CN101357815A - EH-BFB biochemical denitrification dephosphorization technique - Google Patents
EH-BFB biochemical denitrification dephosphorization technique Download PDFInfo
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- CN101357815A CN101357815A CNA2008102101872A CN200810210187A CN101357815A CN 101357815 A CN101357815 A CN 101357815A CN A2008102101872 A CNA2008102101872 A CN A2008102101872A CN 200810210187 A CN200810210187 A CN 200810210187A CN 101357815 A CN101357815 A CN 101357815A
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Abstract
The invention relates to a biological treatment method for removing nitrogen and phosphorus of sewage, and the biological treatment method comprises the processes of expansion hydrolysis, pre-denitrification reaction, aerobic reaction, sedimentation and separation, etc. A hydrolysis tank is utilized to replace a traditional tank during the expansion hydrolysis process, a pressure water distributor and a stirring device are further arranged, the biological treatment method does not only have good anaerobic environment and adequate retention time to ensure the phosphorus release, but can also more effectively convey phosphorus accumulating organisms after the full phosphorus release into the aerobic reaction to carry out the phosphorus absorption; suspended biological fillers are added during the aerobic reaction process for forming an aerobic biological fluidized bed, thereby fixing nitrifying bacteria and solving the sludge age contradiction for removing the nitrogen and the phosphorus; at the same time, the fillers form a plurality of micro-A/O nitrogen removal systems, thereby separating microbes with the different sludge ages and also maintaining the simple characteristic of the conventional A<2>/O technology; the biological treatment method does not use the chemical phosphorus removal method and only uses the biological treatment method for solving the contradiction for removing the nitrogen and the phosphorus in the traditional technology and simultaneously achieving the standards that TN is not more than 15mg/L and TP is not more than 0.5mg/L.
Description
Technical field
The present invention relates to a kind of sewage water treatment method, specifically, is a kind of bioremediation that is mainly used in municipal effluent or domestic sewage denitrifying-dephosphorizing.
Background technology
Lake, river surface drainage system is seriously polluted at present, often occurrence of large-area " wawter bloom " phenomenon.Nitrogen and phosphorus content is too high in this and the water body a direct relation.The nitrogen phosphoric flows into water body, the sewage that is mainly derived from undressed municipal effluent and does not have the denitrogenation dephosphorizing effect after treatment.
The process object of municipal sewage plant comprises COD (BOD5), SS and nutritive substances such as nitrogen, phosphorus.With regard to denitrogenation and dephosphorization, because there is certain contradictory relation in the requirement difference of process separately between the two.Use conventional bioremediation, system is difficult to have the denitrogenation dephosphorizing effect simultaneously and makes the water outlet total nitrogen total phosphorus reach the emission standard of national requirements that (water outlet after the processing reaches simultaneously: TN≤15mg/L; TP≤0.5mg/L).
Traditional denitrification dephosphorization technique adopts the bioremediation of " anaerobic-anoxic-aerobic-precipitation ", and its denitrogenation dephosphorizing treatment effect instability and compliance rate are lower.Owing to there is the contradiction of many mutual restriction in the biological denitrification phosphorous removal technique, wherein the control of sludge age is the most outstanding contradiction.As the nitrifier of nitrifying process main body, be characterized in that reproduction speed is slow, generation time is longer, the required mud of nitrification is long age, and nitrifier breeds and is more than the 30d required generation time in the winter time; Even in summer, mud age less than the active sludge of 5d in nitrification also very faint; And polyP bacteria mostly is short microorganism from generation to generation, and the required mud of poly-phosphorus microorganism is very short age, and system still can keep dephosphorization efficiency by using preferably to mud when the 3.0d left and right sides age.Unique channel of biological phosphate-eliminating is to get rid of excess sludge.For the phosphor-removing effect that guarantees system just has to keep higher sludge discharge, the mud of system also has to reduce accordingly age.Obviously nitrifier and polyP bacteria exist contradiction in the mud control in age, if mud is too high age, are unfavorable for the removal of phosphorus; Mud is too low age, and nitrifier can't survive and the mud amount is excessive also can influence follow-up sludge treatment.Denitrification effect is good in same technology, and the phosphorus content in the sewage is generally all greater than 1.0mg/L, and for qualified discharge need add the one-level chemical dephosphorization, sludge quantity increases, and causes secondary pollution.
