CN202322568U - Deep treatment system of high-concentration percolate of integrated garbage treatment site - Google Patents
Deep treatment system of high-concentration percolate of integrated garbage treatment site Download PDFInfo
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Abstract
The utility model discloses a deep treatment system of percolate of an integrated garbage treatment site, belonging to the field of industrial wastewater treatment. The deep treatment system comprises an adjusting tank, a coagulative precipitation tank, an upflow type anaerobic sludge bed reaction tank, a primary anaerobic and aerobic membrane bioreactor, an advanced oxidation treatment equipment, a secondary anaerobic and aerobic membrane bioreactor, nanofiltration membrane treatment equipment, an ozone contact tank and an active carbon filtering tower which are connected in sequence. The deep treatment system has the advantages that the garbage percolate can be integrally treated, classified treatment is carried out for different pollutants in the garbage percolate by a mode of combining physical treatment, chemical treatment and biological treatment, deep treatment for the garbage percolate and classified treatment for removing the pollutants such as organic matters, heavy metals and ammonia nitrogen are realized, so that that condition that the treated water meets the requirement for water-pollution discharging concentration limit in pollution control standard of domestic garbage landfills is ensured, the long-time and stable operation of the system is realized, and the treatment cost is lower than that of a secondary disc-tube reverse osmosis membrane process.
Description
Technical Field
The utility model relates to a rubbish integrated processing field landfill leachate's processing belongs to the industrial wastewater treatment field, especially relates to a rubbish integrated processing field leachate's deep processing system.
Background
The treatment processes capable of reaching the current landfill leachate discharge standard in China are few, and mainly comprise the following steps:
(1) deamination-UASB-SBR-microfiltration/ultrafiltration-RO reverse osmosis membrane;
(2) UASB-A/O MBR-NF nanofiltration-RO reverse osmosis membrane;
(3) microfiltration-a second-stage disc-tube reverse osmosis membrane (DT-RO);
in the process (1), a series of problems are caused by adopting a deamination tower physicochemical method to remove ammonia nitrogen, mainly the problems of secondary pollution of ammonia nitrogen caused by the deamination tower, incapability of treating absorption liquid and the like; the intermittent activated sludge process (SBR) has the problem of incomplete removal of ammonia nitrogen in landfill leachate; the roll-type reverse osmosis membrane mainly adopted in the RO reverse osmosis membrane process is very unstable in operation, serious in pollution, frequent in membrane replacement and low in system recovery rate under the operation condition that the concentration of organic pollutants is high.
In the process (2), the most important problem is that the MBR system is greatly influenced by temperature and the quality of inlet water, and the stability of the water quality entering the nanofiltration membrane system cannot be ensured, so that although the nanofiltration membrane system can remove partial salinity and remove partial organic matters, the process mainly aims at landfill leachate with relatively low pollutant and salinity, and the high-concentration organic waste liquid applied to a comprehensive garbage treatment plant cannot ensure that the outlet water still reaches the standard stably.
In the process (3), DTRO is a treatment technique derived from Germany, and has been a successful application precedent in Germany. However, the german technology has been shown to be unsuitable for landfill leachate which is not treated by any classification in china, and is especially unsuitable for leachate with high-concentration COD and ammonia nitrogen characteristics in large cities, such as: the DTRO treatment process used in the early stage of a certain refuse landfill in Beijing cannot be continuously operated after 3 months, and finally, the treatment only needs to be carried out by adopting an MBR biochemical method and an NF membrane process. In addition, the concentrated solution after the Germany DTRO treatment adopts a method of evaporation, concentration and crystallization to ensure that pollutants and salts are thoroughly separated from the system, while the domestic existing concentrated solution treatment method adopts the step of recharging to a landfill area, and ammonia nitrogen and salts are not removed. Ammonia nitrogen has an obvious inhibiting effect on anaerobic microorganisms, and salts can cause the salinity accumulation of leachate in a landfill, so that reverse osmosis concentrated water recharge is a process of artificially deteriorating the quality of the leachate in the landfill and finally reacting on expensive treatment systems, so that the reverse osmosis pressure is increased rapidly after a period of time, and the quality of effluent water is deteriorated.
In summary, even for landfill leachate with lower pollutant concentration in a landfill, the three treatment processes still have more problems, and for high-concentration pollutant landfill leachate generated in a comprehensive landfill, the high-concentration pollutant landfill leachate can not stably meet the standard requirements, even the effluent can not meet the requirements of table 2 and table 3 in the landfill pollutant control standard GB16889-2008 on the limit of the discharge concentration of water pollutants, and for special environment-sensitive areas, if the stable standard of the effluent can not be ensured, the serious pollution problem can be brought.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an advanced treatment system for percolate of a garbage comprehensive treatment field, which can solve the problems that the stability of effluent can not be ensured to reach the standard and more serious pollution can be caused in various processes for treating percolate of a garbage landfill; the method can effectively treat the percolate of the garbage comprehensive treatment plant, so that the treated effluent reaches the corresponding discharge standard, and the pollution is avoided.
