CN101544453A - Dephosphorization and denitrification, mud decrement and phosphorus recovery integrated sewage treatment device and method thereof - Google Patents
Dephosphorization and denitrification, mud decrement and phosphorus recovery integrated sewage treatment device and method thereof Download PDFInfo
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Abstract
The invention provides a dephosphorization and denitrification, mud decrement and phosphorus recovery integrated sewage treatment device and a method thereof. The method adopts processes of hydrolysis acidification, multilevel series contact aeration and dephosphorization and denitrification A<2>/O of continuous flow, and comprises the following steps that: a hydrolysis acidification unit is used to treat raw sewage and a little anaerobic phosphorus releasing sludge to realize conversion of VFA; clear solution rich in the VFA after hydrolyzed supplies rich carbon sources for a subsequent dephosphorization and denitrification A<2>/O unit to reinforce synchronous dephosphorization and denitrification; and low concentration phosphorus in the sewage is enriched in the anaerobic phosphorus releasing sewage by the excessive phosphorus absorption capability of a phosphate accumulating organism, and the minor part of phosphorus enriched sewage is drained to carry out chemical phosphorus solidification. The dephosphorization mode can significantly reduce sewage quantity of chemical dephosphorization, improve the utility ratio of a dephosphorizing medicament, reduce dosage of the medicament, has high phosphorous amount in the obtained chemical sludge, and realizes recycle of the middle and low concentration phosphorus in urban sewage by the mode of non residue sludge under a condition of low cost. Sludge decrement can be realized through biofacies separation of a multilevel series contact aeration tank and the function of microorganism predation grade by grade.
Description
Technical field
The present invention relates to the apparatus and method that a kind of biotechnology is disposed of sewage, particularly a kind of sewage disposal technology that integrates dephosphorization denitrogenation, mud decrement and phosphorus enriching and recovering.
Background technology
Along with the growth of municipal effluent generation and the raising of processing rate, as the also increase simultaneously and rapidly of quantity of sewage disposal by product excess sludge.In the face of the mud that produces continually, traditional mud is terminal to be handled disposal options and is in technology, economy, or all is under suspicion aspect the environmental safety, and minimizing technology in mud source is arisen at the historic moment under this background just.But up to now, all there is shortcoming in the various mud decrement technology of exploitation both at home and abroad, wherein the most thorny show as that mud decrement is effective, the surplus sludge volume that produces just less, the nitrogen phosphorus amount that enters in the mud also reduces thereupon, thereby causes nitrogen, phosphorus poor removal effect, especially phosphorus.And along with the aggravation of body eutrophication trend, the removal of nutritive substances such as nitrogen phosphorus has become the vital task of municipal sewage treatment, therefore,, be the technical barrier that to face in the research of sewage plant sludge Decrement Technique how guaranteeing that wastewater treatment efficiency especially implements mud decrement under the prerequisite of dephosphorization and denitrification effect.
Sustainable use problem that it should be noted that limited, non-renewable phosphor resource on the earth is also put to the world just urgently.And the phosphorus that runs off along with urban sewage discharge not only causes the waste of land phosphor resource but also aggravation body eutrophication process, and in this case, the recovery of phosphorus and recycling just become particularly important in the municipal effluent.It is exactly with the process of the phosphorus in the sewage with the form recovery that can be utilized by phosphate industry or fertilizer industry that so-called phosphorus reclaims, rather than phosphorus is transferred in the mud.Therefore, how to realize phosphorus in the municipal effluent with the form of non-residue mud by enriching and recovering, also be a technical barrier that needs to be resolved hurrily.
At present, more both at home and abroad to the development research of mud decrement technology with good decrement effect, and also begin to pay attention to topmost negative issue---the nitrogen that mud decrement brings gradually some investigator in recent years, the phosphorus removal effect is undesirable, but the technology of research and development mainly is at the removal effect that improves nitrogen, still talked evasively for the not tunable contradiction between mud decrement and the biological phosphate-eliminating, be not well solved as yet, and do not see as yet yet for realizing that when implementing the mud decrement technology low phosphorus is reported by the research of enriching and recovering with the non-residue sludge form in the municipal effluent.
