subunit 112 of the processing unit 11 can monitor rainwater runoff data in real time and send the monitored rainwater runoff data to the online control unit 17.

[0097] Furthermore, when the online control unit 17 does not receive rainwater runoff monitoring data sent by the processing unit 11 within a preset time period, it indicates that there has been no rainfall within the preset time period. At this time, the online control unit 17 controls the hydrolysate outlet switch device 18 to open, so that the hydrolysate stored in the second storage unit 16 is transferred to the microbial treatment system 2. Conversely, if the online control unit 17 can always receive rainwater runoff monitoring data sent by the processing unit 11, it is not necessary to maintain the activity of the sludge in the microbial treatment system, that is, the online control unit 17 controls the hydrolysate outlet switch device 18 to be in the closed state.

[0098] By controlling the hydrolysate outlet switch device 18 through the online control unit 17, the problems of the microbial treatment system being unable to maintain its activity due to water shortage during non-rainy periods, i.e., within a preset time period, and being unable to immediately restore operational stability when rain causes runoff are solved.

[0099] Preferably, in one embodiment, a system for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater is provided, comprising: a particulate matter filtration unit, a sludge storage unit, a microwave heating unit, a sludge hydrolysis unit, a sludge-water separation unit, a hydrolysate storage unit, and an online control unit.

[0100] Specifically, the particulate matter filtration unit is used to intercept particulate pollutants in rainwater runoff and to provide a sludge-water mixture for the sludge hydrolysis unit. It includes an inlet, a filter chamber, filter media, a movable perforated plate, an outlet, a water storage tank, a backwash air inlet, and a wash water outlet.

[0101] The inlet is connected to the outlet of the rainwater storage tank, and a flow monitoring instrument, a particulate matter concentration monitoring instrument, and a particulate matter size monitoring instrument are installed on it to monitor the inflow rate, particulate matter concentration, and particle size in real time.

[0102] The filtration chamber is a reactor filled with filter media and used to filter runoff wastewater.

[0103] The filter media is made of compressible polymer materials such as polyethylene and polyurethane, and consists of three layers, each filled with an equal amount of filter media, separated by movable perforated plates. The media can be compressed by the movable perforated plates to form filter beds with different porosities, thereby achieving graded and efficient filtration of particulate pollutants of different particle sizes.

[0104] like Figure 3As shown, the movable perforated plate has multiple flow holes, which can both separate and intercept filter media and allow sewage to flow through. At the same time, it has a movable property. On the one hand, its height is adjusted by the online control system according to the concentration and particle size of sewage particles, thereby compressing the upper, middle and lower layers of filter media into a filter bed with different porosities. The degree of compression is upper layer > middle layer > lower layer, that is, the porosity of the filter bed decreases from the lower layer to the upper layer. On the other hand, it can make the compressed filter media relax during the backwashing stage, thereby increasing the contact area with the backwashing gas and improving the backwashing efficiency.

[0105] A flow meter and a particulate matter concentration monitor are installed on the outlet and connected to the water storage tank. The water storage tank is used to store the filtered wastewater as washing water for backwashing. Its effective volume is 2 to 3 times that of the filter chamber to meet the water requirements for 2 to 3 backwashes of the chamber. There is a backwash water return port at the bottom.

[0106] The backwash air inlet is located at the lower right of the filter chamber and is used to introduce backwash gas, which is provided by the aeration device. It is closed during the filtration stage and opened during the backwash stage. The aeration volume can be adjusted by regulating the output power according to the total amount of particulate pollutants trapped, so as to achieve precise aeration and reduce energy consumption.

[0107] Specifically, the workflow of the above-mentioned filtering unit is as follows: Figure 4 As shown.

[0108] The washing water outlet is located on the upper right side of the filter chamber and is used to discharge backwash wastewater carrying particulate matter into the sludge storage unit.

