CN100369836C - Synchronous denitrogen dephosphorus technology of city sewagte - Google Patents
Synchronous denitrogen dephosphorus technology of city sewagte Download PDFInfo
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- CN100369836C CN100369836C CNB2006100313853A CN200610031385A CN100369836C CN 100369836 C CN100369836 C CN 100369836C CN B2006100313853 A CNB2006100313853 A CN B2006100313853A CN 200610031385 A CN200610031385 A CN 200610031385A CN 100369836 C CN100369836 C CN 100369836C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention discloses a synchronous nitrogen and phosphorus removing technique of city sewage, which has the advantages of short reaction process, carbon source saving, no need of the back flow of sludge, low power consumption, small occupation of land, low equipment investment, strong shock load resistance, stable operation, good treatment effect; the construction investment of the present invention is approximately 50 as that of a traditional sewage treatment process, and the running cost of the present invention is approximately 30 percent as that of the traditional sewage treatment process; in addition, due to the adoption of program control, the present invention also has the advantages of few control points, simple control and convenient running management. In the present invention, a compounded and suspended biologic system of activated sludge and biological film are formed in a sequence batch type compounded bioreactor, the bioreactor runs in the procedures of an anaerobic procedure, an aerobic procedure and an anoxic procedure, and the nitrogen, the phosphorus and the organic matter in the sewage are removed synchronously.
Description
Technical field
The present invention relates to a kind of synchronous denitrogen dephosphorus technology of city sewagte.
Background technology
Concern more complicated in the sewage disposal between denitrogenation and the dephosphorization, it is generally acknowledged that there are very big-difference in nitrifier, denitrifying bacteria and dephosphorization bacterial to physiological characteristics such as the demand of oxygen and generation cycles, are difficult in the high efficiency synchronous that realizes nitrogen, phosphorus in the same reactor and remove.Up-to-date denitrification dephosphorization technique all is based on to be taken the photograph/puts phosphorus metabolism mechanism to biology and re-recognize " denitrification dephosphorization " new way of finding the back and develop.The denitrification phosphorus-collecting bacterium will inhale the combination of phosphorus and denitrification process, not only save the demand to carbon source, also can save the required energy of aeration, in addition, can reduce the output of excess sludge greatly, meet target of sustainable development.At present, synchronous denitrogen dephosphorus technology of city sewagte with denitrification dephosphorization feature mainly contains aerobic/anaerobic (A/O), anaerobic/anoxic/aerobic (A/A/O), and multistage sequencing batch active sludge (SBR) etc., its common trait is: a plurality of reactors in series, parallel connection, realize the enrichment of dominant bacteria in the different reactor under different steps, the different operating condition, realize removal different pollutents.But all there are deficiencies such as the synchronous clearance of long flow path, construction investment and working cost height, nitrogen and phosphorus is low, control complexity in above technology, and can't simply transform to satisfy more strict emission control standards to building engineering.
Summary of the invention
Technical problem to be solved by this invention be overcome that nitrogen in the existing urban sewage treatment process, tp removal rate are low, deficiencies such as long flow path, investment are big, management difficulty, a kind of municipal effluent high efficiency synchronous denitrogenation dephosphorizing novel process is provided, this technological reaction flow process is short, this technology can be saved carbon source, need not mud and reflux, power consumption is low, and takes up an area of province, facility investment is few, and initial cost and working cost are respectively about 50%, 30% of traditional waste water treatment process; And have that the anti impulsion load ability is strong, stable, high treating effect; This technology can also adopt time variable control, and the reference mark is few, and control is simple, operational management is convenient.And built on the basis of old technology by simple easily and transformed the efficient removal that realizes pollutent in sewage work.
The technical solution adopted for the present invention to solve the technical problems is:
Form active sludge and biomembranous composite suspension living things system in the sequence batch (composite bioreactor; Reactor reaches nitrogen in the sewage, phosphorus and organic synchronous removal by anaerobism, aerobic, anoxic operation operation.
Add active sludge and suspended biological membrane carrier in the reactor, after two-phase method is cultivated domestication, form active sludge and biomembranous composite suspension living things system, realize microorganism coexistence on multiple populations, multi-functional, fs is handled phosphorous municipal effluent under the aerobic/anaerobic condition, begun to take shape the microbial film of some amount.Subordinate phase is handled phosphorous municipal effluent under aerobic/anaerobic/anoxia condition, improve with the quantity of nitrate nitrogen as the denitrification phosphorus-collecting bacterium of electron acceptor(EA), and form the microbial film of even compact, reaches the effect of ideal denitrogenation dephosphorizing.After cultivating, taming, in reactor, form active sludge and biomembranous composite suspension microorganism system, realize microorganism coexistence on multiple populations, multi-functional, the different generations cycle.
