CN100534928C - Short-path deep biological denitrogenation method for city garbage percolate - Google Patents
Short-path deep biological denitrogenation method for city garbage percolate Download PDFInfo
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Abstract
The short-path deep biological denitrogenation method for city garbage percolate belongs to the field of sewage treating technology. The short-path deep biological denitrogenation process is one two stage UASB+A/O process including the reflowing short-path denitrification in the first UASB stage, the methane generating reaction in the second UASB stage and the short-path nitrification in the A/O reactor. The short-path nitrification is realized through regulating water reflux ratio of water based on the C/N ratio of influent water to make the anoxic area in the A/O reactor possess free ammonia concentration of 30-70mg/L to inhibit NO2-N oxidizing bacteria, rather than NH4+-N oxidizing bacteria and oxidize 90-99%of NH4+-N, and controlling the aeration time effectively and accurately with the 'ammonia valley' to maintain stable short-path nitrification. Then, the short-path biological denitrification is completed through treating refluxed water and refluxing sludge.
Description
Technical field
The present invention relates to that a kind of short-cut nitrification and denitrification by stability and high efficiency removes in the high ammonia nitrogen organic waste water can biochemical organism and high ammonia nitrogen method, belong to technical field of biological sewage treatment by using, be applicable to that city domestic refuse percolation liquid and other are such as anaerobic sludge digestion liquid, the contour ammonia nitrogen organic industrial sewage processing of breeding wastewater.
Background technology
The present rubbish annual amount of China reaches 2.4 hundred million tons, and the annual growth of domestic waste was all more than 8%～10% in recent years.China has the rubbish about 90% to handle with landfill method at present, and landfill can produce a large amount of percolates.Percolate is a kind of high ammonia nitrogen organic waste water of complicated component, and the discharge amount of pollution of national percolate accounts for 1.6 ‰ of year total blowdown flow rate, adjusts with chemical oxygen demand and but accounts for 5.27%.It is last one link of sanitary filling field that percolate is handled, and deals with improperly surrounding environment is brought immeasurable pollution and harm, and HUMAN HEALTH is brought threat, also makes sanitary landfill lose original meaning simultaneously.
Since leachate quality and Changing Pattern are understood not enough, municipal sewage treatment technology and design variable are indiscriminately imitated on the percolate treating process blindly, not only processing costs costliness, and water outlet at all can't be up to standard.Now general viewpoint thinks that the percolate of high ammonia nitrogen can suppress microbic activity, so before biochemistry, must adopt physicochemical techniques such as stripping to carry out pre-treatment.This viewpoint of our evidence is not meet the water quality characteristics of percolate and Changing Pattern thereof, is applied to put into practice the error that certainly will cause design and the waste of construction fund.Abandon exploring the leachate treatment technology of economical and efficient, the simple high reverse-osmosis treated technology of cost of use blindly, make that the processing of percolate is hard to carry on because expense is expensive, therefore the removal of nitrogen is the difficult point and the emphasis of advanced treatment of wastewater, has only the bio-denitrification technology of utilization could thoroughly solve this difficult problem.
Biological denitrification process is converted into nitrate nitrogen by nitrification with ammonia nitrogen, by denitrification nitrate nitrogen is converted into nitrogen again and overflows from water.In the nitrated stage, it is by independently two differential responses finishing of bacterium of two classes that ammonia nitrogen is converted to nitrate, at first by nitrococcus (Nitrosomonas) ammonia nitrogen is converted into nitrite (NO
2-N), by nitrifier (Nitrobacter) nitrite is converted into nitrate (NO then
3-N).The final product of nitrification is a nitrate in the traditional biological denitrification process, and denitrification is with NO
3-N is an electron acceptor(EA).For denitrifying bacteria, no matter be that nitrite or nitrate all can be used as final hydrogen acceptor, thereby whole biological denitrification process also can be through NH
4-N → NO
2-N → N
2Such approach is finished, i.e. the short-cut nitrification and denitrification biological denitrification process.Short-cut nitrification and denitrification reduces by two steps than complete nitrification denitrification: save 25% oxygen-supplying amount; Save the required carbon source of 40% denitrification; Reduce the mud growing amount; Reduce the throwing alkali number of nitrifying process; Shorten the reaction times, correspondingly reduced reactor volume 30%～40%.
