A leachate treatment device

Abstract

The utility model provides a kind of landfill leachate treatment device, comprising: the pretreatment component, the materialization treatment component, the biological treatment component and the depth treatment component are sequentially communicated;The leachate to be handled sequentially after the pretreatment component, the materialization treatment component, the biological treatment component and the depth treatment component are handled and discharged;The pretreatment component is used to intercept and separate physical impurities in influent;The materialization treatment component is used to remove heavy metals, phosphates and suspended pollutants in water;The biological treatment component is used to decompose, convert and remove organic pollutants and nutrient pollutants in water;The depth treatment component is used to degrade residual refractory organic matter in water.The utility model is gradually reduced pollutant concentration by pretreatment component, materialization treatment component, biological treatment component and depth treatment component, to realize the effect of high-efficiency removal of pollutants.

Description

Technical Field

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

[0002] Landfill leachate is a mixed liquid produced during landfilling and storage. It contains high concentrations of organic matter (COD 5000-30000 mg / L), ammonia nitrogen (500-2000 mg / L), heavy metals (Pb, Cr, Cu, etc.), and humic acid and other recalcitrant substances. Its water quality fluctuates greatly, and direct discharge results in high toxicity and makes it extremely difficult to treat.

[0003] Existing equipment produces RO concentrate, which cannot achieve full-scale treatment, is prone to secondary pollution, and consumes a lot of energy. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a landfill leachate treatment device that can reduce pollutant concentration step by step and combine resource recovery to achieve efficient removal of pollutants.

[0005] This utility model provides the following technical solution: a landfill leachate treatment device, comprising: a pretreatment component, a physicochemical treatment component, a biological treatment component, and a deep treatment component connected in sequence; the leachate to be treated is discharged after being treated sequentially by the pretreatment component, the physicochemical treatment component, the biological treatment component, and the deep treatment component; The pretreatment component is used to intercept and separate physical impurities in the incoming water; The physicochemical treatment component is used to remove heavy metals, phosphates and suspended pollutants from water; The biological treatment component is used to decompose, transform, and remove organic and nutrient pollutants in water. The deep treatment component is used to degrade residual recalcitrant organic matter in water.

[0006] Furthermore, the pretreatment component includes a bar screen; the bar screen is used to intercept large suspended solids, floating objects and coarse impurities in the water.

[0007] Furthermore, the physicochemical treatment components include: a chemical reaction tank, a coagulation sedimentation tank, a stripping tower, and a return tank connected in sequence; The chemical reaction tank is used to remove pollutants from the water through sedimentation. The coagulation sedimentation tank is used to flocculate fine impurities in water into large flocs and achieve solid-liquid separation through sedimentation. The stripping tower is used to transfer ammonia nitrogen in the water in a free state to the gas phase through gas-liquid mass transfer, thereby achieving separation and removal; The callback pool is used to adjust the pH value of the water to a preset value.

[0008] Furthermore, the biological treatment component includes: an anaerobic reactor and a biochemical tank connected in sequence; The anaerobic reactor is used to degrade organic pollutants in water into biogas; The biological treatment tank is used for the deep removal of nutrient pollutants in the water and for the separation of mud and water. Furthermore, the deep treatment component includes a deep oxidation tank, which is used to deeply oxidize and decompose residual recalcitrant organic matter in the water.

[0009] Furthermore, the deep oxidation tank is equipped with a generator and an electrocatalyst. The generator and the electrocatalyst work together to generate an oxidant, which deeply oxidizes and decomposes the residual recalcitrant organic matter in the water.

[0010] Furthermore, the landfill leachate treatment device also includes a power supply component for supplying power to the generator and the electrocatalyst. The power supply components include: a solar panel, an energy storage device, a bus, and a power grid; the electricity generated by the solar panel is stored in the energy storage device; the energy storage device and the power grid are connected to the bus, and the generator and the electrocatalyst are also connected to the bus.