Concrete processing step of the present invention is:
1, active sludge and biofilm carrier adds.In the sequence batch (composite bioreactor, add active sludge and as the plastics multiaspect hollow ball of biofilm carrier, wherein active sludge is taken from municipal sewage plant's second pond, concentration of activated sludge is 3000～5000mg/L, plastics multiaspect hollow ball carrier can be bought from market, the carrier principal character is: the carrier material is a polyvinyl chloride plastic, diameter is 20～100mm, can form suspended state after microbial film on the carrier is cultivated successfully in sewage.The stacking volume that adds carrier accounts for 25～40% of sequence batch (composite bioreactor useful volume.
2, active sludge and biomembranous cultivation and domestication.Active sludge was divided into for two stages with biomembranous cultivation and domestication: the fs, the sequence batch (composite bioreactor moves under the aerobic/anaerobic condition, Treating Municipal Sewage, and sewage quality is: chemical oxygen demand (COD) (COD), 150～600mg/L; Suspended solids (SS), 100～300mg/L; Total nitrogen (TN), 20～80mg/L; Ammonia nitrogen (NH
4 +-N), 20～50mg/L; Total phosphorus (TP), 4～15mg/L.The sequence batch (composite bioreactor cycle of operation is 8h, its time is assigned as: water inlet 30min, anaerobism stirs 150min, aerobic aeration also stirs 240min, precipitation 30min, draining, spoil disposal 15min, idle 15min, pH is 6.5～8.2, anaerobic stages dissolved oxygen (DO)≤0.2mg/L, the about 2.0mg/L of aerobic stage dissolved oxygen.The water-filling ratio of sequence batch (composite bioreactor is 4: 5, and promptly the supernatant liquor volume of the end of term in week discharge is 0.8 of a sequence batch (composite bioreactor useful volume.The agitator motor rotating speed is 60～100r/min.Need operation 30d altogether, 90 cycles.In each cycle in this stage, be 2200～3000mg/L by activated sludge concentration (MLSS) in the spoil disposal control sequence batch (composite bioreactor, the sludge retention time of active sludge (SRT) is 10d.(purpose of fs is to make the sequence batch (composite bioreactor have phosphorus removal property efficiently with this understanding, and polyP bacteria becomes dominant bacteria in the active sludge, has begun to take shape the microbial film of some amount.) subordinate phase, the sequence batch (composite bioreactor moves under aerobic/anaerobic/anoxia condition, handles phosphorous municipal effluent, the same fs of sewage quality.The sequence batch (composite bioreactor cycle of operation is 8h, its time is assigned as: water inlet 30min, and anaerobism stirs 90min, and aerobic aeration also stirs 210min, anoxia stirring 90min, precipitation 30min, draining, spoil disposal 15min, idle 15min, pH is 6.5～8.2, anaerobic stages dissolved oxygen≤0.2mg/L, the about 2.0mg/L of aerobic stage dissolved oxygen, anoxic stage dissolved oxygen≤0.5mg/L, the water-filling ratio of sequence batch (composite bioreactor is 4: 5, the agitator motor rotating speed is 60～100r/min.Need operation 30d altogether, 90 cycles.In each cycle in this stage, respectively account for 50% approximately by the biomass on activated sludge concentration and the microbial film in the spoil disposal control sequence batch (composite bioreactor, wherein activated sludge concentration is 2200～3000mg/L, the sludge retention time of active sludge is 10d.(purpose of subordinate phase is to improve in active sludge and the microbial film with the quantity of nitrate nitrogen as the denitrification phosphorus-collecting bacterium of electron acceptor(EA), and forms the microbial film of even compact on carrier, reaches the effect of ideal denitrogenation dephosphorizing.) through this law cultivate, domestication back formation active sludge and biomembranous composite suspension microorganism system in the sequence batch (composite bioreactor, realize microorganism coexistence on multiple populations, multi-functional, the different generations cycle, water outlet after the processing reaches or near " integrated wastewater discharge standard " primary standard (GB8978-1996), technology begins commencement of commercial operation.
