Landfill leachate treatment system

Abstract

The utility model discloses a landfill leachate treatment system and relates to the technical field of high-difficulty degradation-resistant wastewater treatment. Comprising an oil separation tank, an adjusting tank, an adjusting tank lifting pump, a high-pressure dissolved air flotation structure, a hydrolysis acidification tank, a hydrolysis acidification tank lifting pump, an up-flow anaerobic sludge blanket reactor, an A / O + MBR membrane bioreactor, an MBR water producing pump, an MBR water producing tank, a nanofiltration assembly and a reverse osmosis assembly which are sequentially communicated in series through pipelines, the high-pressure dissolved air flotation structure, the A / O + MBR membrane bioreactor, the nanofiltration assembly and the reverse osmosis assembly are respectively communicated with a dosing assembly. According to the utility model, the operation cost is low, an advanced oxidation process is not adopted, the operation energy consumption and medicament consumption of the system are greatly reduced, pollutants in the household garbage leachate can be effectively degraded and removed, and the problem of discharging the leachate is thoroughly solved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-difficulty and refractory wastewater treatment, in particular to a landfill leachate treatment system. Background Art

[0002] With the acceleration of the urbanization process and the improvement of the living standards of residents, the amount of urban domestic waste is increasing continuously. Landfill leachate has the characteristics of high concentration, complex composition, unbalanced nutrient ratio, high toxicity, and difficulty in degradation, which causes great harm to the environment. Its treatment technology is still a key research topic in the field of wastewater treatment at the present stage. The traditional landfill leachate treatment process has problems such as unreasonable process setting, high treatment cost, poor treatment effect, and low resource recycling rate. Therefore, a new treatment process and its treatment unit are needed to improve the treatment effect and resource recycling rate.

[0003] The technologies for treating leachate at home and abroad mainly include biological treatment, physicochemical treatment, membrane treatment and other processes. Among them, biological treatment is a commonly used method for treating landfill leachate, which has the advantages of high efficiency and low cost, and is suitable for the treatment of leachate with good biodegradability, including anaerobic treatment, anoxic treatment, aerobic treatment or a combination of several methods. The advantage of physicochemical treatment lies in its good treatment effect on landfill leachate with poor biodegradability and difficult biodegradation. Common physical and chemical methods include adsorption, coagulation precipitation, electrochemistry, advanced catalytic oxidation, Fenton method, etc. The physicochemical method has little influence on water quality and water quantity, and the effluent water quality is relatively stable, but the cost is relatively high. The membrane treatment method can intercept pollutants with particle sizes larger than the membrane pore diameter. According to different water qualities, technologies such as microfiltration, nanofiltration, ultrafiltration and reverse osmosis have been widely applied in actual projects. However, the water quality of landfill leachate is poor, which is easy to cause problems such as membrane fouling and blockage.

[0004] Most of the above treatment methods focus on physicochemical methods to remove refractory organic matter in the treatment of leachate. For example, electrochemistry, advanced catalytic oxidation, Fenton method, etc. are used. The disadvantage of doing so is that the consumption of chemicals and power is large, and the treatment cost is high; the reverse osmosis membrane is prone to fouling and scaling before effective pretreatment, and it is difficult to operate continuously for a long time.

[0005] Therefore, the utility model provides a landfill leachate treatment system to solve the problems existing in the above-mentioned prior art. Summary of the Utility Model

[0006] To achieve the above object, the present utility model provides the following solution: The present utility model provides a landfill leachate treatment system, which includes an oil separation tank, an adjustment tank, an adjustment tank lift pump, a high-pressure dissolved air flotation structure, a hydrolysis acidification tank, a hydrolysis acidification tank lift pump, an upflow anaerobic sludge bed reactor, an A / O + MBR membrane bioreactor, an MBR product water pump, an MBR product water tank, a nanofiltration module, and a reverse osmosis module connected in series through pipelines in sequence. The nanofiltration module and the reverse osmosis module are respectively connected to a concentrated water tank, and the high-pressure dissolved air flotation structure, the A / O + MBR membrane bioreactor, the nanofiltration module, and the reverse osmosis module are respectively connected to a chemical dosing module.

