CN102730832B - ALOAO double-sludge circulation synchronic denitrification and phosphorus removing process, operation method thereof, and employed biological reaction tank - Google Patents
ALOAO double-sludge circulation synchronic denitrification and phosphorus removing process, operation method thereof, and employed biological reaction tank Download PDFInfo
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Abstract
The invention relates to an ALOAO double-sludge circulation synchronic denitrification and phosphorus removing process. According to the invention, first, pre-treated sludge is delivered into an anaerobic tank; sludge-water separation is carried out in a first sedimentation tank; an obtained supernatant is delivered into a hypoxic reaction tank; sludge obtained by sedimentation in the first sedimentation tank is directly delivered into an anoxic tank, and is mixed with the liquid discharged from the hypoxic reaction tank; the mixture is delivered into a short-time aerobic tank, and is than delivered into a second sedimentation tank; an obtained supernatant is discharged, and a part of the sludge obtained by sedimentation is delivered back to the anaerobic tank; and the rest of the sludge is discharged as residual waste sludge. According to the invention, mixed liquid reflux is designed on the path from the short-time aerobic tank to the hypoxic reaction tank, and the reflux ratio is set according to requirements. The process and the operation control method provided by the invention have relatively broad adaptability to sewage qualities. The method can be used for removing nitrogen and phosphorus with low carbon source and low consumption on oxygen. Therefore, the method is suitable for the reformation and construction of municipal wastewater treatment plants with requirements on nitrogen and phosphorus removing.
Description
Technical field:
The invention belongs to field of environment engineering technology, be particularly related to the two mud circulation synchronous denitrification dephosphorization techniques of a kind of ALOAO, this technique is applicable to the removal of nitrogen phosphorus in town sewage, the particularly removal of nitrogen phosphorus under low carbon source condition, the water outlet of " urban wastewater treatment firm pollutant emission standard " one-level A satisfied with to obtain or more maximum discharge standard.
Background technology:
For the anti-pollution of harnessing the river, administer water surrounding, China has put into effect multinomial policy, rule and standard in succession nearly ten years, more and more tighter to the requirement of sewage disposal and discharge thereof." urban wastewater treatment firm pollutant emission standard " GB18918-2002 of issuing and implementation in 2002 has proposed stricter requirement to the index of nitrogen, phosphorus, wherein the water outlet of one-level A standard-required reaches: total nitrogen≤15mg/L, ammonia nitrogen≤5mg/L, total phosphorus≤0.5mg/L, this just means that most built urban wastewater treatment firms need to increase the transformation of dephosphorization denitrogenation function; Nearly all newly-built urban wastewater treatment firm all will have dephosphorization denitrogenation function.Some in major river valley or the urban wastewater treatment firm in the region emission standard that may require higher.
Adopting biologic treating technique to process waste water is a kind of effective and economic method.Have more than 90 year historical activated sludge process is the main flow technique of biological wastewater treatment always.Over nearly 20 years, owing to controlling the needs of body eutrophication, activated sludge process is from traditional to remove carbonaceous organic material as object, and developing and develop into remove carbonaceous organic material and phosphorus and nitrogen is target.The requirement of denitrogenation dephosphorizing function has promoted the development of active sludge law theory and Technology.Anaerobic/anoxic/aerobic (A/A/O) technique is typical dephosphorization and denitrification process, on its basis, for some defects of different Inlet and outlet water water quality and the existence of this technique, various countries comprise that China has researched and developed multiple improvement dephosphorization and denitrification process, as Bardenpho technique, UCT technique, VIP technique etc.These techniques based on theory the demand of carbon source is separated dephosphorization process, independently with denitrification process, the release that is phosphorus needs carbon source, denitrification process also needs carbon source, and this just requires will have sufficient carbon source to meet respectively the needs of dephosphorization and denitrogenation in treatment system.Along with the discovery of Denitrifying Phosphate Accumulating Organisms (DPB), the excessive absorption process of denitrification and phosphorus can complete by the metabolism of DPB simultaneously, makes originally to need carbon source to carry out denitrifying NO
3 -be used as and inhale electron acceptor(EA) utilization in phosphorus process, thereby reach the functional effect that denitrogenation completes with dephosphorization under the condition that does not need carbon source simultaneously.Equally, dephosphorization can utilize NO under the condition without dissolved oxygen (DO)
3 -complete.Therefore, denitrifying phosphorus removal technique is low to the more traditional dephosphorization and denitrification process of the demand of carbon source and oxygen, and the raw waste water of low C/N ratio is had to better adaptability.According to the statistical study to China's urban wastewater treatment firm influent quality data, most of sewage treatment plant inflow organic concentration is on the low side, particularly BOD
5on the low side, majority faces the problem of carbon source deficiency.Approximately 70% Sewage Plant influent COD
crbetween 200～400mg/L; BOD
5/ TN ratio is less than 3.0, obvious on the low side 15%, the BOD that accounts for
5/ TN ratio between 3.0～5.0, not bery sufficient account for 58%, 27% Sewage Plant carbon source abundance, BOD only have an appointment
5/ TN ratio is greater than 5.0.Therefore, transformation and the construction of the application of denitrification dephosphorization theory and technique to China's urban wastewater treatment firm has larger realistic meaning and practical value.