Compare with the materialization deamination, biological denitrificaion not only expense is low, and secondary pollution useless. and compare the percolate denitrogenation expense that short distance nitration can further reduce high ammonia nitrogen with the complete nitrification denitrogenation, solve its denitrogenation difficult problem at all.But owing to influence NO
2The controlling factor more complicated of-N accumulation, and Nitromonas can be promptly with NO
2-N is converted into NO
3Therefore-N, causes the short distance nitration denitrification process of having realized to revert to the complete nitrification process again.So high ammonia nitrogen leachate shortcut biological denitrification does not make a breakthrough in theory and practice so far.
Existing percolate device is seen accompanying drawing 1, mainly is made up of water tank I, UASB II, A/O reactor IV, second pond V and other auxiliary facility and pipeline.Water tank is connected by the water-in 17 of intake pump 9 with UASB II bottom; UASB II top is provided with rising pipe 29 and is connected with the hypoxia response district of A/O reactor IV, and A/O reactor IV is divided into hypoxia response district and aerobic reactor zone.Aerobic reactor zone is connected by sludge reflux pump 63 with the bottom of second pond V, and second pond V top is provided with outlet valve 84.
Its working process is: utilize intake pump 9 former percolate to be pumped into the water-in 17 of UASB II bottom from water tank I, in UASB II, produce methane reaction from bottom to top, the rising pipe 29 that supernatant liquor is provided with through UASB II top enters the hypoxia response district of A/O reactor IV, carry out denitrification with backflow mixed liquor, enter aerobic reactor zone after hypoxia response is finished and carry out nitration reaction, after nitration reaction finishes, mixed solution is back to the oxygen-starved area by internal circulation pump 92, partially mixed liquid of while enters second pond V and carries out mud-water separation, supernatant liquor after the separation is discharged system by outlet valve, and the mud of bottom carries out recycle by the aerobic reactor zone that sludge reflux pump 63 enters A/O reactor IV.
Existing this technology is the combination of anaerobic reaction and aerobic reaction, denitrification carries out behind anaerobic reaction, this makes the organism anaerobic degradation of this technology and biological denitrificaion constitute irreconcilable contradiction: if anaerobism is abundant, so follow-up anoxic denitrification will be because lacking organic carbon source inefficiency, must add the further denitrogenations of physicochemical techniques such as membrane process; And if the anaerobic treatment weak effect, the organic loading of aerobic reactor is too high, causes a large amount of heterotrophic bacteria growth and breedings, and the growth and breeding of autotrophy nitrifier will be suppressed, and can't finish nitratedly fully, causes system's denitrogenation failure.And high ammonia nitrogen is to microorganism, and particularly the restraining effect of aerobic microbiological makes existing technology must add physico-chemical pretreatment, and ammonia nitrogen degradation after lower level, is carried out a biological disposal upon again.Existing technology is difficult to realize the efficient removal of ammonia nitrogen, more can't realize stable short distance nitration and denitrification.
Existing garbage leachate biological denitrification technology is complete nitrification and denitrification, can not realize the short distance nitration of stability and high efficiency, not only the aerobic aeration amount is big and owing to complete nitrification, require reactor to have bigger useful volume, and its thorough denitrification requirement can biochemical COD/TKN (total Kjeldahl nitrogen)＞4.0.Thereby, the percolate of some refuse landfill, particularly late period percolate COD/TKN much smaller than 4.0, cause the complete nitrification nitric efficiency low.Efficient denitrification just can be realized in stable short distance nitration COD/TKN＞2.4, so adapt to leachate quality by the short distance nitration advanced nitrogen, can save and build and working cost.The complete nitrated of high ammonia nitrogen percolate is the difficult problem of waste water control, and the important breakthrough of percolate processing especially of percolate stability and high efficiency short range biological denitrification, existing domestic and foreign literature does not appear in the newspapers.
