CN101891336B - System and method for leachate treatment in sanitary landfill - Google Patents
System and method for leachate treatment in sanitary landfill Download PDFInfo
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Abstract
The invention belongs to the field of recycling economy and water treatment and discloses a system and a method for leachate treatment in a sanitary landfill. The system is formed by sequentially connecting a regulating tank, an upflow anaerobic reaction tank, an anaerobic and aerobic biochemical reaction tank, a secondary sedimentation tank, a coagulation sedimentation tank, an immersion-type ultra-filtration system, a nano-filtration system and an advanced oxidation system. The system is capable of carrying out the overall treatment on waste leachate, achieving the advanced treatment of the waste leachate in the sanitary landfill in a way that the physical treatment, chemical treatment and biological treatment are integrated based on the principle that the contaminants having different particle sizes and properties in the waste leachate are classified and achieving the classification of nearly 90 organic contaminants in the waste leachate, thus the treated effluent can fully meet the requirement for the effluent concentration limit of water pollution according to 'the standard for pollution control on the landfill site of municipal solid waste' (GB16889-2008), the system can operate stably for a long time, and the treatment cost is lower than that according to the secondary disc tube reverse osmosis (DT-RO) process.
Description
Technical field
The present invention relates to the processing of percolate, belong to the circulating water treatment field, particularly relate to a kind of treatment system and method for garbage sanitary filling field percolate.
Background technology
The treatment process that can reach the present percolate emission standard of China is also few, mainly contains following several kinds:
(1) deammoniation tower-UASB-SBR-micro-filtration/ultrafiltration-RO reverse osmosis membrane;
(2) UASB-A/O MBR-NF nanofiltration;
(3) micro-filtration-secondary disc tube reverse osmosis (dt-ro) film (DT-RO);
In the above-mentioned technology (1), adopting the physical chemistry method removal of ammonia and nitrogen can bring a series of problem with deammoniation tower, mainly is to exist deammoniation tower to cause problems such as the secondary pollution of ammonia nitrogen, absorption liquid can't be handled, ammonia nitrogen burning power consumption height; There is the halfway problem of removing in intermittent activated sludge process (SBR) technology for the ammonia nitrogen of removing in the percolate; RO reverse osmosis membrane technology then causes containing in the liquid concentrator of percolate the salt of higher concentration, handles if liquid concentrator is carried out evaporative crystallization, then needs the energy consumption of labor; If the landfill district with liquid concentrator recharges landfill yard then can cause the accumulation of salinity, percolate circulates through on-site after a while; Its water outlet worsens; The influent quality of biochemical system is worsened, and the operating pressure of r-o-raises, can't steady running.
In the technology (2); Though the ammonia nitrogen in the water can effectively be removed through the nitration denitrification process; But because the organism anti-nitration reaction speed in the percolate is less, cause denitrification to carry out slowly, denitrification is incomplete; If do not add the denitrifying carbon source that is easy to biological utilisation, total nitrogen concentration can't reach emission standard.And topmost problem is the macromole organic pollutant in the percolate (wherein being to be difficult to biodegradable organic pollutant greatly) not to be removed in the MBR system; But in the MBR system, accumulate; Cause the larger molecular organics concentration in the system to raise gradually, have influence on the normal and stable operation of biochemical system.In addition, the small organic molecule of bio-refractory (like the small molecules humic acids) can pass through ultra-filtration membrane fully, and these organism are to cause the dirty major cause of blocking up and moving of nf membrane system.Though the nf membrane system can the exclusive segment salinity, because its dirty stifled situation is also more outstanding, clean difficulty, make membrane lifetime shorter, can't steady running, bring big difficulty for the promotion and application of this technology.
In the technology (3), DTRO is the advanced treatment technology that is derived from Germany, in Germany extremely successful application precedent has been arranged.Yet the fact shows; The technology of Germany also is not suitable for the percolate from garbage filling field of China without any classification processing; Especially be not suitable for the percolate of metropolitan high concentration COD and ammonia nitrogen characteristic; Such as: the DTRO treatment process that Beijing refuse landfill is used in earlier stage, just can't continue operation, and have to adopt MBR biochemical process and NF membrane process to handle at last in 3 months as a result.In addition, the liquid concentrator after German DTRO handles all is the way that adopts evaporating, concentrating and crystallizing, makes the thorough detachment system of pollutent and salt, and domestic existing liquid concentrator treatment process is to adopt to recharge the landfill district, and ammonia nitrogen and salt all do not have to remove.Ammonia nitrogen has the obvious suppression effect to anaerobion; And salt more can cause the percolate salinity accumulation in the landfill yard; Therefore, it is the process that artificially landfill percolate water quality is worsened that the dense water of r-o-recharges, and finally reacts on expensive treatment system; Cause the reverse osmotic pressure after for some time sharply to increase, effluent quality worsens.
