Landfill leachate treatment equipment and method

Abstract

The invention relates to the technical field of landfill leachate treatment, in particular to landfill leachate treatment equipment and method.The landfill leachate treatment equipment comprises an anaerobic tank and a water distribution pipe, and the water distribution pipe is arranged at the bottom in the anaerobic tank; the device further comprises a recovery device, an oxidation treatment device, a flocculation treatment device, a filtering device, a flow guide table, a flow guide inclined plate, two groups of circulating boxes and heat exchange pipes, the flow guide table and the flow guide inclined plate are respectively arranged at the upper part in the anaerobic tank, the two groups of circulating boxes are respectively mounted on two sides of the outer side wall of the anaerobic tank, and the plurality of groups of heat exchange pipes penetrate through the anaerobic tank and are communicated with the two groups of circulating boxes; the recovery device is communicated with the anaerobic tank and the two groups of circulating boxes, is used for recovering biogas generated in the anaerobic tank, and is used for heating the reaction temperature in the anaerobic tank by utilizing the biogas; ozone generated by the system can be conveniently combusted and heated, the medium-temperature anaerobic condition is achieved, the better anaerobic treatment effect is achieved, heating energy consumption is reduced, the degradation capacity of microorganisms to pollutants is enhanced, and the overall treatment effect is improved.

Description

Technical Field

[0001] This invention relates to the technical field of landfill leachate treatment, and in particular to a landfill leachate treatment device and method. Background Technology

[0002] Landfill leachate is a liquid formed during the disposal, landfilling, or incineration of waste, resulting from the combined effects of rainwater runoff, surface water soaking, groundwater infiltration, and moisture generated by the decomposition of the waste itself. Landfill leachate contains a large amount of organic matter, including carbohydrates, fats, and proteins, as well as various inorganic substances such as heavy metals (lead, mercury, cadmium, etc.), salts (chlorides, sulfates, etc.), and ammonia nitrogen. The types and concentrations of these substances vary depending on the composition of the waste, the landfill time, and climatic conditions, leading to extremely complex leachate quality. If landfill leachate is discharged directly without proper treatment, it will cause serious pollution to surrounding water bodies, soil, and the atmosphere. High concentrations of organic matter and ammonia nitrogen in leachate can lead to eutrophication of water bodies, disrupting the balance of aquatic ecosystems; heavy metals and toxic substances accumulate in the soil, affecting soil fertility and quality, thus impacting crop growth and food safety; and the foul odors produced by leachate volatilization also pollute the atmosphere, affecting the quality of life of nearby residents. Therefore, effective treatment of landfill leachate is an essential requirement for protecting the environment and maintaining ecological balance.

[0003] Currently, in the treatment of landfill leachate, such as the patent with the existing technology announcement number CN110240357B, the anaerobic treatment process of leachate does not facilitate the recovery of the generated biogas for heating the treatment temperature, thus reducing the efficiency of anaerobic treatment. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a landfill leachate treatment device and method that facilitates the use of ozone generated by the system itself for combustion heating to achieve mesophilic anaerobic conditions, thereby achieving better anaerobic treatment results, reducing heating energy consumption, improving heating sustainability, enhancing the ability of microorganisms to degrade pollutants, and improving the overall treatment effect.

[0005] This invention discloses a landfill leachate treatment device, comprising an anaerobic tank and a distribution pipe, the distribution pipe being disposed at the bottom of the anaerobic tank; it also includes a recovery device, an oxidation treatment device, a flocculation treatment device, a filtration device, a flow guide platform, a flow guide inclined plate, a circulation tank, and heat exchange pipes. The flow guide platform and flow guide inclined plate are respectively disposed in the upper part of the anaerobic tank, two sets of circulation tanks are respectively installed on both sides of the outer wall of the anaerobic tank, multiple sets of heat exchange pipes pass through the anaerobic tank and communicate with the two sets of circulation tanks, and the recovery device is connected to the anaerobic tank and the two sets of circulation tanks. The recovery device is used to recover the biogas generated in the anaerobic tank, and the recovery device utilizes the biogas to... The reaction temperature in the anaerobic tank is heated, and the water distribution pipe is connected sequentially to the oxidation treatment unit and the flocculation treatment unit. The flocculation treatment unit is used to flocculate the landfill leachate, and the oxidation treatment unit is used to degrade the organic matter in the landfill leachate. An overflow outlet is installed at the top of the anaerobic tank, which is connected to a filtration unit. The filtration unit is used to biologically filter the treated leachate and also to return a portion of the concentrated water generated to the anaerobic tank. The original leachate is pumped into a regulating and homogenizing tank for homogenization and water volume adjustment. The regulated leachate is then transported to the flocculation treatment unit, where it is further processed by flocculation. A coagulant is added to the treatment equipment for coagulation and sedimentation, separating the supernatant and sludge. The supernatant is introduced into an oxidation treatment unit, where it undergoes a catalytic reaction with ozone in the presence of a catalyst to degrade recalcitrant organic matter. The effluent after oxidation treatment is sent to a distribution pipe, which distributes the water evenly into the anaerobic tank. The anaerobic tank contains a large number of anaerobic sludge particles. The leachate mixes and contacts the sludge particles, and the microorganisms in the sludge decompose the organic matter in the wastewater, converting it into biogas. As the biogas and leachate rise, they carry small sludge particles to the surface. Finally, the biogas accumulates in the anaerobic tank. At the top, sludge is intercepted by a guide platform and guide ramps, and the intercepted sludge falls back into the anaerobic tank. The treated leachate enters the filtration device for further treatment through the overflow port. Biogas in the anaerobic tank is recovered through a recovery device. The heat transfer liquid in the circulation box and heat exchange tubes is circulated and transported in the recovery device. The recovery device uses the heat from the biogas combustion to heat the heat transfer liquid, which in turn heats the heat exchange tubes, thus heating the wastewater in the anaerobic tank during the reaction process to achieve mesophilic anaerobic conditions. The concentrated water produced by the filtration device is returned to the anaerobic tank for recycling treatment.