The present invention adopts a kind of biochemical denitrification dephosphorization technique, not only can solve the mud contradiction in age of above-mentioned denitrification dephosphorization technique, and the biological treatment effect of denitrogenation dephosphorizing can reach TN≤15mg/L simultaneously; The standard of TP≤0.5mg/L.
Summary of the invention
The bioremediation that the purpose of this invention is to provide a kind of sewage denitrification and dephosphorization.
The bioremediation of sewage denitrification and dephosphorization provided by the present invention mainly is to utilize expansion hydrolysis-biological fluidized bed (Expension Hydrolysis-Biological Fluidized Bed, be called for short EH-BFB) biochemical denitrification dephosphorization technique, bioremediation by " expansion hydrolysis-anaerobic-aerobic-precipitation ", after making polyP bacteria in the expansion hydrolytic process, fully release phosphorus, fully inhale phosphorus at aerobic unit, by a large amount of eliminating excess sludges, reach the purpose of dephosphorization; Simultaneously, in the aerobic biochemical pond, add suspended biological filler, form aerobic biological fluid-bed, nitrifier is attached to filling surface, can not run off with mixed-liquor return, so can solve the mud contradiction in age of above-mentioned denitrification dephosphorization technique, and the biological treatment effect of denitrogenation dephosphorizing can reach TN≤15mg/L simultaneously; The standard of TP≤0.5mg/L.
The bioremediation of sewage denitrification and dephosphorization provided by the present invention, it comprises the steps:
1, expansion hydrolysis a: hydrolytic tank is set, be provided with pressure water injection allocator and whipping appts in this hydrolytic tank, after sewage enters hydrolytic tank, under the effect of pressure water injection allocator and whipping appts, the top layer sludge bulking of bottom Sludge Bed is suspended, under anaerobic utilize microorganism that larger molecular organics fully is hydrolyzed to small organic molecule, organonitrogen is converted into ammonia-state nitrogen, and the energy that hydrolysis discharges is released phosphorus for polyP bacteria;
2, Prepositive denitrification reaction a: anoxic pond is set, to anoxic pond, utilizes small organic molecule to be carbon source simultaneously, the NO in the backflow mixed liquor that follow-up aerobic reaction is obtained by denitrifying bacteria through the effluent stream of hydrolytic tank
3 -, NO
2 -Be reduced to N
2Gas, and from the sewage liquid phase, discharge;
3, aerobic reaction: be provided with aerobic fluidized bed, the fixedly floating stuffing of nitrifier is set in described fluidized-bed, effluent stream through anoxic pond is extremely aerobic fluidized bed, under aerobic condition by nitrifier with nitrated generation nitrite nitrogen of ammonia-state nitrogen and nitrate nitrogen, the while majority of organic pollutants is by aerobic degradation or resolve into carbonic acid gas and water, releasing polyP bacteria behind the phosphorus absorbs phosphorus and stores with the form of poly-phosphate, mixed-liquor return to the Prepositive denitrification of part after aerobic reaction is handled reacted, and partially mixed liquid carries out follow-up precipitate and separate;
4, precipitate and separate: a settling tank is set, and the sewage mixed solution after handling through aerobic reaction carries out solid-liquid separation at settling tank, and supernatant liquor is discharged, and the mud of partly precipitated is back to front end hydrolytic tank and anoxic pond, and excess sludge drains into sludge treating system.
In the above-mentioned sewage treatment process, step 1 sewage pumps into hydrolytic tank by promoting water pump; The amount of step 3 mixed-liquor return and discharge is 1-3 by volume: 1; Step 4 is back to hydrolytic tank and the mud and the precipitating sludge that are back in the anoxic pond are 0.25-0.5 by volume: 1.
