CN115093082A - Waste water treatment process and device for landfill leachate and DTRO concentrated solution - Google Patents
Waste water treatment process and device for landfill leachate and DTRO concentrated solution Download PDFInfo
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- CN115093082A CN115093082A CN202210833522.4A CN202210833522A CN115093082A CN 115093082 A CN115093082 A CN 115093082A CN 202210833522 A CN202210833522 A CN 202210833522A CN 115093082 A CN115093082 A CN 115093082A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- Water Treatment By Electricity Or Magnetism (AREA)
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Abstract
The invention provides a waste water treatment process and device for landfill leachate and DTRO concentrated solution. Reduction of waste by electrochemical desalinationThe conductivity of the water is below 30000 us/cm, the main process for removing COD and ammonia nitrogen denitrogenation selects an economical and technically feasible aerobic biological technology, and the COD is removed by advanced treatment. Finally, the requirements of wastewater full-scale treatment are met through electrocatalytic oxidation and a high-efficiency denitrification tower. The invention has corresponding impact resistance and strain capacity to the change of the water inlet quantity and the water quality, and has counter measures to the seasonal change of the leachate, and the salt removal rate in the landfill leachate wastewater is more than 70-90%; the extension of the sludge age and the removal of organic pollutants by high-concentration microorganisms are greatly improved; high total nitrogen removal efficiency and denitrification load up to 1 kg.N/m 3 D, more than five times of the traditional biochemical process.
Description
Technical Field
The invention belongs to the technical field of landfill leachate treatment, and particularly relates to a process and a device for treating mixed wastewater of landfill leachate and a DTRO concentrated solution.
Background
The landfill leachate is mainly generated in a landfill storage pit and is characterized by high pollutant concentration, complex components, large amount of pollutants such as organic matters, ammonia nitrogen, heavy metals, inorganic salts and the like, belongs to high-concentration organic wastewater, has high ammonia nitrogen content, and has the main pollutant characterization values of CODcr and NH 3 -N, SS and the like. The leachate treatment station current situation only adopts two-stage DTRO to carry out physics and holds back, and the clear solution of output is the desalinized water after two-stage RO holds back, and whole system is got back again through the mode of concentrate recharge landfill field to basically all pollutants in the leachate, can't solve leachate treatment problem at the root. The pollutants are accumulated for a long time, high-concentration wastewater with high salinity (the conductivity reaches 56000 us/cm, the conductivity of the leachate is only 25000 us/cm), high organic matters and high ammonia nitrogen (the ammonia nitrogen reaches 3500mg/L, and the ammonia nitrogen of the leachate is only about 1500 mg/L) is finally generated, the wastewater treatment difficulty is large,The investment and operating costs are very high.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects and shortcomings in the background technology and aiming at the problem that the conventional percolate treatment process is not ideal, and provides a process and a device for treating mixed wastewater of landfill percolate and disc tube type high-pressure reverse osmosis concentrated solution (DTRO concentrated solution for short). The invention firstly reduces the conductivity of the wastewater to be below 30000 us/cm, and the COD removal and ammonia nitrogen removal main process selects an economical and technically feasible aerobic biological technology for advanced treatment to remove COD. Finally, the requirements of wastewater full-scale treatment are met through electrocatalytic oxidation and a high-efficiency denitrification tower.
In order to achieve the purpose, the invention provides the following technical scheme:
a process for treating mixed wastewater of landfill leachate and DTRO concentrated solution comprises the following steps:
s1 removing solid pollutants: filtering the mixed wastewater of the landfill leachate and the DTRO concentrated solution to remove solid pollutants to obtain sewage;
s2 desalting: carrying out oxidation desalination and electrostatic adsorption desalination on the sewage obtained in the step S1;
s3 biodegradation: coagulating and precipitating the sewage obtained in the step S2, and then removing COD, BOD and NH by denitrification and nitrification treatment 3 -N, obtaining a mixed liquor;
and (3) S4 ultrafiltration membrane treatment: intercepting the sludge of the mixed liquid obtained in the step S3 by an external membrane bioreactor provided with an ultrafiltration membrane, discharging the discharged water, and refluxing the sludge to a denitrification program;
and S5 deep processing: carrying out nanofiltration treatment on the effluent obtained in the step S4 through a nanofiltration membrane to discharge small molecular salt along with the effluent to obtain clear liquid and nanofiltration concentrated solution;
and (3) further treating the S6 nanofiltration liquid: and (4) performing electrocatalytic oxidation on the nanofiltration concentrated solution obtained in the step (S5) to further remove COD and ammonia nitrogen, and performing denitrification treatment to obtain clear solution.
The coagulation is used for removing suspended matters and colloids in the sewage, including partially adsorbed inorganic salts. Coagulation works by the theory of compression double electric layers and the principle of adsorption electric neutralization, adsorption bridging and net compensation. The precipitation comprises four stages of free precipitation, flocculation precipitation, crowded precipitation and compression precipitation. The main function of the precipitate is to separate the flocculated SS, colloid and part of inorganic salts from water, so that clear water directly enters the next reaction stage, and the precipitate is formed into solid for outward transportation and landfill or resource utilization in a filter pressing mode.
