CN104556572A - Efficient biochemical nitrogen and phosphorus removal method for waste water - Google Patents
Efficient biochemical nitrogen and phosphorus removal method for waste water Download PDFInfo
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Abstract
The invention discloses an efficient biochemical nitrogen and phosphorus removal method for waste water. Ammonia nitrogen and phosphorus in waste water are efficiently removed by combining a modified A2/O biological nitrogen and phosphorus removal technology and a chemical method, namely, zeolite adsorbing ammonia nitrogen method; the denitrification liquid flowing out from an anoxic denitrification tank enters an aerobic nitration tank to form internal circulation; the residual denitrification liquid directly enters a sedimentation tank for solid-liquid separation; phosphorus-accumulating bacteria directly flows back to an anaerobic tank from the sludge of a sedimentation tank, and then enters the anoxic nitration tank. Ion adsorption and biological regeneration treatment are combined; water outlet total nitrogen is less than or equal to 5 mg/L; the removal ratio of total nitrogen and total phosphorus is more than 90%; requirements that water outlet total nitrogen in Taihu basin chemical engineering zone is superior to the primary standard, namely, the A standard, of the urban sewage treatment plant pollutant discharge standard (GB18918-2002) are met stably.
Description
Technical field
The invention belongs to field of environment engineering technology, be specifically related to a kind of method of waste water high-efficiency biochemical denitrification dephosphorization.
Background technology
The waste water quality of Taihu Lake basin chemical industrial park enterprise discharge is complicated, and variation water quality is large, and hard-degraded substance is many, and nitrogen element and phosphoric exist in a large number as nutritive element, biodegradability extreme difference; Simultaneously due to original denitrogenation dephosphorizing treatment facility or the simple imperfection for the treatment of process, there is a lot of problem, go out water pollutant index high, cause water pollution, very large impact is caused on hydrobiont and surrounding enviroment.To this, Taihu Lake basin chemical industrial park requires that enterprise's strict implement is better than " urban wastewater treatment firm pollutant emission standard " (GB18919-2002) one-level A standard (particularly TN≤5mg/L), as shown in table 1, limit factory, enterprise to the discharge of N, P nutritive element.
Table 1 basic controlling project the highest permission emission concentration (annual average) unit mg/L
Common denitrification and dephosphorization method has materialization denitrogenation dephosphorizing method and biochemical denitrification dephosphorization method, and because the removal effect of physics denitrification dephosphorization technique is not obvious, operation and maintenance expense aspect is very expensive; The chemical agent that chemistry denitrification dephosphorization technique adds is uneconomical, and the liquid waste disposal difficulty produced, running cost is high, and very likely bring secondary pollution to environment, thus Biological Nitrogen Removal Processe as one relatively Economic contrast process method for waste water efficiently, be widely used in wastewater treatment.
The project of more than 35% is had to adopt anaerobic-anoxic-oxic (A in the biological carbon and phosphorous removal biochemical process of current comparatively mature and reliable
2/ O) technique, in this technique, in water outlet, phosphorus ligands effect is about 70%, and denitrification effect can be about 80%.Precipitate and separate is carried out because the nitrification liquid in aerobic nitrification pond directly enters settling tank, thus nitre nitrogen and nitrite nitrogen is contained in water outlet, in addition, the mixed solution entering settling tank needs to keep certain dissolved oxygen concentration usually, phosphorus is released to prevent denitrification and sludge anaerobic in settling tank, but this can cause there is certain dissolved oxygen in returned sluge and backflow mixed liquor affects anaerobic phosphorus release, and the nitrate existed in returned sluge in addition also has certain influence to anaerobic phosphorus release process; Meanwhile, in the excess sludge that system is discharged, only some mud is the process that experienced by complete anaerobic and aerobic, have impact on the abundant suction phosphorus of mud; System sludge mud age because take into account nitrifier growth and can not be too short, cause phosphor-removing effect to be difficult to further improve.Therefore traditional A
2/ O technique usually there is carbon source and basicity is not enough, anaerobic pond does not ensure mud not equal many technical problems in age needed for absolute anaerobic environment and biological carbon and phosphorous removal, for the requirement (particularly TN≤5mg/L) that will reach nitrogen phosphorus index in the waste water of chemical industrial park and be better than the one-level A standard of " urban wastewater treatment firm pollutant emission standard " (GB18918-2002), still there is very Da I Member distance.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of A of improvement
2/ O biochemical denitrification dephosphorization technique, bound zeolite absorption method carries out efficient Transformatin to the ammonia nitrogen in waste water and phosphorus, reaches nitrogen phosphorus index in waste water and is better than the requirement of the one-level A standard of " urban wastewater treatment firm pollutant emission standard " (GB18918-2002).
