Landfill leachate treatment system, treatment method, and readable storage medium

Abstract

The present application belongs to the field of landfill leachate treatment, and particularly relates to a landfill leachate treatment system, a treatment method and a readable storage medium. The landfill leachate treatment system comprises a reaction unit, an adjusting unit and a detection unit. The reaction unit comprises a hydrolysis tank, a first variable tank, a second variable tank, a third variable tank, an MBR membrane tank and a fourth variable tank connected in sequence. The adjusting unit comprises a feeding device, a pipeline assembly and an aeration component, and is used for adjusting parameters in the reaction unit. The detection unit is installed in the reaction unit and is used for detecting parameters in the reaction unit. When in use, the content of the material composition parameters in the corresponding variable tank is detected by the detection unit, the opening or closing of each pipeline is set correspondingly, the reflux of the related substances is realized, and the switching of multiple treatment modes is completed. The device can face different concentrations of sewage, use different treatment steps and processes, and adjust the treatment process as needed.

Description

Technical Field

[0001] This invention relates to the field of landfill leachate treatment technology, specifically to a landfill leachate treatment system, treatment method, and readable storage medium. Background Technology

[0002] Leachate from transfer stations is high-concentration organic wastewater generated during the compression and transfer of municipal solid waste. It is complex in composition, high in pollutant concentrations, contains a large amount of recalcitrant substances, and exhibits significant fluctuations in water quality and quantity. Current treatment processes are often designed with pre-defined influent and effluent qualities in mind. After implementation, they can only adapt to minor changes in influent quality by increasing reagent dosages or adding extra treatment equipment or units, failing to achieve automatic, on-demand adjustment. This leads to increased operating costs over time. When influent quality changes significantly, the original process routes often fail to adapt to large fluctuations, causing the biological treatment system to malfunction and the project to halt.

[0003] Existing adjustable water treatment processes and methods are often applied to ordinary industrial wastewater or rural domestic sewage. Their principle is to manually control and adjust the process route by preset changes in influent water quality to achieve targeted removal of specific pollutants. The specific operation method is simply to change the dissolved oxygen (DO) of the tank by turning on and off the variable unit aeration component or stirring unit, thereby changing the tank function to achieve process adjustability. This method can achieve rapid adaptation and recovery of the tank's biochemical function for low-concentration sewage, but it is not suitable for complex, high-concentration, and difficult-to-degrade organic wastewater such as leachate from garbage transfer stations.

[0004] Because conventional treatment systems have a single processing method and cannot treat leachate of different concentrations, the phenomenon of system paralysis caused by this is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a landfill leachate treatment system, treatment method, and readable storage medium to address the shortcomings of existing water treatment processes that cannot adapt to changes in leachate concentration at landfill transfer stations.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution: In a first aspect, the present invention discloses a landfill leachate treatment system, comprising: include: The reaction unit contains a hydrolysis tank, a first variable tank, a second variable tank, a third variable tank, an MBR membrane tank, and a fourth variable tank, which are connected in sequence. An adjustment unit is configured to adjust parameters in the reaction unit and includes a feeding device and a piping assembly as well as an aeration component connected to the reaction unit. The piping assembly includes a first pipe, a second pipe, a third pipe, a fourth pipe, and a fifth pipe; wherein, The first pipeline connects the hydrolysis tank and the fourth variable tank, and is configured to guide clean water back to the hydrolysis tank; The second pipeline connects the hydrolysis tank and the MBR membrane tank, and is configured to guide sludge back to the hydrolysis tank; The third pipeline connects the first variable tank and the second variable tank, and is configured to guide the nitrified liquid back to the first variable tank; The fourth pipeline connects the second variable tank and the third variable tank, and is configured to guide sludge back to the third variable tank; The fifth pipeline connects the second variable tank, the third variable tank, and the MBR membrane tank, and is configured to guide the nitrification liquid to selectively return to the second variable tank or the third variable tank. A detection unit, wherein the detection unit is installed within the reaction unit and configured to detect parameters in the reaction unit; and A controller, electrically connected to the adjustment unit and the detection unit, is configured to control the adjustment unit to switch processing modes based on a comparison between the parameter values ​​detected by the detection unit and preset values.

[0007] In a further embodiment of the present invention, the feeding device includes a methanogenic bacteria agent feeding unit, a first denitrifying bacteria agent feeding unit, an aerobic microbial agent feeding unit, and a second denitrifying bacteria agent feeding unit; The methanogenic bacteria dosing unit is connected to the first variable tank, the first denitrifying bacteria dosing unit is connected to the second variable tank, and the aerobic microbial bacteria dosing unit and the second denitrifying bacteria dosing unit are connected to the third variable tank. The controller switches the processing mode according to the adjustment unit and controls the feeding equipment to selectively add microbial bacteria to the reaction unit.

[0008] In a further embodiment of the present invention, the aeration components include an MBR membrane tank aeration assembly, an ozone aeration assembly, and a blower; The MBR membrane tank aeration component is connected to the MBR membrane tank, the ozone aeration component is connected to the fourth variable tank, and the blower is connected to the second and third variable tanks. The controller switches processing modes according to the adjustment unit, controlling the aeration components to selectively aerate the reaction unit.