Preferably, the denitrification and nitrification processes in the step S3 are performed in an MBR (membrane bioreactor) provided with an ultrafiltration membrane, and the sludge concentration in the MBR is 10-30 g/L.
Preferably, in step S1, the solid contaminants are removed by filtration using a bag filter; in step S2, carrying out oxidation desalting and electrostatic adsorption desalting by an electrochemical system; in step S3, respectively carrying out coagulation and sedimentation through a coagulation tank and a sedimentation tank, and respectively carrying out nitrification and denitrification treatment through a denitrification system and a nitrification system; s4, forming an ultrafiltration membrane system by the external membrane bioreactor; the nanofiltration membrane in the step S5 forms a nanofiltration membrane system; step S6, carrying out electrocatalytic oxidation through an electrocatalytic oxidation system, and carrying out denitrification treatment in a high-efficiency denitrification tower; storing clear liquid obtained by nanofiltration treatment and denitrification treatment into a clear liquid pool for discharging; the impurities generated by coagulation, sedimentation and nitration are recovered by a sludge treatment system, and the sludge is discharged into a sludge storage tank and is treated by a filter press to be buried.
Based on a general inventive concept, the invention also provides a device for treating the mixed wastewater of the landfill leachate and the DTRO concentrated solution, which comprises the following parts: the system comprises a bag filter, an electrochemical system, a coagulation tank, a sedimentation tank, a water outlet tank, a denitrification system, a nitrification system, an ultrafiltration membrane system, an ultrafiltration water production tank, a nanofiltration system, a clear liquid tank, a sludge treatment system, an electrocatalytic oxidation system and a high-efficiency denitrification tower.
Preferably, the water inlet of the bag filter is a sewage inlet, the water outlet of the bag filter is connected with the water inlet of an electrochemical system, the water outlet of the electrochemical system is connected with the water inlet of a coagulation tank, the water outlet of the coagulation tank is connected with the water inlet of a sedimentation tank, the water outlet of the sedimentation tank is connected with the water inlet of a water outlet tank, the water outlet of the water outlet tank is connected with the water inlet of a denitrification system, the water outlet of the denitrification system is connected with a denitrification system through a return pipe, the water outlet of the nitrification system is connected with the water inlet of an ultrafiltration membrane system, the ultrafiltration membrane system is connected with the denitrification system through a return pipe, the water outlet of the ultrafiltration membrane system is connected with the water inlet of a nanofiltration system, and the concentrated water outlet of the nanofiltration system is sequentially connected with an electrocatalytic oxidation system and a high-efficiency denitrification tower, and a clear water outlet of the high-efficiency denitrification tower and a clear water outlet of the nanofiltration system are connected with the clear water tank.
Preferably, the sludge discharge ports of the sedimentation tank and the nitrification system are connected with a sludge treatment system, and the sludge treatment system comprises a sludge storage tank and a filter press; the high-efficiency denitrification tower comprises a high-efficiency denitrification tower A and a high-efficiency denitrification tower B.
Preferably, the electrochemical system adopts NS-tin dioxide as an oxidation desalting electrode material and adopts aluminum hydroxide as an adsorption desalting electrode material.
Preferably, the ultrafiltration membrane system consists of an external membrane bioreactor, the filtration membrane adopted by the external membrane bioreactor is a cross-flow tubular ultrafiltration membrane, each ultrafiltration loop is provided with a circulating pump, and the sludge concentration in the external membrane bioreactor is 15-30 g/L; the bioreactor and the membrane separation device unit in the external membrane bioreactor are relatively independent.
Preferably, the nanofiltration system consists of nanofiltration membranes and is used for nanofiltration treatment; the nanofiltration treatment adopts single-stage nanofiltration water outlet, and the water outlet COD value is less than 100 mg/L.
Preferably, the electrode material used for electrocatalytic oxidation of the electrocatalytic oxidation system is a GR metal oxide synthetic electrode, and the electrode structure is a grid-type continuous baffling structure.
Compared with the prior art, the invention has the following beneficial effects:
1. the process and the device of the invention have mature technology and reliable operation, and meet the requirement of treating effluent; the salt removal rate in the landfill leachate wastewater is 70-9More than 0 percent; the extension of sludge age and the removal of organic pollutants by high-concentration microorganisms are greatly improved; high total nitrogen removal efficiency and denitrification load up to 1 kg.N/m 3 D, more than five times of the traditional biochemical process.
2. The process and the device of the invention have convenient operation management and flexible operation, have corresponding impact resistance and strain capacity to the change of the water inlet quantity and the water quality, and have countermeasures to the seasonal change of the percolate.
3. The process and the device are designed economically and reasonably, and the capital investment and the operation management cost are saved on the premise of meeting the treatment requirement; the volume required by the biochemical pool of the external membrane bioreactor is only about 50-70% of that of the internal membrane bioreactor, so that the investment and the floor area of the biochemical pool are greatly saved; nanofiltration concentrated solution does not have the accumulation of monovalent salinity, and the concentrated solution recharge processing can not cause the accumulation of system salinity, is favorable to the continuous stable operation of system, saves artifical maintenance cost.