Summary of the invention
The objective of the invention is without any physico-chemical pretreatment, realize about 99% high ammonia nitrogen removal by the short distance biological nitration and the denitrification of stability and high efficiency, early stage percolate total nitrogen TN clearance can reach 96%.Handle COD/NH
4 +The late period of-N=2～3 is during percolate, additional carbon not, and total nitrogen TN clearance is 70～80%.Biased on technological deficiency of handling at the conventional garbage percolate and the understanding, short-path deep biological denitrogenation method for city garbage percolate.Organism during denitrification will be intake before the anaerobism at first is consumed as denitrifying carbon source, and anaerobism product methane reaction can thoroughly carry out, thereby is that the adapt circumstance condition is created in follow-up short distance nitration reaction.Because effluent recycling has diluted influent ammonium concentration, need not any physico-chemical pretreatment technology, and make free ammonia FA concentration only suppress ammonia oxidation bacteria (AOB), but do not suppress NOB (NOB), thereby realize stability and high efficiency short distance nitration and denitrification.This invention not only solves the contradiction of existing technology, and have that technical process is simple, the fluctuation that adapts to the leachate quality and the water yield, flexible operation, characteristics simple to operate.Be applied to reality and can significantly reduce construction and working cost, non-secondary pollution.
Know-why:
Percolate COD at first adopts two-stage UASB to produce methane reaction degradation of organic substances significantly by denitrification and anaerobism up to 30000mg/L (municipal effluent COD concentration is 200-500mg/L).Most of organism had reached degraded after percolate entered into aerobic reactor, this has created suitable condition for the autotrophic type nitrifier to the oxidation of ammonia nitrogen, and ammonia nitrogen thoroughly nitrated in the aerobic reactor, diluted the ammonia nitrogen concentration of water inlet when making effluent recycling greatly, restraining effect to microorganism in the system greatly weakens, and makes the thorough short distance nitration of ammonia nitrogen and high efficiency denitrogenation become possibility.Can make full use of former water carbon source and finish denitrification and in one-level UASB, carry out denitrification, reclaim basicity simultaneously and provide inorganic carbon source for the nitration reaction of follow-up Aerobic Pond, the pH (＞8.2) that the system that keeps simultaneously is higher, and then keep higher FA concentration.
By adjusting water outlet reflux ratio and return sludge ratio, the free ammonia FA concentration of aerobic reactor is reduced in the scope of 70-1mg/L from the feed-water end to the water side gradually, thereby only suppress NOB, but do not suppress AOB, the NH of 90-99%
4 +-N is oxidized to nitrite nitrogen NO by nitrococcus
2 --N, the NH of 1-10%
4 +-N is converted into NO
3 --N.Simultaneously, reclaim a large amount of basicity that nitration reaction consumed, keep higher pH, promote and keep short distance nitration by denitrification completely.Moreover effectively controlling aeration time accurately keeps stable short distance nitration by " ammonia paddy " (lower-most point of A/O reactor pH curve), prevents to be converted into complete nitrification.Then reflux by treating water backflow and second pond mud respectively and finish denitrification, promptly denitrifying bacteria utilizes organic carbon source as electron donor, NO
x --N is reduced to nitrogen as electron acceptor(EA) and overflows from percolate and finish short range biological denitrification.
Adopt city garbage percolate short-path deep biological denitrogenation device, it is characterized in that: mainly form by integrated water tank I, one-level UASB II, secondary UASB III, A/O reactor IV, second pond V;
Integrated water tank I is divided into former percolate water tank 1 and treating water water tank 6 two portions, and former percolate water tank 1 is connected by the water-in 17 of intake pump 9 with one-level UASB II bottom; The top for the treatment of water water tank 6 is provided with water discharging valve 11, and treating water water tank 6 middle parts are connected with second pond V by managing 90, and treating water water tank 6 bottoms are connected with the penstock 10 of intake pump 9 by treating water reflux pump 15;
Built-in one-level UASB triphase separator 22 of one-level UASB II and one-level UASB airway 23, airway 23 is connected with one-level UASB alkali lye bottle 26, alkali lye bottle 26 is connected with one-level UASB wet test meter 28, one-level UASB II top is provided with one-level UASB rising pipe 29 and is connected with the water-in 38 of secondary UASB III bottom, one-level UASB rising pipe 29 tops are provided with one-level UASB internal recycle outlet valve 18 and are connected with one-level UASB internal circulation pump 20, and internal circulation pump 20 is connected by the one-level UASB water-in 17 of pipeline with one-level UASB II bottom;
The built-in secondary UASB of secondary UASB III triphase separator 43, secondary UASB airway 44, airway 44 is connected with secondary UASB alkali lye bottle 47, alkali lye bottle 47 is connected with secondary UASB wet test meter 49, secondary UASB top is provided with secondary UASB rising pipe 50 and is connected with A/O reactor IV, rising pipe 50 tops are installed secondary UASB internal recycle outlet valve 39 and are connected with secondary UASB internal circulation pump 41, and internal circulation pump 41 is connected by the water-in 38 of pipeline with secondary UASB bottom;
A/O reactor IV is divided into hypoxia response district and aerobic reactor zone, and agitator 62 is installed in the hypoxia response district, and aerobic reactor zone is connected with air pump 59, and aerobic reactor zone is connected by the bottom of sludge reflux pump 63 with second pond V;
Second pond V top is provided with second pond flowing water Valve 84, and flowing water Valve 84 is connected with treating water water tank 6 by effluent recycling pipe 90.