Summary of the invention
At the problems referred to above, the invention provides a kind of dephosphorization denitrogenation, mud decrement and phosphorus recovery integrated sewage treatment device and method, its biological processing unit is the dephosphorization denitrogenation A that adopts acidication, plural serial stage contact aeration, Continuous Flow
2/ O technology is promptly utilized acidication cell processing raw waste water and anaerobic phosphorus release mud is with the conversion of realization VFA and the minimizing of sludge quantity on a small quantity, and the clear liquid that is rich in VFA after the hydrolysis is follow-up dephosphorization denitrogenation A
2/ O unit provides plentiful effective carbon source, has alleviated the competition of dephosphorization denitrogenation to carbon source, realizes dephosphorization denitrogenation effectively synchronously; Utilize the excess suction phosphorus ability of polyP bacteria that low phosphorus hydrochlorate in the sewage is enriched in the anaerobic phosphorus release sewage, get rid of the rich phosphorus sewage of small part anaerobism then and carry out the solid phosphorus processing of chemistry, this dephosphorization mode is compared with the terminal chemical dephosphorization technology of the municipal effluent of routine, can significantly reduce the chemical dephosphorization sewage quantity, significantly improve the utilization ratio of chemical dephosphorization medicament, reduce consumption of chemical agent, reduce cost, and gained chemical sludge phosphorus content height (near the phosphorus content of pure P contained compound), have significant recycling and be worth, thereby realized that low phosphorus is with the form of non-residue mud in the municipal effluent, recovery under low-cost condition; In addition, patented technology of the present invention also changes the complete hybrid aeration tank of adopting in the follow-up traditional activated sludge process into the plural serial stage contact aerator, this pond utilize organic concentration gradient, the water conservancy residence time and factor span of control such as dissolved oxygen concentration and biologic packing material packing ratio the different stand densities that improve microfaunas such as system's height, prolonged food chain, separate and the predation step by step of microfauna is realized the minimizing of mud by biophase.
Technical scheme of the present invention is as follows:
A kind of dephosphorization denitrogenation, mud decrement, phosphorus recovery integrated sewage treatment device, it comprises the placed in-line water inlet pipe of order, hydrolysis acidification pool, anaerobic pond, anoxic pond, plural serial stage contact aerator, second pond and rising pipe; In addition, with described anaerobic pond altogether wall be provided with the effluent settling tank, effluent settling tank water side is connected with the chemical dephosphorization pond by waste pipe, is connected by waste pipe between water side, chemical dephosphorization pond and the plural serial stage contact aerator feed-water end; Described anaerobic pond bottom bottom hydrolysis acidification pool between by the returned sluge pipe coupling; Rich phosphorus sludge is got rid of by sludge pipe in bottom, chemical dephosphorization pond; Anoxic pond water side and anaerobic pond feed-water end are by the returned sluge pipe coupling; Between second pond bottom and the anoxic pond feed-water end by the returned sluge pipe coupling.
Described plural serial stage contact aerator is divided into three lattice in proper order, and first lattice are bacterial growth district, the second lattice protozoon vitellarium, the 3rd lattice metazoan vitellarium, wherein are filled with combined stuffing in second and third lattice; Be connected by the nitrification liquid return line between water side, the 3rd lattice metazoan vitellarium and the anoxic pond feed-water end.