[0007] Preferably, the nanofiltration module includes a nanofiltration inlet water pump, a nanofiltration precision filter, a nanofiltration high-pressure pump, a nanofiltration membrane module, and a nanofiltration product water tank connected in sequence through pipelines. The nanofiltration inlet water pump is connected to the MBR product water tank, the nanofiltration product water tank is connected to the reverse osmosis module, and the nanofiltration membrane module is connected to the concentrated water tank.

[0008] Preferably, the reverse osmosis module includes a reverse osmosis inlet water pump, a reverse osmosis precision filter, a reverse osmosis high-pressure pump, a reverse osmosis membrane module, a reverse osmosis product water tank, and a reverse osmosis outlet water pump connected in sequence through pipelines. The reverse osmosis inlet water pump is connected to the nanofiltration product water tank, and the reverse osmosis membrane module is connected to the concentrated water tank.

[0009] Preferably, the chemical dosing module includes an alkali chemical dosing device, a PAC chemical dosing device, a PAM chemical dosing device, a scale inhibitor chemical dosing device, a bactericide chemical dosing device, a reducing agent chemical dosing device, and a sodium hypochlorite chemical dosing device. The alkali chemical dosing device, the PAC chemical dosing device, and the PAM chemical dosing device are all connected to the high-pressure dissolved air flotation structure. The scale inhibitor chemical dosing device, the bactericide chemical dosing device, and the reducing agent chemical dosing device are respectively connected to the nanofiltration inlet water pump and the reverse osmosis inlet water pump, and the sodium hypochlorite chemical dosing device is connected to the A / O + MBR membrane bioreactor.

[0010] Preferably, the concentrated water tank is connected to a concentrated water pump.

[0011] Preferably, a mesh basket grille and floating oil baffles staggered up and down are provided in the oil separation tank.

[0012] Preferably, a submersible stirrer and a liquid level controller are provided in the hydrolysis acidification tank.

[0013] Preferably, the A / O + MBR membrane bioreactor includes a first-stage anaerobic tank, a first-stage aerobic tank, a second-stage anaerobic tank, a second-stage aerobic tank, and a membrane tank. The A / O + MBR membrane bioreactor is filled with combined packing.

[0014] The utility model discloses the following technical effects: After the leachate is pretreated by an oil separation tank, an adjustment tank, an adjustment tank lift pump, and a high-pressure dissolved air flotation structure, substances such as oils, suspended solids, and organic matters are removed. Then, through biological treatment stages such as a hydrolysis acidification tank, a hydrolysis acidification tank lift pump, an upflow anaerobic sludge bed reactor, an A / O+MBR membrane bioreactor, an MBR product water pump, and an MBR product water tank, the remaining refractory organic matters in the water are effectively decomposed, which is beneficial to reducing the subsequent aerobic biological treatment load and improving the treatment effect. Finally, through the advanced treatment of a nanofiltration module and a reverse osmosis module, the treated leachate meets the discharge requirements, saving a large amount of water resources and effectively reducing the total pollutant emissions. The utility model effectively decomposes the refractory organic matters in the leachate and has a high treatment efficiency; through the nanofiltration module and the reverse osmosis module, the effluent quality can meet the relevant discharge requirements, saving a large amount of water resources, having good effluent quality, and enabling resource utilization; and the pollutants are removed thoroughly, all the treated water is recycled, and the concentrated water is returned to the waste incinerator for incineration to achieve zero discharge and effectively reduce the total pollutant emissions; at the same time, the operation and management are simple, the whole set of the process system is automatically controlled by a PLC, and the daily operation only requires adding agents regularly, with low labor intensity of personnel; in addition, the utility model operates stably, has a strong shock load resistance ability, the effluent quality and operation are less affected by the water quality and water volume, and it can achieve a good pretreatment effect, effectively ensuring the stability of the water quality entering the biological treatment stage; moreover, the utility model has a low operation cost, does not adopt an advanced oxidation process, greatly reduces the system operation energy consumption and agent consumption, and can also effectively degrade and remove the pollutants in the domestic waste leachate, completely solving the problem of the discharge outlet of the leachate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0016] Figure 1 is a structural schematic diagram of the utility model;