[0109] The sludge storage unit is connected to the wash water outlet of the particulate filter unit and is used to store the mixture of backwash wastewater and particulate pollutants trapped by the particulate filter unit during the backwashing process.

[0110] The microwave heating unit is used to heat the sludge hydrolysis unit and includes a microwave generator, a microwave reaction cavity, and a temperature monitoring instrument.

[0111] The temperature monitor is used to monitor the temperature of the hydrolysis unit in real time. When the temperature is below 25°C and the hydrolysis efficiency is low, the microwave generator is turned on. When the temperature reaches 25°C, the microwave generator stops running. It is controlled by the online control unit.

[0112] The sludge hydrolysis unit is connected to the microwave heating unit, and a stirrer is installed on the top to keep the sludge mixture in a suspended state. The stirring speed is 350-450 rpm / min; the sludge hydrolysis time is 3-4 days.

[0113] The mud-water separation unit is connected to the sludge hydrolysis unit and is equipped with a skimming device for dewatering and concentrating the hydrolyzed sludge. The hydrolysate is discharged into the hydrolysate storage unit, and the concentrated sludge is transported to the treatment and disposal site.

[0114] The hydrolysate storage unit is used to store hydrolysate rich in soluble organic matter. Its outlet is connected to the microbial treatment unit. When there is no rainfall for three consecutive days, the hydrolysate enters the microbial treatment unit to maintain the activity of microorganisms. This process is controlled by an online control unit.

[0115] The online control unit is used to adjust the porosity of the filter bed in the rapid filtration unit, the power of the backwash aeration device in the particulate filtration unit, the opening and closing of the microwave generator in the microwave heating unit, and the outlet valve of the hydrolysate storage unit.

[0116] Among them, the optimal parameters for adjusting the porosity of the filter bed in the rapid filtration unit and the power of the backwash aeration device are obtained based on machine learning. The control principle is as follows: (1) By combining the influent flow rate, particulate matter concentration and particulate matter size, the height of the movable perforated plate is adjusted so that the upper, middle and lower layers of filter media are compressed into filter beds with different porosities; (2) By combining the influent and effluent flow rates and particulate matter concentration, the amount of particulate pollutants retained is calculated, and the power and aeration volume of the aeration device in the backwash process and the aerobic reaction process are controlled.

[0117] Specifically, the control logic for the microwave generator of the microwave heating unit is as follows: when the temperature of the mud-water mixture containing particulate pollutants is measured by the temperature monitor to be below 25°C, the microwave generator is turned on for heating; otherwise, the microwave generator is turned off.

[0118] The control logic for the outlet switch of the hydrolysate storage unit is as follows: when the inlet flow monitor does not detect any rainwater runoff for three consecutive days, the outlet valve of the hydrolysate is opened to allow the hydrolysate to flow to the microbial treatment unit; otherwise, the outlet switch of the hydrolysate storage unit is closed.

[0119] Specifically, the control logic of the above-mentioned on-site treatment system for maintaining the activity of microorganisms in runoff wastewater is as follows: Figure 5 As shown.

[0120] According to an embodiment of the present invention, a method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0121] This embodiment provides a method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater, which can be used in the above-mentioned system for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater, and the system for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater is connected to the microbial treatment system. Figure 6 This is a flowchart of a method for maintaining the activity of microorganisms in on-site treatment of runoff wastewater according to an embodiment of the present invention, such as... Figure 6As shown, the process includes the following steps:

[0122] In step S601, the treatment unit in the runoff wastewater on-site treatment microbial activity maintenance system treats the runoff wastewater to be treated to obtain a first sludge mixture, and then transfers the first sludge mixture to the first storage unit in the runoff wastewater on-site treatment microbial activity maintenance system for storage.

[0123] The specific implementation process is described above in the structural and functional description of the treatment unit 11 in the on-site treatment microbial activity maintenance system 1 for runoff sewage, as well as the description of the interaction process between the treatment unit 11 and the first storage unit 12, and will not be repeated here.