Technical scheme: for achieving the above object, technical scheme of the present invention is as follows:
A method for waste water high-efficiency biochemical denitrification dephosphorization, is characterized in that: comprise the following steps:
1), anaerobic reaction section: mainly carry out releasing phosphorus in anaerobic reation pool, waste water containing nitrogen phosphorus enters anaerobic reation pool, the returnedactivatedsludge also had from settling tank simultaneously entered, polyP bacteria in described returnedactivatedsludge fully releases phosphorus under anaerobic environment, and the zeolite simultaneously in anaerobic reation pool is by the ammonia nitrogen in waste water described in adsorption enrichment;
2), anoxic denitrification section: mainly carry out denitrogenation in anoxic denitrification pond, inhale phosphorus and organic matter degradation, waste water enters anoxic denitrification pond after anaerobic reation pool, the nitrification liquid also had from aerobic nitrification pond simultaneously entered, active sludge containing polyP bacteria and denitrifying bacteria and zeolite coexist in anoxic denitrification pond, stir, make mud in anoxic denitrification pond be suspension flow state; Wherein polyP bacteria inhales phosphorus, and zeolite continues the ammonia nitrogen in absorption waste water, and under anoxic conditions, organism utilizes nitrate to remove for electron acceptor(EA) and oxidized degraded under the effect of denitrifying bacteria, and nitrate, nitrate reductase are become N
2release is discharged; Denitrification liquid after anti-nitration reaction enters aerobic nitrification pond, inhales the polyP bacteria after phosphorus and remain denitrification liquid then directly to enter settling tank;
3), aerobic nitrification section: mainly carry out the nitrated of ammonia nitrogen in aerobic nitrification pond, under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, and ammonia nitrogen and zeolite desorption, make zeolite regeneration simultaneously;
4), precipitating phase: the residue denitrification liquid in anoxic denitrification pond directly enters settling tank, leave standstill, solid-liquid separation, discharge supernatant liquor to obtain processing water, the active sludge of lower floor is divided three classes: a part is back to anaerobic reation pool for returnedactivatedsludge, a part delivers to aerobic nitrification pond for residual activity mud, and excess sludge is regularly outside discharge system; The phosphorus absorbed in active sludge is got rid of by excess sludge.
Nitrifier is very sensitive to pH, and the Optimal pH of nitration reaction is 8.0 ~ 8.4, and nitration reaction process can generate HNO
3pH of mixed is declined, and the basicity that denitrification process produces can compensate the basicity that nitration reaction consumes.In the inner cyclic process of nitrification-denitrification, pH environment needed for nitrifying process and denitrification process afford redress each other mutually, ensure that the Optimal pH of nitration reaction is 8.0 ~ 8.4, and the optimum pH value of anti-nitration reaction is 6.5 ~ 7.5, be greater than 8 or be less than 7 all unfavorable.
Further, in the present invention, in described step 2) in, first aeration is carried out before residue denitrification liquid enters settling tank, the organism that dissolved oxygen still remains with oxidative degradation after the effect of anoxic denitrification pond is provided, promotes that the polyP bacteria in active sludge fully absorbs phosphorus again under aerobic environment simultaneously; Meanwhile, the mixed solution entering settling tank needs to keep certain dissolved oxygen concentration usually, releases phosphorus to prevent anti-nitration reaction and sludge anaerobic in settling tank.
Further, in the present invention, in described step 2) in, carry out aeration when the denitrification liquid in anoxic denitrification pond enters aerobic nitrification pond, to increase the dissolved oxygen in aerobic nitrification pond, promote that nitrification is carried out.
Further, in the present invention, described step 4) in, the returnedactivatedsludge being back to anaerobic reation pool is 1:1 with the volume ratio of the residual activity mud delivering to aerobic nitrification pond.The ratio of returnedactivatedsludge directly affects the concentration of active sludge and the Deposition Situation of settling tank in anaerobic nitrification pond.