It is as follows to utilize said apparatus to carry out the method steps of sewage disposal:
(1) acidication is handled: allow sewage and anaerobic phosphorus release mud from anaerobic pond enter hydrolysis acidification pool in the lump, the average sludge concentration 15-20g/L of control hydrolysis acidification pool, hydraulic detention time 2.5-3h makes organism and microorganism cells in sewage and the anaerobic sludge mixed solution be converted into dissolved organic matter and VFA under the effect of hydrolysis acid-producing bacteria;
(2) supernatant liquor after the hydrolysis acidification pool processing is sent into anaerobic pond, hydraulic detention time 1～2h, mix with the backflow denitrification liquid of anoxic pond behind denitrification denitrogenation earlier, under agitation carry out anaerobic phosphorus release, make anaerobic pond reach the above anaerobic phosphorus release concentration of 50mg/L;
(3) about 10% the phosphorus mixed solution of releasing that is about the total flooding velocity of device in the anaerobic pond is sent into the effluent settling tank, after carrying out the glaur water sepn, rich phosphorus clear liquid is imported the chemical dephosphorization pond, residence time 30min carries out the chemical fixation of phosphorus, water outlet with the chemical dephosphorization pond simultaneously is controlled at 5mg/L, produce the rich phosphorus chemistry mud of phosphorous hydrochlorate amount 73%-83%, and rich phosphorus chemistry mud is got rid of, recycled;
(4) returned sluge of anaerobic pond being released behind the phosphorus nitrification liquid that remaining 90% mixed solution and plural serial stage contact aerator reflux and second pond is mixed together and sends into anoxic pond, stir and remove, remove partial organic substances simultaneously by the denitrification that nitrogen is finished in the effect of denitrifying bacteria;
(5) with the water outlet of anoxic pond with sending into the plural serial stage contact aerator from the dephosphorization supernatant liquor that is about the total flooding velocity 10% of device of chemical dephosphorization pond after dephosphorization, under the nitrifier effect, ammonia nitrogen is converted into the remaining organism of nitric nitrogen, the aerobic absorption of under the polyP bacteria effect, finishing phosphorus and Degradation and Transformation;
(6) mixed solution behind the plural serial stage contact aerator biological respinse is sent into second pond at last, hydraulic retention 1h, discharge supernatant liquor, simultaneously the propagation sludge quantity in the anaerobic pond is back to hydrolysis acidification pool and the sewage acidification that is hydrolyzed in the lump again, carry out the next one and circulate.
Advantage of the present invention
(1) adopt VFA that acidication step process sewage and anaerobic phosphorus release mud produces as a supplement nitrogen, phosphorus remove required matrix, improve system synchronization denitrogenation dephosphorizing ability, reduce anaerobism, hypoxia response time, hold, reduce the processing energy consumption thereby reduce the pond
When having limited nitrogen phosphorus, the municipal effluent of low-concentration organic efficiently removes, the technology of the present invention is by acidification that raw waste water and small part anaerobic phosphorus release mud are hydrolyzed, change non-dissolved organic matter wherein into dissolved organic matter, the difficult for biological degradation larger molecular organics is changed the small organic molecule (VFA) of readily biodegradable, for system's dephosphorization denitrogenation provides plentiful effective carbon source, alleviated biological phosphate-eliminating, the contradiction of competition carbon source in the denitrification process, thereby strengthened the system biological dephosphorization and denitrification effect, also reduced simultaneously follow-up anaerobism, the hypoxia response time, hold thereby reduce the pond, reduce and handle energy consumption.
Described ' anaerobic phosphorus release mud be hydrolyzed acidifying ' has its unique advantage than excess sludge (aerobic sludge) acidication of other software engineering researchers invent researchs: though the acidication of raw waste water and excess sludge mixed solution also can improve the Biodegradability of Wastewater and the mud of degrading, but because the dominant bacteria in the hydrolysis acidification pool is based on facultative and anerobe, obtaining good hydrolysis produces sour effect and must guarantee that its dominant microflora is not destroyed, and excess sludge is from the mud (be aerobic sludge) of the terminal aerobic section of reaction process through post precipitation, with the aerobic bacteria is dominant bacteria, it is passed back into hydrolytic tank must influence its microbial species group structure and superiority bacteria spp to a certain extent, thereby weakens the acidication ability.And anaerobic pond mud mainly contains anerobe, and is very strong with hydrolytic tank dominant bacteria consistency, it is back to hydrolytic tank not only can destroy its dominant bacteria, in addition the degradation capability of energy enhanced hydrolysis acid-producing bacteria, the degradation rate of raising mud cell.In addition, because active mud content only accounts for about 1% of mixed solution ratio in the Sewage treatment systems, therefore, the phosphorus content in the returned sluge (containing 99% water approximately) is similar to the phosphorus content in the sewage.So anaerobic phosphorus release mud is more much higher than the phosphorus content in the excess sludge (aerobic suction phosphorus sludge), so, the sour method of producing the back hydrolysis of anaerobic phosphorus release mud replacement excess sludge has weakened the dilute strength to hydrolytic tank phosphorus, then weakened dilute strength indirectly to follow-up anaerobic pond phosphorus, comparatively speaking, help to reduce the chemical treatment amount of rich phosphorus sewage and the consumption of chemical dephosphorization medicament, thereby reduce cost of sewage disposal.