[0124] In step S602, the hydrolysis unit in the runoff wastewater on-site treatment microbial activity maintenance system receives the first sludge mixture transmitted from the first storage unit, hydrolyzes the first sludge mixture to obtain a second sludge mixture containing dissolved organic matter and volatile fatty acids, and transmits the second sludge mixture to the separation unit in the runoff wastewater on-site treatment microbial activity maintenance system.

[0125] The specific implementation process is described above in the structural and functional description of the hydrolysis unit 14 in the on-site treatment microbial activity maintenance system 1 for runoff wastewater, as well as the interactive process description between the hydrolysis unit 14 and the separation unit 15, and will not be repeated here.

[0126] In step S603, the separation unit separates the second sludge mixture to obtain hydrolysate, and transfers the hydrolysate to the second storage unit for storage. The hydrolysate contains dissolved organic matter and volatile fatty acids.

[0127] The specific implementation process is described above in the structural and functional description of the separation unit 15 in the on-site treatment microbial activity maintenance system 1 for runoff sewage, as well as the interaction process description of the separation unit 15 and the second storage unit 16, and will not be repeated here.

[0128] In step S604, the second storage unit transfers the hydrolysate to the microbial treatment system.

[0129] The specific implementation process is described above in the interaction process between the second storage unit 16 and the microbial treatment system in the on-site treatment microbial activity maintenance system 1 for runoff sewage, and will not be repeated here.

[0130] The method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater provided in this embodiment utilizes the microbial activity maintenance system for on-site treatment of runoff wastewater provided by this invention to treat runoff wastewater. It makes full use of the intercepted particulate pollutants to obtain a hydrolysate containing dissolved organic matter and volatile fatty acids. During the dry season, the hydrolysate can be transferred to the microbial treatment system to maintain the activity of sludge in the microbial treatment system. At the same time, obtaining carbon sources by hydrolyzing pollutants not only helps to avoid the increase in operating costs caused by supplementing carbon sources during the dry season, but also realizes the resource utilization of pollutants, reduces chemical consumption, and conforms to the concept of low carbon and environmental protection.

[0131] This embodiment provides a method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater, which can be used in the above-mentioned system for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater, and the system for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater is connected to the microbial treatment system. Figure 7 This is a flowchart of a method for maintaining the activity of microorganisms in on-site treatment of runoff wastewater according to an embodiment of the present invention, such as... Figure 7 As shown, the process includes the following steps:

[0132] Step S701: In the runoff wastewater on-site treatment microbial activity maintenance system, the treatment unit processes the runoff wastewater to be treated to obtain a first sludge mixture, which is then transferred to the first storage unit of the runoff wastewater on-site treatment microbial activity maintenance system for storage. The first sludge mixture is a mixture of the runoff wastewater to be treated and particulate pollutants after treatment by the treatment unit. For details, please refer to... Figure 6 Step S601 of the illustrated embodiment will not be described again here.

[0133] In step S702, the first storage unit transfers the first sludge mixture to the microwave heating unit in the runoff wastewater on-site treatment microbial activity maintenance system.

[0134] The specific implementation process is described above for the interaction process between the first storage unit 12 and the microwave heating unit 13 in the on-site treatment microbial activity maintenance system 1 for runoff sewage, and will not be repeated here.

[0135] In step S703, the temperature monitoring device in the microwave heating unit monitors the temperature value of the first sludge mixture and sends the temperature value to the online control unit.

[0136] The specific implementation process is described above in the structural and functional description of the microwave heating unit 13 in the on-site treatment microbial activity maintenance system 1 for runoff sewage, as well as the description of the interaction process between the microwave heating unit 13 and the online control unit 17, and will not be repeated here.

[0137] Step S704: When the temperature value is less than the preset temperature threshold, the online control unit controls the microwave generator in the microwave heating unit to turn on.