Further, in the present invention, the return current ratio of the mixed liquid of described denitrification liquid is 200% ~ 400%.In return sludge ratio one timing, if the nitrate concentration that aerobic nitrification pond produces is higher, then need the water outlet requirement that larger return current ratio of the mixed liquid just can reach same, return current ratio of the mixed liquid increases, nitric efficiency is improved, the return current ratio of the mixed liquid of 200% ~ 400% just can make its recirculation experience denitrification, realizes the object effectively removing nitrate thus; And the return current ratio of the mixed liquid more than 400% can not significantly improve the clearance of nitrate, backflow consumed power is caused to increase on the contrary, cause running cost to rise, the dissolved oxygen in aerobic nitrification pond can be caused simultaneously to be too much back to anoxic denitrification pond, affect whole technical process.
Further, in the present invention, in described step 4) in, when excess sludge timing is discharged outside system, be discharged owing to there being a small amount of zeolite thereupon, therefore zeolite is added in aerobic nitrification tank or anoxic denitrification pond, the MLSS in each biological treatment tank is maintained high density, to improve nitrification speeds and denitrification speed.
Further, in the present invention, the magnitude of recruitment of described zeolite is 50 ~ 60mg/L, fills up the vacancy of the zeolite be discharged, the balance of keeping system mesolite total amount, ensures that the absorption of ammonia nitrogen and denitrification reaction normally run.
Further, in the present invention, the particle diameter of described zeolite is 45 ~ 55 μm, the zeolite proportion of this size and water close to and be not easily sunken at the bottom of pond, be easy to stirring suspension flowing.
Further, in the present invention, described zeolite is modified zeolite.
Beneficial effect: beneficial effect of the present invention is:
One, the denitrification liquid flowed out in anoxic denitrification pond enters aerobic nitrification pond and forms nitrification-denitrification internal recycle, improves the denitrification efficiency of nitre nitrogen and the mud age of active sludge and recycles rate, and effectively maintaining the suitable basicity of reaction process and pH environment, and remain denitrification liquid and directly enter settling tank solid-liquid separation, prevent excessive nitre nitrogen and nitrite nitrogen by activity sludge reflux to anaerobic reation pool, heterotrophic bacterium cannot utilize nitre nitrogen to consume the easily biodegradable organics of anaerobic zone as electron acceptor(EA), thus the organism carbon source making anaerobic reation pool that enough polyP bacterias can be kept all the time to utilize and absolute anaerobic environment, polyP bacteria in returned sluge is impelled fully to release phosphorus, store a large amount of energy substances in vivo, fully to inhale phosphorus under follow-up aerobic condition, therefore do not need to increase by second anoxic denitrification pond again and remove nitre nitrogen and nitrite nitrogen, also carbon source need not be added, decrease operation steps, reduce running cost.
Two, adsorption selection capacity is large and reproducible zeolite makes sorbent material, can not produce secondary liquid waste; And zeolite circulates regeneration in technical process, discharge is few, therefore increment is few, and running cost is cheap;
Three, polyP bacteria releases phosphorus from anaerobic reation pool, then entering anoxic ammonium oxidation pond and inhale phosphorus, without the need to directly entering settling tank by aerobic nitrification pond, then forming circulation dephosphorization with activity sludge reflux, this dephosphorization process makes the P uptake by plants of polyP bacteria in anoxic ammonium oxidation pond increase, phosphorus ligands effect stability.
Improvement A of the present invention
2the absorption of/O technique coupled ion and bio-regeneration method, make the clearance of water outlet total nitrogen and total phosphorus higher than 90%, total nitrogen≤5mg/L, meets the emission request that water outlet total nitrogen is better than " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) primary standard A standard.
Accompanying drawing explanation
Accompanying drawing 1 is the process flow diagram of the method for denitrogenation of waste water dephosphorization of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, a kind of method of waste water high-efficiency biochemical denitrification dephosphorization, is characterized in that: comprise the following steps:
1), anaerobic reaction section: mainly carry out releasing phosphorus in anaerobic reation pool 2, waste water 1 containing nitrogen phosphorus enters anaerobic reation pool 2, the returnedactivatedsludge 9 also had from settling tank 4 simultaneously entered, polyP bacteria in returnedactivatedsludge 9 releases phosphorus under anaerobic environment, and the zeolite simultaneously in anaerobic reation pool 2 is by the ammonia nitrogen in adsorption enrichment waste water 1; When not having nitric nitrogen and oxygen, polyP bacteria fully can release phosphorus, stores a large amount of energy substances in vivo, so as follow-up have the condition of oxygen under excessive suction phosphorus, then finally arrange phosphorus by discharging the mode of phosphorus containing sludge.