[0017] In the figure: 1. Oil separation tank; 2. Regulation tank; 3. Regulation tank lift pump; 4. High-pressure dissolved air flotation structure; 5. Hydrolysis acidification tank; 6. Hydrolysis acidification tank lift pump; 7. Upflow anaerobic sludge bed reactor; 8. A / O + MBR membrane bioreactor; 9. MBR product water pump; 10. MBR product water tank; 11-1. Nanofiltration feed water pump; 11-2. Nanofiltration precision filter; 11-3. Nanofiltration high-pressure pump; 11-4. Nanofiltration membrane module; 11-5. Nanofiltration product water tank; 12-1. Reverse osmosis feed water pump; 12-2. Reverse osmosis precision filter; 12-3. Reverse osmosis high-pressure pump; 12-4. Reverse osmosis membrane module; 12-5. Reverse osmosis product water tank; 13. Concentrate water tank; 13-1. Concentrate water pump; 14-1. Alkali dosing device; 14-2. PAC dosing device; 14-3. PAM dosing device; 14-4. Scale inhibitor dosing device; 14-5. Bactericide dosing device; 14-6. Reducing agent dosing device; 14-7. Sodium hypochlorite dosing device. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0020] Referring to Figure 1 As shown, this embodiment provides a landfill leachate treatment system, including an oil separation tank 1, a regulation tank 2, a regulation tank lift pump 3, a high-pressure dissolved air flotation structure 4, a hydrolysis acidification tank 5, a hydrolysis acidification tank lift pump 6, an upflow anaerobic sludge bed reactor 7, an A / O + MBR membrane bioreactor 8, an MBR product water pump 9, an MBR product water tank 10, a nanofiltration module, and a reverse osmosis module, which are connected in series and communicated through pipelines in sequence. The nanofiltration module and the reverse osmosis module are respectively communicated with a concentrate water tank 13, and the high-pressure dissolved air flotation structure 4, the A / O + MBR membrane bioreactor 8, the nanofiltration module, and the reverse osmosis module are respectively communicated with a dosing assembly.

[0021] After the leachate is pretreated by the oil separator 1, the regulating tank 2, the regulating tank lift pump 3, and the high-pressure dissolved air flotation structure 4, substances such as oils, suspended solids, and organic matters are removed. The function of the regulating tank 2 is to fully balance the water quality and quantity of the landfill leachate. Then, through biological treatment stages such as the hydrolysis acidification tank 5, the hydrolysis acidification tank lift pump 6, the upflow anaerobic sludge bed reactor 7, the A / O + MBR membrane bioreactor 8, the MBR product water pump 9, and the MBR product water tank 10, the remaining refractory organic matters in the water are effectively decomposed, which is beneficial to reducing the subsequent aerobic biological treatment load and improving the treatment effect. Finally, through the advanced treatment of the nanofiltration module and the reverse osmosis module, the treated leachate meets the discharge requirements, saving a large amount of water resources and effectively reducing the total pollutant emissions. The utility model effectively decomposes the refractory organic matters in the leachate, with high treatment efficiency; through the nanofiltration module and the reverse osmosis module, the effluent water quality can meet the relevant discharge requirements, saving a large amount of water resources, with good effluent water quality, and can realize resource utilization; and the pollutants are removed thoroughly, all the treated water is recycled, and the concentrated water is returned to the waste incinerator for incineration, achieving zero discharge and effectively reducing the total pollutant emissions; at the same time, the operation and management are simple, the whole set of the process system is automatically controlled by PLC, and the daily operation only requires adding chemicals regularly, with low labor intensity of personnel; in addition, the utility model operates stably, has strong shock load resistance, the effluent water quality and operation are less affected by the water quality and quantity, can achieve good pretreatment effect, and can effectively ensure the stability of the water quality entering the biological treatment stage; moreover, the utility model has low operation cost, does not adopt the advanced oxidation process, greatly reduces the system operation energy consumption and chemical consumption, and can also effectively degrade and remove the pollutants in the domestic waste leachate, completely solving the problem of the discharge outlet of the leachate.