Activated sludge process denitrification dephosphorization denitrification technique has dividing of single mud and two sludge systems.At present, typical two sludge systems mainly contain DEPHANOX technique.But in this technique practical application, be faced with some problems: one, rely on denitrification dephosphorization completely.Quantity research shows greatly, and the dephosphorization efficiency by using under anoxia condition is lower than the dephosphorization efficiency by using under aerobic condition.And the removal effect of phosphorus depends on the concentration of nitrate in anoxic pond to a great extent, nitrate content is lower, inhales phosphorus efficiency lower, can make the excess picked-up of phosphorus restricted in the time that anoxic pond nitrate is not enough; Otherwise the nitrate content that enters anaerobic pond with returned sluge is too high, can disturb again release and the synthetic PHB of polyP bacteria phosphorus, the TN of water outlet simultaneously also may exceed standard.The ratio of nitrogen and phosphorus of intaking in practical application is to be difficult to just to meet anoxic take the photograph the requirement of phosphorus and make water outlet up to standard, and this brings difficulty to control of system; Two, the absorption for phosphorus of the carbon source in water inlet, the carbon source of not inhaled phosphorus reaction utilization by anaerobism is all by aerobic oxidation, can not utilize but the available degradation of organic substances at a slow speed of denitrification denitrogenation has not only increased aeration rate but also sacrificed denitrification denitrogenation comprising inhaling phosphorus reaction.Even if rely on denitrification dephosphorization can make the removal of nitrogen obtain a good equilibrium level, but in practical application, be difficult to ensure in water inlet that the ratio between biodegradable organic, nitrogen, phosphorus is just in time in optimum value.In fact, the fluctuation of urban wastewater treatment firm influent quality is larger, has rainy season and dry season, different season and month, 24 hours every days larger variation.Current technique obviously can not adapt to; Three, in biofilm reactor with high-solubility oxygen by the denitrification dephosphorization affecting in anoxic pond, DO is preferentially utilized by polyP bacteria, the removal of nitrogen is affected.
Summary of the invention:
The object of the invention is for the problems referred to above and the deficiencies in the prior art, the two mud circulation synchronous denitrification dephosphorization techniques of a kind of ALOAO are provided, this technique and progress control method have more wide in range adaptability, be that a kind of low carbon source and low oxygen consumption are gone down except the method for nitrogen phosphorus in sewage sewage quality, is applicable to nitrogen phosphorus and removes the transformation of urban wastewater treatment firm of demand and newly-built.
Another object of the present invention is to provide above-mentioned technique biological reaction tank used.
As above design, technical scheme of the present invention is: the two mud circulation synchronous denitrification dephosphorization techniques of a kind of ALOAO, it is characterized in that: first sewage after pretreatment enter anaerobic pond, carry out mud-water separation in settling tank one after, supernatant liquor enters hypoxemia reaction tank, the mud being settled out in settling tank one directly enters anoxic pond, mix with the flow liquid that goes out of hypoxemia reaction tank, then enter Aerobic Pond in short-term, the most laggard settling tank two, supernatant liquor is discharged, the mud partial reflux being settled out is to anaerobic pond, and part is discharged with excess sludge; Be provided with mixed-liquor return from Aerobic Pond in short-term to hypoxemia pond, reflux ratio is determined according to need.