Therefore; How the garbage sanitary filling field percolate without refuse classification is handled; Making processing back water outlet reach the requirement that among " refuse landfill pollutent control criterion " GB16889-2008 the water pollutant emission concentration is limited, is a urgent problem.
Summary of the invention
Based on above-mentioned existing in prior technology problem; The embodiment of the invention provides a kind of treatment system and method for garbage sanitary filling field percolate; Realize that biochemical treatment combines with membrane filtration technique; The percolate that can form the rubbish of non-classified is effectively handled, and makes processing back water outlet reach emission standard.
The objective of the invention is to realize through following technical proposals:
The embodiment of the invention provides a kind of treatment system of garbage sanitary filling field percolate, and this system comprises:
Equalizing tank, flow lifting type anaerobic reation pool, anoxic and aerobic biochemical reaction tank, second pond, coagulative precipitation tank, immersion ultrafiltration system and nanofiltration system;
Described equalizing tank is connected with nanofiltration system with aerobic biochemical reaction tank, second pond, coagulative precipitation tank, immersion ultrafiltration system with flow lifting type anaerobic reation pool, anoxic successively, and the water outlet of said nanofiltration system is as water port; Wherein, be provided with submersible agitator in the said equalizing tank; Be provided with whipping appts, aerating apparatus and reflux pump in said anoxic and the aerobic biochemical reaction tank; Be provided with coagulating agent and coagulant aids input port in the said coagulative precipitation tank; Be provided with the UW utility appliance in the said advanced oxidation system.
The embodiment of the invention also provides a kind of treatment process of garbage sanitary filling field percolate, and this method comprises:
Regulate and handle: institute is handled the garbage sanitary filling field percolate mix, make the Pollutant levels in the percolate after mixing even, the water outlet after adjusting is handled is carried out anaerobic biochemical reaction and is handled;
Anaerobic biochemical reaction is handled: carry out anaerobic biochemical reaction and handle regulating water outlet after handling, part macromolecule organic in the water is decomposed into the organism of lower molecular weight, anoxic and aerobic biochemical processing are carried out in the water outlet after anaerobic biochemical reaction is handled;
Anoxic and aerobic biochemical are handled: anoxic, aerobic and biochemical treatment are carried out in the water outlet after anaerobic biochemical reaction is handled successively; Remove the ammonia nitrogen in high density in the percolate; At a certain temperature, through the cultivation of nitration denitrification bacterium, guarantee parameters such as the residence time and reflux ratio; Remove the ammonia nitrogen in the water, the water outlet after anoxic and the aerobic biochemical processing is carried out carrying out the coagulating sedimentation processing after the secondary sedimentation;
Coagulating sedimentation is handled: carry out coagulating treatment to above-mentioned earlier through the water outlet after the secondary sedimentation; In the coagulating treatment process; The pH value of regulating treating water is 5.2～5.5, dosing coagulant and coagulant aids; Precipitate after the coagulating treatment, remove most of humic acids in the percolate, the water outlet after coagulating sedimentation is handled is carried out ultra-filtration filters and is handled;
Ultra-filtration filters is handled: hollow-fibre membrane or board-like film in the submerged ultrafiltration filtering system are passed through in the water outlet after coagulating sedimentation is handled; Carry out carrying out pre-treatment before ultra-filtration filters is handled in the entering nanofiltration system; Not removed macromole organic pollutant in the water is isolated from system; Be enriched in the ultra-filtration membrane membrane cisterna, prevent its enrichment in biochemical system, ultra-filtration filters is handled the back water outlet carry out the nanofiltration filtration treatment;
Nanofiltration filtration treatment: the water outlet after the nanofiltration filtration treatment is got into nanofiltration system carry out the nanofiltration filtration treatment; Through the nanofiltration filtration not removed residue humic acids and partial organic substances in the water are separated removal; Liquid concentrator after nanofiltration is filtered effluxes to be handled, and the water outlet after nanofiltration is filtered is directly discharged reuse as water up to standard.