3, the commencement of commercial operation of technology.The technical process of commencement of commercial operation is: at first sewage is held back suspended substance bigger in the sewage and particulate matter through grid and settling pit, and settling pit double as equalizing tank is regulated the water yield and the water quality of sewage simultaneously.Regulate back sewage and be promoted in the sequence batch (composite bioreactor by pump, reactor earlier after anaerobism stirs, aerobic (aeration also stirs), anoxia stirring, leave standstill, draining spoil disposal, stage such as idle.The cycle of operation of sequence batch (composite bioreactor is 8h, and its time is assigned as: water inlet 30min, anaerobism stirs 90min, aerobic 210min, anoxia stirring 90min, precipitation 30min, draining, spoil disposal 15min, idle 15min.Anaerobism stirs section dissolved oxygen≤0.2mg/L, and this stage polyP bacteria is removed the organic phosphorus that discharges simultaneously in the sewage; Aerobic section starts Aeration fan, in reactor, charge into air by micro porous aeration head, by regulating aeration rate control dissolved oxygen is about 2.0mg/L, strengthen turbulent flow by stirring simultaneously, the absorption of realization part phosphorus, the complete nitrated and part total nitrogen of ammonia nitrogen are removed by synchronous nitration and anti-nitration reaction, and remaining hardly degraded organic substance in the further degradation of sewage; The anoxia stirring section is closed Aeration fan, dissolved oxygen≤0.5mg/L, and the denitrification phosphorus-collecting bacterium utilizes nitrate nitrogen to carry out denitrifying phosphorus uptake as electron acceptor(EA) under no carbon source condition, realizes the synchronous removal of nitrogen, phosphorus; Compound reactor is discharged supernatant liquor after leaving standstill 30min at last, and while spoil disposal, discharge active sludge unnecessary in the reactor and the microbial film that comes off, draining, spoil disposal time is 15min altogether, by activated sludge concentration in the spoil disposal controlling reactor is 2200～3000mg/L, and keeping the biomass in microbial film and the active sludge respectively is 50%; Draining and spoil disposal finish post-reactor and enter the idle stage, idle 15min altogether.Begin next reaction time behind idle the end.Handle the supernatant liquor of discharging the back through composite bioreactor and enter sterilization pool and sterilize, enter regional water body after up to standard; Rich phosphorated excess sludge does not reflux with the microbial film that comes off, and directly enters sludge treating system, and the sterilization of sewage and sludge treating system all adopt ordinary method.Technology is moved at normal temperatures, and the water-filling ratio of sequence batch (composite bioreactor is 4: 5, and the agitator motor rotating speed is 80r/min, and pH is 6.5～8.2.
This technology is suitable for the water quality of disposing of sewage: chemical oxygen demand (COD), 150～600mg/L; Suspended solids, 50～400mg/L; Total nitrogen, 20～80mg/L; Ammonia nitrogen, 20～60mg/L; Total phosphorus, 3～15mg/L.
The sequence batch (composite bioreactor possesses the growing environment of different strains such as aerobic polyP bacteria, denitrification phosphorus-collecting bacterium, nitrifier and denitrifying bacteria simultaneously, form active sludge and biomembranous composite suspension microorganism system, realize microorganism coexistence on multiple populations, multi-functional, the different generations cycle, the biophase population has diversified feature, formed microbial ecosystem is more stable, and anti-external interference and recovery regulating power are strong.Because biomembranous laminate structure, the microbial film top layer is an aerobic layer in the reaction process, the middle level is a layer of oxygen deficient, internal layer is an anaerobic layer, even so at aerobic stage, the environment that suitable anaerobism and anoxic microorganism growth are also arranged in the reactor, strengthened anaerobic-aerobic-anoxic in the cycle of operation reactor to the synchronous removal effect of nitrogen, phosphorus.In same reactor, can realize nitrogen, phosphorus removal effect efficiently, total nitrogen, total phosphorus and organic average removal rate are higher than 95%, 95% and 92% respectively.
It is inseparable with its fluidised form that is had and efficient mass transfer characteristic that higher organism, nitrogen and the phosphorus of the performance of this technology are removed efficient.Because this process using plastics multiaspect hollow ball is as biofilm carrier, the mixed system of microbial film and active sludge forms the complicated fluidised form that one-piece auger rises, the part is turbulent when stirring, the flow shear that produces can reduce the thickness of liquid film, reduce the size and the biomembranous thickness of active sludge flco, form fine and close microbial film, quicken biomembranous renewal, thereby reduce resistance to mass transfer.Simultaneously, because the centrifugal inertia of current, can make active sludge and carrier and organic particle do radial motion, the movement rate difference that particle diameter and mass discrepancy form, quickened of the migration of active sludge flco with respect to organic substrates, increased the inside and outside concentration difference of liquid film, helping spatially being formed with the organic pollutants concentration gradient distributes, show the mass transfer characteristic of electron acceptor(EA)s such as good oxygen and nitrate nitrogen and organic substrates, thereby improved the additional speed of organic substrates in the liquid film.In addition, because plastics multiaspect hollow ball has porous structure, biofilm surface is long-pending big, in the aerobic aeration stage, can adsorb certain bubble on carrier, thereby improve the utilization ratio of oxygen.For reaching same dissolved oxygen concentration, the aeration rate of this technology only is about 40% of a conventional activated sludge process.The transfer rate height of organism, nitrogen, phosphorus and organism in the reactor, thus the processing efficiency of system improved, and can reduce the volume of reactor.