The technical scheme adopted for solving the problems is as follows:
the embodiment of the utility model provides an advanced treatment system of rubbish integrated processing field filtration liquid, this system includes:
the system comprises a regulating tank, a coagulating sedimentation tank, an up-flow anaerobic sludge bed reaction tank, a primary anoxic and aerobic membrane bioreactor, advanced oxidation treatment equipment, a secondary anoxic and aerobic membrane bioreactor, nanofiltration membrane treatment equipment, an ozone contact tank and an active carbon filter tower; wherein,
the regulating tank, the upflow anaerobic sludge blanket reaction tank, the primary anoxic and aerobic membrane bioreactor, the advanced oxidation treatment equipment, the secondary anoxic and aerobic membrane bioreactor, the nanofiltration membrane treatment equipment, the ozone contact tank and the activated carbon filter tower are sequentially connected; wherein the regulating tank is provided with a water inlet for introducing percolate, and a perforated aeration pipe is arranged in the regulating tank; the active carbon filter tower is provided with a water outlet; suspended fillers are arranged in the upflow anaerobic sludge blanket reaction tank; the primary anoxic and aerobic membrane bioreactor and the secondary anoxic and aerobic membrane bioreactor are internally provided with a stirring device, an aeration device and a reflux pump; the advanced oxidation treatment equipment is internally provided with an ultraviolet module and an aeration system.
According to the technical scheme provided by the utility model, the adjusting tank, the upflow anaerobic sludge blanket reaction tank, the first-stage anoxic and aerobic membrane bioreactor, the advanced oxidation treatment equipment, the second-stage anoxic and aerobic membrane bioreactor, the nanofiltration membrane treatment equipment, the ozone contact tank and the active carbon filter tower are connected in sequence, can realize the treatment of the leachate of the comprehensive garbage treatment field in a mode of organically combining physical, chemical and biological treatment methods, achieves targeted treatment aiming at organic matters with different molecular structures and molecular weights, colloidal substances and particulate matters with different particle sizes in each stage of treatment, effectively improves the leachate of the comprehensive garbage treatment field, particularly, the treatment effect on the percolate of the comprehensive treatment field without garbage classification can ensure that the effluent meets the requirement of pollutant discharge concentration limitation in the pollutant control Standard for refuse landfill GB 16889-2008.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a processing system according to an embodiment of the present invention;
fig. 2 is a flowchart of a processing method provided by an embodiment of the present invention;
the names of the components corresponding to the reference numerals in fig. 1 are respectively: 1-a regulating reservoir; 2-a coagulating sedimentation tank; 3-upflow anaerobic sludge blanket reaction tank (UASB); 4-first stage anoxic and aerobic membrane bioreactor (AO-MBR tank); 5-advanced oxidation treatment equipment; 6-second grade anoxic and aerobic membrane bioreactor (AO-MBR tank); 7-nanofiltration membrane treatment equipment (NF); 8-an ozone contact tank; 9-an active carbon filter tower; 10-reverse osmosis membrane treatment equipment (RO); 11-a slaked lime mixing and settling tank.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides a landfill integrated treatment field filtration liquid's advanced treatment system can carry out advanced treatment to the landfill filtration liquid in landfill integrated treatment field, avoids landfill filtration liquid to cause the pollution, as shown in figure 1, this system includes: the system comprises a regulating tank, a coagulating sedimentation tank, an up-flow anaerobic sludge bed reaction tank, a primary anoxic and aerobic membrane bioreactor, advanced oxidation treatment equipment, a secondary anoxic and aerobic membrane bioreactor, nanofiltration membrane treatment equipment, an ozone contact tank and an active carbon filter tower;
wherein the regulating tank is connected with an upflow anaerobic sludge blanket reaction tank, a primary anoxic and aerobic membrane bioreactor, an advanced oxidation treatment device, a secondary anoxic and aerobic membrane bioreactor, a nanofiltration membrane treatment device, an ozone contact tank and an active carbon filter tower in sequence; wherein the regulating tank is provided with a water inlet for introducing percolate, and a perforated aeration pipe is arranged in the regulating tank; the active carbon filter tower is provided with a water outlet; suspended fillers are arranged in the upflow anaerobic sludge blanket reaction tank; the primary anoxic and aerobic membrane bioreactor and the secondary anoxic and aerobic membrane bioreactor are internally provided with a stirring device, an aeration device and a reflux pump; the advanced oxidation treatment equipment is internally provided with an ultraviolet module and an aeration system.