Technical scheme through the invention described above embodiment provides can be found out; In the embodiment of the invention through equalizing tank, flow lifting type anaerobic reation pool, anoxic and aerobic biochemical reaction tank, second pond, coagulative precipitation tank, immersion ultrafiltration system and nanofiltration system are connected and composed treatment system successively; Can physics, the mode that organically combines of chemistry and bioremediation handles the garbage sanitary filling field percolate; Realized to the organism of handling each stage different molecular structures and molecular weight; The colloidalmaterial of different-grain diameter and PM for particulate matter; Realize pointed processing; Effectively improved the garbage sanitary filling field percolate,, made water outlet reach among " refuse landfill pollutent control criterion " GB16889-2008 requirement the restriction of water pollutant emission concentration particularly to treatment effect without the sanitary filling field percolate of refuse classification.Particularly in the middle of Biochemistry Reaction System and immersion ultrafiltration system, increased coagulative precipitation tank; With to humic acids, larger molecular organics and specific coagulating sedimentation medicament of colloidal and addition method in the percolate; Compared with prior art; Solved many difficult problems and disadvantage in the conventional garbage percolate treating process, can make system be able to the operation of stability and high efficiency ground.
Description of drawings
The treatment system each several part that Fig. 1 provides for the embodiment of the invention 1 connects synoptic diagram;
The process flow figure that Fig. 2 provides for the embodiment of the invention 2;
Each label is respectively among Fig. 1: 1, equalizing tank; 2, flow lifting type anaerobic reation pool (UASB); 3, anoxic and aerobic biochemical reaction tank; 4, second pond; 5, coagulative precipitation tank; 6, immersion ultrafiltration system; 7, nanofiltration system; 8, advanced oxidation system.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
Embodiment 1
Present embodiment 1 provides a kind of treatment system of garbage sanitary filling field percolate, and is as shown in Figure 1, and this system comprises:
Equalizing tank, flow lifting type anaerobic reation pool, anoxic and aerobic biochemical reaction tank, second pond, coagulative precipitation tank, immersion ultrafiltration system and nanofiltration system;
Described equalizing tank is connected with nanofiltration system with aerobic biochemical reaction tank, second pond, coagulative precipitation tank, immersion ultrafiltration system with flow lifting type anaerobic reation pool, anoxic successively, and the water outlet of said nanofiltration system is as water port; Wherein, be provided with submersible agitator in the said equalizing tank; Be provided with whipping appts, aerating apparatus and reflux pump in said anoxic and the aerobic biochemical reaction tank; Be provided with coagulating agent and coagulant aids input port in the said coagulative precipitation tank; Be provided with the UW utility appliance in the said advanced oxidation system.
The treatment system of above-mentioned garbage sanitary filling field percolate has compared with prior art increased the coagulating sedimentation pool process and has been directed against humic acids, larger molecular organics and specific coagulating sedimentation medicament of colloidal and addition method in the percolate in the middle of Biochemistry Reaction System and immersion ultrafiltration system.This technology has solved many difficult problems and the disadvantage in the garbage leachate treatment process, thereby makes system be able to the operation of stability and high efficiency ground.
In the said system advanced oxidation system can also be set; This advanced oxidation system is connected between the concentrated solution outlet and anoxic and aerobic biochemical reaction tank of said nanofiltration system by the road, the concentrated solution outlet that makes nanofiltration system by the road with said advanced oxidation system tieback to anoxic and aerobic biochemical reaction tank.This advanced oxidation treatment unit is provided with the dosing mouth that is used to add the Fenton oxidising agent, and said dosing mouth and advanced oxidation treatment unit internal communication are provided with the UW supplementary unit in the said advanced oxidation treatment unit.
Immersion ultrafiltration system in the said system is formed by connecting membrane cisterna, polysulfone hollow fiber ultrafiltration membrane system, aerating system, suction pump, chemical cleaning system, instrument and valve line; Be provided with the required perforated pipe of aeration, ultra-filtration membrane film silk, rising pipe successively by putting in order from top to bottom in the said membrane cisterna.Wherein, hollow-fibre membrane can adopt the hollow-fibre membrane that the PVDF material is processed.The immersion ultrafiltration system also can adopt existing immersion ultrafiltration system.
Nanofiltration system in the said system is formed by connecting intake pump, HPP, recycle pump, film framework, nanofiltration membrane component, backwashing pump, medicine system, chemical cleaning system, instrument and valve line; Said nanofiltration membrane component is arranged in the film framework, comprises rolling nf membrane and pressure-bearing putamina.Nanofiltration system also can adopt existing nanofiltration system.