2), anoxic denitrification section: mainly carry out denitrogenation in anoxic denitrification pond 3, inhale phosphorus and organic matter degradation, waste water 1 enters anoxic denitrification pond 3 after anaerobic reation pool 2, the nitrification liquid 12 also had from aerobic nitrification pond 5 simultaneously entered, active sludge containing polyP bacteria and denitrifying bacteria and zeolite coexist in anoxic denitrification pond 3, stir, make mud in anoxic denitrification pond 3 be suspension flow state; Wherein polyP bacteria inhales phosphorus, and zeolite continues the ammonia nitrogen in absorption waste water 1, and under anoxic conditions, organism utilizes nitrate oxidized degraded removal as electron acceptor(EA) under the effect of denitrifying bacteria, and nitrate, nitrate reductase are become N
2release is discharged; A part of denitrification liquid 13 after anti-nitration reaction enters aerobic nitrification pond 5, inhales the polyP bacteria after phosphorus and remain denitrification liquid 7 directly to enter settling tank 4; First aeration is carried out before residue denitrification liquid 7 and phosphorous active sludge enter settling tank 4; The denitrification liquid 13 in anoxic denitrification pond 3 and the active sludge of bottom carry out aeration when entering aerobic nitrification pond 5.
3), aerobic nitrification section: mainly carry out the nitrated of ammonia nitrogen in aerobic nitrification pond 5, under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, and ammonia nitrogen and zeolite desorption, make zeolite regeneration simultaneously;
4), precipitating phase: the residue denitrification liquid 7 in anoxic denitrification pond 3 directly enters settling tank 4, and after leaving standstill for some time, solid-liquid separation, discharges supernatant liquor and obtain SS, BOD
5, TP, nitric nitrogen and ammonia nitrogen be all by the process water 8 highly removed, the active sludge of lower floor is divided three classes: a part is back to anaerobic reation pool 2 for active sludge 9, a part proceeds nitration reaction for residual activity mud 10 through being pumped to aerobic nitrification pond 5, and remaining excess sludge 11 timing discharge system directly carries out processed outward; The phosphorus absorbed in active sludge is got rid of by excess sludge 11.The returnedactivatedsludge 9 being wherein back to anaerobic reation pool 2 is 1:1 with the volume ratio of the residual activity mud 10 delivering to aerobic nitrification pond 5.When excess sludge 11 timing is discharged outside system, in aerobic nitrification tank 5 or anoxic denitrification pond 3, add zeolite, the magnitude of recruitment of zeolite is 50 ~ 60mg/L, and the particle diameter of zeolite is 45 ~ 55 μm, and zeolite is preferably modified zeolite.。
Nitrification liquid 12 in aerobic nitrification pond 5 after nitration reaction is back in anoxic denitrification pond 3, and the nitrite nitrogen in nitrification liquid 12 and nitre nitrogen are reduced to N by denitrifying bacteria under anoxic conditions
2release is discharged, and the zeolite simultaneously after regeneration continues the ammonia nitrogen in absorption waste water 1; Thereafter, the denitrification liquid 13 after denitrification and base section precipitating sludge enter aerobic nitrification pond 5 again and carry out nitration reaction, form the internal recycle of nitrification-denitrification thus; The return current ratio of the mixed liquid of denitrification liquid 13 is 200% ~ 400%.
Anoxic denitrification pond 3 is front, organic carbon in waste water 1 utilize by denitrifying bacteria, larger molecular organics is made to be decomposed into small organic molecule, insoluble organism changes into dissolved organic matter, when these products through anaerobic hydrolysis enter aerobic nitrification pond 5 carry out aerobic treatment time, improve the biodegradability of sewage, and improve the efficiency of oxygen, therefore not only effectively remove BOD
5, also can alleviate the organic loading in aerobic nitrification pond 5 thereafter, prevent BOD
5excessive concentration, in active sludge, heterotrophic bacterium breeds rapidly, suppresses the growth of autotrophic bacteria and nitrifier that nitration reaction is stagnated.