[0009] In a further embodiment of the present invention, the detection unit includes a first total nitrogen monitor, a redox potential monitor, a first dissolved oxygen meter, a second total nitrogen monitor, a second dissolved oxygen meter, a third total nitrogen monitor, and a third dissolved oxygen meter; The first total nitrogen monitor is installed in the hydrolysis tank; the redox potential monitor, the first dissolved oxygen meter, and the second total nitrogen monitor are installed in the first variable tank; the second dissolved oxygen meter and the third total nitrogen monitor are installed in the second variable tank; and the third dissolved oxygen meter is installed in the third variable tank. The controller controls the adjustment unit to switch processing modes based on the changes in dissolved oxygen and redox potential values ​​in each variable pool.

[0010] In a further embodiment of the present invention, each of the hydrolysis tank, the first variable tank, the second variable tank, and the third variable tank is equipped with a stirring unit, and the controller controls the stirring unit to stir the corresponding variable tank.

[0011] A further aspect of the present invention, The first pipeline includes a clean water return pump and a first valve, with the first valve and the clean water return pump connected in series between the hydrolysis tank and the fourth variable tank; The second pipeline includes a sludge return pump and a second valve, which are connected in series between the hydrolysis tank and the MBR membrane tank. The third pipeline includes a first nitration return pump and a third valve, which are connected in series between the first variable tank and the second variable tank. The fourth pipeline includes a sixth valve and a sludge pump, which are connected in series between the second and third variable tanks. The fifth pipeline includes a fourth valve, a seventh valve, and a second nitrification liquid return pump. The fourth valve and the seventh valve are connected in parallel to the second nitrification liquid return pump. The fourth valve and the seventh valve are connected one-to-one with the second variable tank and the third variable tank. The second nitrification liquid return pump is connected to the MBR membrane tank. When the adjustment unit switches the processing mode, the controller controls the return of clean water, sludge and nitrification liquid in the corresponding variable tank.

[0012] In a further embodiment of the present invention, the controller controls the reflux rate of the substance in each pipeline by comparing the parameter value with the preset value, thereby switching the system working mode; the reflux rate of the substance is directly proportional to the reflux ratio of the substance, and the reflux ratio is calculated by the following formula; r =( T 进 - T 出 ) / T出 in, r For reflux ratio, T 进 This refers to the inflow rate of the influent material in the unit. T 出 This represents the amount of material flowing out of the unit's effluent.

[0013] In a further embodiment of the present invention, the controller controls the feeding device to selectively feed the reaction unit; the controller controls the return flow of nitrification liquid, sludge and clean water in the pipeline assembly; the controller controls the aeration component to selectively aerate the corresponding variable tank, thereby realizing the switching of the processing mode of the adjustment unit.

[0014] Secondly, the present invention discloses a treatment method based on the above-mentioned landfill leachate treatment system, which includes the following steps: The parameters include a first parameter and a second parameter; the upper and lower values ​​of the first parameter are set, and the critical value of the second parameter is set; When the detection unit detects that the value of the first parameter in the first variable cell is not greater than the lower value, it closes the third pipeline, closes the fifth pipeline, and opens the fourth pipeline. When the detection unit detects that the value of the first parameter in the second variable cell is not greater than the lower value, and the value of the second parameter in the first variable cell is lower than the critical value, it opens the branch in the fifth pipeline that connects to the third variable cell. When the detection unit detects that the value of the second parameter in the first variable cell is not lower than the critical value and the value of the first parameter in the third variable cell is greater than the upper value, it closes the fourth pipeline; opens the branch of the fifth pipeline that connects to the second variable cell, closes the other branch of the fifth pipeline; and opens the first pipeline and the second pipeline.

[0015] Thirdly, this application also discloses a non-transitory readable storage medium storing instructions that, when executed by a controller, cause the controller to perform the aforementioned processing method. The beneficial effects of this invention are as follows: This invention incorporates multiple variable tanks and detection units. During operation, the controller adjusts the units based on the content of material components detected by the detection units in the reaction units (e.g., selectively feeding the feeding equipment, and simultaneously opening or closing various pipelines to achieve the reflux of relevant substances), thus enabling the switching of treatment modes to adapt to different concentrations of wastewater. This equipment can use different treatment processes for wastewater of different concentrations, adjusting the treatment process as needed, thereby effectively reducing operating and modification costs. In practical applications, it avoids unnecessary project shutdowns and, to a certain extent, reduces the professional requirements for operators. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a landfill leachate treatment system in an embodiment of the present invention.

[0017] Figure 2 This is a flowchart of a landfill leachate treatment method in an embodiment of the present invention.