[0022] In a further optimized solution, the nanofiltration module includes a nanofiltration feed pump 11-1, a nanofiltration precision filter 11-2, a nanofiltration high-pressure pump 11-3, a nanofiltration membrane module 11-4, and a nanofiltration product water tank 11-5 that are connected in sequence through pipelines. The nanofiltration feed pump 11-1 is connected to the MBR product water tank 10, the nanofiltration product water tank 11-5 is connected to the reverse osmosis module, and the nanofiltration membrane module 11-4 is connected to the concentrated water tank 13. Scale inhibitors, biocides, and reducing agents are added in front of the nanofiltration precision filter 11-2 to reduce the pollution and blockage of the nanofiltration membrane.

[0023] In a further optimized solution, the reverse osmosis module includes a reverse osmosis feed pump 12-1, a reverse osmosis precision filter 12-2, a reverse osmosis high-pressure pump 12-3, a reverse osmosis membrane module 12-4, a reverse osmosis product water tank 12-5, and a reverse osmosis product water pump that are connected in sequence through pipelines. The reverse osmosis feed pump 12-1 is connected to the nanofiltration product water tank 11-5, and the reverse osmosis membrane module 12-4 is connected to the concentrated water tank 13. Scale inhibitors, biocides, and reducing agents are added in front of the reverse osmosis precision filter 12-2 to reduce the pollution and blockage of the reverse osmosis membrane.

[0024] For a further optimized solution, the chemical dosing assembly includes an alkali dosing device 14-1, a PAC dosing device 14-2, a PAM dosing device 14-3, a scale inhibitor dosing device 14-4, a bactericide dosing device 14-5, a reducing agent dosing device 14-6, and a sodium hypochlorite dosing device 14-7. The alkali dosing device 14-1, the PAC dosing device 14-2, and the PAM dosing device 14-3 are all connected to the high-pressure dissolved air flotation structure 4. The scale inhibitor dosing device 14-4, the bactericide dosing device 14-5, and the reducing agent dosing device 14-6 are respectively connected to the nanofiltration inlet water pump 11-1 and the reverse osmosis inlet water pump 12-1. The sodium hypochlorite dosing device 14-7 is connected to the A / O+MBR membrane bioreactor 8. By adding chemicals such as alkali, PAC, and PAM into the high-pressure dissolved air flotation structure 4, the pH value of the landfill leachate can be adjusted, and the removal of suspended solids, emulsified oil, and some organic matters can be enhanced through coagulation flotation. When cleaning the MBR membrane, the sodium hypochlorite dosing device 14-7 adds 500 mg / L of sodium hypochlorite into the A / O+MBR membrane bioreactor 8.

[0025] Furthermore, the interior of the upflow anaerobic sludge bed reactor 7 consists of an influent distribution system, a reaction zone, a three-phase separator, an effluent system, and a sludge discharge system.

[0026] For a further optimized solution, the concentrated water tank 13 is connected to a concentrated water pump 13-1. The water in the concentrated water tank 13 is lifted by the concentrated water pump 13-1 to the waste incinerator for incineration treatment without external discharge.

[0027] For a further optimized solution, a mesh basket grille and floating oil baffles staggered up and down are provided in the oil separation tank 1. The mesh basket grille and the floating oil baffles staggered up and down can remove floating oil and large particle suspended solids.

[0028] For a further optimized solution, a submersible mixer and a liquid level controller are provided in the hydrolysis acidification tank 5. Through hydrolysis, the submersible mixer and the liquid level controller greatly increase the biodegradability of the landfill leachate and improve the treatment efficiency of subsequent biological treatment.