[0138] The specific implementation process is described above for the control process of the microwave generator 132 in the microwave heating unit 13 by the online control unit 17 in the microbial activity maintenance system 1 for on-site treatment of runoff sewage, and will not be repeated here.

[0139] Step S705: The first sludge mixture is heated using a microwave generator.

[0140] The specific implementation process is described above for the function of the microwave generator 132 in the on-site treatment microbial activity maintenance system 1 for runoff sewage, and will not be repeated here.

[0141] In step S706, the hydrolysis unit in the runoff wastewater on-site treatment microbial activity maintenance system receives the first sludge mixture transferred from the first storage unit, and hydrolyzes the first sludge mixture to obtain a second sludge mixture containing dissolved organic matter and volatile fatty acids. The second sludge mixture is then transferred to the separation unit in the runoff wastewater on-site treatment microbial activity maintenance system. For details, please refer to [link to details]. Figure 6 Step S602 of the illustrated embodiment will not be described again here.

[0142] In step S707, the separation unit separates the second sludge mixture to obtain hydrolysate, and transfers the hydrolysate to the second storage unit for storage. The hydrolysate contains dissolved organic matter and volatile fatty acids. For details, please refer to [link to details]. Figure 6 Step S603 of the illustrated embodiment will not be described again here.

[0143] In step S708, the second storage unit transfers the hydrolysate to the microbial treatment system.

[0144] Specifically, step S708 includes:

[0145] In step S7081, when the online control unit in the runoff wastewater on-site treatment microbial activity maintenance system does not receive rainwater runoff monitoring data sent by the treatment unit within a preset time period, it controls the hydrolysate outlet switch device in the runoff wastewater on-site treatment microbial activity maintenance system to open, so that the hydrolysate stored in the second storage unit is transferred to the microbial treatment system.

[0146] Specifically, the microbial treatment system 2 is connected to the runoff sewage on-site treatment microbial activity maintenance system 1 via the hydrolysate outlet switch device 18.

[0147] The specific implementation process is described above in the interaction process between the treatment unit 11 and the online control unit 17 in the on-site treatment microbial activity maintenance system 1 for runoff sewage, the control process of the online control unit 17 on the hydrolysate outlet switch device 18, and the interaction process between the second storage unit 16, the hydrolysate outlet switch device 18 and the microbial treatment system 2. It will not be repeated here.

[0148] The method for maintaining the activity of microorganisms in the on-site treatment of runoff wastewater provided in this invention utilizes the on-site microorganism activity maintenance system for runoff wastewater treatment provided by this invention to treat runoff wastewater, obtaining a hydrolysate containing dissolved organic matter and volatile fatty acids. The obtained hydrolysate can be transferred to the microbial treatment system during the dry season to maintain the activity of sludge in the microbial treatment system. At the same time, by generating carbon sources through hydrolysis, it not only helps to avoid the increase in operating costs caused by supplementing carbon sources during the dry season, but also realizes the resource utilization of pollutants, reduces chemical consumption, and conforms to the concept of low carbon and environmental protection.

[0149] Furthermore, it improves the hydrolysis rate of the first sludge mixture in the hydrolysis unit, while also avoiding the energy waste caused by the long-term operation of the microwave generator; it solves the problems that the microbial treatment system cannot maintain its activity due to water shortage during non-rainy periods, i.e., within the preset time period, and cannot immediately restore operational stability when rainwater runoff occurs.

[0150] Preferably, in one example, the filtration process of the above-mentioned on-site runoff wastewater treatment microbial activity maintenance system during rainfall is as follows:

[0151] S1: Close the backwash water inlet and air inlet. The particle size monitoring results of the water inlet show that the particle size of the rainwater runoff is mainly distributed between 10 and 200 μm, and the data is transmitted to the online control system.