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1
The A that Taihu Lake basin chemical industrial park enterprise selects the present invention to improve
2/ O denitrification dephosphorization technique is received the waste water of dirty pipe network carry out denitrogenation dephosphorizing process to being entered municipal administration, the waste water quality of water inlet is as shown in table 2, the equal serious non-compliance of indices " urban wastewater treatment firm the pollutant emission standard " (emission request of GB18918-2002 primary standard A standard.Concrete experiment condition is as shown in table 3, runs the process water taking settling tank water outlet to obtain after 2 months and again detects.
The waste water quality situation that table 2 is intake
| Water-quality guideline | Water temperature (DEG C) | pH | SS(mg/L) | BOD(mg/L) | TP(mg/L) | TN(mg/L) | NH 3-N(mg/L) |
| Content | 24 | 7.6 | 115 | 132 | 7.3 | 38 | 28 |
Table 3 experiment condition
Concrete technology step is as follows:
Taihu Lake basin chemical industrial park enterprise enters municipal administration, and to receive the waste water of dirty pipe network be object, and carry out method of the present invention and carry out experimental verification, technical process as shown in Figure 1.This tests zeolite used, and to derive from the particle diameter that Henan Gongyi City plumbing equipment factory produces be the zeolite of powdery zeolite after modification of 50 μm.
1), the waste water 1 of Nitrogen-and Phosphorus-containing flows in anaerobic reation pool 2, and enter a part of active sludge 9 also had from the backflow in settling tank 4 of anaerobic reation pool 2, the polyP bacteria in active sludge 9 releases phosphorus under anaerobic environment, promotes follow-up aerobic dephosphorization ability simultaneously; Zeolite removes a part of ammonia nitrogen by adsorption simultaneously.
2) mud, flowed out from anaerobic reation pool 2 enters anoxic denitrification pond 3, the nitrification liquid 12 also had from aerobic nitrification pond 5 pump around circuit simultaneously entered.Active sludge containing polyP bacteria and denitrifying bacteria and zeolite coexist in anoxic denitrification pond 3, stir in suspension flow state.Ammonia nitrogen on the one hand in From Wastewater Using Zeolite, the polyP bacteria on the other hand in active sludge and denitrifying bacteria take zeolite as carrier, and propagation removes the part ammonia nitrogen in waste water and BOD.Utilize BOD, SS etc. in the nitrate nitrogen in nitrification liquid 12 and nitrite nitrogen and anaerobic reation pool 2 to carry out biological denitrificaion simultaneously.
3), a part is back in aerobic nitrification pond 5 from the denitrification liquid 13 in anoxic denitrification pond 3, and in aerobic nitrification pond 5, being adsorbed in the effect of the ammonia nitrogen on zeolite through nitrifier from desorption zeolite makes zeolite be able to bio-regeneration; Remaining denitrification liquid 7 enters settling tank 4 and carries out solid-liquid separation, obtains SS, BOD, TP, nitric nitrogen and ammonia nitrogen all by the process water 8 highly removed.
4) a part of active sludge 9, be separated is back in anaerobic reation pool 2.Remaining a part of active sludge 10 is pumped to aerobic nitrification pond 5, and remainder active sludge is discharged as excess sludge 11 and carries out processed.Further, the pipeline section between anoxic denitrification pond 3 and settling tank 4 carries out the aeration of short period of time to remove BOD and to promote that in active sludge, polyP bacteria absorbs removal phosphorus.
Embodiment 2
The waste water quality of water inlet identical with embodiment 1 and concrete experiment condition, run the process water taking settling tank water outlet to obtain after 2 months and again detect.
Concrete technology step is as follows:
1), anaerobic reaction section: mainly carry out releasing phosphorus in anaerobic reation pool 2, waste water 1 containing nitrogen phosphorus enters anaerobic reation pool 2, the returnedactivatedsludge 9 also had from settling tank 4 simultaneously entered, polyP bacteria in returnedactivatedsludge 9 releases phosphorus under anaerobic environment, and the zeolite simultaneously in anaerobic reation pool 2 is by the ammonia nitrogen in adsorption enrichment waste water 1; When not having nitric nitrogen and oxygen, polyP bacteria fully can release phosphorus, stores a large amount of energy substances in vivo, so as follow-up have the condition of oxygen under excessive suction phosphorus, then finally arrange phosphorus by discharging the mode of phosphorus containing sludge.