The operation method of above-mentioned technique is: when C/N is than high, BOD
5/ TN ratio is greater than 5.0, if TN is high, from 100%～200% increasing r, if TN is low,, to reach the maximum denitrification dephosphorization efficiency of system as target, reduces r; When C/N is than medium, BOD
5/ TN ratio between 3.5～5.0 time, taking denitrification dephosphorization as main, regulates r from 0～100%; When C/N is than low, BOD
5/ TN ratio is less than at 3.5 o'clock, taking denitrification dephosphorization as main, if to release the requirement TN of phosphorus higher though carbon source can meet, can regulate r from 0～200%.
The biological reaction tank that above-mentioned technique is used, is characterized in that: adopt the circular groove type reaction tank structure of nested type, outer fissure is hypoxemia reaction tank, and middle ditch is hypoxia response pond, and septal fossula is aerobic reaction pond; Outer fissure is provided with filler, and middle ditch is provided with partition wall, and septal fossula is provided with the mixed-liquor return passage to outer fissure.
Above-mentioned anaerobic pond adopts push flowing, hydraulic detention time HRT0.7～1h.
Above-mentioned hypoxemia pond adopts adhere to/suspension type activated sludge reaction pond, and filler is set in reaction tank, can be suspension type filler, can be also suspension type flexibility or elastic filler, HRT4～5h.
Above-mentioned anoxic pond adopts push flowing, HRT2～3h.
HRT1～the 2h of above-mentioned Aerobic Pond, DO is controlled at 2mg/L.
Principle of the present invention is that denitrification dephosphorization is combined with traditional nitration denitrification, in making full use of denitrification dephosphorization effect removal phosphor in sewage, nitrogen, not exclusively abandons denitrification denitrogenation and aerobic dephosphorization that efficiency is higher.Meanwhile, by the setting of two sludge reflux systems, be respectively dephosphorization and nitrated two processes provide optimal conditions, solve the contradiction that traditional denitrogenation and dephosphorization are controlled at mud age, obtain all higher water outlets of nitrogen and tp removal rate simultaneously.
The present invention has following advantage and positively effect:
1. make full use of but and not exclusively rely on denitrification dephosphorization and obtain the removal of nitrogen and phosphorus, make technique both reduce the demand to carbon source, kept again higher denitrogenation dephosphorizing efficiency, water outlet fraction up to standard improves greatly;
2. be suitable for influent quality scope wide, change of water quality is had to stronger adaptability, operation is controlled simple, and flexible adjustment is easy, takes simple regulation and control can reach effect of optimization;
3. make full use of carbon source denitrogenation more than needed after anaerobic phosphorus release, adopt the design of Simultaneous Nitrification denitrification, nitrification and denitrification is realized in same reactor, has simplified flow process, has saved nitrification liquid backflow energy consumption;
4. investment and working cost are saved.
Brief description of the drawings:
Fig. 1 is process flow sheet of the present invention;
Fig. 2 is the structural representation of biological reaction tank.
Embodiment:
As shown in Figure 1: the two mud circulation synchronous denitrification dephosphorization techniques of a kind of ALOAO, first sewage after pretreatment enter anaerobic pond, carry out mud-water separation in settling tank one after, supernatant liquor enters hypoxemia reaction tank, the mud being settled out in settling tank one directly enters anoxic pond, mixes with the flow liquid that goes out of hypoxemia reaction tank, then enters Aerobic Pond in short-term, the most laggard settling tank two, supernatant liquor is discharged, and the mud partial reflux being settled out is to anaerobic pond, and part is discharged with excess sludge; Be provided with mixed-liquor return from Aerobic Pond in short-term to hypoxemia pond, reflux ratio is determined according to need.
Each reaction tank form, significant parameter and function are described below:
Anaerobic pond: adopt push flowing, hydraulic detention time (HRT) 0.7～1h, the release of phosphorus.
Settling tank one: mud-water separation, create and optimize the environment to DPB, make DPB directly utilize NO in anoxic pond
3 -inhale phosphorus effect; Proceed the release of phosphorus.