[0018] in: 101. Reaction Unit; 102. Adjustment Unit; 102.1. Feeding Equipment; 102.2. Piping Assembly; 102.3. Aeration Components; 103. Detection Unit; 1.1, Stirring unit; 10. Hydrolysis tank; 20. First variable tank; 30. Second variable tank; 40. Third variable tank; 50. MBR membrane tank; 60. Fourth variable tank; 100. First pipeline; 200. Second pipeline; 300. Third pipeline; 400. Fourth pipeline; 500. Fifth pipeline; 2.1 First valve; 2.2 Second valve; 2.3 Third valve; 2.4 Fourth valve; 2.5 Fifth valve; 2.6 Sixth valve; 2.7 Seventh valve; 2.8 Eighth valve; 3.1 First nitrification liquor return pump; 3.2 Sludge pump; 3.3 Second nitrification liquor return pump; 3.4 Sludge return pump; 3.5 Clear water return pump; 3.6 Blower; 3.7 MBR membrane tank aeration components; 3.8 Ozone aeration components; 3.9 MBR membrane tank permeate pump; 4.1 First total nitrogen monitor; 4.2 Oxidation-reduction potential monitor; 4.3 First dissolved oxygen meter; 4.4 Second total nitrogen monitor; 4.5 Second dissolved oxygen meter; 4.6 Third total nitrogen monitor; 4.7 Third dissolved oxygen meter; 5.1 External heating system; 5.2 Methanogenic bacteria agent dosing unit; 5.3 First denitrifying bacteria agent dosing unit; 5.4 Aerobic microbial agent dosing unit; 5.5 Second denitrifying bacteria agent dosing unit; 6. Sealing cover. Detailed Implementation

[0019] 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, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use.

[0020] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0021] like Figure 1As shown, this embodiment discloses a landfill leachate treatment system, which includes a reaction unit, an adjustment unit, and a detection unit. The reaction unit includes a hydrolysis tank 10, a first variable tank 20, a second variable tank 30, a third variable tank 40, an MBR membrane tank 50, and a fourth variable tank 60 connected in sequence. Under normal circumstances, the outlets, sludge outlets, inlets, and sludge inlets at the bottom of each tank, such as the hydrolysis tank 10, the first variable tank 20, the second variable tank 30, and the third variable tank 40, as well as the water passage holes on the side walls, are all equipped with filter screens to effectively intercept the MBBR packing (moving bed biofilm packing). The adjustment unit includes feeding equipment, pipeline components, and aeration components for adjusting the parameters in the reaction unit. The piping assembly includes a first pipe 100, a second pipe 200, a third pipe 300, a fourth pipe 400, and a fifth pipe 500. The first pipe 100 connects the hydrolysis tank 10 and the fourth variable tank 60 (clear water tank) for clear water return to the hydrolysis tank 10. The second pipe 200 connects the hydrolysis tank 10 and the MBR membrane tank 50 for sludge return to the hydrolysis tank 10. The third pipe 300 connects the first variable tank 20 and the second variable tank 30 for nitrification liquor return to the first variable tank 20. The fourth pipe 400 connects the second variable tank 30 and the third variable tank 40 for sludge return to the third variable tank 40. The fifth pipe 500 connects the second variable tank 30, the third variable tank 40, and the MBR membrane tank 50 for selective nitrification liquor return to either the second variable tank 30 or the third variable tank 40. A detection unit is installed inside the reaction unit for detecting parameters within the reaction unit.

[0022] During operation, based on the detection unit's identification of the concentration of substances in the corresponding tank, the feeding equipment adds microbial agents to the corresponding tank, and the aeration components aerate the corresponding tank. Simultaneously, the selective opening and closing of various pipelines allows for the return of nitrified liquid, sludge, and clean water. By selecting pipelines and selectively adding microbial agents through the feeding equipment, and by making reasonable changes in the process, different operating modes can be switched to handle leachate of varying concentrations, thus improving the system's treatment performance. In practical applications, this system can also be equipped with a central control unit (controller), which is electrically connected to the adjustment unit and the detection unit. The detection unit analyzes data and sends it to the central control unit, which then issues different operating commands to intelligently complete the switching between different modes.

[0023] Observe again Figure 1 The design and production of the landfill leachate treatment system are described in detail. In this embodiment, the feeding equipment includes a methanogenic bacteria agent dosing unit 5.2, a first denitrifying bacteria agent dosing unit 5.3, an aerobic microbial agent dosing unit 5.4, and a second denitrifying bacteria agent dosing unit 5.5. The methanogenic bacteria agent dosing unit 5.2 is connected to the first variable tank 20, the first denitrifying bacteria agent dosing unit 5.3 is connected to the second variable tank 30, and the aerobic microbial agent dosing unit 5.4 and the second denitrifying bacteria agent dosing unit 5.5 are connected to the third variable tank 40. This embodiment uses methanogenic bacteria, denitrifying bacteria, and aerobic microbial agents; the design and use can be modified as needed. Replace with a microbial agent that has the same effect; methanogenic agents enable the anaerobic digestion process to proceed smoothly, while denitrifying agents are mainly used to improve the denitrification capacity of wastewater treatment systems and are usually used in anoxic areas such as anoxic ponds; aerobic microbial agents oxidize some of the absorbed organic matter into simple inorganic matter; the landfill leachate treatment system is also equipped with an external heating system 5.1, which is connected to the first variable tank 20 and used to heat the first variable tank 20. When in use, the methanogenic agent dosing unit 5.2 at the first variable tank 20 is turned on, and the liquid in the tank is heated to create mesophilic reaction conditions.