(2) the complete mixed aeration pond in the traditional activated sludge process is changed into the plural serial stage contact aerator and can realize mud decrement and cut down the consumption of energy, acidication is handled anaerobic phosphorus release mud and is also played the mud decrement effect simultaneously
The present invention changes the complete mixed aeration pond in the follow-up traditional activated sludge process into the plural serial stage contact aerator, be divided into three separate lattice: the first lattice water conservancy residence time is shorter, utilize the more remaining organic foodstuff of system to stimulate and breed the growth of bacterium rapidly, but do not form zoogloea; The organism that the second lattice protozoon engulfs bacterium and further degrades and do not degraded; The 3rd lattice protozoon is eaten by metazoan again.Obviously, the plural serial stage contact aerator is tradition mixed aeration pond fully, can by biophase separate and microorganism step by step predation reduce system sludge output.Simultaneously,, can make sewage obtain under with less energy consumption handling, save oxygen-consumption at aerobic unit by each lattice dissolved oxygen of this pond is controlled at low concentration.In addition, the acidication unit is VFA by the effect of hydrolysis and acid formers with the bacterial cell decomposition and inversion in the anaerobic phosphorus release mud, also can play mud decrement effect to a certain degree.
(3) the dephosphorization mode that effluxes the rich phosphorus sewage of anaerobism and carry out chemical fixation has solved in the mud decrement technology dephosphorization and the mud decrement effect excellent contradiction of can not holding concurrently, and has realized that simultaneously low phosphorus in the municipal effluent is with the form of non-residue mud, recovery under low-cost condition
In the chemical dephosphorization process, the main hydroxyapatite (Ca that generates of phosphorus in the sewage and chemical phosphor-curing agent (lime) reaction
5(PO
4)
3OH), secondary calcium phosphate (CaHPO
4), calcium phosphate (Ca
3(PO
4)
2) precipitation, the lime carbonate of association simultaneously (CaCO
3).The phosphor-curing agent dosage depends on phosphor in sewage hydrochlorate and carbonate concentration (representing with the form of sewage basicity) in municipal effluent.Municipal effluent (low-phosphorous sewage) when carrying out chemical dephosphorization, be it has been generally acknowledged that the dosage of phosphor-curing agent depends on sewage basicity rather than phosphate concn, and the effective rate of utilization of medicament is low, expense is high, thereby has hindered chemical phosphorus removal system in actual application in engineering.Provided by the inventionly thisly efflux that the rich phosphorus sewage of anaerobism carries out the dephosphorization mode of chemical fixation and the terminal chemical dephosphorization technology of conventional municipal effluent (all sewage) is compared, by reinforcement to the anaerobic phosphorus release process, only need part anaerobic phosphorus release sewage (10-15% that is equivalent to the sewage total amount approximately) is implemented the solid phosphorus of chemistry, significantly reduced the chemical dephosphorization sewage quantity, and still need behind the solid phosphorus of this part sewage and enter Sewage treatment systems and participate in biochemical reaction process, therefore can phosphorus concentration be controlled at about 5mg/l (not being 0.5mg/l) in the solution with consolidating behind the phosphorus, can also reduce the fixedly chemical agent amount of unit phosphorus needs like this.And compare with low-phosphorous municipal effluent, in the rich phosphorus sewage of anaerobism, add low dosage phosphor-curing agent (lime) and just can produce tangible phosphorous chemical precipitates, can significantly improve the chemical dephosphorization medicament utilization ratio, reduce consumption of chemical agent (for the rearmounted chemical phosphorus removal system of municipal effluent about 10%), reduce cost, and gained chemical sludge phosphate content (is counted 16-18% with P up to 73%-83%,), with the phosphorous rate of pure P contained compound very near (the phosphorous rate of hydroxyapatite, secondary calcium phosphate, calcium phosphate is respectively 18.5%, 22.8%, 20%).Have significant recycling and be worth, this mud can be used as complex fertilizer additive and uses or directly be delivered to phosphate fertilizer plant and substitute phosphorus ore resource, has realized that low phosphorus in the municipal effluent is with the form of non-residue mud, recovery under low-cost condition.Simultaneously, the rich phosphorus sewage of this row of the present invention replaces the dephosphorization mode of row's excess sludge to solve a most thorny difficult problem in the mud decrement technology---and " surplus sludge volume that mud decrement is effective, produce is just less, the phosphorus amount removed by spoil disposal is few, system's phosphor-removing effect is poor ", can obtain good mud decrement and phosphor-removing effect synchronously.