The invention provides a kind of treatment process that utilizes said apparatus to realize the percolate short range biological denitrification, its step comprises:
A kind of short-path deep biological denitrogenation method for city garbage percolate is characterized in that, is made up of following steps:
1). aerobic nitrification mud is added to A/O reactor IV, and inoculum size makes sludge concentration MLSS=3000-4000mg/L; The percolate of 10～6 times of dilutions is added to raw water box 1, starts intake pump 9, be driven into A/O reactor IV, improve influent load, make A/O reactor IV water inlet COD＜2500mg/L, NH by the percolate that will surmount after pipe 97 will dilute
4 +-N＜300mg/L, A/O reactor IV oxygen-starved area free ammonia FA=30-70mg/L, and by adjusting water outlet reflux ratio and return sludge ratio, the free ammonia FA concentration of A/O reactor IV is reduced in the scope of 70-1mg/L from the feed-water end to the water side gradually, guarantee that simultaneously pH changes lower-most point and occurs at the end of A/O reactor IV;
2). as A/O reactor IV treating water NH
4 +-N＜15mg/L, and NO
2 --N cumulative percentage＞90% is finished the startup of A/O reactor IV short distance nitration;
3). denitrification mud is dosed one-level UASB II, anaerobic grain sludge is dosed secondary UASBIII, start intake pump 9 and treating water reflux pump 15, the treating water that makes former percolate and backflow is by 1: 3-1: 4 flow proportional is mixed into one-level UASB II, start first internal circulation pump 20 simultaneously, water inlet and reflow treatment water load make one-level UASB II water outlet NO
2 --N＜10mg/L promptly finishes short-cut denitrification, NO
2 --N is converted into N
2The discharge system;
4). one-level UASB II water outlet enters secondary UASBIII, when liquid is full of secondary UASBIII, starts second internal circulation pump 41, produces methane reaction, and it is 2500-3500mg/L that adjustment influent load and treating water reflux ratio make secondary UASBIII water outlet COD;
5). secondary UASBIII water outlet enters the oxygen-starved area of A/O reactor IV, start the denitrification that agitator 62 carries out returned sluge, making by control A/O reactor IV influent load can biochemical COD/TKN＞3.0, finish the denitrification of oxygen-starved area, keep A/O reactor IV oxygen-starved area free ammonia FA=30-70mg/L simultaneously; Then mixed solution enters aerobic reactor zone, booster air pump 59 carries out aeration, and by adjusting water outlet reflux ratio and return sludge ratio, the free ammonia FA concentration of A/O reactor IV is reduced in the scope of 70-1mg/L from the feed-water end to the water side gradually, guarantee that pH changes lower-most point and occurs at the end of A/O reactor IV, remove high nitrogen by short distance nitration, treating water NH
4 +-N＜15mg/L, NO
2 --N cumulative percentage is 90%-99%, and short distance nitration and denitrification finish efficiently;
6). after short distance nitration finished, mixed solution entered second pond V and carries out mud-water separation, after mud-water separation finishes, opened sludge reflux pump 63, and (IV oxygen-starved area, return sludge ratio are 50%-100% to the A/O reactor with activity sludge reflux; Second pond V effluent recycling carries out effluent recycling or overflow water outlet to handling water tank 6.