[0011] Furthermore, the landfill leachate treatment device also includes a sludge discharge pipeline, which includes a main sludge discharge pipe and a third pumping assembly; The coagulation sedimentation tank, the anaerobic reactor, and the biological treatment tank are all connected to the sludge discharge pipeline through the third pumping assembly, and the sludge generated in the coagulation sedimentation tank, the anaerobic reactor, and the biological treatment tank is discharged through the sludge discharge pipeline.

[0012] Furthermore, the chemical reaction tank is equipped with a first stirrer, a first online pH meter, and a first level gauge.

[0013] Furthermore, the coagulation sedimentation tank is equipped with a second agitator and a second online pH meter.

[0014] The beneficial effects of this utility model are: High-efficiency pollutant removal: Through pretreatment, physicochemical treatment, biological treatment, and advanced treatment components, pollutant concentrations are reduced in stages to achieve high-efficiency pollutant removal. Synergistic and efficient: The chemical reaction tank and the stripping tower share alkalinity adjustment, and the pre-positioning of the coagulation sedimentation tank can reduce the risk of clogging in the stripping tower. Moreover, the units are closely connected to achieve synergistic and efficient results. Resource recycling: Anaerobic reactors produce biogas, stripping towers recover ammonium sulfate, and solar panels generate electricity, achieving the effect of "turning waste into treasure".

[0015] Deep compliance: The combination of biological treatment tank and deep oxidation tank overcomes recalcitrant pollutants and ensures that the effluent consistently meets the standards. Attached Figure Description Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the first part of the structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the second part of the structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the mud pipe structure of this utility model.

[0019] Figure 5 This is a flowchart of the present invention.

[0020] The labels in the attached diagram are as follows: 1-Bar screen, 11-Mechanical bar screen, 2-Chemical reaction tank, 21-First agitator, 22-First online pH meter, 23-First level gauge, 3-Coagulation sedimentation tank, 31-Second agitator, 32-Second online pH meter, 4-Stripping tower, 41-First pumping assembly, 42-Tail gas outlet pipe, 43-Air inlet pipe, 44-First connecting pipe, 5-Rebound tank, 51-Third agitator, 52-Third online pH meter, 6-Anaerobic reactor. 61-Second pumping assembly, 62-Second connecting pipe, 7-Biological tank, 71-Membrane separation system, 72-Aeration system, 73-Second level gauge, 8-Deep oxidation tank, 81-Micro-nano bubble generator, 82-Ozone input pipe, 83-Transport pipe, 84-Power supply, 85-Electrocatalyst, 9-Power supply assembly, 91-Bus, 92-Solar power generation panel, 93-Energy storage device, 94-Power grid, 10-Sludge discharge pipeline, 101-Sludge discharge main pipe, 102-Third pumping assembly. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] This embodiment provides a landfill leachate treatment device, such as... Figures 1-5 As shown, it includes: a pretreatment component, a physicochemical treatment component, a biological treatment component, and a deep treatment component connected in sequence; The leachate to be treated is sequentially processed through a pretreatment unit, a physicochemical treatment unit, a biological treatment unit, and an advanced treatment unit before being discharged. The pretreatment component is used to intercept and separate physical impurities in the incoming water. In this embodiment, the pretreatment component includes: a bar screen 1; the bar screen 1 is used to intercept large suspended solids, floating objects and coarse impurities in the water.

[0025] Specifically, such as Figure 2 As shown, a mechanical screen 11 is installed in the screen tank 1. The leachate to be treated first enters the screen tank 1, where the mechanical screen 11 intercepts large suspended solids, floating objects and coarse impurities in the incoming water. It is worth noting that the screen residue needs to be cleaned and disposed of regularly to avoid secondary pollution.