Anoxic is separated setting with the aerobic biochemical reaction tank with the immersion ultrafiltration system in the said system; And between is connected with coagulative precipitation tank through second pond; Water outlet after making anoxic and aerobic biochemical reaction tank handle is carried out the coagulating sedimentation processing through second pond secondary sedimentation and coagulative precipitation tank; Through in coagulating sedimentation is handled, adding coagulating agent the hardly degraded organic substance humic acids is effectively removed; Water outlet after coagulating sedimentation is handled gets into again to be carried out ultra-filtration filters and handles in the immersion ultrafiltration system, also reduced the pressure of ultrafiltration system.
The treatment system of present embodiment; Organically combine by equalizing tank, flow lifting type anaerobic reation pool, anoxic and aerobic biochemical reaction tank, second pond, coagulative precipitation tank, immersion ultrafiltration system and nanofiltration system; Can realize with anoxic, aerobic, biochemical treatment, coagulating sedimentation handle, ultra-filtration filters is handled and four treating processess such as nanofiltration processing organically combine the garbage sanitary filling field percolate is handled; Formation has reached the rational Application of physics, chemistry and bioremediation leachate in refuse landfill site has been carried out the requirement that advanced treatment can reach discharging standards.Utilize the treatment system of present embodiment can realize classification processing to nearly 90 kinds of organic pollutants in the percolate; Thereby the water outlet strictness after guaranteeing to handle reaches the water disposal of pollutants concentration limit requirement among " household refuse landfill sites pollution control criterion " GB16889-2008, and system's long-time running is stable, processing cost is lower than secondary disc tube reverse osmosis (dt-ro) membrane process.
Embodiment 2
The embodiment of the invention provides a kind of treatment process of garbage sanitary filling field percolate, and the treatment system that the foregoing description 1 capable of using provides is handled the garbage sanitary filling field percolate, and is as shown in Figure 2, and this method comprises:
Regulate and handle: institute is handled the garbage sanitary filling field percolate mix, make the Pollutant levels in the percolate after mixing even, the water outlet after adjusting is handled is carried out anaerobic biochemical reaction and is handled;
Anaerobic biochemical reaction is handled: carry out anaerobic biochemical reaction and handle regulating water outlet after handling, part macromolecule organic in the water is decomposed into the organism of lower molecular weight, anoxic and aerobic biochemical processing are carried out in the water outlet after anaerobic biochemical reaction is handled;
Anoxic and aerobic biochemical are handled: anoxic, aerobic and biochemical treatment are carried out in the water outlet after anaerobic biochemical reaction is handled successively; Remove the ammonia nitrogen in high density in the percolate; Specifically be to be controlled at more than 20 ℃ the water temperature; Making the anaerobic pond residence time is 48～60 hours, and the Aerobic Pond residence time is 84～96 hours, and reflux ratio is 300～500%; The ammonia nitrogen in the water is removed in cultivation through the nitration denitrification bacterium basically, and the water outlet after anoxic and the aerobic biochemical processing is carried out carrying out the coagulating sedimentation processing after the secondary sedimentation;
Coagulating sedimentation is handled: carry out coagulating treatment to above-mentioned earlier through the water outlet after the secondary sedimentation; In the coagulating treatment process; The pH value of regulating treating water is 5.2～5.5, dosing coagulant and coagulant aids; Precipitate after the coagulating treatment, remove most of humic acids in the percolate, the water outlet after coagulating sedimentation is handled is carried out ultra-filtration filters and is handled;
The coagulating agent that above-mentioned coagulating sedimentation adds in handling can adopt Poly aluminum Chloride (PAC) and calcium chloride powder; Wherein, The dosage of Poly aluminum Chloride (PAC) is for adding 100～300mg in corresponding every liter of percolate, and the dosage of calcium chloride powder is that 75: 1 ratio adds for the mass ratio in Poly aluminum Chloride (PAC) and calcium chloride powder, and order of adding adds Poly aluminum Chloride (PAC) for elder generation in percolate; After add the calcium chloride powder, the ST is 15 minutes; The coagulant aids that adds during coagulating is handled is a SEPIGEL 305.