[0024] In this embodiment, the aeration components include an MBR membrane tank aeration assembly 3.7, an ozone aeration assembly 3.8, and a blower 3.6. The MBR membrane tank aeration assembly 3.7 is connected to the MBR membrane tank 50, the ozone aeration assembly 3.8 is connected to the fourth variable tank 60, and the blower 3.6 is connected to the second variable tank 30 and the third variable tank 40. Each of the hydrolysis tank 10, the first variable tank 20, the second variable tank 30, and the third variable tank 40 is equipped with a liftable stirring unit 1.1. The stirring unit 1.1 uses a submersible stirrer. The power of the submersible stirrer in each tank is set according to the requirements. A lifting device is installed on the side wall of the corresponding variable tank. The lifting device is used to switch the up and down position of the liftable submersible stirrer to ensure that the liquid in the tank is stirred evenly. The lifting structure is a mature existing technology and can be implemented using a lead screw, cylinder, and slide rail, etc., which will not be described in detail here.

[0025] In this embodiment, the detection unit includes a first total nitrogen monitor 4.1, a redox potential monitor 4.2, a first dissolved oxygen meter 4.3, a second total nitrogen monitor 4.4, a second dissolved oxygen meter 4.5, a third total nitrogen monitor 4.6, and a third dissolved oxygen meter 4.7. Based on the total nitrogen monitoring results of each pool and the treatment requirements, the reflux ratio of each nitrification liquid is automatically adjusted to achieve effective removal of total nitrogen from the leachate of the transfer station at different times. The first total nitrogen monitor 4.1 is installed in the hydrolysis tank 10, the redox potential monitor 4.2, the first dissolved oxygen meter 4.3, and the second total nitrogen monitor 4.4 are installed in the first variable tank 20, the second dissolved oxygen meter 4.5 and the third total nitrogen monitor 4.6 are installed in the second variable tank 30, and the third dissolved oxygen meter 4.7 is installed in the third variable tank 40.

[0026] In this embodiment, each pipeline is assembled using pump bodies, valves, and pipes. In some embodiments, the first pipeline 100 includes a clean water return pump 3.5 and a first valve 2.1, with the first valve 2.1 and the clean water return pump 3.5 connected in series between the hydrolysis tank 10 and the fourth variable tank 60; the second pipeline 200 includes a sludge return pump 3.4 and a second valve 2.2, with the sludge return pump 3.4 and the second valve 2.2 connected in series between the hydrolysis tank 10 and the MBR membrane tank 50; the third pipeline 300 includes a first nitrification liquor return pump 3.1 and a third valve 2.3, with the first nitrification liquor return pump 3.1 and the third valve 2.3 connected in series between the first variable tank 20 and the second variable tank 30; the fourth pipeline 400 includes... The system includes a sixth valve 2.6 and a sludge pump 3.2, which are connected in series between the second variable tank 30 and the third variable tank 40. The fifth pipeline 500 includes a fourth valve 2.4, a seventh valve 2.7, and a second nitrification liquid return pump 3.3. The fourth valve 2.4 and the seventh valve 2.7 are connected in parallel to the second nitrification liquid return pump 3.3, and the fourth valve 2.4 and the seventh valve 2.7 are connected one-to-one with the second variable tank 30 and the third variable tank 40. The second nitrification liquid return pump 3.3 is connected between the MBR membrane tanks 50. An MBR membrane tank permeate pump 3.9 is installed between the MBR membrane tank 50 and the fourth variable tank 60 to circulate wastewater and create sufficient membrane flux.

[0027] As attached Figure 2 As shown, in another embodiment, a treatment method for a landfill leachate treatment system is disclosed, which includes the following steps; The pretreated wastewater flows into the first variable tank 20. The pretreatment process here includes water quality and quantity adjustment, coagulation and sedimentation, and leachate treatment such as air flotation. This is a conventional pretreatment process, so it is briefly described here. In this embodiment, the parameters include a first parameter and a second parameter; the upper and lower values ​​of the first parameter are set, and the critical value of the second parameter is set; In the first mode: when the detection unit detects that the value of the first parameter in the first variable pool 20 is not greater than the lower value, it closes the third pipeline 300, closes the fifth pipeline 500, and opens the fourth pipeline 400. In the second mode: when the detection unit detects that the value of the first parameter in the second variable pool 30 is not greater than the lower value, and the value of the second parameter in the first variable pool 20 is lower than the critical value, then the branch in the fifth pipeline 500 connected to the third variable pool 40 is opened. When the detection unit detects that the value of the second parameter in the first variable tank 20 is not lower than the critical value, and the value of the first parameter in the third variable tank 40 is greater than the upper limit value, it closes the fourth pipeline 400; opens the branch of the fifth pipeline 500 connecting to the second variable tank 30, and closes the other branch of the fifth pipeline 500; and opens the first pipeline 100 and the second pipeline 200. It is worth mentioning here the adaptive use of the methanogenic bacteria dosing unit 5.2, the first denitrifying bacteria dosing unit 5.3, the aerobic microbial bacteria dosing unit 5.4, and the second denitrifying bacteria dosing unit 5.5.