The expansion hydrolysis occurs in hydrolytic tank, and it constitutes: steel reinforced concrete pool body, pressure water injection allocator, water distributing pipe, water distribution head, spoil disposal scum pipe, mud whipping appts (sludge bulking device), rising pipe.
The bottom center of pressure water injection allocator is provided with water inlet pipe, regular or distribution pressure titting water outlet irregularly around the water inlet pipe, and be connected with multidirectional water distribution head by the pressure water distributing pipe, multidirectional water distribution head inserts the sludge blanket at the bottom of the pond, disposes sealing cover at the top of pressure water injection allocator.Water intake velocity was greater than the gravity feed bottom velocity bottom this device made in the pond, thereby make Chi Dibushui even, again in conjunction with the stirring of whipping appts, sludge blanket is stirred picking-up, form bulking sludge, can avoid top, side, bottom sludge blockage, the mixing of the mud that help hydrolysis one acidification bacteria in Yuan Shui and the pond, the oxygen bacterium of holding concurrently, anaerobic bacterium forms contacts.
The function of hydrolytic tank is: the fine suspension in the water inlet of interception sewage and the precipitation tiny grains of sand heavier than water, play the effect of preliminary sedimentation tank.The main purpose of its application is to utilize the anaerobic reaction hydrolysis, produce the acidication bacterium of acid phase, to the fine particle thing in the sewage, macromole long-chain organism and some are difficult for being decomposed by biodegradable material, hydrolysis, the product that produces acid phase is mainly micromolecular organism, it is an organic acid, alcohols, in alkanes or the benzoic acid salt one or more, as formic acid, acetate, the material that methyl alcohol etc. are easily utilized by microorganism, biological degradability is generally better, change the biodegradability of raw waste water, make sewage be more suitable for follow-up aerobic treatment, thereby reduce the energy consumption of follow-up aerobic reaction time and processing, save disposable initial cost and working cost.In hydrolytic tank, also has the function that organonitrogen is converted into ammonia-state nitrogen, particularly at the decomposition of amino acid, urea in a large number in the slop in the sanitary sewage, make that organonitrogen shifts to an earlier date ammonification in the sewage, help follow-up aerobic treatment, reduce the consumption of the follow-up aerobic process residence time and oxygen, further saved one-time investment and working cost; PolyP bacteria is released phosphorus in a large number in the hydrolysis anaerobic environment, and in hydrolysis (acidifying) process, organic pollutant has produced a large amount of voltaile fatty acids under the effect of hydrolysis acid-producing bacteria, this to anaerobic reaction in the stage polyP bacteria to discharge phosphorus very favourable.
The operational conditions of expansion hydrolysis is: water temperature 13-25 ℃, pH value 6.0-8.0, dissolved oxygen DO＜0.2mg/L, dwell time of sewage are 2.5-3.5h.
The Prepositive denitrification reaction occurs in anoxic pond, and it constitutes: steel reinforced concrete pool body, whipping appts, water inlet pipe, rising pipe.
The function of anoxic pond is: remove the total nitrogen in the sewage.