The two-stage UASB+A/O art breading percolate method that the present invention relates to compared with prior art has following advantage:
1) reflow treatment water not only can be finished denitrification, reclaims basicity when realizing denitrogenation, improves the pH of system, and can dilute the water inlet high-concentration ammonia-nitrogen, FA concentration is only suppressed NOB, but do not suppress AOB, thereby keep short distance nitration;
2) secondary UASB removes the most of organism of one-level UASB water outlet by producing methane reaction, because pH is higher, and the part organic carbon is converted into inorganic carbon, basicity improves by a relatively large margin behind the anaerobic reaction simultaneously.The short distance nitration that is generated as the high ammonia nitrogen of follow-up aerobic reactor of organic degraded significantly and basicity has been created suitable matrix and envrionment conditions;
3) anaerobism water outlet residual organic substances is at first as NO in the returned sluge
2 -The degraded of the denitrifying carbon source of-N and anoxic.Thereby the major part in this technology can be removed under anaerobism and anoxybiotic condition by biochemical organism, has not only saved the aeration expense, and partly is utilized as denitrifying carbon source, and another part then is converted into methane or basicity;
4) enter and promptly carry out the nitrated of remaining organic thorough degraded and high ammonia nitrogen behind the aerobic zone.Utilize basicity in the anaerobism water outlet by short distance nitration, high ammonia nitrogen is removed completely, not only saves 25% aeration rate, and saves 40% the required carbon source of denitrification, and this denitrogenation to the percolate that carbon source lacks is most important;
5) in nitrifying process, as controlled variable, as the reference mark, can indicate the ammonia oxidation end point accurately and effectively with the lower-most point of pH value with pH.Thereby, after occurring, the lower-most point of pH value promptly stops aeration, not only can save aeration rate, prevented aeration, and save the aeration expense, and can keep stable short distance nitration and denitrification.
Description of drawings
The existing percolation liquid treating system synoptic diagram of Fig. 1;
" short-path deep biological denitrogenation method for city garbage percolate " treatment system synoptic diagram that Fig. 2 the present invention adopts;
Reference numeral
The integrated water tank of I-, II-one-level UASB, III-secondary UASB, IV-A/O reactor, V-second pond;
The penstock of the penstock of the former percolate water tank of the integrated water tank of I-: 1-, 6-treating water water tank, 7-water absorption tube, 8-inlet valve, 9-intake pump, 10-pump 9,11-flowing water Valve, 12-treating water reverse flow valve, 13-treating water water intaking valve, 14-treating water water inlet pipe, 15-treating water reflux pump, 16-pump 15;
II-one-level UASB:17-one-level UASB water-in, 18-one-level UASB internal recycle valve, 19-one-level UASB internal recycle water inlet pipe, 20-one-level UASB internal circulation pump, 21-one-level UASB internal recycle rising pipe, 22-one-level UASB triphase separator, 23-one-level UASB airway, the clear and coherent valve of 24-one-level UASB gas circuit, 25-one-level UASB biogas delivery pipe, 26-one-level UASB alkali lye bottle, 27-one-level UASB alkali lye bottle and under meter pipe connecting, 28-one-level UASB wet test meter, 29-one-level UASB rising pipe, 30～37-one-level UASB sampling valve;
III-secondary UASB:38-secondary UASB water-in, 39-secondary UASB internal recycle valve, 40-secondary UASB internal recycle water inlet pipe, 41-secondary UASB internal circulation pump, 42-secondary UASB internal recycle rising pipe, 43-secondary UASB triphase separator, 44-secondary UASB airway, the clear and coherent valve of 45-secondary UASB gas circuit, 46-secondary UASB biogas delivery pipe; 47-secondary UASB alkali lye bottle, 48-secondary UASB alkali lye bottle and under meter pipe connecting, 49-secondary UASB wet test meter, 50-secondary UASB rising pipe, 51～58-secondary UASB sampling valve;
IV-A/O reactor: 59-air pump, 60-aeration tube, 61-gas meter, 62-agitator, 63-sludge reflux pump, 64-mud return line, 65～73-artificial atmosphere valve, 74～82-aeration head, 83-aeration tank rising pipe;
The V-second pond: 84-second pond outlet valve, 85～87-sampling valve, 88-pipe core, 89-sludge reflux pump advance mud pipe, 90-effluent recycling pipe, 91-internal recycle water inlet pipe, 92-internal circulation pump, 93-internal recycle rising pipe, 94-water intaking valve, 95-and surmount valve, 96-secondary UASB outlet valve, 97-and surmount pipe.