2), anoxic denitrification section: mainly carry out denitrogenation in anoxic denitrification pond 3, inhale phosphorus and organic matter degradation, waste water 1 enters anoxic denitrification pond 3 after anaerobic reation pool 2, the nitrification liquid 12 also had from aerobic nitrification pond 5 simultaneously entered, active sludge containing polyP bacteria and denitrifying bacteria and zeolite coexist in anoxic denitrification pond 3, stir, make mud in anoxic denitrification pond 3 be suspension flow state; Wherein polyP bacteria inhales phosphorus, and zeolite continues the ammonia nitrogen in absorption waste water 1, and under anoxic conditions, organism utilizes nitrate oxidized degraded removal as electron acceptor(EA) under the effect of denitrifying bacteria, and nitrate, nitrate reductase are become N
2release is discharged; A part of denitrification liquid 13 after anti-nitration reaction and the amount of activated mud of bottom enter aerobic nitrification pond 5, inhale the polyP bacteria after phosphorus and remain denitrification liquid 7 then directly to enter settling tank 4 with all the other active sludge being rich in phosphorus; Inhale before the polyP bacteria after phosphorus and residue denitrification liquid 7 and phosphorous active sludge enter settling tank 4 and first carry out short period of time aeration; The denitrification liquid 13 in anoxic denitrification pond 3 and the active sludge of bottom carry out aeration when entering aerobic nitrification pond 5.
3), aerobic nitrification section: carry out short period of time aeration when the active sludge bottom anoxic denitrification pond 3 enters aerobic nitrification pond 5 to obtain sufficient dissolved oxygen; Mainly in aerobic nitrification pond 5, carry out the nitrated of ammonia nitrogen, under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, and ammonia nitrogen and zeolite desorption, make zeolite regeneration simultaneously;
4), precipitating phase: the residue denitrification liquid 7 in anoxic denitrification pond 3 directly enters settling tank 4, and after leaving standstill for some time, solid-liquid separation, discharges supernatant liquor and obtain SS, BOD
5, TP, nitric nitrogen and ammonia nitrogen be all by the process water 8 highly removed, the active sludge of lower floor is divided three classes: a part is back to anaerobic reation pool 2 for returnedactivatedsludge 9, a part proceeds nitration reaction for residual activity mud 10 through being pumped to aerobic nitrification pond 5, and remaining excess sludge 11 timing discharge system directly carries out processed outward; The phosphorus absorbed in active sludge is got rid of by excess sludge 11.Wherein the volume ratio of returnedactivatedsludge 9 and residual activity mud 10 is 1:1.When excess sludge 11 timing is discharged outside system, in aerobic nitrification tank 5 and anoxic denitrification pond 3, add the modified zeolite 50mg/L that particle diameter is 55 μm.
Nitrification liquid 12 in aerobic nitrification pond 5 after nitration reaction is back in anoxic denitrification pond 3, and the nitrite nitrogen in nitrification liquid 12 and nitre nitrogen are reduced to N by denitrifying bacteria under anoxic conditions
2release is discharged, and the zeolite simultaneously after regeneration continues the ammonia nitrogen in absorption waste water 1; Thereafter, the denitrification liquid 13 after denitrification and base section precipitating sludge enter aerobic nitrification pond 5 again and carry out nitration reaction, form the internal recycle of nitrification-denitrification thus; The return current ratio of the mixed liquid of denitrification liquid 13 is 250%.
Embodiment 3
The waste water quality of water inlet identical with embodiment 1 and concrete experiment condition, run the process water taking settling tank water outlet to obtain after 2 months and again detect.
Concrete technology step is as follows:
1), anaerobic reaction section: mainly carry out releasing phosphorus in anaerobic reation pool 2, waste water 1 containing nitrogen phosphorus enters anaerobic reation pool 2, the returnedactivatedsludge 9 also had from settling tank 4 simultaneously entered, polyP bacteria in returnedactivatedsludge 9 releases phosphorus under anaerobic environment, and the zeolite simultaneously in anaerobic reation pool 2 is by the ammonia nitrogen in adsorption enrichment waste water 1; When not having nitric nitrogen and oxygen, polyP bacteria fully can release phosphorus, stores a large amount of energy substances in vivo, so as follow-up have the condition of oxygen under excessive suction phosphorus, then finally arrange phosphorus by discharging the mode of phosphorus containing sludge.