Description of drawings
Fig. 1 collects the structural representation that dephosphorization denitrogenation, mud decrement, phosphorus are recovered in the waste disposal plant of one for the present invention.
Embodiment
Referring to Fig. 1, this device is composed in series by water inlet pipe 1, hydrolysis acidification pool 2, anaerobic pond 3, anoxic pond 4, plural serial stage contact aerator 5, second pond 6, rising pipe 7 orders.Anaerobic pond 3 is total to wall with effluent settling tank 8; Be connected by a waste pipe 10 between effluent settling tank 8 water sides and chemical dephosphorization pond 9 feed-water ends; Be connected by No. two waste pipes 11 between 9 water sides, chemical dephosphorization pond and plural serial stage contact aerator 5 feed-water ends; Be connected by a reflux sludge tube 12 between anaerobic pond 3 bottoms and hydrolysis acidification pool 2 bottoms; Rich phosphorus sludge is got rid of by sludge pipe 13 in 9 bottoms, chemical dephosphorization pond; Anoxic pond 4 water sides are connected by No. two reflux sludge tubes 14 with anaerobic pond 3 feed-water ends; Be connected by No. three reflux sludge tubes 15 between second pond 6 bottoms and anoxic pond 4 feed-water ends.Described plural serial stage contact aerator 5 is divided into three lattice, and the first lattice bacterial growth district 16, the second lattice protozoon vitellarium 17, the 3rd lattice metazoan vitellarium 18 wherein are filled with combined stuffing 19 in second and third lattice; Be connected by nitrification liquid return line 20 between 18 water sides, the 3rd lattice metazoan vitellarium and anoxic pond 4 feed-water ends.
The process that this device specifically carries out sewage disposal is as follows:
(1) sewage enters hydrolysis acidification pool 2 from bottom of device, the average sludge concentration 15-20g/L in this pond, hydraulic detention time 2.5-3h in the lump by water inlet pipe 1 and anaerobic phosphorus release mud from anaerobic pond 3.Organism in sewage and the anaerobic sludge mixed solution and microorganism cells are converted into dissolved organic matter and VFA under the effect of hydrolysis acid-producing bacteria.The acidication effect can also promote the further release from phosphorus in the anaerobic pond mud cell, improves the anaerobic pond phosphorus concentration, strengthens phosphor-removing effect.
(2) supernatant liquor that is rich in VFA after said hydrolyzed acidification pool 2 is handled enters anaerobic pond 3 (hydraulic detention time 1～2h), at first (denitrification liquid quantity of reflux is 100%～150% of a flooding velocity with the backflow denitrification liquid of anoxic pond 4 behind denitrification denitrogenation, be lower than the minimizing that this value can cause the anaerobic pond sludge quantity, be higher than this value then can influence because of the more amount nitrate that phegma is brought into release the phosphorus effect) mix, the acidication liquid of higher VFA concentration is released phosphorus for the reinforcement polyP bacteria effective carbon source is provided, under stirring, agitator 21 carries out anaerobic phosphorus release, remove partial organic substances simultaneously, anaerobic pond 3 reaches the above anaerobic phosphorus release concentration of 50mg/L.
(3) be about the effluent settling tank 8 that the phosphorus mixed solution enters common wall of releasing of the total flooding velocity about 10% of device in the above-mentioned anaerobic pond 3, after the 1h hydraulic detention time carries out the glaur water sepn, rich phosphorus clear liquid imports the chemical fixation that chemical dephosphorization pond 9 (about residence time 30min) carry out phosphorus by a waste pipe 10, with 5mg/L as chemical dephosphorization pond 9 water outlet controlled target, produce phosphorous hydrochlorate amount and (count 16-18% with P, with P up to 73%-83%
2O
5Count 36-40%) rich phosphorus chemistry mud, get rid of by bottom sludge pipe 13, and recycle in complex fertilizer additive or deliver to phosphate fertilizer plant and substitute phosphorus ore resource.