Hypoxemia pond: adopting adhere to/suspension type activated sludge reaction pond, certain proportion filler is set in reaction tank, can be suspension type filler, can be also suspension type flexibility or elastic filler.Owing to being low-oxygen environment (controlling DO < 0.5mg/L), can there is Simultaneous Nitrification denitrification, part nitrogen is removed at this.HRT4～5h, nitrification and denitrification denitrification reaction mainly completes at this.
Anoxic pond: adopt push flowing, HRT2～3h, denitrifying phosphorus uptake, dephosphorization.
Aerobic Pond: HRT1～2h, DO is controlled at 2mg/L left and right, aerobic suction phosphorus, dephosphorization, nitration reaction.
Settling tank two: mud-water separation, the mud of high content of phosphorus is discharged.
This technique, according to the different and variation of influent quality, has multiple design and running to regulate pattern:
1, C/N than high (as TN clearance 70% require under BOD
5/ TN ratio is greater than 5.0), carbon source is when sufficient, if TN is high, can strengthen r, such as adopting 100～200%, strengthens nitratedly, makes full use of carbon source and carries out denitrification denitrogenation, improves nitric efficiency; If TN is low,, to reach the maximum denitrification dephosphorization efficiency of system as target, reduce r as far as possible, reduce backflow energy consumption.
2, C/N than medium (as TN clearance 70% require under BOD
5/ TN ratio is between 3.5～5.0), carbon source is not when very sufficient, taking denitrification dephosphorization as main, regulates r to appropriate value (as from 0～100%).
3, C/N than low (as TN clearance 70% require under BOD
5/ TN ratio is less than 3.5), when carbon source is not enough, taking denitrification dephosphorization as main.Though if carbon source can meet and release the requirement of phosphorus but TN is higher, adjustable r is to appropriate value (as from 0～200%), to compare increasing anoxic pond volume and add between external carbon source simultaneously, select less expensive person; If carbon source wretched insufficiency, still can not meet the requirement of releasing phosphorus, need to add external carbon source.
As shown in Figure 2: this technical process biological reaction tank used adopts the circular groove type structure of nested type, and outer fissure is cycling stream hypoxemia reaction tank 1, and middle ditch is pulling flow type hypoxia response pond 2, and septal fossula is cycling stream or complete hybrid aerobic reaction pond 3.Outer fissure is provided with filler, and middle ditch is provided with partition wall 4, and septal fossula is provided with the mixed-liquor return passage 5 to outer fissure.First sewage after pretreatment enter anaerobic pond, carry out mud-water separation in settling tank one after, supernatant liquor 6 enters hypoxemia reaction tank, the mud being settled out in settling tank one directly enters anoxic pond, mix with the flow liquid that goes out of hypoxemia reaction tank, then enter Aerobic Pond in short-term, the most laggard settling tank two, supernatant liquor is discharged, the part mud 7 being settled out is back to anaerobic pond, and part is discharged with excess sludge; Be provided with mixed-liquor return from Aerobic Pond in short-term to hypoxemia pond, reflux ratio is determined according to need.
The principal feature of this technical process is:
1. before anoxic pond, arrange and put Packed hypoxemia pond, its effect: the one, remove part nitrogen by Simultaneous Nitrification denitrification (SND), reduce nitrification liquid backflow energy consumption.The efficiency of denitrogenating of supposing SND is 30%, and nitrification liquid reflux ratio roughly can reduce half; The 2nd, the dissolved oxygen and the organism that make to enter anoxic pond are all lower, are conducive to the generation of denitrification dephosphorization effect; The 3rd, because organism is completely removed substantially, be conducive to the nitration reaction of Aerobic Pond;
2. short-time aeration pond is set after anoxic pond, as supplement (by regulating the large I of r to strengthen or weaken nitrification) nitrated and that inhale phosphorus, the further absorption of the nitrated and phosphorus of ammonia nitrogen be can promote, denitrogenation dephosphorizing efficiency and effluent quality fraction up to standard improved;
3. be arranged to two sludge systems, nitrifier mainly, with the form growth of attaching biological film, can not be subject to the impact of excess sludge discharge, therefore system can be taked the design in age of shorter mud, is conducive to the contradiction of balance denitrogenation and dephosphorization;
4. anaerobic pond adopts push flowing, is removed rapidly at front end with the aerobic sludge a small amount of nitrate brought into that refluxes, can eliminate the impact that it reacts follow-up anaerobic phosphorus release;
5. anoxic pond adopts push flowing, the NO that front end is higher
3 -concentration is conducive to improve the efficiency of denitrification dephosphorization, can remove more nitric nitrogen, absorbs more phosphorus under equal hydraulic detention time.