[0152] S2: The online control system analyzes the input signal and, based on the machine learning results, adjusts the positions of the three movable perforated plates through the control system so that the porosities of the lower, middle, and upper filter media are 100μm, 50μm, and 10μm, respectively, thereby filtering particles with diameters greater than 100μm, 50-100μm, and 10-50μm. At this time, the washing water outlet is closed, and the filtrate flows from the outlet to the microbial treatment unit.

[0153] Furthermore, the backwashing process of the above-mentioned on-site treatment microbial activity maintenance system for runoff wastewater after rainfall is as follows:

[0154] S1: Air flushing stage, the filter media is flushed with air. The inlet, outlet and washing water outlet of the particulate filter unit are closed. The movable perforated plate is adjusted to make the filter media in a relaxed state. Based on the monitoring results of the liquid flow meter and particulate concentration monitor at the system inlet and outlet, the total amount of particulate matter trapped is calculated in the control system. Combined with the machine learning results, the output power of the aeration device is precisely adjusted to introduce a certain amount of air into the filter chamber. The air disturbance on the filter layer and the shear force formed by the collision and friction between the filter media are used to peel off the particulate matter attached to the surface of the filter media.

[0155] S2: During the simultaneous air and water flushing stage, after the aeration time lasts for 5 minutes, a certain air flushing intensity is maintained to keep the filter layer in a fluidized state. The inlet of the particulate filter unit is opened, and the filtrate is drawn into the filter chamber from the water storage tank through the inlet. The sludge that falls off during the air flushing stage is effectively lifted to the surface of the filter layer by water flushing.

[0156] S3: Water flushing stage. After flushing with air and water for 5 minutes, the aeration device and air inlet are closed. At this time, the filter layer is in an expanded or slightly expanded state. The high concentration of particles above the filter layer is flushed out by a low water flushing intensity. At the same time, the remaining detached particles in the filter layer are further removed, so that the filter layer achieves the purification effect after flushing.

[0157] S4: Washing water is discharged through the washing water outlet and enters the sludge storage unit, where it will be used for sludge hydrolysis to produce soluble organic matter.

[0158] Furthermore, the sludge heating, hydrolysis, concentration, and hydrolysate reuse processes in the above-mentioned on-site runoff wastewater treatment microbial activity maintenance system are as follows:

[0159] S1: The mud-water mixture containing particulate pollutants enters the microwave heating unit through the sludge storage unit. When the temperature monitored by the temperature monitor is higher than 25°C, the mud-water mixture directly enters the sludge hydrolysis unit for S2. When the temperature is lower than 25°C, the microwave generator is turned on by the online control unit to heat the mud-water mixture until the mud-water mixture is higher than 25°C.

[0160] S2: When the mud-water mixture at a temperature above 25°C enters the sludge hydrolysis unit, the stirring is turned on at a speed of 450 rpm / min. Under anaerobic conditions, the sludge is continuously hydrolyzed for 4 days. The cell walls and other tissues of microorganisms are broken down and dissolved, releasing soluble organic matter and volatile fatty acids that are easily utilized by microorganisms. After 4 days, the stirrer is turned off, and the mud-water mixture enters the sludge thickening unit.

[0161] S3: In the thickening unit, the skimming device is turned on to achieve mud-water separation. The supernatant flows into the hydrolysate storage unit, and the thickened sludge is transported to the treatment and disposal site for further processing.

[0162] S4: The supernatant is stored in the hydrolysate storage unit. When the flow monitor at the inlet of the particulate filter unit does not detect rainwater runoff within 3 days, the online control unit controls the opening of the hydrolysate outlet valve to allow the hydrolysate to flow into the microbial on-site treatment system, so as to maintain sludge activity during the dry season and ensure that the microbial on-site treatment system can be started immediately when the next rainfall occurs.