[0026] Physicochemical treatment components are used to remove heavy metals, phosphates and suspended pollutants from water; In this embodiment, as Figure 2 As shown, the physicochemical treatment components include: a chemical reaction tank 2, a coagulation sedimentation tank 3, a stripping tower 4, and a return tank 5 connected in sequence; Chemical reaction tank 2 is used to remove pollutants from water through sedimentation. Specifically, the leachate treated by the screen tank 1 flows into the chemical reaction tank 2. Lime (Ca(OH)2) is added to the chemical reaction tank 2, and the pH value of the water is adjusted to 9-10, thereby reducing the amount of heavy metal ions in the water, such as Pb²⁺. + Cr³ +"Forms insoluble hydroxide precipitates such as Pb(OH)₂ and Cr(OH)₃," followed by precipitate separation, while Ca²⁺ in the lime is also released. + With PO4³ in water - The reaction produces Ca3(PO4)2 precipitate, which can simultaneously remove some phosphates. It is worth noting that the sludge generated in chemical reaction tank 2 is dewatered and treated to avoid pollution. It should be noted that the key parameters for the operation of chemical reaction tank 2 are: pH value of water 9-10, sedimentation time 2-4 hours, and the effluent heavy metal concentration can be reduced to 0.1 mg / L-1 mg / L.

[0027] Furthermore, the chemical reaction tank 2 is equipped with a first stirrer 21, a first online pH meter 22, and a first level gauge 23. When lime is added to the chemical reaction tank 2, the first stirrer 21 can be started to ensure that the lime is fully and evenly mixed with the water. The first online pH meter 22 is used to monitor the pH value of the water in real time, and the first level gauge 23 is used to monitor the level of the liquid in the chemical reaction tank 2.

[0028] Coagulation sedimentation tank 3 is used to flocculate fine impurities in water into large flocs and achieve solid-liquid separation through sedimentation. Specifically, the effluent from the chemical reaction tank 2 enters the coagulation sedimentation tank 3, where polyferric chloride (FeCl3) coagulant is added to cause the flocs to grow, settle, and discharge as sludge, effectively removing colloids, suspended particles, and some organic matter. The key parameters for coagulation sedimentation tank 3 are: FeCl3 dosage 100mg / L-300mg / L, sedimentation time 1h-2h, effluent SS can be reduced to below 50mg / L, and COD removal rate 10%-20%. Furthermore, the coagulation sedimentation tank 3 is equipped with a second mixer 31 and a second online pH meter 32; when polyferric chloride coagulant is added to the coagulation sedimentation tank 3, the second mixer 31 can be started to ensure that the polyferric chloride coagulant is fully mixed with the water; the second online pH meter 32 is used to monitor the pH value of the water in real time.

[0029] Stripping tower 4 is used to transfer ammonia nitrogen in the water in a free state to the gas phase through gas-liquid mass transfer, thereby achieving separation and removal; Specifically, the stripping tower 4 is connected to the coagulation sedimentation tank 3 via a first pumping assembly 41. The first pumping assembly 41 includes an input pipe, an output pipe, and a water pump. The input end of the water pump is connected to the coagulation sedimentation tank 3 via the input pipe, and the output end of the water pump is connected to the stripping tower 4 via the output pipe. By starting the water pump, water in the coagulation sedimentation tank 3 can be input into the stripping tower 4. The bottom of the stripping tower 4 is provided with an air inlet pipe 43 and a first connecting pipe 44, and the top is provided with a tail gas outlet pipe 42. Air is introduced into the stripping tower 4 through the air inlet pipe 43, and the tail gas outlet pipe 42 is connected to a waste gas treatment device to treat the tail gas and prevent pollution. The first connecting pipe 44 is used to connect the stripping tower 4 to the return tank 5. The specific structure of the stripping tower is existing technology and will not be described in detail here.

[0030] It is worth noting that the pH of the effluent from the coagulation sedimentation tank 3 is adjusted to 10-11 before entering the stripping tower 4 "containing packing". Air is introduced into the stripping tower 4 to strip NH3 into the gas phase.