Ultra-filtration filters is handled: hollow-fibre membrane or board-like film in the submerged ultrafiltration filtering system are passed through in the water outlet after coagulating sedimentation is handled; Carry out carrying out pre-treatment before ultra-filtration filters is handled in the entering nanofiltration system; Not removed macromole organic pollutant in the water is isolated from system; Be enriched in the ultra-filtration membrane membrane cisterna, prevent its enrichment in biochemical system, ultra-filtration filters is handled the back water outlet carry out the nanofiltration filtration treatment;
Nanofiltration filtration treatment: the water outlet after the nanofiltration filtration treatment is got into nanofiltration system carry out the nanofiltration filtration treatment; Through the nanofiltration filtration not removed residue humic acids and partial organic substances in the water are separated removal; Liquid concentrator after nanofiltration is filtered effluxes to be handled, and the water outlet after nanofiltration is filtered is directly discharged reuse as water up to standard.
Above-mentioned treatment process also comprises the advanced oxidation processing: the liquid concentrator that effluxes after the nanofiltration filtration treatment is carried out advanced oxidation through Fenton reagent and ultrasonic synergistic handle; Organism in the liquid concentrator is decomposed into the small organic molecule that is easy to carry out a biological disposal upon; Improve liquid concentrator water quality; And the liquid concentrator after advanced oxidation is handled is back to anoxic and carries out anoxic and aerobic biochemical processing with the aerobic biochemical pond; To denitrification process available organic carbon source is provided simultaneously, it is low that the mode of this supplementary carbon source is compared artificial supplementation carbon source cost.
The reaction times of the Fenton reagent during above-mentioned advanced oxidation is handled is 30 minutes; PH value in reaction is 4.0; In reactor drum, adding ferrous sulfate and ydrogen peroxide 50 during processing, be 40～80mg/L in the dosage of Fe2+ ferrous sulfate, and the dosage of ydrogen peroxide 50 is 200～400mg/L; The operating frequency of UW utility appliance is 0.5MHz, and sound density is 0.1W/ml.
Above-mentioned treatment process organically combines anoxic and aerobic biochemical processing, coagulating sedimentation processing, ultra-filtration filters processing and nanofiltration filtration treatment; Realized the garbage sanitary filling field percolate being handled with the mode that physics, chemistry and bioremediation organically combine; To the organism of handling each stage different molecular structures and molecular weight; The colloidalmaterial of different-grain diameter and PM for particulate matter; Adopt pointed treatment technology, realized effective processing, make water outlet after the processing can reach the requirement of discharging standards the complicated percolate of moity.
Below in conjunction with the treatment system that provides among the embodiment shown in Figure 11, the treating processes of garbage sanitary filling field percolate is described utilizing above-mentioned treatment process.
This treatment system is to consumer waste landfill percolate (being generally the landfill time less than 8 years) when handling; The percolate water inlet at first gets into the equalizing tank of treatment system; Through the diving mixer that is provided with in the equalizing tank; The water quality of percolate is mixed, prevent that the instantaneous concentration of hazardous contaminant is too high, cause influence biochemical system; The former water of percolate through after the equalizing tank adjusting promotes entering flow lifting type anaerobic reation pool (UASB); Carry out anaerobic biochemical reaction; The anaerobic reaction of flow lifting type anaerobic reation pool (UASB) is owing to receive the influence of ammonia nitrogen concentration, and it is removed efficient and is not sure of, but anaerobic sludge is to the degraded of organic pollutant in the percolate; Can improve the water quality of percolate; A part of macromolecule organic is decomposed into the organism of lower molecular weight, and the organism that a part of aerobic biochemical reaction is difficult to degrade is converted into the organism that is easy to the aerobic biochemical reaction, thereby helps the carrying out of follow-up aerobic biochemical reaction; The water outlet of flow lifting type anaerobic reation pool (UASB) gets into anoxic and aerobic biochemical reaction tank (A/O biochemistry pool); Anoxic and aerobic biochemical reaction tank (A/O biochemistry pool) are the preposition reactive system of denitrification; Accomplish the removal to ammonia nitrogen in high density in the percolate and organic pollutant through nitrated, denitrifying process, anoxic pond is provided with mixing agitator in (A pond), to realize uniform anaerobic environment; The nitrogen that can help simultaneously to produce in the denitrification process spreads, and promotes the carrying out of anti-nitration reaction; Aerobic Pond is provided with micro-hole aerator in (O pond), through gas blower aeration in the pond, for aerobic microbiological provides dissolved oxygen, is back to anoxic pond (A pond) through the mud mixture after the nitration reaction through sludge reflux pump simultaneously, realizes denitrification process; The water outlet of anoxic and aerobic biochemical reaction tank (A/O biochemistry pool) gets into second pond, in second pond, realizes mud-water separation, and mud is back to anoxic pond (A pond), and comparatively clarifying water outlet gets into coagulative precipitation tank; Before getting into coagulative precipitation tank, add certain density hydrochloric acid through line mixer, regulate water pH value to 5.2～5.5 (being generally about 5.3), add two kinds of coagulating agent (Poly aluminum Chloride (PAC) (PAC) and calcium chloride (CaCl then