4. The invention has high automation control degree in the process and reduces the labor intensity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of an apparatus of the present invention;
FIG. 2 is a schematic diagram of an external membrane bioreactor;
FIG. 3 shows the filtration mode of the external ultrafiltration membrane.
Illustration of the drawings: 1. a bag filter; 2. an electrochemical system; 3. a coagulation tank; 4. a sedimentation tank; 5. a water outlet pool; 6. a denitrification system; 7. a nitrification system; 8. an ultrafiltration membrane system; 9. an ultrafiltration water production tank; 10. a nanofiltration system; 11. a clear liquid pool; 12. a sludge treatment system; 101. an electrocatalytic oxidation system; 102. a high-efficiency denitrification tower A; 103. and (4) a high-efficiency denitrification tower B.
Detailed Description
In order to facilitate an understanding of the invention, reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings, and the scope of the invention is not limited to the following specific embodiments.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1:
a process for treating waste water mixed by landfill leachate and DTRO concentrated solution comprises the following steps (as shown in figure 1):
(1) removing solid pollutants: filtering the mixed wastewater of the landfill leachate and the DTRO concentrated solution by using a bag filter 1 to remove solid pollutants to obtain sewage;
(2) desalting: desalting the sewage through an electrochemical system 2, including oxidation desalting and electrostatic adsorption desalting;
(3) biodegradation: the sewage obtained by desalting treatment enters a water outlet tank 5 after coagulation and precipitation (respectively performed in a coagulation tank 3 and a precipitation tank 4), then is sequentially treated by a denitrification system 6 and a nitrification system 7 to primarily remove COD, BOD and NH3-N, and microorganisms are intercepted by an MBR (membrane bioreactor) provided with an ultrafiltration membrane to obtain mixed liquor; controlling the sludge concentration in the MBR membrane bioreactor to be 10-30 g/L;
(4) and (3) ultrafiltration membrane treatment: a mixed liquid circulating pump is adopted to enable the mixed liquid to pass through an external membrane bioreactor, the sludge is intercepted, the discharged water is discharged to an ultrafiltration production water tank 9, and the sludge flows back to a denitrification system; the filter membrane adopted by the external membrane bioreactor is a cross-flow tubular ultrafiltration membrane, each ultrafiltration loop is provided with a circulating pump, and the sludge concentration in the external membrane bioreactor is 15-30 g/L; the bioreactor and the membrane separation device unit in the external membrane bioreactor are relatively independent; the MBR membrane bioreactor provided with the ultrafiltration membrane and the external membrane bioreactor jointly form an ultrafiltration membrane system 8;
(5) deep treatment: the outlet water of the external membrane bioreactor is subjected to nanofiltration through a nanofiltration membrane of a nanofiltration system 10, so that small molecular salt is discharged along with the outlet water to obtain clear liquid and nanofiltration concentrated solution; storing the clear liquid in a clear liquid pool 11 for discharging;
(6) further processing the nano filtrate: the nanofiltration concentrated solution is further treated by an electrocatalytic oxidation system 101 to remove COD and ammonia nitrogen, and is denitrified by a high-efficiency denitrification tower (comprising a high-efficiency denitrification tower A102 and a high-efficiency denitrification tower B103) to obtain clear solution, and the clear solution is stored in a clear solution tank for discharging 11.
Specifically, each process step is described in detail below.
Electrochemical desalination
By adopting the novel electrode material, the NS-tin dioxide has higher oxygen evolution potential, can efficiently generate hydroxyl free radicals and ozone with strong oxidation capacity, and shows excellent performance in the aspect of treating organic pollutants in wastewater by electrochemical catalytic oxidation. The electrostatic adsorption technology adopts a capacitor charge and discharge principle, namely, when electricity is applied, anions and cations in water are respectively adsorbed on the surfaces of the positive electrode and the negative electrode due to electrostatic action and form an electric double layer to be removed from the aqueous solution, and when electricity is discharged (electrodes are in short circuit or reverse connection), the anions and the cations are returned to the eluting water from the electric double layers on the surfaces of the positive electrode and the negative electrode to generate concentrated brine, so that the electrodes can be regenerated. Because only direct current is needed in the desalting process, the electrodes can be recycled by short-circuiting or reversely connecting the electrodes, and the method has the advantages of simple device structure, low energy consumption, low operating cost and the like. The desalting by the capacitance method can remove various heavy metal ions, halides, nitrates, phosphates, sulfates and the like of alkali metals and alkaline earth metals in the water. The scheme is to utilize the proprietary technology, the carbon material electrode with excellent double electric layer capacitance property removes the salts in the garbage leachate wastewater, and the removal rate is more than 70-90%.
Electrochemical oxidation desalting process: at different pUnder the condition of H value, in the electrochemical oxidation process, hydrated ions of aluminum are combined with protons in water molecules around the hydrated ions in the hydrolysis process to sequentially form complex ions with different atomic valences, finally a neutral complex is formed, and insoluble aluminum hydroxide precipitate is formed after water is removed. Typical structure is as [ AI 18 (H 2 O) 12 (OH) 48 ] 6 Ten [AI 6 (H 2 O) 12 (OH) 12 ] 6+ . Under different pH conditions, various aluminum hydroxyl complexes in the wastewater form different hydroxide concentration gradients to be removed.