[0006] Preferably, the oxidation treatment device includes a conveying device, an oxidation tank, a gas distribution pipe, an ozone generator, a storage tank, a discharge box, a discharge pipe, a disc, and a conveying wheel. The oxidation tank is connected to the gas distribution pipe via a water pump. An exhaust port is located at the top of the oxidation tank. The gas distribution pipe is located at the bottom of the oxidation tank, and the ozone generator is connected to the gas distribution pipe. The storage tank is installed at the top of the oxidation tank. The discharge box is connected to the bottom of the storage tank. The discharge pipe is rotatably connected to the bottom of the discharge box, with its bottom extending into the oxidation tank. Multiple sets of discharge outlets are circumferentially arranged at the bottom of the discharge pipe. A disc is installed at the bottom of the discharge pipe. The conveying wheel is rotatably installed inside the discharge box, and its outer wall has circumferential grooves. The conveying device is connected between the oxidation tank and the flocculation treatment device. The conveying device is used to transport the supernatant from the flocculation treatment device to the oxidation tank, and the conveying device uses water flow power to drive the conveying wheel and the discharge pipe to rotate. The supernatant from the flocculation treatment device is transported to the oxidation tank via the conveying device. During the water flow transport process, the conveying wheel and the discharge pipe are driven to rotate. The storage tank contains catalytic converters. The catalyst flows naturally into the discharge box. After the conveyor wheel rotates, it quantitatively delivers the catalyst falling into the discharge box downwards, allowing the catalyst to be discharged through the outlet of the discharge pipe to the top of the disc. The rotation of the discharge pipe drives the disc to rotate, causing the disc to scatter the catalyst in all directions. When the water flow stops, the addition of catalyst to the oxidation tank stops, achieving the effect of automatic proportional addition of catalyst according to the wastewater flow rate. At the same time, it improves the uniformity of catalyst addition in the oxidation tank. Ozone is delivered to the gas distribution pipe through the ozone generator, and then delivered to the wastewater in the oxidation tank. Through the reaction of ozone and catalyst, the leachate wastewater is efficiently degraded. In addition, in traditional processes, oxidation treatment devices are mostly used for deep treatment after biochemical treatment. In this case, by placing it before anaerobic treatment, its strong oxidation capacity is used to decompose large molecules and recalcitrant organic matter in the leachate into small molecules, significantly improving the B / C ratio of the wastewater and providing more suitable food for subsequent anaerobic microorganisms, thereby greatly improving the treatment efficiency and stability in the anaerobic tank.

[0007] Preferably, the conveying device includes an intercepting filter, a first valve, a cylinder, a rotating shaft, an impeller, and bevel gears. The input end of the intercepting filter is connected to the flocculation treatment device, and the output end of the intercepting filter is equipped with a first valve. The output end of the first valve is connected to the cylinder, and the output end of the cylinder is connected to the oxidation tank. The rotating shaft is rotatably mounted on the cylinder, and the impeller is mounted on the outer wall of the rotating shaft and located inside the cylinder. The front end of the rotating shaft is concentrically connected to the conveying wheel. Two sets of bevel gears are respectively mounted on the outer walls of the rotating shaft and the discharge pipe, and the two sets of bevel gears mesh. After the sewage is discharged from the flocculation treatment device, it passes through the intercepting filter and the first valve and enters the cylinder. The cylinder then conveys the sewage to the oxidation tank. During the sewage flow, the impeller rotates, which in turn rotates the rotating shaft. The rotating shaft then rotates the conveying wheel and the bevel gears. The meshing of the two sets of bevel gears rotates the discharge pipe, improving the effect of water flow drive and reducing the energy consumption of flocculant addition.

[0008] Preferably, the recovery device includes a gas storage chamber, a heating box, a burner, a heating plate, and heat-conducting rods. The gas storage chamber is connected to the top of the anaerobic tank via a first pipeline and a first delivery pump. The burner is located at the bottom of the heating box and is connected to the gas storage chamber. The heating plate is located in the middle of the heating box. Multiple sets of heat-conducting rods are located at the top of the heating plate. Two sets of circulation boxes are connected to the heating box at the top of the heating plate via a second pipeline and a second delivery pump. The biogas generated in the anaerobic tank is transported to the gas storage chamber for storage via the first pipeline and the first delivery pump. The burner uses the biogas combustion to heat the heating plate. The heat-conducting liquid is transported via the second pipeline and the second delivery pump, thereby heating the heat-conducting liquid by the heating plate and the heat-conducting rods.