[0029] For a further optimized solution, the A / O+MBR membrane bioreactor 8 includes a first-stage anaerobic tank, a first-stage aerobic tank, a second-stage anaerobic tank, a second-stage aerobic tank, and a membrane tank. The A / O+MBR membrane bioreactor 8 is filled with combined packing. A reflux pipeline for denitrification is provided between the first-stage aerobic tank and the first-stage anaerobic tank; a reflux pipeline for anaerobic phosphorus release is provided between the membrane tank and the first-stage anaerobic tank; a reflux pipeline for balancing the sludge concentration is provided between the membrane tank and the first-stage aerobic tank; a reflux pipeline for balancing the sludge concentration is provided between the membrane tank and the second-stage aerobic tank; in addition, the combined packing is a suspended high-efficiency biological packing, which increases the attachment ability of microorganisms and enhances the treatment ability and adaptability of the reactor.

[0030] Furthermore, the functions of each unit of the A / O+MBR membrane bioreactor 8 are as follows:

[0031] The effluent from the upflow anaerobic sludge bed reactor 7 enters the primary anaerobic tank. The primary function of this unit is nitrogen removal, which is mainly achieved through the internal reflux of nitrate-nitrogen-containing sewage from the primary aerobic tank. The second function of this unit is phosphorus release from sludge, which is mainly achieved through the external reflux of phosphorus-containing sludge from the membrane tank.

[0032] The mixed liquor treated in the primary anaerobic tank enters the primary aerobic tank, and its functions are as follows: First, it removes BOD and removes the organic pollutants brought in by the raw sewage; second, it nitrifies. However, due to the still relatively high BOD concentration, the nitrification degree is relatively low, and the generated NO3-N is also less; third, the phosphorus-accumulating bacteria absorb phosphorus. According to the phosphorus removal mechanism, only after the effective removal of NOx can a good phosphorus removal effect be achieved. Therefore, in the primary aerobic tank, the phosphorus absorption effect is not very good.

[0033] The mixed liquor enters the secondary anaerobic tank. The functions of this unit are the same as those of the first anaerobic reactor. The main function is nitrogen removal; the second is phosphorus release.

[0034] The primary function of the secondary aerobic tank is phosphorus absorption, the secondary function is further nitrification, and it also has the function of further removing BOD.

[0035] The main function of the membrane tank is the separation of mud and water. The filtered water enters the next treatment unit as treated water. Part of the phosphorus-containing sludge is used as reflux sludge and refluxed to the primary anaerobic tank, and the other part is discharged from the system as surplus sludge.

[0036] The water treatment steps of this system are as follows:

[0037] The leachate enters the oil separation tank 1, which is equipped with a mesh basket grille and floating oil baffles that cross up and down, and can remove floating oil and large particle suspended solids.

[0038] The residence time of the oil separation tank 1 is 2h, and the effluent enters the regulation tank 2 to regulate the water quality and water volume.

[0039] The residence time of the regulation tank 2 is 170h, and the effluent enters the high-pressure dissolved air flotation structure 4 through the regulation tank lift pump 3. Through the alkali dosing device 14-1, PAC dosing device 14-2, and PAM dosing device 14-3, chemicals such as alkali, PAC, and PAM are added into the high-pressure dissolved air flotation structure 4 to adjust the pH value of the landfill leachate, and the removal of suspended solids, emulsified oil, and part of the organic matter is strengthened through coagulation and flotation.

[0040] The effluent from the high-pressure dissolved air flotation structure 4 enters the hydrolysis acidification tank 5 for hydrolysis acidification treatment. The residence time of the hydrolysis acidification tank 5 is 24h.

[0041] The water in the hydrolysis acidification tank 5 enters the upflow anaerobic sludge bed reactor 7 through the hydrolysis acidification tank lift pump 6 for anaerobic treatment. The hydraulic retention time of the upflow anaerobic sludge bed reactor 7 is 192 h, and it consists of an influent distribution system, a reaction zone, a three-phase separator, an effluent system, and a sludge discharge system inside.