Electrostatic adsorption desalination process:
the existence of hydroxyl groups is the root cause of various adsorption effects of aluminum hydroxide, and the adsorption of anions and organic matters in water by the aluminum hydroxide is carried out through three different action mechanisms.
(1) Adsorption by covalent bonds
Hydrolysis of aluminum hydroxide to a high degree of polymerization [ AI (OH) when the pH of the water is between 7 and 8.7 3 ]Mainly, Zn in the solution at this time 2+ The metal cation or organic matter forms covalent bond with aluminum hydroxide and is removed by chemical adsorption, and the reaction formula can be represented by [ Al (OH) ] 3 ]+M z+ =[Al(OH) 2 (H 2 O) 3 -OM] z-1 +H + The high polymerization degree aluminum hydroxide absorbs certain divalent metal ions to generate covalent compounds formed by low polymerization degree hydrated aluminum hydroxide and divalent metal oxides and hydrogen ions.
(2) Electrostatic adsorption
The hydrolyzed form of the hydroxide of aluminum is controlled depending on the pH, which is<7, the hydrolyzate is low in degree of polymerization [ AI (H) 2 O) 6 ] + 、[AI(OH)(H 2 O) 5 ] + 、[AI(OH) 2 (H 2 O) 4 ] + . The lower the pH, the more charged, and thus the selective electrostatic adsorption of negatively charged anionic Cl in water - . Due to Cl in water - The concentration is high near the anode and the anode water is acidic, so Cl is near the anode - Positively charged hydrolysis products of low degree of polymerizationThe substance is adsorbed and partially removed.
The hydrated ion adsorption mechanism of aluminum has three mechanisms, namely covalent bond adsorption and electrostatic adsorption. The adsorption mechanism is different depending on the pH value. The covalent bond adsorption can only remove cations such as inorganic matters and the like in water, has no obvious effect on anion Cl < - >, and the pH value must be controlled between 7 and 8.7. The electrostatic adsorption and the covalent bond adsorption can remove inorganic ions and Cl-ions in water. However, the adsorption desalination is limited and the adsorption desalination alone cannot reduce the high salt content in the raw water below the treatment standard. Therefore, the method also plays a role in a chemical desalting mechanism, which is a problem to be solved by the electrochemical chemical reaction desalting mechanism.
Nitration and denitrification process
Nitrification (aerobic) and denitrification (anoxic) biological treatment are increasingly applied to the treatment of high-concentration organic wastewater, and the biological treatment by nitrification and denitrification can remove COD, BOD and NH by biodegradation 3 -N. When the process is designed, the denitrification area is arranged at the front end of the process, and when denitrification reaction is carried out, organic matters in the raw wastewater can be directly used as an organic carbon source to denitrify nitrate in the mixed liquid containing the nitrate returned from the aerobic reactor into nitrogen; in addition, the alkalinity generated in the denitrification reactor due to the denitrification reaction can enter the aerobic nitrification reactor along with the effluent water, and about half of the alkalinity required to be consumed in the nitrification reaction process is compensated; the aerobic nitrification reaction zone is arranged at the rear end of the process, and can further remove organic matters which are often remained in the denitrification process.
The MBR membrane bioreactor technology adopts ultrafiltration to replace a traditional secondary sedimentation tank, microorganisms are completely intercepted in a biochemical system through the interception effect of an ultrafiltration membrane, the hydraulic retention time and the sludge age are completely separated, the sludge concentration in the biochemical reactor is increased from 3-5 g/L to 10-30 g/L, the volume load of the reactor is increased, the volume of the reactor is greatly reduced, and the sludge age is greatly prolonged.
For nitrifying and denitrifying microorganisms with longer generation period, the membrane biochemical reactor with the biological denitrification function (namely, the biochemical part of the membrane biochemical reactor adopts denitrification and nitrification processes) can completely intercept the microorganisms due to ultrafiltration, so that the sludge age of the microorganisms reaches and far exceeds the time required by the growth of the nitrifying microorganisms, and the microorganisms can be propagated and gathered to reach the concentration of the nitrifying microorganisms required by complete nitrification, and thus, the ammonia nitrogen in the wastewater can be completely nitrified. The same extension of sludge age and high concentration of microorganisms greatly improves the removal of organic contaminants.
External membrane bioreactor
In the external membrane bioreactor, the bioreactor and the membrane unit are relatively independent (as shown in figure 2), and treated water is discharged after passing through the membrane component by a mixed liquid circulating pump; the bioreactor and the membrane separation device have small mutual interference. Currently, an external membrane bioreactor is adopted in landfill leachate treatment, and a cross-flow tubular ultrafiltration membrane is generally adopted as an ultrafiltration membrane. Namely, the circulating pump provides a certain flow velocity (3.5-5 m/s) for the mixed liquid (sludge), so that the mixed liquid forms a turbulent flow state in the tubular membrane, and the sludge is prevented from depositing on the surface of the membrane (as shown in figure 3).