(4) anaerobic pond 3 returned sluge (by No. three reflux sludge tubes 15) of releasing behind the phosphorus remaining 90% mixed solution and plural serial stage contact aerator 5 water side nitrification liquids (by nitrification liquid return line 20) and second pond 6 is mixed together and enters anoxic pond 4, the denitrification of finishing nitrogen by the effect of denitrifying bacteria under agitator 21 stirs removes, and removes partial organic substances simultaneously.Wherein, the nitrification liquid reflux ratio is that (be lower than this span, system's nitrogen removal rate is lower for 150-200%; Be higher than this span, anoxic pond 4 can make that denitrification denitrogenation efficient reduces because of dissolved oxygen concentration is too high), residual sludge reflux is than being 30-50%, with sludge concentration and the denitrification denitrogenation efficient of keeping anoxic pond.
(5) above-mentioned anoxic pond 4 water outlets are with entering plural serial stage contact aerator 5 from the dephosphorization supernatant liquor that is about the total flooding velocity 10% of device (by No. two waste pipes 11) of chemical dephosphorization pond 9 after dephosphorization, ammonia nitrogen are converted into the remaining organism of nitric nitrogen, the aerobic absorption of finishing phosphorus under the polyP bacteria effect and Degradation and Transformation under the nitrifier effect.Simultaneously, plural serial stage contact aerator 5 is by being divided into three relatively independent lattice, utilize the difference of controlling factors scopes such as organic concentration gradient, the water conservancy residence time, dissolved oxygen concentration and biologic packing material packing ratio to improve high microbial growth density, food and extend chain (bacterium-protozoon-metazoan) utilizes the predation step by step of microorganism to realize mud decrement.Plural serial stage contact aerator 5 first lattice bacteriums disperse the hydraulic detention time of vitellarium 16 to be controlled at 30-45min; DO is controlled at 0.5-1.0mg/L; this pond mainly utilizes the remaining solvability COD behind denitrogenation dephosphorizing of system to cultivate the dispersion of breeding more amount but not the bacterium of zoogloea state; the bacterium that loses zoogloea protection in follow-up second lattice protozoon vitellarium 17 and the 3rd lattice metazoan vitellarium 18 by high level former; the microzoa predation is given birth in the back; reduced excess sludge production; and high level microfauna is also by the big further degradable organic pollutant of organic granular of eating in these two lattice; its hydraulic detention time is respectively 1.5-2h and 2-2.5h; DO concentration is respectively 0.5-1.0mg/L and 1.0-1.5mg/L, and the biologic packing material packing ratio is 30-40%.The low DO concentration of plural serial stage contact aerator 5 control makes sewage obtain handling under with less energy consumption at aerobic unit, has saved oxygen-consumption.
(6) mixed solution behind plural serial stage contact aerator 5 biological respinses enters second pond 6 (hydraulic retention 1h) at last, the precipitation supernatant liquor is discharged from rising pipe 7, the sludge quantity of system propagation is back to hydrolysis acidification pool 2 acidification that is hydrolyzed by reflux sludge tube 12 with the mud in the anaerobic pond 3, improve the biodegradability of sewage, the small organic molecule amount that increase is easily absorbed by microorganism, play the mud decrement effect simultaneously.The anaerobic sludge amount that is back to hydrolytic tank 2 is the 2-4% of flooding quantity, be lower than this span and then cause acidication mud decrement poor effect, and the VFA amount that hydrolysis produces can't satisfy follow-up anaerobic phosphorus release and the required enough carbon sources of anoxic denitrification; Be higher than the minimizing that this span then causes the system activity microbial biomass, influence system's wastewater treatment efficiency.