Principle: in denitrification process, through the aerobic reaction process, most of ammonia-state nitrogens are converted into NO through nitration reaction
3-, NO
2-, under the condition that has hydrogen supply body (organic carbon source) and DO to go to zero, denitrifying bacteria is with NO
3-, NO
2-Be reduced to N
2Gas is discharged from the liquid phase of sewage, and the system of reaching removes the purpose of total nitrogen.Is that the concrete reaction formula of example is as follows with methyl alcohol as carbon source:
6NO
3-+2CH
3OH→NO
2-+2CO
2+4H
2O (1)
6NO
2-+3CH
3OH→3N
2↑+3CO
2+3H
2O+6OH
- (2)
Net reaction (1)+(2)
6NO
3-+5CH
3OH→3N
2↑+5CO
2+7H
2O+6OH
- (3)
Can have as the carbon source of denitrification process: carbohydrate, organic acid, alcohols, alkanes, benzoic acid salt etc., these compounds often all are the main components in the sewage.Therefore, anoxic pond is arranged on the aerobic unit front end, to anoxic pond, this process is referred to as the Prepositive denitrification process with the sewage backflow after nitrated.Can utilize BOD in the sewage as carbon source, its denitrification process can be represented with following formula:
5C (organic carbon)+H
2O+4NO
3-→ 2N
2↑+5CO
2+ 4OH
-(4)
Can calculate reduction 1kg NO by reaction formula
3-N is N
2, consume CH
3OH2.47kg; Produce 3.57kg basicity (with CaCO
3Meter), produce 0.45kgVSS (new cell).Be it can also be seen that by formula (4): 1. denitrification process has also improved basicity simultaneously, has partly replenished the basicity that digests in the nitrifying process; 2. to consume certain organic carbon source, can be with the BOD in the sewage, when ratio≤3 of BOD and total triumphant formula nitrogen TKN, need additional carbon.
The operational conditions of Prepositive denitrification reaction is: water temperature 15-35 ℃, pH value 6.5-8.0, dissolved oxygen DO＜0.5mg/L, BOD/TKN＞3.
Aerobic reaction occurs in aerobic biological fluid-bed, and it constitutes: steel reinforced concrete pool body, water inlet pipe, gas blower (being positioned in the Ventilator Room), aeration tube, aeration head, biologic packing material, rising pipe.
Added suspended biological filler in the biochemistry pool of aerobic reaction, formed aerobic biological fluid-bed.Suspended biological filler is the interspersed built-up type sphere of multi-disc, and the part sheet is made the flap pattern, to increase specific surface area; It has eccentric structure, can be used for the seizure to microorganism in welter under the effect of gas, water and gravity.This filler has higher " catch rate " to the microorganism in the sewage; Help the contact of gas, liquid, solid three-phase medium, avoid producing the aeration dead angle, gas is produced repeatedly cutting, improve the utilization ratio of oxygen; It has bigger surface-area and voidage, and theoretical specific surface area is consistent with the actual specific surface-area, and phenomenons such as mud nodule do not take place; In major ingredient, be equipped with the hydrophilic group auxiliary material, changed starting material surface wetting ability, be beneficial to organism in its surface growth breeding; Epontic microbial film uniform and thin, keep air permeability and good, aged microbial film easily to come off and precipitation threshold good; Need not support, simplify design, installation and operational management operation; More accurate than recompounding, in servicely can evenly spread all over whole pond body; Can change filler size according to the different requirements of different steps; And can require to increase and decrease loading level at any time according to different load, reduce unnecessary investment.
Aerobic biological fluid-bed function is: ammonia nitrogen in degradable organic pollutant, the removal sewage and the phosphorus in the absorption sewage.
In the entire sewage treating processes, aerobic unit is of paramount importance core.Sewage is by aerobic treatment, and majority of organic pollutants (carbon) is degraded, resolves into carbonic acid gas and water; Ammonia-state nitrogen generates nitrite nitrogen, nitrate nitrogen by nitration reaction under aerobic condition.Its nitration reaction formula is as follows:
NH
4 ++ 1.5O
2→ 2NO
2-+ H
++ H
2O+ energy (5)
NO
2-+ 0.5O
2→ 2NO
3-+ energy (6)
Net reaction: (5)+(6)
NH
4 ++ O
2→ NO
3-+ 2H
++ 2H
2O+ energy (7)
By formula (7) as can be seen, 1kg NH
4 +-N is oxidized to NO
3-N needs 4.6kgO
2
PolyP bacteria absorb to surpass the required phosphorus of its growth and stores with the form of poly-phosphate from sewage under aerobic environment, by the discharging excess sludge, also will be discharged system with mud by the phosphorus of bacterium excess ingestion, thereby can obtain goodish phosphor-removing effect.