[0009] Preferably, the flocculation treatment device includes a flocculation tank, an inlet pipe, an inlet pipe, a funnel, and a second valve. The side of the flocculation tank is connected to an interceptor filter. The inlet pipe and the inlet pipe are respectively connected to the outer wall of the flocculation tank. The second valve is connected to the bottom of the flocculation tank. The funnel is located at the bottom of the flocculation tank. The leachate, after adjusting its quality and quantity, is transported to the flocculation tank through the inlet pipe. Flocculant is added through the inlet pipe, causing the leachate to slowly coagulate and settle in the flocculation tank. The supernatant in the flocculation tank is discharged through the interceptor filter. By opening the second valve, the flocculent material is discharged through the bottom of the flocculation tank.

[0010] Preferably, it also includes a motor, an agitator, and a spiral blade. The motor is installed at the top of the flocculation tank, the agitator is rotatably installed inside the flocculation tank, the top of the agitator is connected to the output end of the motor, and the spiral blade is set at the bottom of the agitator. After the motor drives the agitator to rotate, it mixes the leachate with the flocculant, thereby improving the flocculation effect of the leachate. When the flocculants are discharged, the spiral blade rotates to transport the flocculants downwards, avoiding blockage.

[0011] Preferably, the filtration device includes a biological treatment unit, a nanofiltration filter, a concentrate tank, and a return pump. The nanofiltration filter is connected to the biological treatment unit, the concentrate tank is connected to the concentrate output end of the nanofiltration filter, and the return pump is connected between the concentrate tank and the anaerobic tank. The wastewater overflowing from the anaerobic tank enters the biological treatment unit for further purification. The purified wastewater then enters the nanofiltration filter for further filtration, which deeply decolorizes the wastewater and removes small molecule organic matter. Afterward, the nanofiltration filter discharges the qualified water, and the concentrate produced by the nanofiltration filter is transported to the concentrate tank. A portion of the concentrate is then transported to the anaerobic tank via the return pump.

[0012] Preferably, the biological treatment equipment includes an aerobic tank and a filtration module. The aerobic tank is connected between the anaerobic tank and the nanofiltration filter, and the filtration module is located inside the aerobic tank. Wastewater entering the aerobic tank undergoes aerobic biodegradation treatment. The wastewater is then filtered through a membrane separation process by the filtration module. The filtered wastewater then enters the nanofiltration filter, thereby improving the wastewater purification effect.

[0013] Preferably, a method for treating landfill leachate includes the following steps:

[0014] S1. Pump the original leachate into the equalization tank for homogenization and water volume adjustment;

[0015] S2. The adjusted leachate is transported to the flocculation treatment device. By adding coagulant into the flocculation treatment device, coagulation reaction and sedimentation are carried out to separate the supernatant and sludge.

[0016] S3. The supernatant is introduced into the oxidation treatment device and reacts with ozone in the presence of a catalyst to degrade recalcitrant organic matter.

[0017] S4. The effluent after oxidation treatment is sent into the water distribution pipe, which distributes the water evenly in the anaerobic tank. The anaerobic tank contains a large number of anaerobic sludge particles. The leachate mixes and contacts the sludge particles. The microorganisms in the sludge decompose the organic matter in the wastewater and convert it into biogas. As the biogas and leachate rise, they carry small sludge particles to the surface. Finally, the biogas accumulates at the top of the anaerobic tank. The sludge is intercepted by the guide platform and guide inclined plate. The intercepted sludge falls back into the anaerobic tank. The treated leachate enters the filtration device through the overflow port for further treatment.

[0018] S5. The biogas in the anaerobic tank is recovered through the recovery device. The heat transfer liquid in the circulation box and heat exchange tube is circulated and transported in the recovery device. The recovery device uses the heat of biogas combustion to heat the heat transfer liquid. The heat transfer liquid heats the heat exchange tube, which in turn heats the wastewater in the anaerobic tank during the reaction process, thus achieving mesophilic anaerobic conditions.

[0019] S6. Wastewater overflowing from the anaerobic tank enters the aerobic tank for aerobic biodegradation treatment. The wastewater is then filtered through a membrane separation filter module, and the filtered wastewater enters a nanofiltration filter.

[0020] S7. The wastewater enters the nanofiltration filter for filtration, which deeply decolorizes the wastewater and removes small molecule organic matter. After that, the nanofiltration filter discharges the qualified water. The concentrated water produced by the nanofiltration filter is transported to the concentrated water tank. A portion of the concentrated water is then transported to the anaerobic tank through a return pump.