The processing system further comprises: the water inlet of the reverse osmosis membrane treatment equipment is connected with the water outlet 1 of the nanofiltration membrane treatment equipment, and the water outlet of the reverse osmosis membrane treatment equipment is connected with the water inlet of the ozone contact tank. The reverse osmosis system is only used as an emergency treatment facility, and if the nanofiltration effluent meets the requirement, the reverse osmosis treatment equipment is not started; if the nanofiltration effluent can not meet the requirements, starting reverse osmosis treatment equipment, and then carrying out filtration treatment on the nanofiltration effluent.
The processing system further comprises: and the slaked lime mixed settling tank is connected between the nanofiltration membrane treatment equipment and the regulating tank through a pipeline. The slaked lime mixed settling tank is used for treating concentrated solution of nanofiltration or reverse osmosis treatment equipment.
The high-grade oxidation treatment equipment in the treatment system is provided with 6 reaction tanks which are sequentially communicated, the first 3 reaction tanks are internally provided with ultraviolet modules, and the ultraviolet modules adopt low-pressure ultraviolet lamp tubes and can provide ultraviolet light with the wavelength of 254 nm; each reaction tank is internally provided with an aeration head, and the aeration head is connected with an ozone generator outside the reaction tank through a pipeline to form an aeration system; the ozone takes pure oxygen as an oxygen source, and the total adding dose is 500-1000 mg/L.
The primary anoxic aerobic membrane bioreactor and the secondary anoxic aerobic membrane bioreactor in the treatment system are both provided with immersed membrane bioreactors, the existing immersed membrane bioreactors can be adopted, and the immersed membrane bioreactors mainly comprise membrane tanks, hollow fiber ultrafiltration membranes or flat ultrafiltration membrane components, aeration devices, suction pumps, chemical cleaning equipment, instrument meters and valve pipelines which are connected to form the immersed membrane bioreactor; perforated pipes, ultrafiltration membrane components and water outlet pipes required by aeration are sequentially arranged in the membrane tank from bottom to top.
The immersed membrane bioreactor is internally provided with a flat plate type ultrafiltration membrane or a hollow fiber ultrafiltration membrane which is made of polyvinylidene fluoride (PVDF) material.
The treatment method of the advanced treatment system for the percolate of the comprehensive garbage treatment field comprises the following steps of:
carrying out advanced treatment on the leachate of the comprehensive garbage disposal plant according to the following steps;
and (3) adjusting: filtering the percolate of the treated comprehensive garbage disposal site by a water conservancy screen, then stirring and mixing air in a regulating tank of the treatment system, and enabling the concentration of pollutants in the percolate to be uniform through stirring;
coagulating sedimentation treatment: coagulating the regulated effluent in a coagulating sedimentation tank, adding a coagulant and a coagulant aid in the coagulating treatment process, and precipitating after the coagulating treatment to remove most suspended particulate matters and charged colloids in the landfill leachate;
anaerobic biochemical reaction treatment: carrying out anaerobic biochemical reaction treatment on the effluent after the coagulating sedimentation treatment in an upflow anaerobic sludge blanket reaction tank, and decomposing part of high molecular organic matters in the water into organic matters with lower molecular weight;
anoxic and aerobic biochemical treatment: allowing the effluent after the anaerobic biochemical reaction treatment to enter a primary anoxic and aerobic membrane bioreactor to be subjected to anoxic, aerobic, biochemical and ultrafiltration membrane filtration treatment in sequence, and removing ammonia nitrogen in the water body through nitrification and denitrification reaction and ultrafiltration membrane filtration under the conditions that the water temperature is 15-35 ℃, the retention time is 8-13 days, and the reflux ratio is 400-600%;
advanced oxidation treatment: carrying out oxidative decomposition treatment on the effluent after the anoxic and aerobic biochemical treatment in advanced oxidation treatment equipment, and carrying out oxidative decomposition on organic matters which are difficult to biodegrade in the water;
secondary anoxic and aerobic biochemical treatment: allowing the effluent after the advanced oxidation treatment to enter a secondary anoxic and aerobic membrane bioreactor to be subjected to anoxic, aerobic, biochemical and ultrafiltration membrane filtration treatment in sequence, and removing ammonia nitrogen in the water body through nitrification and denitrification reaction and ultrafiltration membrane filtration under the conditions that the water temperature is 15-35 ℃, the retention time is 8-13 days, and the reflux ratio is 400-600%;
nanofiltration and filtration treatment: performing nanofiltration filtration treatment on the effluent after the secondary anoxic and aerobic biochemical treatment in nanofiltration membrane treatment equipment, and separating and removing residual humic acid and partial organic matters in the water through nanofiltration filtration;
ozone contact oxidation treatment: carrying out ozone oxidation treatment on the outlet water subjected to nanofiltration filtration treatment in an ozone contact tank;
and (3) contact treatment of activated carbon: and (3) performing adsorption treatment on the effluent after the ozone contact oxidation treatment in an activated carbon filter tower, and discharging the treated effluent serving as standard water or entering a reuse water pool for later use.