The operational conditions of aerobic reaction: water temperature 15-35 ℃, pH value 8.0-8.3, residue total alkalinity are with CaCO
3Meter is more than or equal to 100mg/L, and dissolved oxygen DO is that 2-3mg/L, dwell time of sewage are 6-10h, and sludge age is 3-5d.
The precipitate and separate process occurs in settling tank, and it constitutes: steel reinforced concrete pool body, water inlet pipe, slag scraper, effluent weir, rising pipe, shore pipe.
The function of settling tank is: sewage mixed solution is after treatment carried out solid-liquid separation.Supernatant liquor qualified discharge or carry out advanced treatment, activity sludge reflux is to front end, and excess sludge drains into sludge treating system and carries out treatment and disposal.
Wherein, the method for advanced treatment is flocculent precipitation, sand filtration method, activated carbon method, ozone oxidation method, membrane separation process, ion exchange method, electrolysis treatment, wet oxidation process or evaporation concentration method.
The bioremediation of sewage denitrification and dephosphorization provided by the invention, its advantage is:
1, utilize hydrolytic tank to replace traditional anaerobic pond, not only have good anaerobic environment also have the competent residence time guarantee to release phosphorus (generally for residence time of the anaerobic pond of reducing investment outlay about 1.5 hours, and hydrolytic tank is 2.5-3.5 hour).
2, in traditional static hydrolysis process, whipping appts is set forms bulking sludge, except the original function that has followed hydrolysis, also can send into aerobic unit and inhale phosphorus fully releasing polyP bacteria behind the phosphorus, effect has surpassed simple anaerobic pond.
3, in the aerobic biochemical pond, added suspended biological filler, formed aerobic biological fluid-bed.Because Nitrobacter attached type microorganism inhabits filling surface, can not run off with mixed-liquor return, so can solve the mud contradiction in age of denitrification dephosphorization technique.Simultaneously can self form many miniature A/O denitrification systems on filler, the advantage of this practice is both to have reached the purpose of separating different mud microorganisms in age, has kept conventional A again
2The simple and direct characteristics of/O technology.
4, without chemical dephosphorization, only, solved the contradiction of denitrogenation-dephosphorization in the traditional technology by bioremediation, reach TN≤15mg/L simultaneously; The standard of TP≤0.5mg/L.
Description of drawings
Fig. 1 is the schema of sewage denitrification and dephosphorization bioremediation of the present invention.
Fig. 2 is traditional A
2The schema of/O technology nitrogen and phosphorus removal bio treatment process;
Wherein: A1 is an anaerobic pond; A2 is an anoxic pond.
Embodiment
Following examples further specify content of the present invention, but should not be construed as limitation of the present invention.Without departing from the spirit and substance of the case in the present invention, modification or replacement to the inventive method, step or condition are done all belong to scope of the present invention.
Embodiment 1
1, experimental scale: Q=3.6m
3/ d.
2, analytical instrument and analytical procedure:
COD, BOD5, total alkalinity, SVI, SV, MLSS all adopt the state specified standards method to measure.
TN, NH
4 +-N, NO
3 --N, NO
2 --N, TP adopt the HANNA Water Test Kits to measure.
Water temperature, DO adopt the JPB-607 dissolved oxygen meter to measure.
PH value, ORP adopt the pHB-4pH instrumentation fixed.
3, test influent quality: above village biotope sewage effluent and area, hot spring Tai Zhou depressed place sewage effluent are the former water source of test, and sewage raw water quality test result is as shown in table 1:
Table 1 test raw water quality
| Project | COD (mg/L) | BOD5 (mg/L) | TN (mg/L) | NH 4 +-N (mg/L) | TP (mg/L) | SS (mg/L) | Basicity (mg/L) | Water temperature ℃ | pH |
| Scope | 250-450 | 150-260 | 36-60 | 35-58 | 3.5-6.5 | 100-250 | 300-400 | 18-30 | 6-8 |
| Mean value | 345 | 160 | 50 | 40 | 4.8 | 175 | 350 | 26 | 7.3 |
4, sewage treatment process
(1) expansion hydrolysis: above-mentioned sewage is by promoting water pump with 0.15m
3After the flow pump of/h is gone into hydrolytic tank, under the effect of pressure water injection allocator and whipping appts, bottom skin sludge bulking is suspended, under the condition of 18 ℃ of water temperatures, pH value 6.6, dissolved oxygen DO＜0.2mg/L, sewage stops 3.5h, utilize microorganism that larger molecular organics fully is hydrolyzed to small organic molecule, organonitrogen is converted into ammonia-state nitrogen, and the energy that hydrolysis discharges is released phosphorus for polyP bacteria.