[0021] Preferably, in step S5, the temperature of the mesophilic anaerobic condition is controlled at 35℃-38℃, and the pH value is between 6.8 and 7.5.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: Biogas in the anaerobic tank is recovered through a recovery device. The heat-conducting liquid in the circulation box and heat exchange tubes is circulated within the recovery device. The recovery device uses the heat from biogas combustion to heat the heat-conducting liquid, which in turn heats the heat exchange tubes, thus heating the wastewater in the anaerobic tank during the reaction process. This achieves mesophilic anaerobic conditions. Within this temperature range, methanogenic bacteria and anaerobic microorganisms have high activity, efficiently decomposing organic matter in the leachate to produce methane and carbon dioxide, thereby achieving better anaerobic treatment, reducing heating energy consumption, and improving the sustainability of heating. The concentrated water produced by the filtration device is recycled back to the anaerobic tank for further treatment. This recycling increases the concentration of pollutants in the anaerobic tank. Higher pollutant concentrations stimulate microbial growth and metabolism, enhancing the microorganisms' ability to degrade pollutants, thereby improving the overall treatment effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the isometric structure of the present invention;

[0024] Figure 2 This is an isometric structural diagram of the connection between the anaerobic tank and the water distribution pipes, etc.

[0025] Figure 3 This is a partial isometric structural diagram of the connection between the anaerobic tank and the flow guide platform, etc.

[0026] Figure 4 This is an isometric structural diagram of the connection between the aerobic tank and the filter membrane module, etc.

[0027] Figure 5 This is a partial isometric structural diagram of the connection between the agitator and the spiral blades, etc.

[0028] Figure 6 This is a partial isometric structural diagram of the connection between the discharge pipe and the disk, etc.

[0029] Figure 7 This is a partial isometric structural diagram of the connection between the heating plate and the heat-conducting rod, etc.

[0030] Figure 8 This is a partial isometric structural diagram of the connection between the flocculation tank and the funnel, etc.

[0031] Figure 9 This is a partial isometric structural diagram of the connection between the discharge box and the discharge pipe, etc.

[0032] Figure 10 This is an isometric structural diagram of the connection between the nanofiltration filter and the concentrate tank, etc.

[0033] The attached diagram is labeled as follows: 101, Anaerobic tank; 102, Water distribution pipe; 103, Guide platform; 104, Guide inclined plate; 105, Circulation tank; 106, Heat exchange tube; 201, Oxidation tank; 202, Gas distribution pipe; 203, Ozone generator; 204, Storage tank; 205, Discharge box; 206, Discharge pipe; 207, Disc; 208, Conveyor wheel; 301, Interception filter; 302, First valve; 303, Cylinder; 304, Rotating shaft; 305. Impeller; 306, bevel gear; 401, gas storage chamber; 402, heating box; 403, burner; 404, heating plate; 405, heat-conducting rod; 501, flocculation tank; 502, water inlet pipe; 503, inlet pipe; 504, funnel; 505, second valve; 601, motor; 602, agitator; 603, spiral blade; 701, aerobic tank; 702, filter membrane module; 801, nanofiltration filter; 802, concentrate tank; 803, reflux pump. Detailed Implementation

[0034] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0035] Example 1

[0036] like Figures 1 to 10 As shown, a landfill leachate treatment device of the present invention includes an anaerobic tank 101 and a water distribution pipe 102, the water distribution pipe 102 being disposed at the bottom of the anaerobic tank 101; it also includes a recovery device, an oxidation treatment device, a flocculation treatment device, a filtration device, a flow guide platform 103, a flow guide inclined plate 104, a circulation tank 105, and heat exchange pipes 106. The flow guide platform 103 and the flow guide inclined plate 104 are respectively disposed in the upper part of the anaerobic tank 101, two sets of circulation tanks 105 are respectively installed on both sides of the outer wall of the anaerobic tank 101, and multiple sets of heat exchange pipes 106 pass through the anaerobic tank 101 and communicate with the two sets of circulation tanks 105. The recovery device is connected to the anaerobic tank 101. 01 is connected to two sets of circulation tanks 105. The recovery device is used to recover the biogas generated in the anaerobic tank 101 and uses the biogas to heat the reaction temperature in the anaerobic tank 101. The inlet of the water distribution pipe 102 is connected to the oxidation treatment device and the flocculation treatment device in sequence. The flocculation treatment device is used to flocculate the landfill leachate, and the oxidation treatment device is used to degrade the organic matter in the landfill leachate. An overflow outlet is provided at the top of the anaerobic tank 101. The overflow outlet is connected to the filtration device. The filtration device is used to filter the treated leachate through biological reaction and to return part of the concentrated water generated to the anaerobic tank 101.