The treatment method further comprises reverse osmosis membrane treatment: the reverse osmosis system mainly filters through a reverse osmosis membrane, and is only used as an emergency treatment facility in the process, if the nanofiltration effluent meets the requirement, the reverse osmosis treatment equipment is not started; if the nanofiltration effluent can not meet the requirements, starting reverse osmosis treatment equipment, and then carrying out filtration treatment on the nanofiltration effluent;
further comprising: and (3) precipitation treatment: and (3) precipitating the concentrated solution subjected to nanofiltration filtration in a slaked lime mixed precipitation tank, removing soluble solids (such as heavy metals) in the concentrated solution, and refluxing to an adjusting tank of a treatment system for adjustment treatment.
The advanced oxidation treatment in the treatment method comprises the following steps: performing advanced oxidation treatment on the effluent after anoxic and aerobic biochemical treatment by using ozone and ultraviolet light in a synergistic manner, and decomposing organic pollutants which are difficult to biodegrade in the wastewater by using generated hydroxyl radicals;
the wastewater is sequentially reacted in 6 reaction tanks of the advanced oxidation treatment equipment, the reaction time of each reaction tank is 30 minutes, the reaction pH value is 10.3-11.0, and ozone is added into a reactor during treatment; ozone is added into each reaction tank in the reaction process, pure oxygen is used as an oxygen source, the total adding dose is 500-1000 mg/L, ultraviolet light is added into the first 3 reaction tanks in the reaction process, and the wavelength of the ultraviolet light is 254 nm.
In the coagulating sedimentation treatment of the treatment method, a coagulant which is a polyaluminium chloride solution and has a concentration of 100-500 mg/L is added, then a coagulant aid which is polyacrylamide is added, the adding concentration is 1-3 mg/L, the effluent after coagulation enters a sedimentation tank, and the sedimentation time is 2 hours.
The treatment system can comprehensively treat the landfill leachate, and can carry out classified treatment on different pollutants in the landfill leachate by combining physical, chemical and biological treatment, so that the advanced treatment on the landfill leachate is realized, and the classified treatment of pollutants such as organic matters, heavy metals, ammonia nitrogen and the like is removed, thereby ensuring that the treated effluent strictly meets the requirements of water pollution discharge concentration limit values in table 2 and table 3 in the pollution control standard of domestic refuse landfill GB16889-2008, the system runs stably for a long time, and the treatment cost is lower than that of a secondary disc tube type reverse osmosis membrane process.
The invention will be further explained with reference to the drawings and the specific embodiments.
Example 1
The present embodiment provides a system for treating leachate in a landfill, referring to fig. 1, the system includes: the system comprises a regulating tank (which can comprise matched auxiliary facilities), a coagulating sedimentation tank, an upflow anaerobic sludge blanket reaction tank, a primary anoxic and aerobic membrane bioreactor, advanced oxidation treatment equipment, a secondary anoxic and aerobic membrane bioreactor, nanofiltration membrane treatment equipment (NF), an ozone contact tank, an active carbon filter tower, reverse osmosis membrane treatment equipment (RO) (which can adopt a roll type reverse osmosis membrane system) and a slaked lime mixing and sedimentation tank, wherein the regulating tank is connected with the primary anoxic and aerobic membrane bioreactor;
wherein, the regulating tank and the accessory facilities, the coagulating sedimentation tank, the upflow anaerobic sludge blanket reaction tank, the primary anoxic and aerobic membrane bioreactor, the advanced oxidation treatment equipment, the secondary anoxic and aerobic membrane bioreactor, the nanofiltration membrane treatment equipment, the ozone contact tank and the active carbon filter tower are connected in sequence;
wherein the regulating tank is provided with a water inlet for introducing percolate, and the regulating tank is internally provided with a perforated aeration pipe; a coagulant and coagulant aid inlet is arranged on the coagulating sedimentation tank; the first-stage anoxic and aerobic membrane bioreactor and the second-stage anoxic and aerobic membrane bioreactor are respectively internally provided with a stirring device, an aeration device and a reflux pump; the advanced oxidation treatment equipment is internally provided with an ultraviolet light module and an aeration system, and the aeration system can be composed of a pure titanium metal aerator arranged in the advanced oxidation treatment equipment and an ozone generator arranged outside; the water outlet of the active carbon filter tower is used as a water outlet.
The advanced oxidation treatment equipment in the treatment system is connected between the primary anoxic and aerobic membrane bioreactor and the secondary anoxic and aerobic membrane bioreactor through a pipeline, so that the effluent treated by the primary anoxic and aerobic membrane bioreactor is subjected to advanced oxidation treatment and then enters the secondary anoxic and aerobic membrane bioreactor for treatment. The advanced oxidation treatment equipment is formed by sequentially connecting 6 reaction tanks, wherein ultraviolet module devices can be arranged in the first 3 reaction tanks, pure titanium metal aerators can be arranged in each reaction tank, and each pure titanium metal aerator is connected with an ozone generator outside the reaction tanks to form an aeration system.