[0042] The effluent of the upflow anaerobic sludge bed reactor 7 enters the A / O + MBR membrane bioreactor 8 for biological treatment to further remove organic matter and nutrients such as nitrogen and phosphorus. The A / O + MBR membrane bioreactor 8 consists of a first-stage anaerobic tank, a first-stage aerobic tank, a second-stage anaerobic tank, a second-stage aerobic tank, and a membrane tank; among them, the hydraulic retention time of the first-stage anaerobic tank is 12 h, and the dissolved oxygen concentration is less than 0.5 mg / L; the hydraulic retention time of the first-stage aerobic tank is 24 h, and the dissolved oxygen concentration is 2.0 - 4.0 mg / L; the hydraulic retention time of the second-stage anaerobic tank is 12 h, and the dissolved oxygen concentration is less than 0.5 mg / L; the hydraulic retention time of the second-stage aerobic tank is 24 h, and the dissolved oxygen concentration is 2.0 - 4.0 mg / L; the hydraulic retention time of the membrane tank is 12 h. There is a reflux pipeline for denitrification between the first-stage aerobic tank and the first-stage anaerobic tank, with a reflux ratio of 200%; there is a reflux pipeline for anaerobic phosphorus release between the membrane tank and the first-stage anaerobic tank, with a reflux ratio of 100%; there is a reflux pipeline for equalizing the sludge concentration between the membrane tank and the first-stage aerobic tank, with a reflux ratio of 200%; there is a reflux pipeline for equalizing the sludge concentration between the membrane tank and the second-stage aerobic tank, with a reflux ratio of 200%; the A / O + MBR membrane bioreactor 8 is filled with biological fillers, and the specific surface area of the fillers is 300 m 2 / m 3 , the filler filling rate is 60%; the A / O + MBR membrane bioreactor 8 is also equipped with a sodium hypochlorite dosing device 14 - 7. When cleaning the MBR membrane, the sodium hypochlorite dosing device 14 - 7 doses 500 mg / L of sodium hypochlorite into the A / O + MBR membrane bioreactor 8.

[0043] The effluent of the A / O + MBR membrane bioreactor 8 enters the MBR product water tank 10 through the MBR product water pump 9, and then is sent to the nanofiltration module for advanced treatment. After adding 5 mg / L of scale inhibitor, 5 mg / L of bactericide, and 3 mg / L of reducing agent respectively through the scale inhibitor dosing device 14 - 4, the bactericide dosing device 14 - 5, and the reducing agent dosing device 14 - 6 to the nanofiltration influent, it then enters the nanofiltration high-pressure pump 11 - 3 for pressurization through the nanofiltration precision filter 11 - 2, and enters the nanofiltration product water tank 11 - 5 after being filtered by the nanofiltration membrane module 11 - 4.

[0044] The nanofiltration product water enters the reverse osmosis module for further treatment. The effluent of the reverse osmosis module enters the reverse osmosis product water tank 12-5. After adding 5 mg / L of scale inhibitor, 5 mg / L of bactericide, and 3 mg / L of reducing agent respectively through the scale inhibitor dosing device 14-4, the bactericide dosing device 14-5, and the reducing agent dosing device 14-6 to the reverse osmosis feed water, it then enters the reverse osmosis high-pressure pump 12-3 for pressurization through the reverse osmosis precision filter 12-2, and after being filtered by the reverse osmosis membrane module 12-4, it enters the reverse osmosis product water tank 12-5.

[0045] The concentrated water discharge outlets of the nanofiltration module and the reverse osmosis module are connected to the concentrated water tank 13. The concentrated water is lifted by the concentrated water pump 13-1 to the waste incinerator for incineration treatment and is not discharged externally.

[0046] Comparison of the effects before and after leachate treatment:

[0047] Before treatment: The water volume is 100 tons per day, the pH is 6, the COD Cr concentration is 30,000 - 60,000 mg / L, the BOD5 concentration is 15,000 - 30,000 mg / L, the ammonia nitrogen concentration is 1,500 - 3,500 mg / L, the total nitrogen is 1,800 - 4,000 mg / L, the total phosphorus is 70 - 100 mg / L, and the salt content is 5,000 - 15,000 mg / L.