[0037] The oxidation treatment device includes a conveying device, an oxidation tank 201, a gas distribution pipe 202, an ozone generator 203, a storage tank 204, a discharge box 205, a discharge pipe 206, a disc 207, and a conveyor wheel 208. The oxidation tank 201 is connected to the gas distribution pipe 202 via a water pump. An exhaust port is provided at the top of the oxidation tank 201. The gas distribution pipe 202 is located at the bottom of the oxidation tank 201. The ozone generator 203 is connected to the gas distribution pipe 202. The storage tank 204 is installed at the top of the oxidation tank 201. The discharge box 205 is connected to the bottom of the storage tank 204. The discharge pipe 206 rotates. The discharge pipe 206 is connected to the bottom of the discharge box 205 and extends into the oxidation tank 201. The bottom of the discharge pipe 206 is provided with multiple sets of discharge outlets around its circumference. The disc 207 is installed at the bottom of the discharge pipe 206. The conveying wheel 208 is rotatably installed inside the discharge box 205. The outer wall of the conveying wheel 208 is provided with grooves around its circumference. The conveying device is connected between the oxidation tank 201 and the flocculation treatment device. The conveying device is used to transport the supernatant in the flocculation treatment device to the oxidation tank 201. The conveying device uses water flow power to drive the conveying wheel 208 and the discharge pipe 206 to rotate.

[0038] In this embodiment, the original leachate is pumped into a homogenizing tank for homogenization and water volume adjustment. The adjusted leachate is then transported to a flocculation treatment device, where a coagulant is added to induce coagulation and sedimentation, separating the supernatant and sludge. The supernatant is then introduced into an oxidation treatment device, where it undergoes a catalytic reaction with ozone in the presence of a catalyst to degrade recalcitrant organic matter. The effluent after oxidation treatment is then sent to a water distribution pipe 102, through which the water is evenly distributed. Inside the anaerobic tank 101, there are a large number of anaerobic sludge particles. The leachate mixes and contacts with the sludge particles. Microorganisms in the sludge decompose the organic matter in the wastewater and convert it into biogas. As the biogas and leachate rise, they carry small sludge particles to the surface. Eventually, the biogas accumulates at the top of the anaerobic tank 101. The sludge is intercepted by the guide platform 103 and the guide inclined plate 104, and the intercepted sludge falls back into the anaerobic tank 101. The treated leachate enters through the overflow port. The next step in the filtration process involves recovering the biogas from the anaerobic tank 101 through a recovery device. The heat-conducting liquid in the circulation box 105 and heat exchange tube 106 is circulated within the recovery device. The recovery device uses the heat from the biogas combustion to heat the heat-conducting liquid, which in turn heats the heat exchange tube 106, thus heating the wastewater in the anaerobic tank 101 and achieving mesophilic anaerobic conditions. Within this temperature range, methanogenic bacteria and anaerobic microorganisms exhibit high activity, efficiently decomposing organic matter in the leachate to produce methane and carbon dioxide, thereby achieving better anaerobic treatment, reducing heating energy consumption, and improving heating sustainability. The concentrated water produced by the filtration device is recycled back to the anaerobic tank 101 for further treatment. This recycled water increases the concentration of pollutants in the anaerobic tank 101. Higher pollutant concentrations stimulate microbial growth and metabolism, enhancing the microorganisms' ability to degrade pollutants and improving the overall treatment effect.

[0039] Example 2

[0040] Based on Example 1, the present invention provides a landfill leachate treatment device, wherein the conveying device includes an intercepting filter 301, a first valve 302, a cylinder 303, a rotating shaft 304, an impeller 305, and bevel gears 306. The input end of the intercepting filter 301 is connected to a flocculation treatment device, and the output end of the intercepting filter 301 is provided with a first valve 302. The output end of the first valve 302 is connected to the cylinder 303, and the output end of the cylinder 303 is connected to an oxidation tank 201. The rotating shaft 304 is rotatably mounted on the cylinder 303. The impeller 305 is mounted on the outer wall of the rotating shaft 304 and disposed inside the cylinder 303. The front end of the rotating shaft 304 is concentrically connected to a conveying wheel 208. Two sets of bevel gears 306 are respectively mounted on the outer walls of the rotating shaft 304 and the discharge pipe 206, and the two sets of bevel gears 306 mesh.

[0041] The recovery device includes a gas storage chamber 401, a heating box 402, a burner 403, a heating plate 404, and heat-conducting rods 405. The gas storage chamber 401 is connected to the top of the anaerobic tank 101 through a first pipeline and a first delivery pump. The burner 403 is located at the bottom of the heating box 402 and is connected to the gas storage chamber 401. The heating plate 404 is located in the middle of the heating box 402. Multiple sets of heat-conducting rods 405 are located at the top of the heating plate 404. Two sets of circulation boxes 105 are connected to the heating box 402 at the top of the heating plate 404 through a second pipeline and a second delivery pump.

[0042] The flocculation treatment device includes a flocculation tank 501, an inlet pipe 502, an inlet pipe 503, a funnel 504, and a second valve 505. The side of the flocculation tank 501 is connected to the intercept filter 301. The inlet pipe 502 and the inlet pipe 503 are respectively connected to the outer wall of the flocculation tank 501. The second valve 505 is connected to the bottom of the flocculation tank 501. The funnel 504 is located at the bottom of the flocculation tank 501.

[0043] It also includes a motor 601, an agitator 602 and a spiral blade 603. The motor 601 is installed at the top of the flocculation tank 501, the agitator 602 is rotatably installed inside the flocculation tank 501, the top of the agitator 602 is connected to the output end of the motor 601, and the spiral blade 603 is located at the bottom of the agitator 602.