Claims (6)
1. the two mud circulation synchronous denitrification dephosphorization techniques of ALOAO, it is characterized in that: first sewage after pretreatment enter anaerobic pond, carry out mud-water separation in settling tank one after, supernatant liquor enters hypoxemia reaction tank, the mud being settled out in settling tank one directly enters anoxic pond, mixes with the flow liquid that goes out of hypoxemia reaction tank, then enters Aerobic Pond in short-term, the most laggard settling tank two, supernatant liquor is discharged, and the mud partial reflux being settled out is to anaerobic pond, and part is discharged with excess sludge; Be provided with mixed-liquor return from Aerobic Pond in short-term to hypoxemia pond, reflux ratio r is 0～200%;
The operation method of the described two mud circulation synchronous denitrification dephosphorization techniques of ALOAO is: when C/N is greater than 5.0 than high, BOD5/TN ratio, if TN is high, from 100%～200% increasing r, if TN is low,, to reach the maximum denitrification dephosphorization efficiency of system as target, reduce r; When C/N is when medium, BOD5/TN ratio is between 3.5～5.0, taking denitrification dephosphorization as main, regulate r from 0～100%; In the time that C/N is less than 3.5 than low, BOD5/TN ratio, taking denitrification dephosphorization as main, if to release the requirement TN of phosphorus higher though carbon source can meet, can regulate r from 0～200%.
2. the two mud circulation synchronous denitrification dephosphorization technique biological reaction tanks used of ALOAO according to claim 1, it is characterized in that: the circular groove type reaction tank structure that adopts nested type, outer fissure is hypoxemia reaction tank, and middle ditch is hypoxia response pond, and septal fossula is aerobic reaction pond; Outer fissure is provided with filler, and middle ditch is provided with partition wall, and septal fossula is provided with the mixed-liquor return passage to outer fissure.
3. the two mud circulation synchronous denitrification dephosphorization techniques of ALOAO according to claim 1, is characterized in that: above-mentioned anaerobic pond adopts push flowing, hydraulic detention time HRT0.7～1h.
4. the two mud circulation synchronous denitrification dephosphorization techniques of ALOAO according to claim 1, it is characterized in that: above-mentioned hypoxemia pond adopts adhere to/suspension type activated sludge reaction pond, filler is set in reaction tank, it can be suspension type filler, also can be suspension type flexibility or elastic filler, HRT4～5h.
5. the two mud circulation synchronous denitrification dephosphorization techniques of ALOAO according to claim 1, is characterized in that: above-mentioned anoxic pond adopts push flowing, HRT2～3h.
6. the two mud circulation synchronous denitrification dephosphorization techniques of ALOAO according to claim 1, is characterized in that: the HRT1～2h of above-mentioned Aerobic Pond, DO is controlled at 2mg/L.
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| WO2015189482A3 (en) * | 2014-09-30 | 2016-03-03 | Winflow Water Oy | Bioreactor for treating water fluid(s) |
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| CN108689491B (en) * | 2018-06-01 | 2021-07-16 | 青岛锦龙弘业环保有限公司 | Sewage treatment method capable of adjusting nitrogen and phosphorus removal capacity |
| CN109534611A (en) * | 2018-12-21 | 2019-03-29 | 广东尚骏科技有限公司 | Integrated sewage disposal equipment for reclaiming with pretreatment pool |
| CN111039406A (en) * | 2019-12-30 | 2020-04-21 | 江苏汇合环保科技有限公司 | Domestic sewage treatment system with biological rotating disc integrated with denitrification and dephosphorization and treatment process thereof |
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Effective date of registration: 20170623 Address after: 300074 Hexi District Meteorological Observatory Road, Tianjin, No. 99 Patentee after: China public works North China design studies Zong Yuan company limited Address before: 300074 Hexi District Meteorological Observatory Road, Tianjin, No. 99 Co-patentee before: North China Municipal Engineering Design & Research Institute Patentee before: National City Water Supply and Drainage Engineering Technology Research Center |