Embodiment 1 (processing of early stage percolate)
In conjunction with the embodiments, as shown in Figure 2, the operation operation of technology of the present invention:
Experimental water is taken from the equalizing tank of Beijing's refuse landfill, and percolate is aterrimus, thickness, foul smelling, this leachate quality: COD:7000～25000mg/l; BOD
5: 3500～14000mg/l; NH
4 +-N:1250～2450mg/l; SS:2000～4000mg/l; Basicity: 8000～11000mg/l; TP:9～15mg/l; PH:7.2～7.9.Per two days sampling analysis once, the analytical procedure that adopts in the test all is standard methods of State Bureau of Environmental Protection issue.This percolate is typical city domestic refuse percolation liquid, organism and ammonia nitrogen concentration height, but heavy metal content is relatively low.Pilot system is made up of two-stage UASB and A/O pond as shown in Figure 1.The internal diameter of UASB1 is 5cm, highly is 210cm, and useful volume is 4.25L.The internal diameter of UASB2 is 8cm, highly is 200cm, and useful volume is 8.25L.The useful volume in A/O pond is 15L, is divided into ten lattice chambers, and the first lattice chamber is the oxygen-starved area.
Detailed process is as follows:
At first aerobic nitrification mud is added to A/O reactor IV, inoculum size should satisfy sludge concentration MLSS=3000-4000mg/L.According to former leachate quality situation, after 10 times of former water dilutions, join raw water box 1.Valve-off 94,96, Open valve 95,65-73,89 start intake pump 9, air pump 59, agitator 54, return sludge pump 63.Flooding velocity according to 3,4, the gradient of 5L/d improves flooding quantity gradually, the mud quantity of reflux is the 50%-100% of flooding quantity.Should guarantee the COD＜2500mg/L of intaking, NH
4 +-N＜300mg/L.Guarantee A/O reactor IV oxygen-starved area free ammonia FA=30-70mg/L simultaneously, and " ammonia paddy " (lower-most point of pH change curve) occurs at the end of A/O reactor IV.Operation operation under these conditions is as A/O reactor IV water outlet NH
4 +-N＜15mg/L, and NO
2 --N cumulative percentage (NO
2 --N/NO
2 --N+NO
3 --N)＞90%, indicate that the startup of system's short distance nitration finishes, then carry out system combined startup.
Raw water box 1 is filled former percolate, and treating water water tank 6 is filled with system handles water.Open valve 8 and 13, start intake pump 9 and treating water reflux pump 15, the flow of intake pump is 5.5L/d, the flow for the treatment of water reflux pump is 4 times of raw water flow, be 22.0L/d, then the flow of one-level UASB water inlet mixed solution is the 27.5L/d. while, opens valve 18, start the internal recycle that internal circulation pump 20 carries out one-level UASB, circular flow is 24L/d.
Biochemical reaction takes place with the microorganism in the cylinder in this reactor of water inlet mixed solution process from bottom to top of one-level UASB.Short-cut denitrification at first takes place in the water inlet mixed solution in reactor, denitrifying bacteria utilizes the abundant organic carbon source of former percolate with reflow treatment water NO
2 --N is converted into nitrogen.After denitrification finishes, the methanogen among the one-level UASB will partly remain organic-biological and be converted into methane.Nitrogen that produces and methane flowing from bottom to top, the separation through triphase separator 22 enters into alkali lye bottle 26 by airway 23, the CO in alkali lye bottle 26 in the biogas
2Absorbed by alkali lye, and nitrogen and methane are through wet test meter 28 metering back dischargings.By the height sampling analysis of sampling valve 30～37 from reactor, pollutent Changing Pattern is therein studied the Changing Pattern of microorganism simultaneously.Then pass through the separation of triphase separator, supernatant liquor enters into secondary UASB through the rising pipe 29 of one-level UASB.
After one-level UASB processing, its water outlet NO
2 --N almost all is converted into nitrogen.Organism in the former percolate obtains the part degraded by denitrification and product methane reaction.