2), anoxic denitrification section: mainly carry out denitrogenation in anoxic denitrification pond 3, inhale phosphorus and organic matter degradation, waste water 1 enters anoxic denitrification pond 3 after anaerobic reation pool 2, the nitrification liquid 12 also had from aerobic nitrification pond 5 simultaneously entered, active sludge containing polyP bacteria and denitrifying bacteria and zeolite coexist in anoxic denitrification pond 3, stir, make mud in anoxic denitrification pond 3 be suspension flow state; Wherein polyP bacteria inhales phosphorus, and zeolite continues the ammonia nitrogen in absorption waste water 1, and under anoxic conditions, organism utilizes nitrate oxidized degraded removal as electron acceptor(EA) under the effect of denitrifying bacteria, and nitrate, nitrate reductase are become N
2release is discharged; A part of denitrification liquid 13 after anti-nitration reaction and the amount of activated mud of bottom enter aerobic nitrification pond 5, inhale the polyP bacteria after phosphorus and remain denitrification liquid 7 then directly to enter settling tank 4 with all the other active sludge being rich in phosphorus; Inhale before the polyP bacteria after phosphorus and residue denitrification liquid 7 and phosphorous active sludge enter settling tank 4 and first carry out short period of time aeration; The denitrification liquid 13 in anoxic denitrification pond 3 and the active sludge of bottom carry out aeration when entering aerobic nitrification pond 5.
3), aerobic nitrification section: carry out short period of time aeration when the active sludge bottom anoxic denitrification pond 3 enters aerobic nitrification pond 5 to obtain sufficient dissolved oxygen; Mainly in aerobic nitrification pond 5, carry out the nitrated of ammonia nitrogen, under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, and ammonia nitrogen and zeolite desorption, make zeolite regeneration simultaneously;
4), precipitating phase: the residue denitrification liquid 7 in anoxic denitrification pond 3 directly enters settling tank 4, and after leaving standstill for some time, solid-liquid separation, discharges supernatant liquor and obtain SS, BOD
5, TP, nitric nitrogen and ammonia nitrogen be all by the process water 8 highly removed, the active sludge of lower floor is divided three classes: a part is back to anaerobic reation pool 2 for returnedactivatedsludge 9, a part proceeds nitration reaction for residual activity mud 10 through being pumped to aerobic nitrification pond 5, and remaining excess sludge 11 timing discharge system directly carries out processed outward; The phosphorus absorbed in active sludge is got rid of by excess sludge 11.Wherein the volume ratio of returnedactivatedsludge 9 and residual activity mud 10 is 1:1.When excess sludge 11 timing is discharged outside system, in aerobic nitrification tank 5 or anoxic denitrification pond 3, add the modified zeolite 60mg/L that particle diameter is 45 μm.
Nitrification liquid 12 in aerobic nitrification pond 5 after nitration reaction is back in anoxic denitrification pond 3, and the nitrite nitrogen in nitrification liquid 12 and nitre nitrogen are reduced to N by denitrifying bacteria under anoxic conditions
2release is discharged, and the zeolite simultaneously after regeneration continues the ammonia nitrogen in absorption waste water 1; Thereafter, the denitrification liquid 13 after denitrification and base section precipitating sludge enter aerobic nitrification pond 5 again and carry out nitration reaction, form the internal recycle of nitrification-denitrification thus; The return current ratio of the mixed liquid of denitrification liquid 13 is 350%.
Embodiment 4
Through the A of the embodiment of the present invention 1, embodiment 2 and embodiment 3 improvement
2the process of/O denitrification dephosphorization technique is after 2 months, and the process water obtained carries out water quality detection, and water treatment effect is obviously better than traditional A
2/ O denitrification dephosphorization technique, the stable emission request being better than " urban wastewater treatment firm pollutant emission standard " GB18918-2002 primary standard A standard of effluent quality index, the clearance of water outlet total nitrogen and total phosphorus all higher than 90%, total nitrogen≤5mg/L.The water quality situation of the process water wherein obtained after embodiment 1 process is as shown in table 4, and the clearance of total phosphorus and total nitrogen is respectively 96.6% and 92.6% as calculated, and removal effect is obvious.