Concrete application example 1: the sanitary sewage with the discharging of campus, Chongqing is a process object, and the device flooding velocity is 20L/h, water inlet COD 225-344mg/L, NH
3-N 31-45mg/L, TN 37-56mg/L, TP 7-9mg/L, pH value 7-8, test temperature is 20-24 ℃.Test-results shows: when anaerobic pond mixed-liquor return acidication amount be flooding velocity 2% the time, anaerobic phosphorus release concentration reaches about 55mg/L, efflux the rich phosphorus sewage quantity of the anaerobism of carrying out the solid phosphorus of chemistry for handling 10% of the water yield, gained chemical sludge phosphate content is 73% (counting 16% with P).System's effluent COD concentration can not detect, and closely very removes; System's water outlet TP concentration is less than 0.5mg/L, and average removal rate surpasses 93%; The water outlet NH of system
3-N concentration on average goes out rate greater than 97% below 1mg/L; System's water outlet TN concentration is less than 15mg/L, and average removal rate surpasses 68%; The apparent yield coefficient of system sludge is 0.1, is 1/3 of traditional denitrification dephosphorization technique sludge yield (about 0.3).
Concrete application example 2: the sanitary sewage with the discharging of campus, Chongqing is a process object, by throwing NH
4CI and K
2HPO
4Regulate NH
3-N, TN and TP concentration.The device flooding velocity is 20L/h, water inlet COD, NH
3-N, TN, TP concentration are respectively 225-344mg/L, NH
3-N 65-85mg/L, TN 65-85mg/L, TP 13-15mg/L, pH value 7-8, test temperature is 20-24 ℃.Test-results shows: when anaerobic pond mixed-liquor return acidication amount be flooding velocity 4% the time, VFA concentration is more than 350mg/L after the hydrolysis, anaerobic phosphorus release concentration is more than 60mg/L, efflux the rich phosphorus sewage quantity of the anaerobism of carrying out the solid phosphorus of chemistry for handling 15% of the water yield, gained chemical sludge phosphate content is 83% (counting 18% with P).System's effluent COD concentration can not detect, and closely very removes; System's water outlet TP concentration is less than 0.5mg/L, and average removal rate surpasses 96%; Water outlet NH
3-N concentration is below 2mg/L, and average removal rate is greater than 97%; Water outlet TN concentration is less than 15mg/L, and average removal rate surpasses 80%; The apparent yield coefficient of system sludge is 0.14, much smaller than traditional denitrification dephosphorization technique sludge yield (about 0.3).
Claims (7)
1, a kind ofly collects the waste disposal plant that dephosphorization denitrogenation, mud decrement, phosphorus are recovered in one, it is characterized in that described device comprises order placed in-line water inlet pipe (1), hydrolysis acidification pool (2), anaerobic pond (3), anoxic pond (4), plural serial stage contact aerator (5), second pond (6) and rising pipe (7); In addition, be total to wall with described anaerobic pond (3) and be provided with effluent settling tank (8), effluent settling tank (8) water side is connected with chemical dephosphorization pond (9) by a waste pipe (10), is connected by No. two waste pipes (11) between water side, chemical dephosphorization pond (9) and plural serial stage contact aerator (5) feed-water end; Be connected by a reflux sludge tube (12) bottom the described anaerobic pond (3) with between hydrolysis acidification pool (2) bottom; Rich phosphorus sludge is got rid of by sludge pipe (13) in bottom, chemical dephosphorization pond (9); Anoxic pond (4) water side is connected by No. two reflux sludge tubes (14) with anaerobic pond (3) feed-water end; Be connected by No. three reflux sludge tubes (15) bottom the second pond (6) with between anoxic pond (4) feed-water end.
2, collection dephosphorization denitrogenation according to claim 1, mud decrement, phosphorus are recovered in the waste disposal plant of one, it is characterized in that, described plural serial stage contact aerator (5) order is divided into three lattice, first lattice are that bacterial growth district (16), second lattice are that protozoon vitellarium (17), the 3rd lattice are metazoan vitellarium (18), wherein are filled with combined stuffing (19) in second and third lattice; Be connected by nitrification liquid return line (20) between water side, the 3rd lattice metazoan vitellarium (18) and anoxic pond (4) feed-water end.