Open valve 39, start internal circulation pump 41, the mixed solution of one-level UASB water outlet and internal recycle supernatant liquor together enters the bottom water-in of secondary UASB.The flow of internal circulation pump 41 is 100L/d. water inlet mixed solution flowing from bottom to top, simultaneously, contact with anerobe in the reactor, and be methane by producing the organism major part Degradation and Transformation of methane reaction in will intaking.The methane that produces flowing from bottom to top, the separation through triphase separator 43 enters into alkali lye bottle 47 by airway 44, the CO in alkali lye bottle 47 in the biogas
2Absorbed by alkali lye, and methane is through wet test meter 49 metering back dischargings.Changing Pattern in the reactor can obtain by sampling valve 51～58 sampling analysis.Secondary UASB water outlet flow into A/O reactor IV by rising pipe 50 gravity.
Start 62 pairs of mixed solutions of agitator and stir the denitrification of finishing returned sluge.Start the feed-water end that sludge reflux pump 63 is back to the mud of second pond A/O reactor IV.By stirring the denitrification of oxygen-starved area (lattice chamber 1), the NO of returned sluge
x --N is converted into nitrogen.Open air control valve 65～73, the flow of gas meter is adjusted into 400L/h, booster air pump 59 by blast main 60, carries out aeration through the mixed solution in 74～82 pairs of aeration tanks of aeration head.The thorough short distance nitration of high ammonia nitrogen is closed in the oxidation that (2-10 lattice chamber) finishes residual organic substances in the aeration zone.A/O reactor mixed solution enters the pipe core 88 of second pond V by rising pipe 83, and uniform water distribution in second pond then carries out mud-water separation.Open flowing water Valve 84 after the mud-water separation, supernatant liquor enters into treating water water tank 6 by effluent recycling pipe 90.Open valve 11, final outflow water overflows system.
For keeping stable short distance nitration, in operational process, regularly detect A/O reactor IV aerobic zone pH, draw the pH change curve, determine the position that " ammonia paddy " occurs, and the end point of ammonia nitrogen short distance nitration.If (for example occurring in lattice chamber the 6th) appears in " ammonia paddy " in advance,, strengthen the processing load of system with regard to the flow of corresponding raising intake pump 9.Perhaps reduce the air demand of air pump 59, reduce the DO concentration of aerobic zone, make " ammonia paddy " postpone till 9-10 lattice chamber and occur, thereby suppress the growth of NOB (NOB), stop and destroy short distance nitration.If in the end useless of aerobic zone short distance nitration, then can reduce intake pump 9 flows, perhaps improve the air demand of air pump 59.Also can improve the flow of effluent recycling pump 15, increase reflux ratio, reduce the free ammonia FA of system concentration, further improve nitrogen removal rate simultaneously.
Long run test result shows: maximum COD removes that speed is respectively 12.5,8.5Kg COD/m in UAS B1 and UASB2
3D, NO in UASB1
x -The maximum removal rate of-N is 3.0KgNO
x --N/m
3D.The water outlet COD of two-stage UASB is 2000-3000mg/L, and wherein about 50% COD is difficult to biochemistry, and this is nitrated the created favourable condition of high ammonia nitrogen at the A/O reactor.The COD clearance of system is 80%-92%, and water outlet COD is 800-1500mg/l.The NH of former percolate
4 +-N concentration is 1100-2000mg/L, the maximum NH in A/O pond
4 +It is 0.68Kg NH that-N removes speed
4 +-N/m
3D, at 17-30 ℃, NH
4 +The clearance of-N about 99%, NO
2 --N cumulative percentage is 90%-99%.Water outlet NH
4 +-N concentration is lower than 15mg/L.NO in recycling effluent and the second pond returned sluge
x --N, the anoxic section in UASB1 and A/O pond realizes denitrification almost completely respectively, makes system's inorganic nitrogen clearance at 80%-92%.
Denitrification provides competent basicity for nitrated completely, makes to create prerequisite for realizing stable short distance nitration in A/O pond pH＞8.5.The mud of each reactor all is independently in the system, has formed dominant microflora separately, finishes denitrification respectively, produces methane and nitration reaction.Compare with physicochemical techniques such as ammonia stripping, reverse osmosis and traditional omnidistance biological denitrification process, the native system economical and efficient, there is not secondary pollution, remove for the short distance nitration of high ammonia nitrogen in the percolate simultaneously practicable technical parameter is provided, reduce construction and working cost that percolate is handled largely.