[0028] The processing method will be explained in detail below with reference to practical applications; The first parameter is dissolved oxygen; the upper limit is 1.5 mg / L; the lower limit is 0.2 mg / L; the second parameter is the redox potential; the critical value is -150 mV.

[0029] In the initial phase: When the system is first put into use, and the transfer station is initially operational, the leachate volume is insufficient. Considering cost factors, the initial cultivation and debugging of the microbial strain will use a combination of clean water, activated sludge, and an additional carbon source. Later, landfill leachate will be gradually introduced for microbial acclimatization. The overall influent water quality will be diluted to some extent. This phase lasts for several months to a year. During this phase, keep the sealing cover 6 open, and turn on the hydrolysis tank 10, the first variable tank 20, the third variable tank 40, and their corresponding agitators. Keep the eighth valve 2.8 of the aeration pipe in the third variable tank 40 closed. Turn on the fifth valve 2.5 and the blower 3.6 of the aeration pipe in the second variable tank 30. Turn on the MBR membrane tank aeration assembly 3.7. Keep the sludge pump 3.2 from the bottom sludge outlet of the second variable tank 30 to the bottom sludge inlet of the third variable tank 40 and its corresponding sixth valve 2.6 closed. Turn on the outlet from the bottom of the second variable tank 30 to the first variable tank... The first nitrification liquor return pump 3.1 at the bottom inlet of MBR membrane tank 50 and its corresponding pipeline third valve 2.3 are turned on; the second nitrification liquor return pump 3.3 from the bottom outlet of MBR membrane tank 50 to the bottom inlet of the third variable tank 40 and its corresponding pipeline seventh valve 2.7 are turned on; the fourth valve 2.4 at the bottom inlet of the second variable tank 30 is kept closed, and the nitrification liquor return ratio from the second variable tank 30 to the first variable tank 20 is automatically calculated based on the result of the first total nitrogen monitor 4.1, and the closest return ratio between 2 and 10 is selected for nitrification liquor return. At the same time, the nitrification liquor return ratio from MBR membrane tank 50 to the third variable tank 40 is automatically calculated based on the result of the second total nitrogen monitor 4.4, and the closest return ratio between 2 and 10 is selected for nitrification liquor return. The sludge return pump 3.4 from the sludge outlet of MBR membrane tank 50 to the sludge inlet of hydrolysis tank 10 and its corresponding second valve 2.2 are turned on, with a return ratio of 1. It is worth mentioning here that the formula for the nitrification liquor return ratio is as follows. r = ( T 进 -T 出 ) / T 出 in, r This is the nitration liquor reflux ratio. T 进 The total nitrogen content of the influent to the unit. T 出 This refers to the total nitrogen content in the unit effluent. The calculated result is usually not an integer. The result is rounded to the nearest integer between 2 and 10. If the result is greater than 10, it is rounded to 10. If it is less than 2, it is rounded to 2. The intermediate values ​​are rounded up or down. The following is a brief description of the reflux ratio.

[0030] During the nitrification liquid recirculation, keep the MBR membrane tank permeate pump 3.9 running; keep the clear water recirculation pump 3.5 from the bottom outlet of the fourth variable tank 60 to the bottom inlet of the hydrolysis tank 10 and its corresponding pipeline first valve 2.1 closed; keep the ozone aeration component 3.8 closed. Thus, the initial treatment process can be simplified to pretreatment + hydrolysis acidification + anoxic 1 + aerobic + anoxic 2 + MBR membrane tank + clear water tank. This process effectively removes organic pollutants while enhancing the removal of total nitrogen, and at the same time minimizes the concentration of activated sludge in the MBR membrane tank 50, reducing membrane fouling. It is well-suited to the characteristics of low water volume and low pollutant concentration in leachate during the initial operation of a waste transfer station.