[0031] The key parameters for the stripping tower 4 during operation are: ammonia nitrogen removal rate of 80%-90%, and effluent ammonia nitrogen can be reduced from 1000mg / L to 100-300mg / L; the supporting waste gas treatment is "dilute sulfuric acid absorption to generate ammonium sulfate to avoid ammonia escape and pollution", and the gas-liquid ratio is 1000:1-3000:1. The callback pool 5 is used to adjust the pH value of the water to a preset value.

[0032] Specifically, the water treated by the stripping tower 4 enters the return tank 5 through the first connecting pipe 44. The return tank 5 is used to adjust the pH value of the water effluent from the stripping tower 4 to 6.5-8. Furthermore, the adjustment tank 5 is equipped with a third mixer 51 and a third online pH meter 52. When the reagent is added to the adjustment tank 5 to adjust the pH value, the third mixer 51 can be started to make it evenly mixed, and the pH value of the water in the adjustment tank 5 can be monitored in real time through the third online pH meter 52.

[0033] Biological treatment components are used to decompose, transform, and remove organic and nutrient pollutants in water. In this embodiment, as Figure 2 and 3 As shown, the biological treatment component includes: an anaerobic reactor 6 and a biological treatment tank 7 connected in sequence; Anaerobic reactor 6 is used to degrade organic pollutants in water into biogas; Specifically, anaerobic reactor 6 is an internal circulation anaerobic reactor. Anaerobic reactor 6 is connected to the return tank 5 via a second pumping assembly 61. The second pumping assembly 61 has a similar structure to the first pumping assembly 41, both using pumps to transport water; details will not be elaborated here. Water treated in the return tank 5 is input into anaerobic reactor 6 via the second pumping assembly 61. In the anaerobic environment, acid-producing bacteria decompose large organic molecules into small organic acids, and methanogenic bacteria further convert them into CH4 and CO2. The biogas rising within anaerobic reactor 6 drives the internal circulation of sludge and water. It is worth noting that the generated biogas, after desulfurization, is used for power generation or heating, achieving energy recovery. The generated anaerobic sludge is dewatered and then treated. The operating parameters of anaerobic reactor 6 are: mesophilic temperature (30-35℃), COD removal rate 70%-90% (e.g., reducing from 10000mg / L to 1000-3000mg / L); circulation ratio (5-10:1), and volumetric loading rate of 10-20kgCOD / (m³). d).

[0034] Biological tank 7 is used for the deep removal of nutrient pollutants in the water and the separation of mud and water; Specifically, the anaerobic reactor 6 is connected to the biological treatment tank 7 via a second connecting pipe 62. The biological treatment tank 7 preferentially employs the facultative membrane bioreactor (FMBR) process and is equipped with a membrane separation system 71, an aeration system 72, and a second level gauge 73. The aeration system 72 is used to aerate the water in the biological treatment tank 7, and the second level gauge 73 is used to monitor the water level in the biological treatment tank 7. It is worth noting that the membrane separation system 71 and the aeration system 72 are existing technologies and will not be elaborated upon. The effluent from the anaerobic reactor 6 enters the biological treatment tank 7, where, under the action of high-concentration microorganisms with complex characteristics, pollutants such as carbon, nitrogen, and phosphorus in the wastewater are further decomposed and removed. The effluent is then filtered and separated by an ultrafiltration membrane before being discharged. The key parameters of the membrane separation system 71 are: DO distribution control (2-4 mg / L in the membrane zone, <1 mg / L in other zones), MLSS 10000~25000 mg / L, and hydraulic retention time 18~24 h.

[0035] Biochemical Pool 7 can also be A 2 Existing processes with denitrification and phosphorus removal functions, such as O process, MBBR in biofilm method, and biological contact oxidation method, will not be described in detail here.

[0036] Advanced treatment components are used to degrade recalcitrant organic matter remaining in water.