Because the external membrane bioreactor adopts the cross-flow tubular ultrafiltration membrane, each ultrafiltration loop is provided with the circulating pump, and the pump provides a required flow velocity (generally 3.5-5 m/s) along the inner wall of the membrane tube, the activated sludge forms a turbulent flow state in the membrane tube, namely the activated sludge with high flow velocity continuously washes the surface of the membrane, so that a concentration polarization layer is difficult to generate near the surface of the membrane, thereby avoiding the blockage of the sludge in the membrane tube, and the characteristic also enables the ultrafiltration membrane to bear higher sludge concentration, and the engineering example shows that the sludge concentration of the external membrane bioreactor is about 15-30 g/L.
Because the sludge concentration of the external membrane bioreactor is 1.5-2 times of that of the built-in membrane bioreactor, the required volume of the biochemical pool of the external membrane bioreactor only needs about 50-70% of that of the built-in membrane bioreactor, and the investment and the occupied area of the biochemical pool are greatly saved.
4. Deep treatment after biochemistry (nanofiltration membrane)
According to a plurality of engineering cases of percolate treatment, the CODcr of the effluent of the ultrafiltration membrane is generally 500-1000 mg/L, and the MBR membrane reactor has large interception aperture and has no interception effect on salt, so that the effluent can not meet the effluent quality requirement, and further advanced treatment is needed.
The advanced treatment process mainly comprises a membrane treatment system, and the membrane treatment can be divided into reverse osmosis, ultrafiltration, nanofiltration, microfiltration and the like according to the aperture of the membrane. Experiments of applying the relevant membrane technology to percolate treatment show that the COD removal rate of the percolate after biochemical treatment by the ultrafiltration membrane is less than 25%, the COD removal rate of the nanofiltration membrane can reach 50-70%, and the COD removal rate of the reverse osmosis membrane can reach more than 90%.
The nanofiltration membrane and the reverse osmosis membrane both belong to the category of compact membranes, and the separation mechanism of the nanofiltration membrane and the reverse osmosis membrane is also the same. The interception limit of nanofiltration is only a dissolved component with the molecular size of about 1nm, and compared with reverse osmosis, nanofiltration has the greatest advantages that small molecular salt can be discharged along with effluent water, adverse effects caused by salt concentration are avoided, but the removal rate of ammonia nitrogen by nanofiltration is low, the invention meets the standard of control on landfill pollution of household garbage (GB 16889-2008) in Table 2, the total nitrogen concentration is less than 40mg/L, and most of the water quality of single-stage nanofiltration effluent can meet the requirement according to the practical experience of previous engineering. Meanwhile, the nanofiltration concentrated solution does not have the accumulation of monovalent salt, so that the salt accumulation of the system cannot be caused by the recharging treatment of the concentrated solution, and the continuous and stable operation of the system is facilitated.
According to the water outlet requirement of the invention, the COD value is controlled within 100mg/L, and the water outlet index is controlled strictly.
Treatment of nanofiltration concentrates
(1) Electrochemical catalytic oxidation
The mechanism of electro-catalytic degradation of organic substances (COD and ammonia nitrogen) is different along with the change of electrode materials, electrolyte, electrolysis control parameters and the like, and the mechanism of electro-catalytic degradation of organic substances (COD and ammonia nitrogen) is a very complicated problem. The mechanism of electrochemical catalytic degradation of organic matter generally includes the following:
a. electrochemical direct oxidation
Two kinds of metal oxides containing active oxygen can be formed on the surface of the metal oxide electrode in the oxygen evolution potential area, one kind of metal oxide is used for adsorbing hydroxyl radicals, and the other kind of metal oxide is used for forming high-valence metal oxides. The surface oxidation process of the metal anode is divided into three steps:
h in solution 2 O (in an acidic medium) or OH & lt- & gt (in an alkaline medium), and the adsorbed hydroxyl radicals are formed by discharging on the surface of the anode, wherein the process is as follows:
MO x +H 2 O→MO x （OH）+H + +e
MO x +HO¯→MO x （OH）+e
one of the above equations is that the metal oxide reacts with water to form a hydroxide radical adsorbed metal oxide and hydrogen ions and release an electron. One of the following equations is that the metal oxide reacts with the hydroxyl radical to form a hydroxyl radical adsorbed metal oxide and release an electron.
The adsorbed hydroxyl radical reacts with oxygen existing on the anode, and oxygen in the hydroxyl radical is transferred to the metal oxide to form high-valence oxide MO x+1 。
When no organics are present in the solution, the two active oxygens precipitate O2 in the following reaction:
MO x （OH）→0.5O 2 +H + +e
MO x+1 +HO¯→0.5O 2 +MO x
the above formula is that 1mol of the hydroxyl radical-adsorbed metal oxide decomposes into 0.5mol of oxygen and 1mol of hydrogen ions and releases an electron. The following formula 1mol of the higher metal oxide decomposes to generate 0.5mol of oxygen and 1mol of the lower metal oxide.