Carry out active sludge and biomembranous cultivation and domestication by method provided by the invention, in the sequence batch (composite bioreactor, form the compound bio system of active sludge and suspended biological film, in same reactor, realize compound aspect microbial population, quantity and the growth conditions, move by sequence batch (anaerobic-aerobic-anoxic mode, realize the same denitrogenation dephosphorizing function of a plurality of reactor series and parallels of other technology, the anti impulsion load ability is strong, stable, and has strengthened removal effect.Inhale phosphorus, denitrification dephosphorization and synchronous nitration and denitrification effect by microorganism aerobic, realize the synchronous denitrification dephosphorizing effect, can efficiently remove organism, ammonia nitrogen, phosphorus, suspended solids in the municipal effluent, the every index of its effluent quality all is lower than " integrated wastewater discharge standard " primary standard (GB8978-1996).Oxygen utilization rate height in the reactor, its aeration rate only are 40% of conventional activated sludge process; Especially utilization of carbon source rate height when handling low carbon source high concentration N, phosphorus sewage, need not add carbon source, and technology surplus sludge volume in service is few and need not the mud backflow, can reduce running cost greatly, and working cost only is 40% of a traditional cities sewage treatment process.The sequence batch (composite bioreactor adopts the periodic mode operation simultaneously, can adopt time variable control, and the reference mark is few, and operational management is simple and convenient.This technology need not multiple combination of reactors operation in addition, takes up an area of province, less investment, and initial cost only is 60% of a traditional waste water treatment process.The sequencing batch activated sludge reactor of having built just becomes the sequence batch (composite bioreactor through simple transformation, need not increase any construction investment, but can significantly improve the efficient of denitrogenation dephosphorizing.
Description of drawings
Below in conjunction with drawings and Examples technical scheme of the present invention is further described.
Fig. 1 is a compound reactor synchronous denitrogen dephosphorus technology schema of the present invention.
Among the figure, 1. barrier, 2. equalizing tank, 3. sequence batch (composite bioreactor, 4. antisepsis contact tank, 5. aerating apparatus, 6. sterilization chemicals dosing plant, 7. programcontrol unit 8. sludge thickeners, 9. sludge dehydration device.
Embodiment
Embodiment 1
Please refer to Fig. 1, use this technology certain uptown sanitary sewage is handled, main units and equipment comprise barrier, equalizing tank, sequence batch (composite bioreactor, antisepsis contact tank, aerating apparatus, sterilization chemicals dosing plant, programcontrol unit, sludge thickener, sludge dehydration device and water pump, Aeration fan and auxiliary facilitys such as respective valves, pipeline.Sewage quality is: chemical oxygen demand (COD), 150～400mg/L, average out to 285mg/L; Suspended solids, 100～250mg/L, average out to 180mg/L; Total nitrogen, 26～50mg/L, average out to 40mg/L; Ammonia nitrogen, 20～38mg/L, average out to 29mg/L; Total phosphorus, 3～8mg/L, average out to 4.5mg/L.
Concrete enforcement comprises the steps:
1, active sludge and biofilm carrier adds.In the sequence batch (composite bioreactor, add active sludge and as the plastics multiaspect hollow ball of biofilm carrier, wherein active sludge is taken from municipal sewage plant's second pond, concentration of activated sludge is 4000mg/L, plastics multiaspect hollow ball carrier material is a polyvinyl chloride plastic, diameter is 80mm, and the stacking volume that adds carrier accounts for 30% of sequence batch (composite bioreactor useful volume.
2, active sludge and biomembranous cultivation and domestication.Active sludge was divided into for two stages with biomembranous cultivation and domestication: the fs, the sequence batch (composite bioreactor moves under the aerobic/anaerobic condition, handle this residential area sanitary sewage, the sequence batch (composite bioreactor cycle of operation is 8h, its time is assigned as: water inlet 30min, anaerobism stirs 150min, aerobic aeration also stirs 240min, precipitation 30min, draining, spoil disposal 15min, idle 15min, pH is 6.5～8.2, anaerobic stages dissolved oxygen≤0.2mg/L, the about 2.0mg/L of aerobic stage dissolved oxygen, the water-filling ratio of sequence batch (composite bioreactor is 4: 5, the agitator motor rotating speed is 80r/min.Move 30d altogether, 90 cycles.In each cycle in this stage, be 2400～2600mg/L by activated sludge concentration in the spoil disposal control sequence batch (composite bioreactor, the sludge retention time of active sludge is 10d.Subordinate phase, the sequence batch (composite bioreactor moves under aerobic/anaerobic/anoxia condition, handles this residential area sanitary sewage.The sequence batch (composite bioreactor cycle of operation is 8h, its time is assigned as: water inlet 30min, and anaerobism stirs 90min, and aerobic aeration also stirs 210min, anoxia stirring 90min, precipitation 30min, draining, spoil disposal 15min, idle 15min, pH is 6.5～8.2, anaerobic stages dissolved oxygen≤0.2mg/L, the about 2.0mg/L of aerobic stage dissolved oxygen, anoxic stage dissolved oxygen≤0.5mg/L, the water-filling ratio of sequence batch (composite bioreactor is 4: 5, the agitator motor rotating speed is 80r/min.Move 30d altogether, 90 cycles.In each cycle in this stage, respectively account for 50% approximately by the biomass on activated sludge concentration and the microbial film in the spoil disposal control sequence batch (composite bioreactor, wherein activated sludge concentration is 2400～2600mg/L, the sludge retention time of active sludge is 10d.Through this law cultivate, domestication back formation active sludge and biomembranous composite suspension microorganism system in the sequence batch (composite bioreactor, the water outlet of reactor reaches or near " integrated wastewater discharge standard " primary standard (GB8978-1996).