(2) Prepositive denitrification reaction: through the effluent stream of hydrolytic tank to anoxic pond, under the condition of 17 ℃ of water temperatures, pH value 7.0, dissolved oxygen DO＜0.5mg/L, BOD/TKN＞3, utilize small organic molecule to be carbon source, the NO in the backflow mixed liquor that follow-up aerobic reaction is obtained by denitrifying bacteria
3 -, NO
2 -Be reduced to N
2Gas, and from the sewage liquid phase, discharge.
(3) aerobic reaction: through the effluent stream of anoxic pond to aerobic fluidized bed, in 25 ℃ of water temperatures, pH value 8.0, remain total alkalinity with CaCO
3Count 100mg/L, dissolved oxygen DO is that 2.5mg/L, sewage stop 8h, sludge age is under the condition of 4d, by nitrifier with nitrated generation nitrite nitrogen of ammonia-state nitrogen and nitrate nitrogen, the while majority of organic pollutants is by aerobic degradation or resolve into carbonic acid gas and water, release polyP bacteria behind the phosphorus and absorb phosphorus and store, with 0.3m with the form of poly-phosphate
3Mixed solution after the flow of/h is handled aerobic reaction is partly refluxed to the Prepositive denitrification reaction, with 0.15m
3The flow of/h carries out follow-up precipitate and separate with partially mixed liquid.
(4) precipitate and separate: carry out solid-liquid separation through the sewage mixed solution after the aerobic reaction processing at settling tank, supernatant liquor is discharged, and the sedimentary mud with 75% is back to front end hydrolytic tank and anoxic pond, and excess sludge drains into sludge treating system.
5, test effluent quality: this test effluent quality target is the one-level A standard of national standard " urban wastewater treatment firm pollutant emission standard " in (GB18918-2002).Main water-quality guideline and effluent quality measurement result are as shown in table 2:
Table 2 " urban wastewater treatment firm pollutant emission standard " one-level A standard and test effluent quality
| Project | COD (mg/L) | BOD5 (mg/L) | TN (mg/L) | NH4 +-N (mg/L) | TP (mg/L) | SS (mg/L) |
| Emission standard | 50 | 10 | 15 | 5(8) | 0.5 | 10 |
| Actual water outlet | 26 | 6.9 | 7.3 | 0.84 | 0.5 | 6.2 |
6, conclusion
Utilize the bioremediation of sewage denitrification and dephosphorization of the present invention, solved the contradiction of denitrogenation-dephosphorization in the traditional technology, reach TN≤15mg/L simultaneously; The standard of TP≤0.5mg/L.
Embodiment 2
1, experimental scale: Q=4000m
3/ d.
2, analytical instrument and analytical procedure:
COD, BOD5, total alkalinity, SVI, SV, MLSS all adopt the mark of national regulation
Accurate method is measured.
TN, NH
4 +-N, NO
3 --N, NO
2 --N, TP adopt the HANNA Water Test Kits to measure.
Water temperature, DO adopt the JPB-607 dissolved oxygen meter to measure.
PH value, ORP adopt the pHB-4pH instrumentation fixed.