When organic matter is present in the solution, the reaction of the active oxygen oxidizing the organic matter is as follows:
MO x （OH） y +yR→MO x +yH + +ye+yRO
MO x+1 +R→MO x +RO
the above formula is that 1mol of the oxyhydrogen radical-adsorbing metal oxide reacts with ymol organic to produce 1mol of metal oxide and oxide of ymol hydrogen ion, ymol electron and ymol organic. The following formula 1mol of high valence metal oxide reacts with organic matter to decompose and generate 0.5mol of oxygen and 1mol of low valence metal oxide.
The direct oxidation process of organic matter on the surface of anode includes the first hydroxylation process of one surface of anode to form two kinds of active oxygen. In order to be directly oxidized by the anode, organic matters must migrate from the solution body to the surface of the anode and then be oxidized by active oxygen on the surface of the anode, so that the degradation effect of the organic matters by the transfer matters is greatly influenced. After selecting proper electrode materials and electrocatalysis operation parameters, the direct electrocatalysis degradation speed of the organic matters is basically controlled by the mass transfer step.
b. Electrochemical indirect oxidation
The electrocatalytic indirect oxidation of organic substances destroys organic pollutants by generating strongly oxidizing substances (such as OH & and the like) through electrolysis, and the generation of OH & can be realized by the following ways:
anodic reaction (OH)
2H 2 O-2e→2OH·+2H + (in an acidic Medium)
OH - -e → 2OH (in alkaline medium)
The combined action of the cathode and the anode (OH)
At the cathode: o is 2 +2H + +2e→H 2 O 2 (in an acidic Medium)
O 2 +H 2 O+2e→HO 2 + OH (in alkaline medium)
HO 2 +H 2 O+2e→H 2 O 2 +OH
At the anode, OH is generated under the catalytic action of metal, M red Represents a metal reduced state, M ox Representing the oxidation state of the metal
M red +H 2 O 2 +H + →M ox +OH·+H 2 O (in acidic medium)
M red +H 2 O 2 →M ox +OH·+OH - (in alkaline medium)
HO 2 One of the important oxidizing species, which is produced by a process
2OH·→H 2 O 2
H 2 O 2 -e→HO 2 ·+H +
H 2 O 2 +OH·→HO 2 ·+H 2 O
In the electrocatalysis process, a substance O with strong oxidizing property is also generated 3 . These mechanisms will all coexist in the actual electrocatalytic process and will vary with the anode material, electrolyte, electrocatalytic control parameters.
The electrocatalytic oxidation process depends on electrode materials, however, the determination of the electrode is a very complicated problem, and when there is no clear theoretical guidance, only experiments are designed and the electrode materials are determined according to the experimental effects. According to the existing theory, when organic matters are degraded by electrocatalysis, the lower the electrocatalysis activity of the electrode on oxygen evolution reaction, the better the electrode is, namely the electrode has high oxygen evolution overpotential. The invention selects a GR metal oxide synthetic electrode, and the oxygen evolution overpotential is higher.
The structure of the electrodes also has a significant effect on the electrocatalytic effect. The most common two-dimensional electrodes used in engineering today include both plate and tube electrodes. The invention adopts a grid type continuous baffling structure, can increase the specific electrode area As of the reactor, can pass larger current under a certain current density and has higher production strength.
(2) High-efficiency denitrification tower
The nanofiltration concentrated solution has low salt content, large water quantity base number, long retention time of biochemical process wastewater, easy temperature influence on microbial activity, slow enrichment and difficult film formation, and the denitrification load is maintained at 0.1-0.2 kg.N/m 3 •d。
Based on these two kinds of circumstances, how balanced cost and treatment effect to promote technical stability, make different concentration nitrate nitrogen waste water can both accomplish discharge to reach standard, high-efficient anaerobism denitrogenation technique is through improving traditional biological denitrogenation technique, has realized the breakthrough change of three big modules of biological denitrogenation: specially cultured denitrifying bacteria: through culturing in a bacterial biology laboratory, the stimulation conditions of bacteria such as pH, heavy metal concentration, COD content, toxic substances, salt and the like are changed, the most efficient denitrifying bacteria are screened, and the effect of rapidly adapting to the characteristics of industrial wastewater is achieved. Specific customized porous fillers: by carrying out surface treatment on the porous material, the specific surface area and the surface roughness of the filler are increased, more denitrifying bacteria are attached to the filler per unit area, the retention time of wastewater is further reduced, and nitrate can be quickly converted into nitrogen by the high-density denitrifying bacteria. ③ the nitrogen quick release technology: the flow state and the filler grading in the equipment are optimally designed, so that a smooth exhaust micro-channel is established, the generated nitrogen is promoted to be rapidly discharged from the inside, the dead zone and the invalid space of the reactor are reduced, and the stability and the denitrification efficiency of the reactor are improved.
The high-efficiency anaerobic denitrification technology can well solve the problem that the total nitrogen of the outlet water of the nanofiltration concentrated solution exceeds the standard, so that the total nitrogen of the wastewater stably reaches the standard, is applied in multiple industries in China at present, has the advantages of small occupied area, high total nitrogen removal efficiency and the like, and has the denitrification load of up to 1 kg.N/m 3 D, more than five times of the traditional biochemical process.