3, the commencement of commercial operation of technology.The technical process of commencement of commercial operation is: at first sewage is held back suspended substance bigger in the sewage and particulate matter through grid and settling pit, and settling pit double as equalizing tank is regulated the water yield and the water quality of sewage simultaneously; Regulate back sewage and be promoted in the sequence batch (composite bioreactor by pump, the cycle of operation of reactor is 8h.Flooding time is 30min; After water inlet finishes, stir by the agitating vane anaerobism, anaerobism stirs section dissolved oxygen≤0.2mg/L, and the reaction times is 90min; Opening Aeration fan then and continue and stir, fill air by the micro porous aeration head that is connected with aeration tube in reactor, is about 2.0mg/L by regulating Aeration fan aeration rate control dissolved oxygen, aerobic (aeration also stirs) 210min; , close Aeration fan, continue stir, be controlled at anoxia condition, anoxia stirring section dissolved oxygen≤0.5mg/L, reaction times 90min thereafter; Discharge supernatant liquor after leaving standstill 30min at last, and while spoil disposal, discharge active sludge unnecessary in the reactor and the microbial film that comes off, draining, spoil disposal time is 15min altogether, by activated sludge concentration in the spoil disposal controlling reactor is 2400～2600mg/L, and keeping the biomass in microbial film and the active sludge respectively is 50%; Draining and spoil disposal finish post-reactor and enter the idle stage, idle 15min altogether.Begin next reaction time behind idle the end.Handle the supernatant liquor of discharging the back through composite bioreactor and enter sterilization pool and sterilize, enter regional water body after up to standard; Rich phosphorated excess sludge does not reflux with the microbial film that comes off, and directly enters sludge treating system, and the sterilization of sewage and sludge treating system all adopt ordinary method.Technology is moved at normal temperatures, and the water-filling ratio of sequence batch (composite bioreactor is 4: 5, and the agitator motor rotating speed is 80r/min, and pH is 6.5～8.2.
Operation result shows: the every index of the effluent quality of this technology all is better than " integrated wastewater discharge standard " primary standard (GB8978-1996).Wherein, chemical oxygen demand (COD), 10～18mg/L, average out to 15mg/L, average removal rate are 94.7%; Suspended solids, 12～20mg/L, average out to 16mg/L, average removal rate are 91.2%; Total nitrogen, 1.5～2.3mg/L, average out to 1.85mg/L, average removal rate are 95.4%; Ammonia nitrogen, 0.05～0.10mg/L, average out to 0.07mg/L, clearance is greater than 99%; Total phosphorus, 0.15～0.30mg/L, average out to 0.21mg/L, average removal rate are 95.3%.
Please refer to Fig. 1, use this technology and carried out the laboratory pilot scale, handle low carbon source, high concentration N, phosphorus sewage, check this art breading to hang down the ability of carbon source, high concentration N, phosphorus sewage.The main units of test technology and equipment comprise barrier, equalizing tank, sequence batch (composite bioreactor, antisepsis contact tank, aerating apparatus, sterilization chemicals dosing plant, programcontrol unit, sludge thickener, sludge dehydration device and water pump, Aeration fan and auxiliary facilitys such as respective valves, pipeline.
Low carbon source, high concentration N, phosphorus sewage are to add corresponding medicament configuration to form in sanitary sewage, when the sanitary sewage of biotope after barrier is held back suspended substance and particulate matter bigger in the sewage, according to the water quality detection result, in equalizing tank, add crude dextrose, NH
4Cl, NaH
2PO
4And Na
2HPO
4, the concentration of regulating total nitrogen, ammonia nitrogen and total phosphorus in the sewage, the sewage after the adjusting is stored in equalizing tank.Adding medicament adjusting back sewage quality is: chemical oxygen demand (COD), 180～300mg/L, average out to 225mg/L; Suspended solids, 100～250mg/L, average out to 180mg/L; Total nitrogen, 66～85mg/L, average out to 74mg/L; Ammonia nitrogen, 55～65mg/L, average out to 61.5mg/L; Total phosphorus, 11～15mg/L, average out to 12.5mg/L.