[0037] In this embodiment, as Figure 3 As shown, the deep treatment component includes: a deep oxidation tank 8, which is used to deeply oxidize and decompose the residual recalcitrant organic matter in the water. Specifically, the deep oxidation tank 8 is equipped with a generator and an electrocatalyst 85. The generator and the electrocatalyst 85 work together to generate an oxidant, which deeply oxidizes and decomposes the residual recalcitrant organic matter in the water. After the deep oxidation tank 8 completes the treatment of the landfill leachate, the effluent quality after treatment by this utility model device can meet the discharge standards of Table 2 of the "Pollution Control Standard for Municipal Solid Waste Landfills" (GB16889-2008) (COD≤100mg / L, ammonia nitrogen≤25mg / L, total nitrogen≤40mg / L, heavy metals meet the standards).

[0038] It is worth noting that the generator is a micro-nano bubble generator 81. The micro-nano bubble generator 81 is connected to the ozone generator via an ozone input pipe 82, and is also connected to the aeration system 72 in the biological treatment tank 7 for oxygen supply, providing smaller bubbles to the aeration system and improving oxygenation efficiency. Ozone is input into the micro-nano bubble generator 81, and the effluent from the biological treatment tank 7 enters the micro-nano bubble generator 81. The micro-nano bubble generator 81 mixes the ozone into the effluent from the biological treatment tank 7, and finally, it enters the deep oxidation tank 8 through the delivery pipe 83. Furthermore, when the effluent from the biological treatment tank 7 enters the deep oxidation tank 8, electrocatalysis and ozone synergistically generate strong oxidizing agents. OH radicals deeply oxidize and remove residual recalcitrant organic matter, ensuring that the effluent meets standards. Operating parameters are: current density 5-30 mA / cm², ozone dosage 50-100 mg / L, and micro-nano bubble diameter 0.1-100 nm.

[0039] Furthermore, the landfill leachate treatment device also includes a power supply component 9, which supplies power to the generator and electrocatalyst 85. The power supply component 9 includes a solar panel 92, an energy storage unit 93, a bus 91, and a power grid 94. The electricity generated by the solar panel 92 is stored in the energy storage unit 93. The energy storage unit 93 and the power grid 94 are connected to the bus 91, and the power supply 84 of the generator and electrocatalyst 85 is also connected to the bus 91. Thus, the solar panel 92 supplies power to the generator and electrocatalyst 85, and the energy storage unit 93, equipped with a lithium battery, can cope with cloudy days, reducing the dependence on the power grid 94.

[0040] Furthermore, such as Figure 4 As shown, the landfill leachate treatment device also includes a sludge discharge pipeline 10, which includes a sludge discharge main pipe 101 and a third pumping assembly 102. The coagulation sedimentation tank 3, the anaerobic reactor 6, and the FMBR biological treatment tank 7 are all connected to the sludge discharge pipeline 10 through the third pumping assembly 102. The sludge generated in the coagulation sedimentation tank 3, the anaerobic reactor 6, and the FMBR biological treatment tank 7 is discharged through the sludge discharge pipeline 10. Specifically, the third pumping assembly 102 includes a sludge discharge sub-pipe and a water pump mounted on the sludge discharge sub-pipe. By starting the water pump, the sludge in the coagulation sedimentation tank 3, the anaerobic reactor 6 and the FMBR biological treatment tank 7 is input into the sludge discharge main pipe 101 and finally discharged.

[0041] In summary, this utility model can achieve the following effects: By rationally arranging the equipment, a compact layout can be achieved, enabling effective treatment of small-scale, difficult-to-treat organophosphorus pesticide wastewater.

[0042] High-efficiency pollutant removal: Through pretreatment, physicochemical treatment, biological treatment, and advanced treatment components, pollutant concentrations are reduced in stages to achieve high-efficiency pollutant removal. Synergistic and efficient: Chemical reaction tank 2 and stripping tower 4 share alkalinity regulation, and the pre-positioning of coagulation sedimentation tank 3 can reduce the risk of blockage in stripping tower 4. Moreover, the units are closely connected to achieve synergistic and efficient results. Resource recycling: Anaerobic reactor 6 produces biogas, stripping tower 4 recovers ammonium sulfate, and solar power panels 92 generate electricity, achieving the effect of "turning waste into treasure".