[0031] In the first mode: After the transfer station has been operating for a period of time, the pollutant concentration gradually increases and tends to stabilize. At this time, the pollution load on the first variable tank 20 gradually increases, resulting in a decrease in dissolved oxygen in the first variable tank 20, causing the tank to turn black and smelly, forming an anaerobic environment. Through online monitoring by the first dissolved oxygen meter 4.3, when the monitoring result of the first dissolved oxygen meter 4.3 is ≤0.2mg / L, the automatic process adjustment mechanism is triggered, that is, the stirrer in the hydrolysis tank 10 is kept on, the sealing cover 6 is kept open, and the stirring of the first variable tank 20 is kept on. Turn on the equipment; close the first nitrification liquid return pump 3.1 and its corresponding pipeline third valve 2.3 from the bottom outlet of the second variable tank 30 to the bottom inlet of the first variable tank 20; close the fifth valve 2.5 of the aeration pipeline of the second variable tank 30 and simultaneously open the eighth valve 2.8 of the aeration pipeline of the third variable tank 40; keep the blower 3.6 on; keep the MBR membrane tank aeration assembly 3.7 on, and close the second nitrification liquid return pump 3.3 and its corresponding pipeline seventh valve from the bottom outlet of the MBR membrane tank 50 to the bottom inlet of the third variable tank 40. 2.7; Turn off the agitator in the third variable tank 40; turn on the aerobic microbial agent automatic dosing system 5.4, and simultaneously, after the second variable tank 30 has been fully settled, turn on the sludge pump 3.2 and its corresponding sixth valve 2.6; after the original aerobic activated sludge in the second variable tank 30 has been transported to the third variable tank 40, turn it off, then turn on the agitator in the second variable tank 30; turn on the first denitrifying agent dosing unit 5.3; turn on the second nitrification liquid return pump 3.3 and its corresponding fourth valve 2.4, and according to the first variable tank 2... The online monitoring of total nitrogen in 024.4 automatically calculates the optimal nitrification liquor recirculation ratio. The ratio is between 2 and 10. The closest recirculation ratio is selected for nitrification liquor recirculation. Then, keep the sludge recirculation pump 3.4 from the MBR membrane tank 50 to the hydrolysis tank 10 and its corresponding second valve 2.2 running, and reduce the recirculation ratio to 0.5. Keep the MBR membrane tank permeate pump 3.9 running, and open the clear water recirculation pump 3.5 from the bottom outlet of the fourth variable tank 60 to the bottom inlet of the hydrolysis tank 10 and its corresponding first valve 2.1, with a clear water recirculation ratio of 0.5. At this point, the process has been automatically adjusted and simplified to pretreatment + hydrolysis acidification 1 + hydrolysis acidification 2 + anoxic 1 + aerobic 1 + MBR + clear water tank (fourth variable tank 60). At this time, the pollutant concentration in the leachate of the transfer station is relatively high. This process strengthens the treatment of recalcitrant organic pollutants by hydrolysis acidification, increases the activated sludge concentration in the MBR membrane tank 50, and at the same time, the return flow from the clear water tank effectively dilutes the influent, effectively ensuring the stable operation of the biological system.

[0032] In the second mode: When the dry season arrives, the leachate volume at the transfer station decreases, and the concentration of pollutants in the water further increases. The pollution load in the first variable tank 20 further increases, and the oxidation-reduction potential further decreases. Due to the impact of shock, the dissolved oxygen (DO) in the second variable tank 30 further decreases, and the denitrification function gradually weakens. When the dissolved oxygen meter 4.5 monitoring result is ≤0.2mg / L and the oxidation-reduction potential (ORP) monitor 4.2 detection value is below -150mV, the automatic process adjustment mechanism is triggered, that is, to maintain the stirring in the hydrolysis tank 10. Open and close the sealing cover 6 of the first variable tank 20, open the external heating system 5.1 of the first variable tank 20, open the methanogenic agent dosing unit 5.2 of the first variable tank 20 to create medium-temperature reaction conditions, keep the stirrer in the first variable tank 20 on to create conditions for the growth of methanogenic bacteria, and achieve preliminary removal of some pollutants. At the same time, keep the stirrer in the second variable tank 30 on, keep the fifth valve 2.5 of the aeration pipe of the second variable tank 30 closed, open the seventh valve 2.7 of the bottom inlet of the third variable tank 40, and close the second variable tank 3. The fourth valve 2.4 at the bottom inlet of tank 0 is turned on, the second nitrification liquid return pump 3.3 is kept open, the sludge pump 3.2 from the bottom sludge outlet of the second variable tank 30 to the bottom sludge inlet of the third variable tank 40 and its corresponding sixth valve 2.6 are kept closed, the aeration components 3.7 are kept open, the eighth valve 2.8 of the aeration pipeline of the third variable tank 40 and the blower 3.6 are closed, the agitator in the third variable tank 40 is turned on, the second denitrifying bacteria agent dosing unit 5.5 is turned on, and the optimal nitrification liquid is automatically calculated based on the results of the online total nitrogen monitor of the second variable tank 30. For the reflux ratio, select the closest reflux ratio between 2 and 10 for nitrification liquor reflux. Keep the MBR membrane tank permeate pump 3.9 on and keep the sludge reflux pump 3.4 and its corresponding second valve 2.2 running from the bottom sludge outlet of the MBR membrane tank 50 to the bottom sludge inlet of the hydrolysis tank 10. Reduce the reflux ratio to 0.2. Open the ozone aeration component 3.8 in the fourth variable tank 60. Keep the clean water reflux pump 3.5 and its corresponding first valve 2.1 running from the bottom outlet of the fourth variable tank 60 to the bottom inlet of the hydrolysis tank 10. Set the reflux ratio to 1. At this point, the process has been automatically adjusted to pretreatment + hydrolysis acidification 1 + methanogenesis + hydrolysis acidification 2 + anoxic treatment 1 + MBR + ozone advanced oxidation. This process is better suited to the characteristics of higher pollutant concentration and smaller water volume in leachate during the dry season at the transfer station. The addition of a methanogenesis unit removes one portion of pollutants before further enhancing hydrolysis for those that are difficult to degrade, reducing the pollution load of subsequent biological units. It also reduces the sludge return ratio from the MBR membrane tank to the hydrolysis tank 10 to 0.2, significantly reducing sludge return from the MBR membrane tank 50, increasing the aerobic bacteria concentration in the MBR membrane tank 50, enhancing the aerobic degradation capacity of the MBR membrane tank 50, and simultaneously strengthening the clear water return from the fourth variable tank 60 to the hydrolysis tank 10 while activating the ozone advanced oxidation system in the fourth variable tank 60, ensuring that the produced water meets the standards.