Concrete enforcement comprises the steps:
1, active sludge and biofilm carrier adds.In the sequence batch (composite bioreactor, add active sludge and as the plastics multiaspect hollow ball of biofilm carrier, wherein active sludge is taken from municipal sewage plant's second pond, concentration of activated sludge is 3800mg/L, plastics multiaspect hollow ball carrier material is a polyvinyl chloride plastic, diameter is 50mm, and the stacking volume that adds carrier accounts for 30% of sequence batch (composite bioreactor useful volume.
2, active sludge and biomembranous cultivation and domestication.Active sludge was divided into for two stages with biomembranous cultivation and domestication: the fs, the sequence batch (composite bioreactor moves under the aerobic/anaerobic condition, handle the low carbon source of adding after medicament is regulated, high concentration N, phosphorus sewage, the sequence batch (composite bioreactor cycle of operation is 8h, its time is assigned as: water inlet 30min, anaerobism stirs 150min, aerobic aeration also stirs 240min, precipitation 30min, draining, spoil disposal 15min, idle 15min, pH is 6.5～8.2, anaerobic stages dissolved oxygen≤0.2mg/L, the about 2.0mg/L of aerobic stage dissolved oxygen, agitator motor rotating speed are 80r/min.Move 30d altogether, 90 cycles.In each cycle in this stage, be 2400～2600mg/L by activated sludge concentration in the spoil disposal control sequence batch (composite bioreactor, the water-filling ratio of sequence batch (composite bioreactor is 4: 5, the sludge retention time of active sludge is 10d.Subordinate phase, the sequence batch (composite bioreactor moves under aerobic/anaerobic/anoxia condition, handles the low carbon source, high concentration N, the phosphorus sewage that add after medicament is regulated.The sequence batch (composite bioreactor cycle of operation is 8h, its time is assigned as: water inlet 30min, anaerobism stirs 90min, and aerobic aeration also stirs 210min, anoxia stirring 90min, precipitation 30min, draining, spoil disposal 15min, idle 15min, pH is 6.5～8.2, anaerobic stages dissolved oxygen≤0.2mg/L, the about 2.0mg/L of aerobic stage dissolved oxygen, anoxic stage dissolved oxygen≤0.5mg/L, the agitator motor rotating speed is 80r/min.Move 30d altogether, 90 cycles.In each cycle in this stage, respectively account for 50% approximately by the biomass on activated sludge concentration and the microbial film in the spoil disposal control sequence batch (composite bioreactor, wherein activated sludge concentration is 2400～2600mg/L, the water-filling ratio of sequence batch (composite bioreactor is 4: 5, and the sludge retention time of active sludge is 10d.Through this law cultivate, domestication back formation active sludge and biomembranous composite suspension microorganism system in the sequence batch (composite bioreactor, the water outlet of reactor reaches or near " integrated wastewater discharge standard " primary standard (GB8978-1996).
3, the commencement of commercial operation of technology.The technical process of commencement of commercial operation is: at first sewage is held back suspended substance bigger in the sewage and particulate matter through grid and settling pit, while settling pit double as equalizing tank, the water yield and water quality to sewage are regulated, and simultaneously according to the water quality detection result, add glucose, NH in equalizing tank
4Cl, NaH
2PO
4And Na
2HPO
4, the concentration of regulating total nitrogen, ammonia nitrogen and total phosphorus in the sewage, the sewage after the adjusting is stored in equalizing tank; Regulate back sewage and be promoted in the sequence batch (composite bioreactor by pump, the cycle of operation of reactor is 8h.Flooding time is 30min; After water inlet finishes, stir by the agitating vane anaerobism, anaerobism stirs section dissolved oxygen≤0.2mg/L, and the reaction times is 90min; Opening Aeration fan then and continue and stir, fill air by the micro porous aeration head that is connected with aeration tube in reactor, is about 2.0mg/L by regulating Aeration fan aeration rate control dissolved oxygen, aerobic (aeration also stirs) 210min; , close Aeration fan, continue stir, be controlled at anoxia condition, anoxia stirring section dissolved oxygen≤0.5mg/L, reaction times 90min thereafter; Discharge supernatant liquor after leaving standstill 30min at last, and while spoil disposal, discharge active sludge unnecessary in the reactor and the microbial film that comes off, draining, spoil disposal time is 15min altogether, by activated sludge concentration in the spoil disposal controlling reactor is 2400～2600mg/L, and keeping the biomass in microbial film and the active sludge respectively is 50%; Draining and spoil disposal finish post-reactor and enter the idle stage, idle 15min altogether.Begin next reaction time behind idle the end.Handle the supernatant liquor of discharging the back through composite bioreactor and enter sterilization pool and sterilize, enter regional water body after up to standard; Rich phosphorated excess sludge does not reflux with the microbial film that comes off, and directly enters sludge treating system, and the sterilization of sewage and sludge treating system all adopt ordinary method.Technology is moved at normal temperatures, and the water-filling ratio of sequence batch (composite bioreactor is 4: 5, and the agitator motor rotating speed is 80r/min, and pH is 6.5～8.2.