[0043] Deep compliance: The combination of biological treatment tank 7 and deep oxidation tank 8 overcomes recalcitrant pollutants and ensures stable compliance of effluent. In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A landfill leachate treatment device, characterized in that, include: The pretreatment component, physicochemical treatment component, biological treatment component, and deep treatment component are connected in sequence. The leachate to be treated is sequentially processed by the pretreatment component, the physicochemical treatment component, the biological treatment component, and the advanced treatment component before being discharged. The pretreatment component is used to intercept and separate physical impurities in the incoming water; The physicochemical treatment component is used to remove heavy metals, phosphates and suspended pollutants from water; The biological treatment component is used to decompose, transform, and remove organic and nutrient pollutants in water. The deep treatment component is used to degrade residual recalcitrant organic matter in water.

2. The landfill leachate treatment device according to claim 1, characterized in that, The pretreatment components include: a bar screen; the bar screen is used to intercept large suspended solids, floating objects and coarse impurities in the water.

3. The landfill leachate treatment device according to claim 2, characterized in that, The physicochemical treatment components include: a chemical reaction tank, a coagulation sedimentation tank, a stripping tower, and a return tank connected in sequence; The chemical reaction tank is used to remove pollutants from the water through sedimentation. The coagulation sedimentation tank is used to flocculate fine impurities in water into large flocs and achieve solid-liquid separation through sedimentation. The stripping tower is used to transfer ammonia nitrogen in the water in a free state to the gas phase through gas-liquid mass transfer, thereby achieving separation and removal; The callback pool is used to adjust the pH value of the water to a preset value.

4. The landfill leachate treatment device according to claim 3, characterized in that, The biological treatment component includes an anaerobic reactor and a biochemical tank connected in sequence. The anaerobic reactor is used to degrade organic pollutants in water into biogas; The biological treatment tank is used for the deep removal of nutrient pollutants from the water and for the separation of mud and water.

5. The landfill leachate treatment device according to claim 4, characterized in that, The advanced treatment component includes an advanced oxidation tank, which is used to deeply oxidize and decompose residual recalcitrant organic matter in the water.

6. The landfill leachate treatment device according to claim 5, characterized in that, The deep oxidation tank is equipped with a generator and an electrocatalyst. The generator and the electrocatalyst work together to produce an oxidant, which deeply oxidizes and decomposes the residual recalcitrant organic matter in the water.

7. The landfill leachate treatment device according to claim 6, characterized in that, The landfill leachate treatment device also includes a power supply component, which is used to supply power to the generator and the electrocatalyst. The power supply components include: a solar panel, an energy storage device, a bus, and a power grid; the electricity generated by the solar panel is stored in the energy storage device; the energy storage device and the power grid are connected to the bus, and the generator and the electrocatalyst are also connected to the bus.

8. The landfill leachate treatment device according to claim 5, characterized in that, The landfill leachate treatment device also includes a sludge discharge pipeline, which includes a main sludge discharge pipe and a third pumping assembly. The coagulation sedimentation tank, the anaerobic reactor, and the biological treatment tank are all connected to the sludge discharge pipeline through the third pumping assembly, and the sludge generated in the coagulation sedimentation tank, the anaerobic reactor, and the biological treatment tank is discharged through the sludge discharge pipeline.

9. The landfill leachate treatment device according to claim 3, characterized in that, The chemical reaction tank is equipped with a first stirrer, a first online pH meter, and a first level gauge.

10. The landfill leachate treatment device according to claim 3, characterized in that, The coagulation sedimentation tank is equipped with a second mixer and a second online pH meter.

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