[0033] When the rainy season arrives, the quality and quantity of leachate from the transfer station improve. As the influent pollution load decreases and the influent volume increases, the methanogenic environment in the first variable tank 20 is gradually disrupted, and the dissolved oxygen in the second variable tank 30 and the third variable tank 40 gradually rises. When the redox potential monitor 4.2 detects a value ≥ -150mV and the dissolved oxygen meter 4.7 detects a value > 1.5mg / L, the automatic process adjustment mechanism is triggered. This involves keeping the agitator in the hydrolysis tank 10 running and shutting down the external heating system 5.1; opening the sealing cover 6 of the first variable tank 20 and keeping the agitator in the first variable tank 20 running; keeping the agitator in the second variable tank 30 running; keeping the fifth valve 2.5 of the aeration pipe in the second variable tank 30 closed; keeping the sludge pump 3.2 and its corresponding sixth valve 2.6 closed; opening the first denitrifying agent dosing unit 5.3; keeping the second nitrification liquid return pump in the MBR membrane tank running 3.3; and opening the MBR membrane tank 50 to the second... Activate valve 2.4 of the nitrification liquor return pipeline in variable tank 30; close valve 2.7 of the nitrification liquor return pipeline from MBR membrane tank 50 to the third variable tank 40; automatically calculate the optimal nitrification liquor return ratio based on the online monitoring results of total nitrogen in the first variable tank 20 (4.4), and select the closest return ratio between 2 and 10 for nitrification liquor return; shut off the agitator in the third variable tank 40; open valve 2.8 and blower 3.6 of the aeration pipeline in the third variable tank 40; open the... The automatic aerobic bacteria dosing system 5.4 in the three variable tank 40 is activated, and the MBR membrane tank permeate pump 3.9 is kept running. The sludge return pump 3.4 from the MBR membrane tank 50 to the hydrolysis tank 10 and its corresponding second valve 2.2 are also kept running. The return ratio is adjusted to 0.5. The ozone aeration component 3.8 in the fourth variable tank 60 is shut down, and the clear water return pump 3.5 from the fourth variable tank 60 to the hydrolysis tank 10 and its corresponding first valve 2.1 are kept running, with the return ratio set to 0.5. At this point, the process automatically reverts to the first mode's process route: pretreatment + hydrolysis acidification 1 + hydrolysis acidification 2 + anoxic 1 + aerobic 1 + MBR + clear water tank. This process route better addresses the water quality characteristics and changes during normal operation of the transfer station in the non-dry season. Compared to the second mode's process route, this process better saves operating costs and effectively reduces MBR membrane fouling.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A treatment method for landfill leachate treatment system, characterized in that, The landfill leachate treatment system includes: The reaction unit includes a hydrolysis tank, a first variable tank, a second variable tank, a third variable tank, an MBR membrane tank, and a fourth variable tank connected in sequence. An adjustment unit is configured to adjust parameters in the reaction unit and includes a feeding device and a piping assembly as well as an aeration component connected to the reaction unit. The piping assembly includes a first pipe, a second pipe, a third pipe, a fourth pipe, and a fifth pipe; wherein, The first pipeline connects the hydrolysis tank and the fourth variable tank, and is configured to guide clean water back to the hydrolysis tank; The second pipeline connects the hydrolysis tank and the MBR membrane tank, and is configured to guide sludge back to the hydrolysis tank; The third pipeline connects the first variable tank and the second variable tank, and is configured to guide the nitrified liquid back to the first variable tank; The fourth pipeline connects the second variable tank and the third variable tank, and is configured to guide sludge back to the third variable tank; The fifth pipeline connects the second variable tank, the third variable tank, and the MBR membrane tank, and is configured to guide the nitrification liquid to selectively return to the second variable tank or the third variable tank. A detection unit, wherein the detection unit is installed within the reaction unit and configured to detect parameters in the reaction unit; and A controller electrically connected to the adjustment unit and the detection unit is configured to control the adjustment unit to switch processing modes based on a comparison between the parameter values ​​detected by the detection unit and preset values. The parameters include a first parameter and a second parameter; the first parameter is dissolved oxygen, and the second parameter is the redox potential value; the upper and lower values ​​of the first parameter are set, and the critical value of the second parameter is set; The processing method includes identifying the concentration of material parameters in the corresponding pool based on the detection unit, adding microbial agents to the corresponding pool using a feeding device, and aerating the corresponding pool using an aeration component to change the dissolved oxygen environment of the corresponding pool. When the detection unit detects that the value of the first parameter in the first variable tank is not greater than the lower value, the controller closes the third pipeline, closes the fifth pipeline, and opens the fourth pipeline; the hydrolysis tank is used as the hydrolysis acidification tank, the first variable tank as the hydrolysis acidification tank, the second variable tank as the anoxic tank, the third variable tank as the aerobic tank, and the fourth variable tank as the clear water tank. When the detection unit detects that the value of the first parameter in the second variable tank is not greater than the lower value, and the value of the second parameter in the first variable tank is lower than the critical value, the controller opens the branch in the fifth pipeline that connects to the third variable tank; the hydrolysis tank is used as a hydrolysis acidification tank, the first variable tank as a methanogenic tank, the second variable tank as a hydrolysis acidification tank, the third variable tank as an anoxic tank, and the fourth variable tank as an ozone advanced oxidation tank; When the detection unit detects that the value of the second parameter in the first variable tank is not lower than the critical value, and the value of the first parameter in the third variable tank is greater than the upper limit value, the controller closes the fourth pipeline; opens the branch of the fifth pipeline that connects to the second variable tank, and closes the other branch of the fifth pipeline; opens the first pipeline and the second pipeline; and uses the hydrolysis tank as the hydrolysis acidification tank, the first variable tank as the hydrolysis acidification tank, the second variable tank as the anoxic tank, the third variable tank as the aerobic tank, and the fourth variable tank as the clear water tank.