The primary anoxic and secondary aerobic membrane bioreactors in the treatment system are respectively provided with an immersed membrane bioreactor, and the immersed membrane bioreactors can be formed by connecting a membrane pool, a flat plate type ultrafiltration membrane component, an aeration system, a suction pump, chemical cleaning equipment, instruments and meters and valve pipelines; and the membrane tank is internally provided with a perforated pipe, an ultrafiltration membrane component and a water outlet pipe which are required by aeration in sequence from bottom to top. Wherein, the flat-plate ultrafiltration membrane component can be made of PVDF material, and the average nominal pore diameter is about 0.1 μm.
The nanofiltration membrane treatment equipment of the treatment system is formed by connecting a water inlet pump, a high-pressure pump, a circulating pump, a membrane frame, a nanofiltration membrane component, a backwashing pump, a dosing system, chemical cleaning equipment, instruments and meters and valve pipelines; the nanofiltration membrane component is arranged in the membrane frame and comprises a rolled nanofiltration membrane and a pressure-bearing membrane shell.
The AO pond and the immersed membrane bioreactor of MBR pond in above-mentioned processing system's second grade oxygen deficiency aerobic membrane bioreactor can separate the setting, pass through the pipe connection between the two for oxygen deficiency and aerobic biochemical reaction pond can debug the operation alone, and immersed membrane bioreactor can place indoor, washs and preserves easier operation, and the temperature is controlled more easily.
The treatment system of the embodiment organically combines units such as a coagulation sedimentation tank, an upflow anaerobic sludge blanket reaction tank, an anoxic and aerobic membrane bioreactor, advanced oxidation treatment equipment, nanofiltration membrane treatment equipment, an ozone contact tank, an activated carbon filter tower and the like, the method can realize biochemical treatment such as anaerobic treatment, anoxic treatment, aerobic treatment and the like on the landfill leachate, and simultaneously carry out chemical treatment of advanced oxidation and ozone oxidation and physical treatment such as coagulating sedimentation, adsorption, ultrafiltration and nanofiltration filtration, so that the reasonable and organic combination of physical, chemical and biological treatment modes is formed, pollutants in the landfill leachate are treated in a classification manner, advanced treatment on the landfill leachate is realized, and the effluent after the landfill leachate is treated completely and strictly reaches the water pollution discharge concentration limit value requirement in the pollution control standard GB16889-2008 of the domestic refuse landfill. And the treatment system runs stably for a long time, and the treatment cost is lower than that of a two-stage disc tube type reverse osmosis membrane process.
Based on the treatment system provided by the above, the advanced treatment of the leachate of the landfill or the incineration plant is performed, as shown in fig. 2, the method includes:
and (3) adjusting: uniformly mixing the treated landfill leachate to ensure that the concentration of pollutants in the leachate after uniform mixing is uniform, and performing coagulating sedimentation treatment on the regulated effluent;
coagulating sedimentation treatment: coagulating the adjusted leachate, adding a coagulant and a coagulant aid in the coagulating treatment process, precipitating after the coagulating treatment, removing most suspended particles in the garbage leachate, and performing anaerobic biochemical treatment on the effluent after the coagulating precipitation treatment;
anaerobic biochemical reaction treatment: carrying out anaerobic biochemical reaction treatment on the regulated effluent, decomposing partial high molecular organic matters in the effluent into organic matters with lower molecular weight, and carrying out anoxic and aerobic biochemical treatment on the effluent after the anaerobic biochemical reaction treatment;
anoxic and aerobic biochemical treatment: the effluent after anaerobic biochemical reaction treatment is subjected to anoxic, aerobic and biochemical treatment in sequence to remove high-concentration ammonia nitrogen in the landfill leachate, and the parameters such as residence time, reflux ratio and the like are ensured by culturing nitrifying denitrifying bacteria at a certain temperature, wherein the specific parameters can be as follows: controlling the temperature of the water body within the range of 15-35 ℃, keeping the retention time for 8-13 days (the anaerobic pool stays for 72 hours, the aerobic pool stays for 120 hours), controlling the reflux ratio to be 400-600%, removing ammonia nitrogen in the water, and simultaneously removing most organic matters through the decomposition of microorganisms;
MBR ultrafiltration filtration treatment: the effluent after the anaerobic aerobic biochemical treatment passes through a hollow fiber or plate-type ultrafiltration membrane in immersed ultrafiltration membrane filtering equipment, so that organic pollutants are further removed;
advanced oxidation treatment: advanced oxidation treatment is carried out on effluent of anoxic and aerobic biochemical treatment, mainly by advanced oxidation treatment technology of ozone and ultraviolet module, hydroxyl free radical with strong oxidizing property is generated to oxidize and decompose organic pollutants which are difficult to biodegrade, so that the organic pollutants are completely decomposed into carbon dioxide and water or into micromolecular organic matters to improve the biodegradability of the organic pollutants;