Embodiment 2 processing of percolate (late period)
Adopt " two-stage UASB+A/O " system handles city domestic refuse percolation liquid in typical late period, carry out reflow treatment water denitrification in one-level UASB, secondary UASB produces methane reaction, and the A/O reactor carries out NH
4 +The reaction of-N short distance nitration.Organic removal rate=the 50%-70% of system, the water outlet COD=1000～1500mg/L of system.When operating temperature is 17～29 ℃, realized stable NO
2 --N cumulative percentage is the short distance nitration of 90%-99%.Duration of test NH
4 +-N ALR=0.28～the 0.60kgNH that loads
4 +-Nm
-3D
-1, NH
4 +The nitrated rate of-N=90%～100%.As ALR＜0.45kgNH
4 +-Nm
-3D
-1, nitrated rate＞98%, water outlet NH
4 +-N＜15mgL
-1At water inlet COD/NH
4 +-N=2～3 o'clock, inorganic nitrogen TIN clearance=70%～80%.Adopt fluorescence in situ hybridization technique (FISH) that active sludge is detected, the result shows, the NH in the A/O technology active sludge
4 +-N oxidation bacterium (AOB) is about 4% of a total plate count, NO
2 -0.2% of-N oxidation bacterium (NOB) quantity not sufficient bacteria total amount.
Claims (1)
1. a short-path deep biological denitrogenation method for city garbage percolate is characterized in that, is made up of following steps:
1). aerobic nitrification mud is added to A/O reactor (IV), and inoculum size makes sludge concentration MLSS=3000-4000mg/L; The percolate of 10～6 times of dilutions is added to raw water box (1), starts intake pump (9), be driven into A/O reactor (IV), improve influent load, make A/O reactor (IV) water inlet COD＜2500mg/L, NH by the percolate that will surmount after pipe (97) will dilute
4 +-N＜300mg/L, A/O reactor (IV) oxygen-starved area free ammonia FA=30-70mg/L, and by adjusting water outlet reflux ratio and return sludge ratio, the free ammonia FA concentration of A/O reactor (IV) is reduced in the scope of 70-1mg/L from the feed-water end to the water side gradually, guarantee that simultaneously pH changes lower-most point and occurs at the end of A/O reactor (IV);
2). as A/O reactor (IV) treating water NH
4 +-N＜15mg/L, and NO
2 --N cumulative percentage＞90% is finished the startup of A/O reactor (IV) short distance nitration;
3). denitrification mud is dosed one-level UASB (II), anaerobic grain sludge is dosed secondary UASB (III), start intake pump (9) and treating water reflux pump (15), the treating water that makes former percolate and backflow is by 1: 3-1: 4 flow proportional is mixed into one-level UASB (II), start first internal circulation pump (20) simultaneously, water inlet and reflow treatment water load make one-level UASB (II) water outlet NO
2 --N＜10mg/L promptly finishes short-cut denitrification, NO
2 --N is converted into N
2The discharge system;
4). one-level UASB (II) water outlet enters secondary UASB (III), when liquid is full of secondary UASB (III), start second internal circulation pump (41), produce methane reaction, it is 2500-3500mg/L that adjustment influent load and treating water reflux ratio make secondary UASB (III) water outlet COD;
5). secondary UASB (III) water outlet enters the oxygen-starved area of A/O reactor (IV), start the denitrification that agitator (62) carries out returned sluge, making by control A/O reactor (IV) influent load can biochemical COD/TKN＞3.0, finish the denitrification of oxygen-starved area, keep A/O reactor (IV) oxygen-starved area free ammonia FA=30-70mg/L simultaneously; Then mixed solution enters aerobic reactor zone, booster air pump (59) carries out aeration, and by adjusting water outlet reflux ratio and return sludge ratio, the free ammonia FA concentration of A/O reactor (IV) is reduced in the scope of 70-1mg/L from the feed-water end to the water side gradually, guarantee that pH changes lower-most point and occurs at the end of A/O reactor (IV), remove high nitrogen by short distance nitration, treating water NH
4 +-N＜15mg/L, NO
2 --N cumulative percentage is 90%-99%, and short distance nitration and denitrification finish efficiently;
6). after short distance nitration finished, mixed solution entered second pond (V) and carries out mud-water separation, after mud-water separation finishes, opened sludge reflux pump (63), and to A/O reactor (IV) oxygen-starved area, return sludge ratio is 50%-100% with activity sludge reflux; Second pond (V) effluent recycling carries out effluent recycling or overflow water outlet to handling water tank (6).
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