[0044] The filtration device includes a biological treatment device, a nanofiltration filter 801, a concentrate tank 802, and a reflux pump 803. The nanofiltration filter 801 is connected to the biological treatment device, the concentrate tank 802 is connected to the concentrate output end of the nanofiltration filter 801, and the reflux pump 803 is connected and installed between the concentrate tank 802 and the anaerobic tank 101.

[0045] The biological treatment equipment includes an aerobic tank 701 and a filter module 702. The aerobic tank 701 is connected between the anaerobic tank 101 and the nanofiltration filter 801, and the filter module 702 is located inside the aerobic tank 701.

[0046] In this embodiment, the supernatant in the flocculation treatment device is transported to the oxidation tank 201 via a conveying device. During the water flow, the conveying wheel 208 and the discharge pipe 206 are driven to rotate. The catalyst stored in the storage tank 204 flows naturally into the discharge box 205. After the conveying wheel 208 rotates, it quantitatively conveys the catalyst falling into the discharge box 205 downwards, so that the catalyst is discharged through the outlet of the discharge pipe 206 to the top of the disc 207. After the discharge pipe 206 rotates, it drives the disc 207 to rotate, causing the disc 207 to scatter the catalyst in all directions. After the flow stops, the addition of catalyst to the oxidation tank 201 ceases, achieving automatic proportional addition of catalyst based on the wastewater flow rate. This also improves the uniform distribution of catalyst within the oxidation tank 201. Ozone is then transported to the gas distribution pipe 202 via the ozone generator 203, which in turn delivers ozone into the wastewater within the oxidation tank 201. Through the reaction of ozone and catalyst, highly efficient degradation of leachate wastewater is achieved. Furthermore, in traditional processes, oxidation treatment devices are often used for advanced treatment after biochemical processes; in this case, the process is implemented by placing the oxidation device in a suitable location... Before anaerobic treatment, its strong oxidizing ability decomposes large molecules and recalcitrant organic matter in the leachate into smaller molecules, significantly increasing the B / C ratio of the wastewater. This provides a more suitable food source for subsequent anaerobic microorganisms, thereby greatly improving the treatment efficiency and stability within the anaerobic tank 101. After being discharged from the flocculation treatment device, the wastewater passes through the interceptor filter 301 and the first valve 302 into the cylinder 303. The cylinder 303 then transports the wastewater to the oxidation tank 201. During the wastewater flow, the impeller 305 rotates, and the rotation of the impeller 305 drives the rotary drum. The shaft 304 rotates, which drives the conveyor wheel 208 and the bevel gear 306 to rotate. The two sets of bevel gears 306 mesh to drive the discharge pipe 206 to rotate, improving the effect of water flow drive and reducing the energy consumption of flocculant addition. The biogas generated in the anaerobic tank 101 is transported to the gas storage chamber 401 for storage through the first pipeline and the first conveying pump. The burner 403 uses biogas combustion to heat the heating plate 404. The heat transfer liquid is transported through the second pipeline and the second conveying pump, so that the heating plate 404 and the heat transfer rod 405 heat the heat transfer liquid.

[0047] Example 3

[0048] A method for treating landfill leachate according to the present invention includes the following steps:

[0049] S1. Pump the original leachate into the equalization tank for homogenization and water volume adjustment;

[0050] S2. The adjusted leachate is transported to the flocculation treatment device. By adding coagulant into the flocculation treatment device, coagulation reaction and sedimentation are carried out to separate the supernatant and sludge.

[0051] S3. The supernatant is introduced into the oxidation treatment device and reacts with ozone in the presence of a catalyst to degrade recalcitrant organic matter.

[0052] S4. The effluent after oxidation treatment is sent into the water distribution pipe 102. The water is evenly distributed in the anaerobic tank 101 through the water distribution pipe 102. There are a large number of anaerobic sludge particles in the anaerobic tank 101. The leachate and sludge particles are mixed and contacted. The microorganisms in the sludge decompose the organic matter in the sewage and convert the organic matter into biogas. During the rise of the biogas and leachate, small sludge particles float to the surface. Finally, the biogas accumulates at the top of the anaerobic tank 101. The sludge is intercepted by the guide platform 103 and the guide inclined plate 104. The intercepted sludge falls back into the anaerobic tank 101. The treated leachate enters the filtration device through the overflow port for further treatment.

[0053] S5. The biogas in the anaerobic tank 101 is recovered by the recovery device. The heat-conducting liquid in the circulation box 105 and the heat exchange tube 106 is circulated and transported in the recovery device. The recovery device uses the heat of biogas combustion to heat the heat-conducting liquid. The heat-conducting liquid heats the heat exchange tube 106, so that the heat exchange tube 106 heats the sewage in the reaction process in the anaerobic tank 101, thereby achieving mesophilic anaerobic conditions.

[0054] S6. Wastewater overflowing from anaerobic tank 101 enters aerobic tank 701 for aerobic biodegradation treatment. The wastewater is then filtered through membrane separation by filter module 702, and the filtered wastewater enters nanofiltration filter 801.