secondary anoxic and aerobic biochemical treatment: allowing the effluent after the advanced oxidation treatment to enter a secondary anoxic and aerobic membrane bioreactor to be subjected to anoxic, aerobic, biochemical and ultrafiltration membrane filtration treatment in sequence, and removing ammonia nitrogen in the water body through nitrification and denitrification reaction and ultrafiltration membrane filtration under the conditions that the water temperature is 15-35 ℃, the retention time is 8-13 days, and the reflux ratio is 400-600%;
nanofiltration and filtration treatment: the effluent after the secondary anoxic and aerobic biochemical treatment enters nanofiltration membrane treatment equipment for nanofiltration filtration treatment, residual humic acid and partial organic matters which are not removed in the water are separated and removed through nanofiltration filtration, the concentrated solution after the nanofiltration filtration is subjected to slaked lime mixing and precipitation treatment to remove heavy metals and high-valence anion soluble solids in the concentrated solution, then the concentrated solution flows back to a regulating tank or is transported outside, and the effluent after the nanofiltration filtration enters an ozone contact tank;
ozone oxidation treatment: the oxidation capacity of the ozone is very strong, and no secondary pollution exists, so that the ozone deep treatment method is very effective for the advanced treatment of organic matters, and the concentration of organic pollutant can be continuously reduced through the ozone oxidation;
activated carbon adsorption treatment: the granular activated carbon has very obvious adsorption effect on organic matters, particularly aromatic hydrocarbon organic matters with medium molecular weight, organic matters which are difficult to be decomposed by ozone oxidation can be removed by adsorption of the activated carbon, and the harmlessness of effluent can be ensured.
In the advanced oxidation treatment in the method, advanced oxidation treatment equipment is divided into 1-6 reaction tanks, the reaction time of each reaction tank is 30 minutes, the reaction pH value is 10.3-11.0, ozone is added into each reaction tank during treatment, the ozone takes pure oxygen as an oxygen source, and the adding dose is 500-1000 mg/L; the wavelength of the ultraviolet light module system in each reaction tank is 254nm, a low-pressure ultraviolet lamp tube is adopted, and the No. 3-6 reaction tank can not run under the common conditions so as to remove the residual ozone concentration in the wastewater.
The treatment method organically combines the anaerobic, anoxic and aerobic biochemical treatment, the advanced oxidation and ozone oxidation chemical treatment, the coagulation sedimentation treatment, the ultrafiltration filtration treatment and the nanofiltration filtration treatment, realizes the comprehensive treatment of the leachate in the comprehensive garbage treatment field in a mode of organically combining the physical, chemical and biological treatment methods, adopts a targeted treatment mode aiming at treating organic matters with different molecular structures and molecular weights, colloidal substances and particulate matters with different particle sizes in each stage, realizes the effective treatment of the leachate with complex components, and ensures that the treated effluent can meet the requirements of national discharge standards. According to the quality characteristics of the percolate of the refuse disposal sites in different areas, the operation mode can be adjusted correspondingly.
When the treatment system is combined with the treatment method to treat the leachate with high pollutant concentration (COD is less than or equal to 60000mg/L) in the comprehensive garbage treatment field, the influent water of the landfill leachate is filtered by a water conservancy screen mesh and then enters a regulating tank of the system, and the water quality of the leachate is aerated and mixed uniformly by a perforated aeration pipe arranged in the regulating tank, so that the influence on a biochemical system caused by overhigh instantaneous concentration of toxic and harmful pollutants is prevented;
the raw leachate water adjusted by the adjusting tank is lifted to enter a coagulating sedimentation tank, and the coagulating sedimentation tank is mainly used for partially removing suspended particles in the leachate by controlling hydraulic conditions and adding coagulation and coagulant aids;
the effluent after passing through the coagulating sedimentation tank is lifted to an upflow anaerobic sludge blanket reaction tank (UASB), the degradation of organic pollutants in the garbage percolate by anaerobic sludge can improve the water quality of the percolate, a part of high molecular organic matters are decomposed into organic matters with lower molecular weight, and a part of organic matters which are difficult to degrade by aerobic biochemical reaction are converted into organic matters which are easy to carry out the aerobic biochemical reaction, thereby being beneficial to the subsequent aerobic biochemical reaction;