Experimental result shows: the effluent quality of this technology and good to the removal effect of pollutent, and wherein, chemical oxygen demand (COD) concentration is 10～21mg/L, average out to 16.9mg/L, clearance are 90.7%～94.5%, average out to 92.5%; Suspended sediment concentration is 12～20mg/L, and average out to 15mg/L, clearance are 89.4%～93.8%, average out to 91.7%; Total nitrogen concentration is 2.1～4.6mg/L, and mean concns is 3.58mg/L, and clearance is 92.1%～97.5%, and average removal rate is 95.1%; Ammonia nitrogen concentration is, 0～0.10mg/L, and average out to 0.06mg/L, clearance is greater than 99%; Total phosphorus concentration is 0.35～0.49mg/L, and average out to 0.45mg/L, clearance are 92.74%～97.68%, average out to 96.4%.The every index of water outlet all is better than " integrated wastewater discharge standard " primary standard (GB8978-1996).
Claims (3)
1. synchronous denitrogen dephosphorus technology of city sewagte, it is to add active sludge and suspended biological membrane carrier in the sequence batch (composite bioreactor, after two-phase method is cultivated domestication, form active sludge and biomembranous composite suspension living things system, realize microorganism coexistence on multiple populations, multi-functional, fs is handled phosphorous municipal effluent under the aerobic/anaerobic condition, begun to take shape the microbial film of some amount; Subordinate phase is handled phosphorous municipal effluent under aerobic/anaerobic/anoxia condition, improve with the quantity of nitrate nitrogen as the denitrification phosphorus-collecting bacterium of electron acceptor(EA), and form the microbial film of even compact, reaches the effect of ideal denitrogenation dephosphorizing; After cultivating, taming, in reactor, form active sludge and biomembranous composite suspension microorganism system, realize microorganism coexistence on multiple populations, multi-functional, the different generations cycle, it is characterized in that concrete processing step is:
1.. adding of active sludge and biofilm carrier: in the sequence batch (composite bioreactor, add active sludge and as the plastics multiaspect hollow ball of biofilm carrier, wherein active sludge is taken from municipal sewage plant's second pond, concentration of activated sludge is 3000～5000mg/L, plastics multiaspect hollow ball carrier is bought from market, the carrier principal character is: the carrier material is a polyvinyl chloride plastic, diameter is 20～100mm, can form suspended state after microbial film on the carrier is cultivated successfully in sewage; The stacking volume that adds carrier accounts for 25～40% of sequence batch (composite bioreactor useful volume;
2.. active sludge and biomembranous cultivation and domestication: active sludge was divided into for two stages with biomembranous cultivation and domestication: the fs, the sequence batch (composite bioreactor moves under the aerobic/anaerobic condition, Treating Municipal Sewage, sewage quality is: chemical oxygen demand (COD), 150～600mg/L; Suspended solids, 100～300mg/L; Total nitrogen, 20～80mg/L; Ammonia nitrogen, 20～50mg/L; Total phosphorus, 4～15mg/L; The sequence batch (composite bioreactor cycle of operation is 8h, its time is assigned as: water inlet 30min, anaerobism stirs 150min, aerobic aeration also stirs 240min, precipitation 30min, draining, spoil disposal 15min, idle 15min, pH is 6.5～8.2, anaerobic stages dissolved oxygen≤0.2mg/L, the about 2.0mg/L of aerobic stage dissolved oxygen, the water-filling ratio of sequence batch (composite bioreactor is 4: 5, and promptly the supernatant liquor volume of the end of term in week discharge is 0.8 of a sequence batch (composite bioreactor useful volume, and the agitator motor rotating speed is 60～100r/min; Need operation 30d altogether, 90 cycles; In each cycle in this stage, be 2200～3000mg/L by activated sludge concentration in the spoil disposal control sequence batch (composite bioreactor, the sludge retention time of active sludge is 10d; Subordinate phase, the sequence batch (composite bioreactor moves under aerobic/anaerobic/anoxia condition, handle phosphorous municipal effluent, the same fs of sewage quality, the sequence batch (composite bioreactor cycle of operation is 8h, its time is assigned as: water inlet 30min, anaerobism stirs 90min, aerobic aeration also stirs 210min, anoxia stirring 90min, precipitation 30min, draining, spoil disposal 15min, idle 15min, pH is 6.5～8.2, anaerobic stages dissolved oxygen≤0.2mg/L, the about 2.0mg/L of aerobic stage dissolved oxygen, anoxic stage dissolved oxygen≤0.5mg/L, the water-filling ratio of sequence batch (composite bioreactor is 4: 5, the agitator motor rotating speed is 60～100r/min, need operation 30d altogether, 90 cycles, in