3, sewage water treatment method of the present invention is implemented in the engineering design construction of hot spring town, Haidian District Tai Zhou depressed place sewage work, and sewage raw water quality test result is as shown in table 3:
Table 3 test raw water quality
| Project | COD (mg/L) | BOD 5 (mg/L) | TN (mg/L) | NH 4 +-N (mg/L) | TP (mg/L) | SS (mg/L) | Basicity (mg/L) | Water temperature ℃ | pH |
| Scope | 150-250 | 75-150 | 36-60 | 35-58 | 3.5-6.5 | 100-250 | 300-400 | 10-30 | 6-8 |
| Mean value | 200 | 100 | 50 | 40 | 4.8 | 175 | 350 | 23 | 7.4 |
4, sewage treatment process
(1) expansion hydrolysis: above-mentioned sewage is by promoting water pump with 166m
3After the flow pump of/h is gone into hydrolytic tank, under the effect of pressure water injection allocator and whipping appts, bottom skin sludge bulking is suspended, under the condition of 15 ℃ of water temperatures, pH value 6.5, dissolved oxygen DO＜0.2mg/L, sewage stops 3.5h, utilize microorganism that larger molecular organics fully is hydrolyzed to small organic molecule, organonitrogen is converted into ammonia-state nitrogen, and the energy that hydrolysis discharges is released phosphorus for polyP bacteria.
(2) Prepositive denitrification reaction: through the effluent stream of hydrolytic tank to anoxic pond, under the condition of 15 ℃ of water temperatures, pH value 7.0, dissolved oxygen DO＜0.5mg/L, BOD/TKN＞3, utilize small organic molecule to be carbon source, the NO in the backflow mixed liquor that follow-up aerobic reaction is obtained by denitrifying bacteria
3 -, NO
2 -Be reduced to N
2Gas, and from the sewage liquid phase, discharge.
(3) aerobic reaction: through the effluent stream of anoxic pond to aerobic fluidized bed, in 22 ℃ of water temperatures, pH value 8.0, remain total alkalinity with CaCO
3Count 100mg/L, dissolved oxygen DO is that 2.5mg/L, sewage stop 9h, sludge age is under the condition of 4d, by nitrifier with nitrated generation nitrite nitrogen of ammonia-state nitrogen and nitrate nitrogen, the while majority of organic pollutants is by aerobic degradation or resolve into carbonic acid gas and water, release polyP bacteria behind the phosphorus and absorb phosphorus and store, with 300m with the form of poly-phosphate
3Mixed solution after the flow of/h is handled aerobic reaction is partly refluxed to the Prepositive denitrification reaction, with 166m
3The flow of/h carries out follow-up precipitate and separate with partially mixed liquid.
(4) precipitate and separate: carry out solid-liquid separation through the sewage mixed solution after the aerobic reaction processing at settling tank, supernatant liquor is discharged, and the sedimentary mud with 70% is back to front end hydrolytic tank and anoxic pond, and excess sludge drains into sludge treating system.
5, test effluent quality: this test effluent quality target is the one-level A standard of national standard " urban wastewater treatment firm pollutant emission standard " in (GB18918-2002).Main water-quality guideline and effluent quality measurement result are as shown in table 2:
Table 4 " urban wastewater treatment firm pollutant emission standard " one-level A standard and test effluent quality
| Project | COD (mg/L) | BOD 5 (mg/L) | TN (mg/L) | NH 4 +-N (mg/L) | TP (mg/L) | SS (mg/L) |
| Emission standard | 50 | 10 | 15 | 5(8) | 0.5 | 10 |
| Actual water outlet | 22 | 4.2 | 13.2 | 2.8 | 0.5 | 4.3 |
6, conclusion
Utilize the bioremediation of sewage denitrification and dephosphorization of the present invention to be implemented in the engineering design construction of hot spring town, Haidian District Tai Zhou depressed place sewage work, its denitrogenation dephosphorizing effect reaches TN≤15mg/L simultaneously; The standard of TP≤0.5mg/L.