[0055] S7. The wastewater enters the nanofiltration filter 801 for filtration, which deeply decolorizes the wastewater and removes small molecule organic matter. After that, the nanofiltration filter 801 discharges the qualified water. The concentrated water produced by the nanofiltration filter 801 is transported to the concentrated water tank 802. A portion of the concentrated water is then transported to the anaerobic tank 101 by the return pump 803.

[0056] In S5, the temperature of the mesophilic anaerobic conditions is controlled at 35℃-38℃, and the pH value is between 6.8 and 7.5.

[0057] The main functions achieved by this invention are:

[0058] 1. By utilizing the ozone generated by the system itself for combustion heating, mesophilic anaerobic conditions are achieved, resulting in better anaerobic treatment, reduced heating energy consumption, improved heating sustainability, enhanced microbial degradation capacity for pollutants, and improved overall treatment efficiency.

[0059] 2. By placing it before anaerobic treatment, its strong oxidizing ability decomposes the large molecules and recalcitrant organic matter in the leachate into small molecules, significantly improving the B / C ratio of the wastewater, providing more suitable food for subsequent anaerobic microorganisms, thereby greatly improving the treatment efficiency and stability in anaerobic tank 101.

[0060] 3. To achieve the effect of automatic and proportional addition of catalyst according to wastewater flow, while improving the uniformity of catalyst addition in oxidation tank 201 and reducing the energy consumption of automatic flocculant addition.

[0061] The ozone generator 203, intercept filter 301, burner 403, motor 601, filter module 702, nanofiltration filter 801 and reflux pump 803 of the landfill leachate treatment equipment and method of the present invention are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A landfill leachate treatment device, comprising an anaerobic tank (101) and a water distribution pipe (102), the water distribution pipe (102) being disposed at the bottom of the anaerobic tank (101); characterized in that, It also includes a recovery device, an oxidation treatment device, a flocculation treatment device, a filtration device, a flow guide platform (103), a flow guide inclined plate (104), a circulation box (105), and heat exchange tubes (106). The flow guide platform (103) and the flow guide inclined plate (104) are respectively installed in the upper part of the anaerobic tank (101). Two sets of circulation boxes (105) are respectively installed on both sides of the outer wall of the anaerobic tank (101). Multiple sets of heat exchange tubes (106) pass through the anaerobic tank (101) and are connected to the two sets of circulation boxes (105). The recovery device is connected to the anaerobic tank (101) and the two sets of circulation boxes (105). The biogas generated in the anaerobic tank (101) is used to recover the biogas, and the recovery device uses the biogas to heat the reaction temperature in the anaerobic tank (101). The inlet of the water distribution pipe (102) is connected to the oxidation treatment device and the flocculation treatment device in sequence. The flocculation treatment device is used to flocculate the landfill leachate, and the oxidation treatment device is used to degrade the organic matter in the landfill leachate. An overflow port is provided at the top of the anaerobic tank (101), and the overflow port is connected to the filter device. The filter device is used to filter the treated leachate through biological reaction, and the filter device is used to return part of the concentrated water generated to the anaerobic tank (101).

2. The landfill leachate treatment equipment as described in claim 1, characterized in that, The oxidation treatment device includes a conveying device, an oxidation tank (201), a gas distribution pipe (202), an ozone generator (203), a storage tank (204), a discharge box (205), a discharge pipe (206), a disc (207), and a conveyor wheel (208). The oxidation tank (201) is connected to the water distribution pipe (102) via a water pump. An exhaust port is provided at the top of the oxidation tank (201). The gas distribution pipe (202) is located at the bottom of the oxidation tank (201). The ozone generator (203) is connected to the gas distribution pipe (202). The storage tank (204) is installed at the top of the oxidation tank (201). The discharge box (205) is connected to the bottom of the storage tank (204). The discharge pipe... (206) Rotates and connects to the bottom of the discharge box (205). The bottom of the discharge pipe (206) extends into the oxidation tank (201). The bottom of the discharge pipe (206) is provided with multiple sets of discharge outlets in the circumferential direction. The disc (207) is installed at the bottom of the discharge pipe (206). The conveying wheel (208) is rotated and installed inside the discharge box (205). The outer wall of the conveying wheel (208) is provided with grooves in the circumferential direction. The conveying device is connected between the oxidation tank (201) and the flocculation treatment device. The conveying device is used to transport the supernatant in the flocculation treatment device to the oxidation tank (201). The conveying device uses water flow power to drive the conveying wheel (208) and the discharge pipe (206) to rotate.

3. The landfill leachate treatment equipment as described in claim 2, characterized in that, The conveying device includes an intercept filter (301), a first valve (302), a cylinder (303), a rotating shaft (304), an impeller (305), and bevel gears (306). The input end of the intercept filter (301) is connected to the flocculation treatment device. The output end of the intercept filter (301) is provided with a first valve (302). The output end of the first valve (302) is connected to the cylinder (303). The output end of the cylinder (303) is connected to the oxidation tank (201). The rotating shaft (304) is rotatably mounted on the cylinder (303). The impeller (305) is mounted on the outer wall of the rotating shaft (304) and located inside the cylinder (303). The front end of the rotating shaft (304) is concentrically connected to the conveying wheel (208). Two sets of bevel gears (306) are respectively mounted on the outer wall of the rotating shaft (304) and the discharge pipe (206), and the two sets of bevel gears (306) mesh.