2), both mass ratioes are 75: 1) and a kind of with fixed attention medicament that helps, add Poly aluminum Chloride (PAC) (PAC) earlier, after add calcium chloride (CaCl
2), mass ratio is 75: 1, after stirring fast through 10min; Add coagulant aids cationic polyacrylamide (PAM), get into the settling tank deposition behind the stirring 30min, water outlet directly gets into the immersion ultrafiltration system; The water inlet of immersion ultrafiltration system is that coagulating sedimentation is handled pH value the water outlet 5.2～5.5 between of back without neutralizing treatment, and acid water quality helps avoid the inorganics fouling of nf membrane system, therefore still need not to regulate pH; The immersion ultrafiltration system adopts the hollow-fibre membrane of PVDF material that filtration treatment is carried out in the water outlet of coagulative precipitation tank; Adopt suction pump suction water outlet, stifled for fear of the dirt of film, in the hollow fiber film assembly bottom boring aeration device is set; Drive water body and the disturbance of film silk through air bubble, stifled with the dirt that slows down film; The water outlet of immersion ultrafiltration system enters into nanofiltration system; Nanofiltration system adopts uses comparatively sophisticated rolled membrane module and corollary apparatus; Can realize preferably the filtration of residual organic substances in the water body is removed, finally realize the complete qualified discharge of water outlet (effluxing again after can neutralizing to the nanofiltration water outlet).
The liquid concentrator that nanofiltration system is discharged gets into the advanced oxidation system; In the advanced oxidation treatment system, carrying out advanced oxidation handles; Specifically be in the advanced oxidation treatment system, to add Fenton Fenton reagent (Fenton reagent) and auxiliary 0.5MHz UW; The radical with strong oxidation capacity through Fenton reagent generates is decomposed into medium molecule organism and small organic molecule with larger molecular organics, the anoxic pond (A pond) of effluent recycling to anoxic and aerobic biochemical reaction tank (A/O biochemistry pool).
In addition; Because the running cost of advanced oxidation system is higher; Therefore its domestic application is very limited at present; Usually also can adopt the mode that liquid concentrator is recharged directly liquid concentrator to be recharged the landfill district to landfill yard, and carry out being back to after advanced oxidation is handled the anoxic pond (A pond) of anoxic and aerobic biochemical reaction tank (A/O biochemistry pool) without the advanced oxidation system.
In the above-mentioned treatment process, it is the novel method of comprehensive treating process percolate that biochemical process is combined with membrane technique, and it mainly is based on the principle that the composition of percolate is classified and disposed.Progressively cultivation and domestication through mikrobe; Biodegradable organic and ammonia nitrogen treatment stage of making through anaerobic and aerobic are effectively removed; The non-biodegradable macromolecular substance of remainder then effectively filters through membrane technique, thereby guaranteeing that water outlet can be stablized reaches emission standard.And in the middle of Biochemistry Reaction System and immersion ultrafiltration system, increased the coagulating sedimentation pool process, compared with prior art, solved many difficult problems and disadvantage in the conventional garbage percolate treating process, thereby made system be able to the operation of stability and high efficiency ground.
In the aforesaid method; The technology of biochemical process and MBR+NF (RO) combination comprehensive treating process percolate is effective combination of low-cost and high stability; But can strengthen the pretreating effect of biochemical stage through adopting means such as anaerobic-aerobic combination; Can reach the pollutant load that alleviates film and increase means such as coagulating sedimentation, advanced oxidation, and solve and followingly eliminate dense water and recharge the problems brought etc.
In sum; The treatment system of the embodiment of the invention and treatment process can effectively be removed the high-enriched organics in the biochemical refuse landfill percolate; The organism, the ammonia nitrogen in high density that comprise difficult for biological degradation; Make water outlet can reach the requirement of the water pollutant emission concentration restriction among " refuse landfill pollutent control criterion " GB16889-2008 steadily in the long term, it also has following advantage:
(1) physics, chemistry and bioremediation are organically combined; To the organism of handling each stage different molecular structures and molecular weight; The colloidalmaterial of different-grain diameter and PM for particulate matter; Adopt pointed treatment technology, and every kind of treatment technology all is comparatively advanced treatment process, the effective combination between them is based on the complicated moity of percolate furtherd investigate and draws.