Table 4 processes the water quality situation of water
| Water-quality guideline | Water temperature (DEG C) | pH | SS(mg/L) | BOD 5(mg/L) | TP(mg/L) | TN(mg/L) | NH 3-N(mg/L) | NO x-N(mg/L) |
| Content | 24 | 7.6 | 5 | 6 | 0.25 | 2.8 | 0.6 | 0.8 |
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a method for waste water high-efficiency biochemical denitrification dephosphorization, is characterized in that: comprise the following steps:
1), anaerobic reaction section: mainly carry out releasing phosphorus in anaerobic reation pool (2), waste water (1) containing nitrogen phosphorus enters anaerobic reation pool (2), the returnedactivatedsludge (9) also had from settling tank (4) simultaneously entered, polyP bacteria in described returnedactivatedsludge (9) fully releases phosphorus under anaerobic environment, and the zeolite simultaneously in anaerobic reation pool (2) is by the ammonia nitrogen in waste water (1) described in adsorption enrichment;
2), anoxic denitrification section: mainly carry out denitrogenation in anoxic denitrification pond (3), inhale phosphorus and organic matter degradation, waste water (1) enters anoxic denitrification pond (3) after anaerobic reation pool (2), the nitrification liquid (12) also had from aerobic nitrification pond (5) simultaneously entered, active sludge containing polyP bacteria and denitrifying bacteria and zeolite coexist in anoxic denitrification pond (3), stir, make mud in anoxic denitrification pond (3) be suspension flow state; Wherein polyP bacteria inhales phosphorus, and zeolite continues the ammonia nitrogen in absorption waste water (1), and under anoxic conditions, organism utilizes nitrate oxidized degraded removal as electron acceptor(EA) under the effect of denitrifying bacteria, and nitrate, nitrate reductase are become N
2release is discharged; A part of denitrification liquid (13) after anti-nitration reaction enters aerobic nitrification pond (5), inhales the polyP bacteria after phosphorus and remain denitrification liquid (7) then directly to enter settling tank (4);
3), aerobic nitrification section: mainly carry out the nitrated of ammonia nitrogen in aerobic nitrification pond (5), under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, and ammonia nitrogen and zeolite desorption, make zeolite regeneration simultaneously;
4), precipitating phase: the residue denitrification liquid (7) of anoxic denitrification pond (3) directly enters settling tank (4), leave standstill, solid-liquid separation, discharge supernatant liquor and obtain process water (8), the active sludge of lower floor is divided three classes: a part is back to anaerobic reation pool (2) for returnedactivatedsludge (9), a part delivers to aerobic nitrification pond (5) for residual activity mud (10), outside excess sludge (11) timing discharge system; The phosphorus absorbed in active sludge is got rid of by excess sludge (11).
2. the method for waste water high-efficiency biochemical denitrification dephosphorization according to claim 1, is characterized in that: in described step 2) in, residue denitrification liquid (7) enters that settling tank (4) is front first carries out aeration.
3. the method for waste water high-efficiency biochemical denitrification dephosphorization according to claim 1, it is characterized in that: in described step 2) in, carry out aeration when the denitrification liquid (13) of anoxic denitrification pond (3) enters aerobic nitrification pond (5).
4. according to the method for the arbitrary described waste water high-efficiency biochemical denitrification dephosphorization of claim 1, it is characterized in that: described step 4) in, the volume ratio of the active sludge (9) being back to anaerobic reation pool (2) and the active sludge (10) delivering to aerobic nitrification pond (5) is 1:1.
5. the method for waste water high-efficiency biochemical denitrification dephosphorization according to claim 1, is characterized in that: the return current ratio of the mixed liquid of described denitrification liquid (13) is 200% ~ 400%.
6. the method for waste water high-efficiency biochemical denitrification dephosphorization according to claim 1, it is characterized in that: in described step 4) in, when excess sludge (11) timing is discharged outside system, in aerobic nitrification tank (5) or anoxic denitrification pond (3), add zeolite.
7. the method for waste water high-efficiency biochemical denitrification dephosphorization according to claim 6, is characterized in that: the magnitude of recruitment of described zeolite is 50 ~ 60mg/L.
8., according to the method for the arbitrary described waste water high-efficiency biochemical denitrification dephosphorization of claim 1 to 7, it is characterized in that: the particle diameter of described zeolite is 45 ~ 55 μm.
9., according to the method for the arbitrary described waste water high-efficiency biochemical denitrification dephosphorization of claim 1 to 7, it is characterized in that: described zeolite is modified zeolite.
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