4. The landfill leachate treatment equipment as described in claim 1, characterized in that, The recovery device includes a gas storage chamber (401), a heating box (402), a burner (403), a heating plate (404), and heat-conducting rods (405). The gas storage chamber (401) is connected to the top of the anaerobic tank (101) through a first pipeline and a first delivery pump. The burner (403) is located at the bottom of the heating box (402) and is connected to the gas storage chamber (401). The heating plate (404) is located in the middle of the heating box (402). Multiple sets of heat-conducting rods (405) are located at the top of the heating plate (404). Two sets of circulation boxes (105) are connected to the heating box (402) at the top of the heating plate (404) through a second pipeline and a second delivery pump.

5. The landfill leachate treatment equipment as described in claim 1, characterized in that, The flocculation treatment device includes a flocculation tank (501), an inlet pipe (502), an inlet pipe (503), a funnel (504), and a second valve (505). The side of the flocculation tank (501) is connected to the intercept filter (301). The inlet pipe (502) and the inlet pipe (503) are respectively connected to the outer wall of the flocculation tank (501). The second valve (505) is connected to the bottom of the flocculation tank (501). The funnel (504) is located at the bottom of the flocculation tank (501).

6. The landfill leachate treatment equipment as described in claim 5, characterized in that, It also includes a motor (601), an agitator (602) and a spiral blade (603). The motor (601) is installed at the top of the flocculation tank (501), the agitator (602) is rotatably installed inside the flocculation tank (501), the top of the agitator (602) is connected to the output end of the motor (601), and the spiral blade (603) is located at the bottom of the agitator (602).

7. The landfill leachate treatment equipment as described in claim 1, characterized in that, The filtration device includes a biological treatment device, a nanofiltration filter (801), a concentrate tank (802), and a reflux pump (803). The nanofiltration filter (801) is connected to the biological treatment device, the concentrate tank (802) is connected to the concentrate output end of the nanofiltration filter (801), and the reflux pump (803) is connected between the concentrate tank (802) and the anaerobic tank (101).

8. The landfill leachate treatment equipment as described in claim 7, characterized in that, The biological treatment equipment includes an aerobic tank (701) and a filter module (702). The aerobic tank (701) is connected between the anaerobic tank (101) and the nanofiltration filter (801), and the filter module (702) is located inside the aerobic tank (701).

9. A method for treating landfill leachate, characterized in that, Includes the following steps: S1. Pump the original leachate into the equalization tank for homogenization and water volume adjustment; S2. The adjusted leachate is transported to the flocculation treatment device. Coagulant is added to the flocculation treatment device to carry out coagulation reaction and sedimentation, and the supernatant and sludge are separated. S3. The supernatant is introduced into the oxidation treatment device and reacts with ozone in the presence of a catalyst to degrade recalcitrant organic matter. S4. The effluent after oxidation treatment is sent into the water distribution pipe (102). The water is evenly distributed in the anaerobic tank (101) through the water distribution pipe (102). There are a large number of anaerobic sludge particles in the anaerobic tank (101). The leachate and granular sludge are mixed and contacted. The microorganisms in the sludge decompose the organic matter in the sewage and convert the organic matter into biogas. During the rise of the biogas and leachate, small granular sludge particles float to the surface. Finally, the biogas gathers at the top of the anaerobic tank (101). The sludge is intercepted by the guide platform (103) and the guide inclined plate (104). The intercepted sludge falls back into the anaerobic tank (101). The treated leachate enters the filter device through the overflow port for further treatment. S5. The biogas in the anaerobic tank (101) is recovered by the recovery device. The heat-conducting liquid in the circulation box (105) and heat exchange tube (106) is circulated and transported in the recovery device. The recovery device uses the heat of biogas combustion to heat the heat-conducting liquid. The heat-conducting liquid heats the heat exchange tube (106), so that the heat exchange tube (106) heats the sewage in the reaction process in the anaerobic tank (101) to achieve mesophilic anaerobic conditions. S6. Wastewater overflowing from the anaerobic tank (101) enters the aerobic tank (701) for aerobic biodegradation treatment. The wastewater is then filtered through a membrane separation filter module (702), and the filtered wastewater enters the nanofiltration filter (801). S7. The wastewater enters the nanofiltration filter (801) for filtration, which deeply decolorizes the wastewater and removes small molecule organic matter. Then the nanofiltration filter (801) discharges the qualified water. The concentrated water produced by the nanofiltration filter (801) is transported to the concentrated water tank (802). A portion of the concentrated water is transported to the anaerobic tank (101) by the return pump (803).

10. A method for treating landfill leachate as described in claim 9, characterized in that, In S5, the temperature of the mesophilic anaerobic conditions is controlled at 35℃-38℃, and the pH value is between 6.8 and 7.5.

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