Claims (8)
1, a kind of bioremediation of sewage denitrification and dephosphorization is characterized in that, comprises the steps:
(1) expansion hydrolysis a: hydrolytic tank is set, be provided with pressure water injection allocator and whipping appts in this hydrolytic tank, after sewage enters hydrolytic tank, under the effect of pressure water injection allocator and whipping appts, the top layer sludge bulking of bottom Sludge Bed is suspended, under anaerobic utilize microorganism that larger molecular organics fully is hydrolyzed to small organic molecule, organonitrogen is converted into ammonia-state nitrogen, and the energy that hydrolysis discharges is released phosphorus for polyP bacteria;
(2) Prepositive denitrification reaction a: anoxic pond is set, to anoxic pond, utilizes small organic molecule to be carbon source simultaneously, the NO in the backflow mixed liquor that follow-up aerobic reaction is obtained by denitrifying bacteria through the effluent stream of hydrolytic tank
3 -, NO
2 -Be reduced to N
2Gas, and from the sewage liquid phase, discharge;
(3) aerobic reaction: be provided with aerobic fluidized bed, the fixedly floating stuffing of nitrifier is set in described fluidized-bed, effluent stream through anoxic pond is extremely aerobic fluidized bed, under aerobic condition by nitrifier with nitrated generation nitrite nitrogen of ammonia-state nitrogen and nitrate nitrogen, the while majority of organic pollutants is by aerobic degradation or resolve into carbonic acid gas and water, releasing polyP bacteria behind the phosphorus absorbs phosphorus and stores with the form of poly-phosphate, mixed-liquor return to the Prepositive denitrification of part after aerobic reaction is handled reacted, and partially mixed liquid carries out follow-up precipitate and separate;
(4) precipitate and separate: a settling tank is set, and the sewage mixed solution after handling through aerobic reaction carries out solid-liquid separation at settling tank, and supernatant liquor is discharged, and the mud of partly precipitated is back to front end hydrolytic tank and anoxic pond, and excess sludge drains into sludge treating system.
2, bioremediation as claimed in claim 1 is characterized in that, step (1) sewage pumps into hydrolytic tank by promoting water pump; The amount of step (3) mixed-liquor return and discharge is 1-3 by volume: 1; Step (4) is back to hydrolytic tank and the mud and the precipitating sludge that are back in the anoxic pond are 0.25-0.5 by volume: 1.
3, bioremediation as claimed in claim 1 is characterized in that, described suspended biological filler is the interspersed built-up type sphere of multi-disc, and the part sheet is made the flap pattern, to increase specific surface area; It has eccentric structure, can be used for the seizure to microorganism in welter under the effect of gas, water and gravity.
4, as the arbitrary described bioremediation of claim 1-3, it is characterized in that the operational conditions of described expansion hydrolytic process is: water temperature 13-25 ℃, pH value 6.0-8.0, dissolved oxygen DO＜0.2mg/L, dwell time of sewage are 2.5-3.5h.
5, as the arbitrary described bioremediation of claim 1-3, it is characterized in that the operational conditions of described pre-denitrification and denitrogenation process is: water temperature 15-35 ℃, pH value 6.5-8.0, dissolved oxygen DO＜0.5mg/L, BOD/TKN＞3.
6, as the arbitrary described bioremediation of claim 1-3, it is characterized in that the operational conditions of described aerobic reaction process is: water temperature 15-35 ℃, pH value 8.0-8.3, residue total alkalinity are with CaCO
3Meter is more than or equal to 100mg/L, and dissolved oxygen DO is that the residence time of 2-3mg/L, sewage is 6-10h, and sludge age is 3-5d.
7, as the arbitrary described bioremediation of claim 1-3, it is characterized in that the method for the advanced treatment of described precipitate and separate process is flocculent precipitation, sand filtration method, activated carbon method, ozone oxidation method, membrane separation process, ion exchange method, electrolysis treatment, wet oxidation process or evaporation concentration method.
As the arbitrary described bioremediation of claim 1-3, it is characterized in that 8, the product small organic molecule of described expanded hydrolysis is one or more in organic acid, alcohols, alkanes or the benzoic acid salt.
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