By the landfill leachate quality of water after the aforesaid process treatment that utilizes kitchen waste water as carbon source and filtration liquid mixed treatment waste water as table 1 below, for the complicated changeable quality of water of assurance system adaptation filtration liquid, and can bear the impact that the fluctuation of quality of water brought by the at utmost, steady operation carries out certain degree to the design quality of water of intaking and enlargies, makes the system surplus sufficient.
TABLE 1 quality of percolate influent
Under normal conditions of the invention, the percolate and concentrate of the percolate are treated to meet the standard of table 2 in the standard for controlling pollution of domestic refuse landfills (GB 16889-2008), and the main parameters of the standard are as follows:
TABLE 2 percolate and concentrate of percolate effluent quality
Example 2:
an apparatus for the mixed wastewater treatment process of landfill leachate and DTRO concentrated solution of example 1, as shown in FIG. 1, is composed of the following components: the device comprises a bag filter 1, an electrochemical system 2, a coagulation tank 3, a sedimentation tank 4, a water outlet tank 5, a denitrification system 6, a nitrification system 7, an ultrafiltration membrane system 8, an ultrafiltration water production tank 9, a nanofiltration system 10, a clear liquid tank 11, a sludge treatment system 12, an electrocatalytic oxidation system 101, a high-efficiency denitrification tower A102 and a high-efficiency denitrification tower B103.
The water inlet of the bag filter 1 is a sewage inlet, the water outlet of the bag filter 1 is connected with the water inlet of an electrochemical system 2, the water outlet of the electrochemical system 2 is connected with the water inlet of a coagulation tank 3, the water outlet of the coagulation tank 3 is connected with the water inlet of a sedimentation tank 4, the water outlet of the sedimentation tank 4 is connected with the water inlet of a water outlet tank 5, the water outlet of the water outlet tank 5 is connected with the water inlet of a denitrification system 6, the water outlet of the denitrification system 6 is connected with the water inlet of a nitrification system 7, the nitrification system 7 is connected with the denitrification system 6 through a return pipe, the water outlet of the nitrification system 7 is connected with the water inlet of an ultrafiltration production water tank 9, the water outlet of the ultrafiltration production water tank 9 is connected with the water inlet of a nanofiltration system 10, and the concentrated water outlet of the nanofiltration system 10 is sequentially connected with an electrocatalytic oxidation system 101, a nanofiltration system 101, a denitrification system 8 and a denitrification system 6, The device comprises a high-efficiency denitrification tower A102 and a high-efficiency denitrification tower B103, wherein a clear water outlet of the high-efficiency denitrification tower B103 and a clear water outlet of the nanofiltration system 10 are connected with a clear water tank 11.
The sludge discharge ports of the sedimentation tank 4 and the nitrification system 7 are connected with a sludge treatment system 12, and the sludge treatment system 12 comprises a sludge storage tank and a filter press.
The electrochemical system 2 adopts NS-stannic oxide as an oxidation desalting electrode material and adopts aluminum hydroxide as an adsorption desalting electrode material;
the filter membrane adopted by the external membrane bioreactor is a cross-flow tubular ultrafiltration membrane, each ultrafiltration loop is provided with a circulating pump, and the sludge concentration in the external membrane bioreactor is 15-30 g/L; the bioreactor and the membrane separation device unit in the external membrane bioreactor are relatively independent;
the nanofiltration system 10 consists of nanofiltration membranes and carries out nanofiltration treatment; the nanofiltration treatment adopts single-stage nanofiltration effluent, and the COD value of the effluent is less than 100 mg/L;
the electrocatalytic oxidation system 101 adopts a GR metal oxide synthetic electrode as an electrode material for electrocatalytic oxidation, and the electrode structure is a grid type continuous baffling structure.
Claims (7)
1. A waste water treatment process of landfill leachate and DTRO concentrated solution is characterized by comprising the following steps:
s1, removing solid pollutants: filtering the mixed wastewater of the landfill leachate and the DTRO concentrated solution to remove solid pollutants to obtain sewage;
s2, desalting: carrying out oxidative desalination and electrostatic adsorption desalination on the sewage obtained in the step S1; NS-stannic oxide is used as an oxidation desalting electrode material, and aluminum hydroxide is used as an adsorption desalting electrode material;
s3, biodegradation: coagulating and precipitating the sewage obtained in the step S2, and then removing COD, BOD and NH by denitrification and nitrification treatment 3 -N, obtaining a mixed liquor;
s4, ultrafiltration membrane treatment: intercepting the sludge of the mixed liquid obtained in the step S3 by an external membrane bioreactor provided with an ultrafiltration membrane, discharging the discharged water, and refluxing the sludge to a denitrification program; the filter membrane adopted by the external membrane bioreactor is a cross-flow tubular ultrafiltration membrane, each ultrafiltration loop is provided with a circulating pump, and the sludge concentration in the external membrane bioreactor is 15-30 g/L; the bioreactor and the membrane separation device unit in the external membrane bioreactor are relatively independent;
s5, deep processing: performing nanofiltration treatment on the effluent obtained in the step S4 through a nanofiltration membrane to discharge small molecular salt along with the effluent to obtain clear liquid and nanofiltration concentrated solution;
s6, further processing nanofiltration liquid: performing electrocatalytic oxidation on the nanofiltration concentrated solution obtained in the step S5 to further remove COD (chemical oxygen demand) and ammonia nitrogen, and performing denitrification treatment to obtain clear solution; the electrode material used for electrocatalytic oxidation is a GR metal oxide synthetic electrode, and the electrode structure is a grid type continuous baffling structure.