[0163] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A system for maintaining the activity of microorganisms in on-site treatment of runoff sewage, the system being connected to a microbial treatment system; characterized in that, The runoff sewage on-site treatment microorganism activity maintaining system comprises a treatment unit, a first storage unit, a hydrolysis unit, a separation unit and a second storage unit, the water inlet side of the first storage unit is connected with the water outlet side of the treatment unit, and the water outlet side is connected with the water inlet side of the hydrolysis unit; the water inlet side of the separation unit is connected with the water outlet side of the hydrolysis unit, and the water outlet side is connected with the water inlet side of the second storage unit; The treatment unit is used for treating the runoff sewage to be treated to obtain a first sludge mixed solution, and the first sludge mixed solution is transmitted to the first storage unit for storage; The hydrolysis unit is used for receiving the first sludge mixed solution transmitted by the first storage unit, and hydrolyzing the first sludge mixed solution to obtain a second sludge mixed solution containing dissolved organic matter and volatile fatty acids, and transmitting the second sludge mixed solution to the separation unit; The separation unit is used for separating the second sludge mixed solution to obtain a hydrolysis solution containing the dissolved organic matter and the volatile fatty acids, and transmitting the hydrolysis solution to the second storage unit for storage; The second storage unit is used for transmitting the hydrolysis solution to the microorganism treatment system; The runoff sewage on-site treatment microorganism activity maintaining system further comprises: An online control unit and a hydrolysis solution water outlet opening and closing device connected with the water outlet side of the second storage unit; The online control unit is connected with the hydrolysis solution water outlet opening and closing device and used for controlling the hydrolysis solution water outlet opening and closing device; The online control unit is further connected with the treatment unit; The treatment unit is further used for sending rainwater runoff monitoring data to the online control unit; The online control unit is further used for controlling the hydrolysis solution water outlet opening and closing device to open when the rainwater runoff monitoring data sent by the treatment unit is not received within a preset time period, so that the hydrolysis solution stored in the second storage unit is transmitted to the microorganism treatment system; The hydrolysis unit comprises a stirring device arranged at the top of the hydrolysis unit and used for stirring the first sludge mixed solution to make the sludge in the first sludge mixed solution in a suspended mixed state; The separation unit comprises a water skimming device used for dehydrating and concentrating the second sludge mixed solution to obtain the separated hydrolysis solution and concentrated sludge; The treatment unit comprises a filtration subunit, a water inlet subunit, a water outlet subunit and a backwashing subunit, and the filtration subunit is connected with the water inlet subunit, the water outlet subunit and the backwashing subunit respectively; The filtration subunit is used for receiving the runoff sewage to be treated transmitted by the water inlet subunit, filtering the runoff sewage to be treated to obtain first runoff sewage, and transmitting the first runoff sewage to the water outlet subunit for storage; The water outlet subunit is further configured to transmit the stored first runoff sewage to the filtration subunit when backwashing is performed, wherein the first runoff sewage is mixed with the mixture of the particulate pollutants washed out by the filter material in the filtration subunit as the first sludge mixed liquor; The backwashing subunit is configured to transmit backwashing gas to the filtration subunit when backwashing is performed.

2. The runoff sewage on-site treatment microorganism activity maintenance system according to claim 1, characterized in that, The runoff sewage on-site treatment microbial activity maintaining system further comprises: a microwave heating unit, a water inlet side of the microwave heating unit being connected with a water outlet side of the first storage unit, and a water outlet side being connected with a water inlet side of the hydrolysis unit, and configured to receive the first sludge mixed liquor transmitted by the first storage unit; The microwave heating unit comprises a temperature monitoring device and a microwave generator, and the temperature monitoring device and the microwave generator are both arranged on the top of the microwave heating unit; The temperature monitoring device is configured to monitor the temperature of the first sludge mixed liquor to obtain a temperature monitoring value; The microwave generator is configured to heat the first sludge mixed liquor.

3. The runoff sewage on-site treatment microbial activity maintaining system according to claim 2, wherein The temperature monitoring device and the microwave generator are both connected with the online control unit; The online control unit is further configured to receive the temperature monitoring value sent by the temperature monitoring device, and control the microwave generator to be turned on when the temperature monitoring value is less than a preset temperature threshold.