the effluent of an upflow anaerobic sludge blanket reaction tank (UASB) enters a primary anoxic-aerobic membrane bioreactor (AO-MBR), wherein the primary anoxic and aerobic biochemical reaction tank (AO biochemical tank) is a denitrification pre-reaction system, the removal of high-concentration ammonia nitrogen and organic pollutants in the landfill leachate is completed through the processes of nitrification and denitrification, and a mixing stirrer is arranged in the anoxic tank (A tank) to prevent sludge from sinking and simultaneously help nitrogen generated in the denitrification process to diffuse to promote the denitrification reaction; a microporous aerator is arranged in the aerobic tank (O tank), an air blower is used for aerating the aerobic tank to provide dissolved oxygen for aerobic microorganisms, and simultaneously, a sludge-water mixture after nitration is refluxed to the anoxic tank (A tank) through a sludge reflux pump to realize the denitrification process;
the effluent of a primary anoxic and aerobic membrane bioreactor (AO-MBR) enters advanced oxidation treatment equipment, and the advanced oxidation treatment equipment adopts ozone and ultraviolet light for synergistic oxidation treatment, so that the wastewater sequentially passes through 1-6 reaction tanks, and the retention time of each reaction tank is 30 minutes, thereby improving the biodegradability of the wastewater;
the effluent of the advanced oxidation treatment equipment enters a secondary anoxic and aerobic membrane bioreactor (AO-MBR), wherein the total retention time of a secondary anoxic biochemical reaction tank (AO biochemical tank) and an aerobic biochemical reaction tank (AO biochemical tank) is about 3 days, and organic matters generated by advanced oxidation are subjected to deep artificial biochemical treatment mainly through biochemical treatment; the effluent of the secondary anoxic and aerobic membrane bioreactor (AO-MBR) enters nanofiltration membrane treatment equipment, and the nanofiltration membrane treatment equipment can adopt a mature roll-type membrane module and a matching device, so that the residual organic matters in the water body can be better filtered and removed; the effluent water treated by the nanofiltration membrane enters an ozone contact tank, the effluent water of the nanofiltration membrane is treated by adopting an ozone oxidation mode, and if the effluent water of the nanofiltration membrane treatment equipment can reach the discharge standard, the system can not be started; the effluent of the ozone contact tank enters an activated carbon filter tower, organic matters in the wastewater are adsorbed by granular activated carbon so as to finally realize that the effluent completely reaches the standard and is discharged, and if the effluent of the nanofiltration membrane treatment equipment or the ozone contact tank reaches the standard, the unit can not be started;
concentrated solution discharged by the nanofiltration membrane treatment equipment enters a slaked lime mixing and settling tank, and Ca (OH) is added into the slaked lime mixing and settling tank2And (3) mixing and precipitating the solution, removing heavy metals, high-valence anions and other soluble solids in the concentrated solution, and then refluxing to a regulating reservoir or transporting outside.
In addition, because the operation cost of the advanced oxidation treatment equipment is higher, the application in China is greatly limited at present, and the advanced oxidation treatment equipment cannot be replaced for the treatment system and the method, so the system and the method are more suitable for leachate treatment projects of garbage treatment plants in environment-sensitive areas and large cities at present.
The above treatment method is mainly based on the principle of classification treatment of the components of the landfill leachate. The biodegradable organic matters and ammonia nitrogen which are subjected to anaerobic and aerobic treatment stages are effectively removed through gradual culture and domestication of microorganisms, the organic matters which are difficult to biodegrade are decomposed and converted through advanced oxidation treatment equipment, the biodegradability of the organic matters is improved, the organic matters are reprocessed through a biochemical treatment method, and the rest organic matters are effectively filtered through a membrane technology, so that the effluent can stably reach the discharge standard.
In the method, the process for comprehensively treating the landfill leachate by combining the processes of advanced oxidation, coagulating sedimentation, MBR biochemical method, NF (reverse osmosis) (RO) and the like is effective combination of low cost and high stability, the treatment effect in the biochemical stage can be greatly enhanced by adopting anaerobic-aerobic combination, biochemical-advanced oxidation-biochemical regeneration, chemical oxidation-adsorption and other means, and the problems of reducing the pollutant load of the membrane, strictly reaching the effluent standard and the like can be solved by adding supplementary means such as coagulating sedimentation, advanced oxidation and the like.
To sum up, the utility model discloses processing system can realize the comprehensive treatment and stable up to standard to rubbish integrated processing field high pollutant concentration filtration liquid, makes the requirement that the water pollutant discharge concentration restriction of table 2 and table 3 in can reach rubbish landfill pollutant control standard GB16889-2008 steadily for a long time, and it still has following advantage:
(1) the suspended filler is arranged in the upflow anaerobic sludge blanket reaction tank, the rising flow rate of the wastewater is improved by adopting external reflux, the retention time is prolonged, the negative effects of high-concentration ammonia nitrogen and high-concentration soluble solids on the anaerobic reactor are overcome, the anaerobic treatment effect of the monomer is obviously enhanced, and the method plays a great role in the whole process.