(2) in coagulative precipitation tank; PH value to 5.2～about 5.5 are regulated on novelty ground earlier; After added the Poly aluminum Chloride (PAC) (PAC) and the calcium chloride powder of certain proportioning; Coagulation effect to humic acids is good, has slowed down the stifled situation of dirt of nf membrane system widely, makes the long-term stability operation of film system become possibility.
(3) adopt A/O biochemistry pool technology, the ammonia nitrogen in high density in the percolate realized removing fully, be lower than the percolate of 1500mg/L for influent ammonium concentration, if temperature guarantee, can make the water outlet of A/O biochemistry pool can reach standard-required.
(4) kept the higher ammonia nitrogen removal ability of A/O biochemistry pool; Adopt coagulation-settlement process and immersion ultrafiltration system simultaneously; The organism (like protein, superpolymer etc.) that has so just solved macromolecule in the existing A/OMBR system is in the continuous cumulative drawback of biochemistry pool, and original A/O MBR system is because the interception of ultra-filtration membrane, and the larger molecular organics that makes biology be difficult to degrade rests on internal system all the time; Caused the mikrobe disadvantageous effect, simultaneously operation and detection have also been disturbed.
(5) combination of Fenton reagent and UW utility appliance; Can the organism of the difficult for biological degradation in the liquid concentrator be carried out chemical oxidation treatment; With the partial organic substances complete oxidation is water and carbonic acid gas, and perhaps the oxidation operation with intermediate molecular weight is the less organism of molecular weight.In this course; Because the concentration of liquid concentrator is higher; If can't reach the requirement of emission standard after handling, can A pond with the effluent recycling behind the advanced oxidation to A/O biochemistry pool in, these small organic molecules can be used as the organic carbon source of anti-nitration reaction; Participate in anti-nitration reaction, thereby it is finally effectively removed.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (8)
1. the treatment system of a garbage sanitary filling field percolate is characterized in that, this system comprises:
Equalizing tank, flow lifting type anaerobic reation pool, anoxic and aerobic biochemical reaction tank, second pond, coagulative precipitation tank, immersion ultrafiltration system and nanofiltration system;
Described equalizing tank is connected with nanofiltration system with aerobic biochemical reaction tank, second pond, coagulative precipitation tank, immersion ultrafiltration system with flow lifting type anaerobic reation pool, anoxic successively, and the water outlet of said nanofiltration system is as water port; Wherein, be provided with submersible agitator in the said equalizing tank; Be provided with whipping appts, aerating apparatus and reflux pump in said anoxic and the aerobic biochemical reaction tank; Be provided with coagulating agent and coagulant aids input port in the said coagulative precipitation tank;
Said system also comprises: the advanced oxidation system, the concentrated solution outlet of said nanofiltration system by the road with said advanced oxidation system tieback to said anoxic and aerobic biochemical reaction tank; Be provided with the UW utility appliance in the said advanced oxidation system.
2. the treatment system of garbage sanitary filling field percolate according to claim 1; It is characterized in that; Said advanced oxidation treatment unit is provided with the dosing mouth that is used to add the Fenton oxidising agent; Said dosing mouth and advanced oxidation treatment unit internal communication are provided with the UW supplementary unit in the said advanced oxidation treatment unit.
3. the treatment system of garbage sanitary filling field percolate according to claim 1; It is characterized in that said immersion ultrafiltration system is formed by connecting membrane cisterna, polysulfone hollow fiber ultrafiltration membrane system, aerating system, suction pump, chemical cleaning system, instrument and valve line; Be provided with the required perforated pipe of aeration, ultra-filtration membrane film silk and rising pipe successively by putting in order from top to bottom in the said membrane cisterna.
4. the treatment system of garbage sanitary filling field percolate according to claim 3 is characterized in that, the hollow-fibre membrane of the hollow-fibre membrane of said polysulfone hollow fiber ultrafiltration membrane system for adopting the PVDF material to process.
5. the treatment system of garbage sanitary filling field percolate according to claim 1; It is characterized in that said nanofiltration system is formed by connecting intake pump, HPP, recycle pump, film framework, nanofiltration membrane component, backwashing pump, medicine system, chemical cleaning system, instrument and valve line; Said nanofiltration membrane component is arranged in the film framework, comprises rolling nf membrane and pressure-bearing putamina.