[0048] After treatment: The effluent COD Cr is 20 mg / l, the BOD5 concentration is 4.5 mg / L, the ammonia nitrogen is 0.8 mg / L, SS is not detectable, the pH value is 6.5 - 8.5, it is colorless and transparent, and the conductivity is 260 μs / cm.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0050] The above-described embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A landfill leachate treatment system, characterized in that: The invention comprises a grease trap (1), a regulating tank (2), a regulating tank lift pump (3), a high-pressure dissolved air flotation structure (4), a hydrolysis and acidification tank (5), a hydrolysis and acidification tank lift pump (6), an upflow anaerobic sludge blanket reactor (7), an A / O+MBR membrane bioreactor (8), an MBR water production pump (9), an MBR water production tank (10), a nanofiltration component and a reverse osmosis component, which are sequentially connected in series through pipelines. The nanofiltration component and the reverse osmosis component are respectively connected to a concentrated water tank (13), and the high-pressure dissolved air flotation structure (4), the A / O+MBR membrane bioreactor (8), the nanofiltration component and the reverse osmosis component are respectively connected to a dosing component.

2. The landfill leachate treatment system according to claim 1, characterized in that: The nanofiltration component comprises a nanofiltration inlet pump (11-1), a nanofiltration precision filter (11-2), a nanofiltration high-pressure pump (11-3), a nanofiltration membrane component (11-4) and a nanofiltration water production tank (11-5) which are sequentially connected through pipelines; the nanofiltration inlet pump (11-1) is connected to the MBR water production tank (10), the nanofiltration water production tank (11-5) is connected to the reverse osmosis component, and the nanofiltration membrane component (11-4) is connected to the concentrated water tank (13).

3. The landfill leachate treatment system according to claim 2, characterized in that: The reverse osmosis component comprises a reverse osmosis water inlet pump (12-1), a reverse osmosis precision filter (12-2), a reverse osmosis high-pressure pump (12-3), a reverse osmosis membrane component (12-4), a reverse osmosis water production tank (12-5) and a reverse osmosis water outlet pump which are sequentially connected through pipelines; the reverse osmosis water inlet pump (12-1) is connected to the nanofiltration water production tank (11-5), and the reverse osmosis membrane component (12-4) is connected to the concentrated water tank (13).

4. The landfill leachate treatment system according to claim 3, characterized in that: The dosing assembly comprises an alkali doser (14-1), a PAC doser (14-2), a PAM doser (14-3), an antiscalant doser (14-4), a bactericide doser (14-5), a reductant doser (14-6), and a sodium hypochlorite doser (14-7). The alkali doser (14-1), the PAC doser (14-2), and the PAM doser (14-3) are all connected to the high-pressure dissolved air flotation structure (4); the antiscalant doser (14-4), the bactericide doser (14-5), and the reductant doser (14-6) are respectively connected to the nanofiltration inlet pump (11-1) and the reverse osmosis inlet pump (12-1); and the sodium hypochlorite doser (14-7) is connected to the A / O+MBR membrane bioreactor (8).

5. The landfill leachate treatment system according to claim 4, characterized in that: The concentrated water tank (13) is connected to a concentrated water pump (13-1).

6. The landfill leachate treatment system according to claim 1, characterized in that: The grease trap (1) is provided with a mesh basket grille and upper and lower staggered floating oil baffles.

7. The landfill leachate treatment system according to claim 1, characterized in that: A submersible agitator and a liquid level controller are provided in the hydrolysis acidification tank (5).

8. The landfill leachate treatment system according to claim 1, characterized in that: The A / O+MBR membrane bioreactor (8) comprises a primary anaerobic tank, a primary aerobic tank, a secondary anaerobic tank, a secondary aerobic tank and a membrane tank. The A / O+MBR membrane bioreactor (8) is filled with a composite filler.

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