(2) By adopting the AO biochemical pool process, the retention time of the wastewater in a biochemical system is prolonged according to the degradation rate of the organic pollutants difficult to degrade, the removal rate of the organic pollutants can be greatly improved, high-efficiency removal of high-concentration ammonia nitrogen in the landfill leachate is realized, and for the landfill leachate with the inlet ammonia nitrogen concentration lower than 2000mg/L, if the temperature is ensured to be more than 15 ℃, the outlet water of the AO biochemical pool can meet the standard requirement.
(3) The coagulating sedimentation process solves the defect that organic matters with large molecular weight (such as protein, high polymer and the like) in the existing AO MBR system are continuously accumulated in a biochemical pool. The original AO MBR system can cause macromolecular organic matters which are difficult to degrade to stay in the system all the time due to the interception of the ultrafiltration membrane, thereby causing adverse effect on microorganisms and simultaneously having great interference on operation and detection.
(4) The advanced oxidation treatment adopts the combination of ozone and ultraviolet light, the ozone is generated by adopting a pure oxygen source, the ultraviolet light adopts low-pressure ultraviolet light with the wavelength of 254nm, and hydroxyl free radicals generated by the advanced oxidation treatment process can oxidize and decompose organic matters which are difficult to be biodegraded in the percolate, and completely oxidize partial organic matters into water and carbon dioxide or decompose organic matters with medium molecular weight into organic matters with small molecular weight. In the process, the reaction time is an important influence factor, and the reaction process can be controlled by increasing the reaction time, so that the treatment system has stronger shock resistance, and a series of subsequent problems caused by biochemical reaction abnormity are avoided.
(5) The nanofiltration membrane treatment equipment is connected with an ozone contact oxidation and active carbon filtration tower, the matching mode is favorable for controlling the effluent index, ozone contact oxidation can be carried out by adopting ozone and advanced oxidation treatment equipment, active carbon adsorption adopts shell particle active carbon, and the adsorption capacity to organic matters is also strong. The combined process of ozone and activated carbon can promote the decomposition of ozone, and the activated carbon has a certain catalytic action in the process; on the other hand, oxidation of organic matter adsorbed on the activated carbon by ozone can also increase the adsorption capacity of the activated carbon. The application of the advanced treatment system strengthens the physicochemical treatment process, and greatly reduces the system risk under the adverse conditions of biochemical system treatment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An advanced treatment system for leachate of a comprehensive garbage disposal site, which is characterized by comprising:
the system comprises a regulating tank, a coagulating sedimentation tank, an up-flow anaerobic sludge bed reaction tank, a primary anoxic and aerobic membrane bioreactor, advanced oxidation treatment equipment, a secondary anoxic and aerobic membrane bioreactor, nanofiltration membrane treatment equipment, an ozone contact tank and an active carbon filter tower; wherein,
the regulating tank, the upflow anaerobic sludge blanket reaction tank, the primary anoxic and aerobic membrane bioreactor, the advanced oxidation treatment equipment, the secondary anoxic and aerobic membrane bioreactor, the nanofiltration membrane treatment equipment, the ozone contact tank and the activated carbon filter tower are sequentially connected; wherein the regulating tank is provided with a water inlet for introducing percolate, and a perforated aeration pipe is arranged in the regulating tank; the active carbon filter tower is provided with a water outlet; suspended fillers are arranged in the upflow anaerobic sludge blanket reaction tank; the primary anoxic and aerobic membrane bioreactor and the secondary anoxic and aerobic membrane bioreactor are internally provided with a stirring device, an aeration device and a reflux pump; the advanced oxidation treatment equipment is internally provided with an ultraviolet module and an aeration system.
2. The advanced treatment system for leachate in a landfill as set forth in claim 1, further comprising: and the water inlet of the reverse osmosis membrane treatment equipment is connected with the water outlet of the nanofiltration membrane treatment equipment, and the water outlet of the reverse osmosis membrane treatment equipment is connected with the water inlet of the ozone contact tank.
3. The advanced treatment system for leachate in a landfill as set forth in claim 1 or 2, wherein the system further comprises: and the hydrated lime mixed settling tank is connected between the nanofiltration membrane treatment equipment and the regulating tank through a pipeline.
4. The advanced treatment system for leachate in a refuse comprehensive treatment plant according to claim 1, wherein the advanced oxidation treatment equipment comprises 6 reaction tanks connected in sequence, the first 3 reaction tanks are provided with ultraviolet light modules, each reaction tank is provided with an aeration head, and the aeration head is connected with an ozone generator outside the reaction tank through a pipeline to form the aeration system.
5. The advanced treatment system for leachate in a refuse comprehensive treatment plant according to claim 1, wherein the primary and secondary anoxic and aerobic membrane bioreactors are each provided with an immersed membrane bioreactor.
6. The advanced treatment system for leachate in a landfill integrated treatment site of claim 5, wherein the submerged membrane bioreactor is provided with a flat plate type ultrafiltration membrane or a hollow fiber ultrafiltration membrane made of polyvinylidene fluoride material.
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