2. The process for treating the waste water of the landfill leachate and the DTRO concentrated solution according to claim 1, wherein the denitrification and the nitrification processes in the step S3 are performed in an MBR (membrane bioreactor) provided with an ultrafiltration membrane, and the sludge concentration in the MBR is 10-30 g/L.
3. The process for wastewater treatment of landfill leachate and DTRO concentrated solution according to any of claims 1-2, wherein in step S1, solid contaminants are removed by filtration using a bag filter; in step S2, carrying out oxidation desalting and electrostatic adsorption desalting by an electrochemical system; in step S3, respectively carrying out coagulation and sedimentation through a coagulation tank and a sedimentation tank, and respectively carrying out nitrification and denitrification treatment through a denitrification system and a nitrification system; s4, forming an ultrafiltration membrane system by the external membrane bioreactor; the nanofiltration membrane in the step S5 forms a nanofiltration membrane system; step S6, carrying out electrocatalytic oxidation through an electrocatalytic oxidation system, and carrying out denitrification treatment in a high-efficiency denitrification tower; storing clear liquid obtained by nanofiltration treatment and denitrification treatment in a clear liquid tank for discharging; the impurities generated by coagulation, sedimentation and nitration are recovered by a sludge treatment system, and the sludge is discharged into a sludge storage tank and is buried after being treated by a filter press.
4. An apparatus for the waste water treatment process of landfill leachate and DTRO concentrate of any one of claims 1-3, characterized by consisting of: the device comprises a bag filter (1), an electrochemical system (2), a coagulation tank (3), a sedimentation tank (4), a water outlet tank (5), a denitrification system (6), a nitrification system (7), an ultrafiltration membrane system (8), an ultrafiltration water production tank (9), a nanofiltration system (10), a clear liquid tank (11), a sludge treatment system (12), an electrocatalytic oxidation system (101) and a high-efficiency denitrification tower.
5. The device for wastewater treatment process of landfill leachate and DTRO concentrate according to claim 4, wherein the water inlet of the bag filter (1) is a sewage inlet, the water outlet of the bag filter (1) is connected to the water inlet of the electrochemical system (2), the water outlet of the electrochemical system (2) is connected to the water inlet of the coagulation tank (3), the water outlet of the coagulation tank (3) is connected to the water inlet of the sedimentation tank (4), the water outlet of the sedimentation tank (4) is connected to the water inlet of the water outlet tank (5), the water outlet of the water outlet tank (5) is connected to the water inlet of the denitrification system (6), the water outlet of the denitrification system (6) is connected to the water inlet of the nitrification system (7), the nitrification system (7) is connected to the denitrification system (6) through a return pipe, the water outlet of the nitrification system (7) is connected to the water inlet of the ultrafiltration membrane system (8), the ultrafiltration membrane system (8) is connected with the denitrification system (6) through a return pipe, the water outlet of the ultrafiltration membrane system (8) is connected with the water inlet of the ultrafiltration water production tank (9), the water outlet of the ultrafiltration water production tank (9) is connected with the water inlet of the nanofiltration system (10), the concentrated water outlet of the nanofiltration system (10) is sequentially connected with the electrocatalytic oxidation system (101) and the high-efficiency denitrification tower, and the clear water outlet of the high-efficiency denitrification tower and the clear water outlet of the nanofiltration system (10) are connected with the clear water tank (11).
6. The apparatus for the wastewater treatment process of landfill leachate and DTRO concentrated solution according to claim 4 or 5, characterized in that the sludge discharge ports of the sedimentation tank (4) and the nitrification system (7) are connected with a sludge treatment system (12), and the sludge treatment system (12) comprises a sludge storage tank and a filter press; the high-efficiency denitrification tower comprises a high-efficiency denitrification tower A (102) and a high-efficiency denitrification tower B (103).
7. The plant for the wastewater treatment process of landfill leachate and DTRO concentrate according to claim 4 or 5, characterized in that the nanofiltration system (10) consists of nanofiltration membranes, performing nanofiltration treatment; the nanofiltration treatment adopts single-stage nanofiltration water outlet, and the water outlet COD value is less than 100 mg/L.
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Cited By (1)
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| CN117285201A (en) * | 2023-11-10 | 2023-12-26 | 广州环投从化环保能源有限公司 | Device and method for treating concentrated water by clean wastewater system and leachate treatment system |
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| CN117285201A (en) * | 2023-11-10 | 2023-12-26 | 广州环投从化环保能源有限公司 | Device and method for treating concentrated water by clean wastewater system and leachate treatment system |
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