each cycle in this stage, respectively account for 50% approximately by the biomass on activated sludge concentration and the microbial film in the spoil disposal control sequence batch (composite bioreactor, wherein activated sludge concentration is 2200～3000mg/L, the sludge retention time of active sludge is 10d, cultivate through this law, the domestication back forms active sludge and biomembranous composite suspension microorganism system in the sequence batch (composite bioreactor, realize on multiple populations, multi-functional, the coexistence of the microorganism in different generations cycle, the water outlet after the processing reach or near the primary standard of " integrated wastewater discharge standard " GB8978-1996, technology begins commencement of commercial operation;
3.. the commencement of commercial operation of technology: the technical process of commencement of commercial operation is: at first sewage is held back suspended substance bigger in the sewage and particulate matter through grid and settling pit, and settling pit double as equalizing tank is regulated the water yield and the water quality of sewage simultaneously; Regulating back sewage is promoted in the sequence batch (composite bioreactor by pump, reactor earlier after anaerobism stirring, aerobic aeration and stirring, anoxia stirring, leave standstill, draining spoil disposal, idle stage, the cycle of operation of sequence batch (composite bioreactor is 8h, its time is assigned as: water inlet 30min, anaerobism stirs 90min, aerobic 210min, anoxia stirring 90min, precipitation 30min, draining, spoil disposal 15min, idle 15min, anaerobism stirs section dissolved oxygen≤0.2mg/L, and this stage polyP bacteria is removed the organic phosphorus that discharges simultaneously in the sewage; Aerobic section starts Aeration fan, in reactor, charge into air by micro porous aeration head, by regulating aeration rate control dissolved oxygen is about 2.0mg/L, strengthen turbulent flow by stirring simultaneously, the absorption of realization part phosphorus, the complete nitrated and part total nitrogen of ammonia nitrogen are removed by synchronous nitration and anti-nitration reaction, and remaining hardly degraded organic substance in the further degradation of sewage; The anoxia stirring section is closed Aeration fan, dissolved oxygen≤0.5mg/L, and the denitrification phosphorus-collecting bacterium utilizes nitrate nitrogen to carry out denitrifying phosphorus uptake as electron acceptor(EA) under no carbon source condition, realizes the synchronous removal of nitrogen, phosphorus; Compound reactor is discharged supernatant liquor after leaving standstill 30min at last, and while spoil disposal, discharge active sludge unnecessary in the reactor and the microbial film that comes off, draining, spoil disposal time is 15min altogether, by activated sludge concentration in the spoil disposal controlling reactor is 2200～3000mg/L, and keeping the biomass in microbial film and the active sludge respectively is 50%; Draining and spoil disposal finish post-reactor and enter the idle stage, and idle 15min altogether begins next reaction time behind idle the end, handle the supernatant liquor of discharging the back through composite bioreactor and enter sterilization pool and sterilize, and enter regional water body after up to standard; Rich phosphorated excess sludge does not reflux with the microbial film that comes off, directly enter sludge treating system, the sterilization of sewage and sludge treating system all adopt ordinary method, technology is moved at normal temperatures, the water-filling ratio of sequence batch (composite bioreactor is 4: 5, the agitator motor rotating speed is 80r/min, and pH is 6.5～8.2; Described aeration adopts air compressor and aeration head associating aeration, or is other aeration mode, realizes anaerobic stages dissolved oxygen≤0.2mg/L, the about 2.0mg/L of aerobic stage dissolved oxygen, anoxic stage dissolved oxygen≤0.5mg/L.
2. synchronous denitrogen dephosphorus technology of city sewagte as claimed in claim 1, it is characterized in that: the density of biofilm carrier is close with the density of water, and after microbial film formed on the carrier, carrier was slightly heavier than water, sink when leaving standstill, just in time form suspended state when stirring or aeration; Solid support material is a polyvinyl chloride, is shaped as sphere, cylindrical or other shape, loose and porous structure, and surface-area is big.
3. synchronous denitrogen dephosphorus technology of city sewagte as claimed in claim 1 is characterized in that: time variable control or operation or be manual operation are automatically adopted in operation control.
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