4. The runoff sewage on-site treatment microbial activity maintaining system according to claim 1, wherein The separation unit is further configured to transmit the concentrated sludge to a corresponding sludge treatment site.

5. The runoff sewage on-site treatment microbial activity maintaining system according to claim 1, wherein The filtration subunit comprises a filtration cavity, filter material and at least one movable perforated plate; The water inlet subunit comprises a water inlet, a first liquid flow monitoring device, a first particulate pollutant concentration monitoring device and a particulate pollutant particle size monitoring device; The water outlet subunit comprises a water outlet, a second liquid flow monitoring device, a second particulate pollutant concentration monitoring device, a water storage device, a drain and a backflow water inlet; The backwashing subunit comprises an air inlet, an aeration device and a washing water outlet.

6. The runoff sewage on-site treatment microbial activity maintaining system according to claim 5, wherein The online control unit is further configured to receive a to-be-treated runoff sewage data set sent by the water inlet subunit, and adjust the position of each movable perforated plate in the filtration subunit based on the to-be-treated runoff sewage data set.

7. The runoff sewage on-site treatment microbial activity maintaining system according to claim 5, wherein The online control unit is further configured to receive a first runoff sewage data set sent by the water inlet subunit and a second runoff sewage data set sent by the water outlet subunit, and determine the particulate pollutant interception amount based on the first runoff sewage data set and the second runoff sewage data set. The online control unit is also used to control the amount of backwash gas based on the amount of particulate pollutants retained, and to control the position of each of the movable porous plates in the filter subunit based on the amount of particulate pollutants retained.

8. A method for maintaining the activity of microorganisms in on-site treatment of runoff sewage, using the system for maintaining the activity of microorganisms in on-site treatment of runoff sewage according to any one of claims 1 to 7, which is connected to a microbial treatment system, characterized in that, The method includes: The treatment unit in the runoff wastewater on-site treatment microbial activity maintenance system treats the runoff wastewater to be treated to obtain a first sludge mixture, and then transfers the first sludge mixture to the first storage unit in the runoff wastewater on-site treatment microbial activity maintenance system for storage. The hydrolysis unit in the runoff wastewater on-site treatment microbial activity maintenance system receives the first sludge mixture from the first storage unit, hydrolyzes the first sludge mixture to obtain a second sludge mixture containing dissolved organic matter and volatile fatty acids, and then transfers the second sludge mixture to the separation unit in the runoff wastewater on-site treatment microbial activity maintenance system. The separation unit separates the second sludge mixture to obtain a hydrolysate, and then transfers the hydrolysate to the second storage unit for storage. The hydrolysate contains the dissolved organic matter and the volatile fatty acids. The second storage unit transfers the hydrolysate to the microbial treatment system.

9. The method of claim 8, wherein, The second storage unit transfers the hydrolysate to the microbial treatment system, including: When the online control unit of the on-site runoff wastewater treatment microbial activity maintenance system does not receive rainwater runoff monitoring data sent by the treatment unit within a preset time period, it controls the hydrolysate outlet switch device of the on-site runoff wastewater treatment microbial activity maintenance system to open, so that the hydrolysate stored in the second storage unit is transferred to the microbial treatment system.

10. The method of claim 9, wherein, Before the hydrolysis unit in the on-site runoff wastewater treatment microbial activity maintenance system receives the first sludge mixture transmitted by the first storage unit, the method further includes: The first storage unit transfers the first sludge mixture to the microwave heating unit in the on-site treatment microbial activity maintenance system for runoff wastewater; The temperature monitoring device in the microwave heating unit monitors the temperature value of the first sludge mixture and sends the temperature value to the online control unit; When the temperature value is less than the preset temperature threshold, the online control unit controls the microwave generator in the microwave heating unit to turn on; The first sludge mixture is heated using the microwave generator.

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