3, utilize claim 1 or method that 2 described devices carry out sewage disposal, it is characterized in that described method is carried out according to the following steps:
(1) acidication is handled: allow sewage and anaerobic phosphorus release mud from anaerobic pond (3) enter hydrolysis acidification pool (2) in the lump, the average sludge concentration of control hydrolysis acidification pool (2) is at 15-20g/L, hydraulic detention time 2.5-3h makes organism and microorganism cells in sewage and the anaerobic phosphorus release mud mixed liquid be converted into dissolved organic matter and VFA under the effect of hydrolysis acid-producing bacteria;
(2) supernatant liquor after hydrolysis acidification pool (2) processing is sent into anaerobic pond (3), hydraulic detention time 1～2h, mix with the backflow denitrification liquid of anoxic pond (4) behind denitrification denitrogenation earlier, under agitation carry out anaerobic phosphorus release, make anaerobic pond (3) reach the above anaerobic phosphorus release concentration of 50mg/L;
(3) the phosphorus mixed solution of releasing that is about the total flooding velocity about 10% of device in the anaerobic pond (3) is sent into effluent settling tank (8), after carrying out the glaur water sepn, rich phosphorus clear liquid is imported chemical dephosphorization pond (9), residence time 30min carries out the chemical fixation of phosphorus, water outlet with chemical dephosphorization pond (9) simultaneously is controlled at 5mg/L, produce the rich phosphorus chemistry mud of phosphorous hydrochlorate amount 73%-83%, and rich phosphorus chemistry mud is got rid of, recycled;
(4) returned sluge of anaerobic pond (3) being released behind the phosphorus nitrification liquid that remaining 90% mixed solution and plural serial stage contact aerator (5) reflux and second pond (6) is mixed together and sends into anoxic pond (4), stir and remove, remove partial organic substances simultaneously by the denitrification that nitrogen is finished in the effect of denitrifying bacteria;
(5) with the water outlet of anoxic pond (4) with sending into plural serial stage contact aerator (5) from chemical dephosphorization pond (9) dephosphorization supernatant liquor that is about the total flooding velocity 10% of device after dephosphorization, under the nitrifier effect, ammonia nitrogen is converted into the remaining organism of nitric nitrogen, the aerobic absorption of under the polyP bacteria effect, finishing phosphorus and Degradation and Transformation;
(6) mixed solution behind plural serial stage contact aerator (5) biological respinse is sent into second pond (6) at last, hydraulic retention 1h, discharge supernatant liquor, simultaneously with the propagation sludge quantity in the anaerobic pond (3), be that anaerobic phosphorus release mud is back to hydrolysis acidification pool (2) and the sewage acidification that is hydrolyzed again, carry out next cycle of treatment.
4, the method for sewage disposal according to claim 3 is characterized in that, the denitrification liquid quantity of reflux of described step (2) is 100～150% of the total flooding velocity of device.
5, the method for sewage disposal according to claim 3 is characterized in that, the nitrification liquid reflux ratio of described step (4) is 150-200%, and residual sludge reflux is than being 30-50%.
6, the method for sewage disposal according to claim 3, it is characterized in that, in the described step (5), the first lattice bacterium of plural serial stage contact aerator (5) disperses the hydraulic detention time of vitellarium (16) to be controlled at 30-45min, DO is controlled at 0.5-1.0mg/L, the hydraulic detention time of described follow-up second lattice protozoon vitellarium (17) and the 3rd lattice metazoan vitellarium (18) is respectively 1.5-2h and 2-2.5h, DO concentration are respectively 0.5-1.0mg/L and 1.0-1.5mg/L, and the biologic packing material packing ratio is 30-40%.
7, the method for sewage disposal according to claim 3 is characterized in that, in the described step (6), being back to hydrolysis acidification pool (2) anaerobic phosphorus release sludge quantity by anaerobic pond (3) is the 2-4% of the total flooding velocity of device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101038024A CN101544453B (en) | 2009-05-07 | 2009-05-07 | Dephosphorization and denitrification, mud decrement and phosphorus recovery integrated sewage treatment device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101038024A CN101544453B (en) | 2009-05-07 | 2009-05-07 | Dephosphorization and denitrification, mud decrement and phosphorus recovery integrated sewage treatment device and method thereof |
Publications (2)
| Publication Number | Publication Date |
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