2. The treatment method of the landfill leachate treatment system according to claim 1, characterized in that, The feeding equipment includes a methanogenic bacteria agent feeding unit, a first denitrifying bacteria agent feeding unit, an aerobic microbial agent feeding unit, and a second denitrifying bacteria agent feeding unit; The methanogenic bacteria dosing unit is connected to the first variable tank, the first denitrifying bacteria dosing unit is connected to the second variable tank, and the aerobic microbial bacteria dosing unit and the second denitrifying bacteria dosing unit are connected to the third variable tank. The controller switches the processing mode according to the adjustment unit and controls the feeding equipment to selectively add microbial bacteria to the reaction unit.

3. The treatment method of the landfill leachate treatment system according to claim 1, characterized in that, The aeration components include an MBR membrane tank aeration assembly, an ozone aeration assembly, and a blower; The MBR membrane tank aeration component is connected to the MBR membrane tank, the ozone aeration component is connected to the fourth variable tank, and the blower is connected to the second and third variable tanks. The controller switches processing modes according to the adjustment unit, controlling the aeration components to selectively aerate the reaction unit.

4. The treatment method of the landfill leachate treatment system according to claim 1, characterized in that, The detection unit includes a first total nitrogen monitor, a redox potential monitor, a first dissolved oxygen meter, a second total nitrogen monitor, a second dissolved oxygen meter, a third total nitrogen monitor, and a third dissolved oxygen meter; The first total nitrogen monitor is installed in the hydrolysis tank; the redox potential monitor, the first dissolved oxygen meter, and the second total nitrogen monitor are installed in the first variable tank; the second dissolved oxygen meter and the third total nitrogen monitor are installed in the second variable tank; and the third dissolved oxygen meter is installed in the third variable tank. The controller controls the adjustment unit to switch processing modes based on the changes in dissolved oxygen and redox potential values ​​in each variable pool.

5. The treatment method of the landfill leachate treatment system according to claim 1, characterized in that, Each of the hydrolysis tank, the first variable tank, the second variable tank, and the third variable tank is equipped with a stirring unit, and the controller controls the stirring unit to stir the corresponding variable tank.

6. The treatment method of the landfill leachate treatment system according to claim 1, characterized in that, The first pipeline includes a clean water return pump and a first valve, with the first valve and the clean water return pump connected in series between the hydrolysis tank and the fourth variable tank; The second pipeline includes a sludge return pump and a second valve, which are connected in series between the hydrolysis tank and the MBR membrane tank. The third pipeline includes a first nitration return pump and a third valve, which are connected in series between the first variable tank and the second variable tank. The fourth pipeline includes a sixth valve and a sludge pump, which are connected in series between the second and third variable tanks. The fifth pipeline includes a fourth valve, a seventh valve, and a second nitrification liquid return pump. The fourth valve and the seventh valve are connected in parallel to the second nitrification liquid return pump. The fourth valve and the seventh valve are connected one-to-one with the second variable tank and the third variable tank. The second nitrification liquid return pump is connected to the MBR membrane tank. When the adjustment unit switches the processing mode, the controller controls the return of clean water, sludge and nitrification liquid in the corresponding variable tank.

7. The treatment method of the landfill leachate treatment system according to claim 1, characterized in that, The controller controls the reflux rate of the material in each pipeline by comparing the parameter values ​​with preset values, thereby switching the system's operating mode. The reflux rate of the material is directly proportional to the reflux ratio, which is calculated using the following formula. r =（ T 进 - T 出 ） / T 出 in, r For reflux ratio, T 进 This refers to the inflow rate of the influent material in the unit. T 出 This represents the amount of material flowing out of the unit's effluent.

8. The treatment method of the landfill leachate treatment system according to claim 1, characterized in that, The controller controls the feeding equipment to selectively feed the reaction unit; the controller controls the return flow of nitrification liquid, sludge and clean water in the pipeline assembly; the controller controls the aeration component to selectively aerate the corresponding variable tank, thereby realizing the switching of the processing mode of the adjustment unit.

9. A non-transitory readable storage medium, characterized in that, The system stores instructions that, when executed by the controller, cause the controller to perform the processing method as described in claim 1.

Images