6. the treatment process of a garbage sanitary filling field percolate is characterized in that, this method comprises:
Regulate and handle: institute is handled the garbage sanitary filling field percolate mix, make the Pollutant levels in the percolate after mixing even, the water outlet after adjusting is handled is carried out anaerobic biochemical reaction and is handled;
Anaerobic biochemical reaction is handled: carry out anaerobic biochemical reaction and handle regulating water outlet after handling, part macromolecule organic in the water is decomposed into the organism of lower molecular weight, anoxic and aerobic biochemical processing are carried out in the water outlet after anaerobic biochemical reaction is handled;
Anoxic and aerobic biochemical are handled: anoxic, aerobic and biochemical treatment are carried out in the water outlet after anaerobic biochemical reaction is handled successively; Remove the ammonia nitrogen in high density in the percolate; Make water temperature remain on 20 ℃ during processing, making the anaerobic pond residence time is 48～60 hours, and the Aerobic Pond residence time is 84～96 hours; Reflux ratio is 300～500%, and the water outlet after anoxic and the aerobic biochemical processing is carried out carrying out the coagulating sedimentation processing after the secondary sedimentation;
Coagulating sedimentation is handled: carry out coagulating treatment to above-mentioned earlier through the water outlet after the secondary sedimentation; In the coagulating treatment process; The pH value of regulating treating water is 5.2～5.5, dosing coagulant and coagulant aids; Precipitate after the coagulating treatment, remove most of humic acids in the percolate, the water outlet after coagulating sedimentation is handled is carried out ultra-filtration filters and is handled;
Ultra-filtration filters is handled: hollow-fibre membrane or board-like film in the submerged ultrafiltration filtering system are passed through in the water outlet after coagulating sedimentation is handled; Carry out carrying out pre-treatment before ultra-filtration filters is handled in the entering nanofiltration system; Not removed macromole organic pollutant in the water is isolated from system; Be enriched in the ultra-filtration membrane membrane cisterna, prevent its enrichment in biochemical system, ultra-filtration filters is handled the back water outlet carry out the nanofiltration filtration treatment;
Nanofiltration filtration treatment: the water outlet after the nanofiltration filtration treatment is got into nanofiltration system carry out the nanofiltration filtration treatment; Through the nanofiltration filtration not removed residue humic acids and partial organic substances in the water are separated removal; Liquid concentrator after nanofiltration is filtered effluxes to be handled, and the water outlet after nanofiltration is filtered is directly discharged reuse as water up to standard;
Said method also comprises:
Advanced oxidation is handled: the liquid concentrator that effluxes after the nanofiltration filtration treatment is carried out advanced oxidation through Fenton reagent and ultrasonic synergistic handle; Organism in the liquid concentrator is decomposed into the small organic molecule that is easy to carry out a biological disposal upon; Improve liquid concentrator water quality; And the liquid concentrator after advanced oxidation is handled is back to anoxic and carries out anoxic with the aerobic biochemical pond and handle with aerobic biochemical, with additional as the denitrifying carbon source of ammonia nitrogen in anoxic and the aerobic biochemical processing.
7. the treatment process of garbage sanitary filling field percolate according to claim 6 is characterized in that,
The reaction times of the Fenton reagent during said advanced oxidation is handled is 30 minutes, and pH value in reaction is 4.0, in reactor drum, adds ferrous sulfate and ydrogen peroxide 50 during processing, with Fe
2+The dosage of meter ferrous sulfate is 40～80mg/L, and the dosage of ydrogen peroxide 50 is 200～400mg/L; The operating frequency of UW utility appliance is 0.5MHz, and sound density is 0.1W/ml.
8. the treatment process of garbage sanitary filling field percolate according to claim 6; It is characterized in that; The coagulating agent that said coagulating sedimentation adds in handling is Poly aluminum Chloride (PAC) and calcium chloride powder, and wherein, the dosage of Poly aluminum Chloride (PAC) is for adding 100～300mg in corresponding every liter of percolate; The dosage of calcium chloride powder is for being that 75: 1 ratio adds in the mass ratio of Poly aluminum Chloride (PAC) and calcium chloride powder; Order of adding is for adding earlier Poly aluminum Chloride (PAC) in percolate, after add the calcium chloride powder, the ST is 15 minutes;
The coagulant aids that adds during said coagulating is handled is a SEPIGEL 305.
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