CN101423294A - Simultaneous nitrogen and phosphorus removal (AO)2SBR sewage treatment process - Google Patents
Simultaneous nitrogen and phosphorus removal (AO)2SBR sewage treatment process Download PDFInfo
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Abstract
The invention relates to a sewage treatment process for removing the nitrogen and phosphorus simultaneously; the whole process reaction is carried out in a sequence batch type bioreactor, respectively undergoes six stages of an anaerobic period, an aerobic period, a hypoxia period, an aerobic period, static precipitation, and a water drainage idle period, namely an anaerobic section and an aerobic section are reduced on the basis of a (AO)3SBR process, so denitrifying phosphorus accumulating bacteria can be cultivated easily and become a advantageous bacteria type of the phosphorus accumulating bacteria; moreover, denitrifying phosphorus absorption is carried out on the denitrifying phosphorus accumulating bacteria in a 'one-carbon dual-use' of the reaction and no carbon source is needed to be added additionally, so the aim of carbon source conservation is achieved, one aerobic section is reduced, the aerobic time is decreased to 90min from 130min, and the energy consumption is reduced by about 31 percent; in addition, as (AO)2SBR process lacks an (A/O) alternate operation compared with the(AO)3SBR process, the service life of instrument is prolonged; the removal effect for TN, TP, COD, and TOC of the sewage is respectively 78.47 percent, 99.5 percent, 86 percent, and 79.3 percent; when part of sodium acetate is added to the sewage, the removal effects of the nitrogen and the phosphorus are both increased to a certain extent.
Description
Technical field
The present invention relates to the domestic sewage treatment process of synchronous denitrification dephosphorizing.
Background technology
In sewage treatment process, under the anaerobic/anoxic alternate run condition, easily enrichment one class has the DPAOs (denitrification phosphorus-collecting bacterium) of denitrification and dephosphorization function concurrently, DPAOs can utilize oxygen, nitrate, nitrite as electron acceptor(EA), and its biological metabolism effect based on intracellular PHA s and glycogen is similar to traditional PAOs (polyP bacteria).During anaerobism, DPAOs absorbs voltaile fatty acid and is stored as intracellular PHA s (poly (hydroxyalkanoate)), and phosphorus and glycogen are released in poly-phosphorus hydrolysis in the born of the same parents simultaneously; Mass consumption intracellular PHA s inhales phosphorus and glycogen biosynthesis fast when aerobic; It then is to be electron acceptor(EA) with nitrate that phosphorus is inhaled in the anoxic denitrogenation, absorbs the outer positive phosphorus of born of the same parents and carries out denitrification denitrogenation, i.e. synchronous denitrification dephosphorizing by degraded intracellular PHA s.DPAOs need not additional carbon when being the electron acceptor(EA) denitrification nitrogen and phosphorus removal with nitrate, can realize " carbon is dual-purpose ", has advantages such as processing costs is low, energy expenditure is little, and sludge yield is few.
Sequencing batch active sludge (SBR) has the sewage treatment capacity of stability and high efficiency, in recent years, has occurred SBR novel process and modification technology thereof again, as (AO)
3SBR technology, (A
2/ O+A/O) technology, (A/O/A) SBR technology and (A/O) SBR technology etc.
(A/O/A) SBR technology needs additional carbon could increase the effect of denitrogenation dephosphorizing with (A/O) SBR technology is lower to the removal effect of the TN in the life water, TP, has not only wasted the energy but also wasted carbon source.
(AO)
3SBR technology is ripe relatively, good denitrification dephosphorization effect, its operation scheme is aerobic/anaerobic/anoxic/aerobic/anoxic/aerobic (A/O/A/O/AO), and the removal effect of the total nitrogen in the sanitary sewage (TN), total phosphorus (TP), chemical oxygen demand (COD) is respectively 75%, 99.5%, 85%.Yet (AO)
3SBR technology has consumed the more energy owing to the often aerobic and aerobic time is relatively long, and how the anaerobic and aerobic alternate frequency makes shorten dramatically the work-ing life of instrument again.
(A
2/ O+A/O) technology is with respect to (AO)
3SBR technology, two long aerobic sections are arranged and need additional carbon not only to waste the energy but also wasted carbon source, increased cost of sewage disposal, though improved the ratio of denitrification dephosphorization in addition because reaction does not thoroughly cause whole denitrogenation dephosphorizing effect lower.
Since nineteen ninety-nine, China's sanitary sewage quantity discharged has surpassed discharged volume of industrial waste water, and treatment rate of domestic sewage is still very low.Therefore, along with environmental requirement is more and more higher, process for removing nitrogen and phosphor from sewage becomes the focus in the water pollution control, develops the novel process that energy consumption is few, processing costs is low, nitrogen phosphorus removal effect is good and just seems particularly important and urgent.
Summary of the invention
The present invention is in order to solve (AO)
3Consumed the more energy owing to the often aerobic and aerobic time is relative than length in the SBR technology, how the anaerobic and aerobic alternate frequency makes the shortcoming problem that shorten dramatically the work-ing life of instrument again, developed that less energy consumption, processing costs reduce greatly and denitrogenation dephosphorizing effect stability novel process, i.e. (AO) efficiently
2SBR technology.
Technical scheme of the present invention
A kind of (AO) of synchronous denitrification dephosphorizing
2SBR sanitary sewage technology comprises the steps:
(1) denitrification phosphorus-collecting bacterium strain domestication
Seed sludge is taken from Shanghai mayor's bridge purification of water quality factory, is the step that the seed sludge of fetching is tamed in water inlet with artificial distribution:
1. tame seed sludge with the artificial distribution in sequence bioreactor, the seed sludge amount is 33% of a sequence bioreactor vessel volume, and used artificial distribution's water-quality guideline is: COD300mg/L, NH
4 +-N30mg/L, TP 8.0mg/L;
2. cultivate two months with enrichment polyP bacteria (PAOs) with the operation scheme of anaerobism 2h, aerobic 4h;
3. then at anaerobic phase, time of inserting one section anaerobic phase during aerobic and prolonging anaerobic phase gradually promotes the growth of denitrification phosphorus-collecting bacterium, empirical tests: the denitrification phosphorus-collecting bacteria growing is best under the operation scheme of the aerobic 0.5h of anaerobism 1.5h/ aerobic 1.0h/ anoxic 3.0h/; Cultivated two months in this domestication mode, cultivate denitrification phosphorus-collecting bacterium (DPAOs) and make DPAOs become superiority bacteria spp among the PAOs (polyP bacteria).
(2) pre-treatment of sanitary sewage
Pre-treatment step is: the sanitary sewage that pumps into is removed floating matter through coarse rack, fine fack respectively, passes through preliminary sedimentation tank sedimentation silt again.
(3) domestic sewage denitrifying-dephosphorizing is handled
In sequencing batch reactor, with pretreated sanitary sewage was with 1: 2 volume ratio dilution in the bacterial classification through taming and the step (2) in advance in the step (1), influent quality index average is COD 248.7mg/L, NH
4 +-N32mg/L, TN39.2mg/L, TP3.8mg/L, and in the adjustment reactor sanitary sewage at DO=2.0～3.0mg/L (aerobic phase), HRT is about 7h, under the condition of SRT=12～15d, experiences anaerobic phase, aerobic phase, anaerobic phase, aerobic phase, sedimentation and drawing, six stages of lay-up period respectively:
1. at anaerobic phase: control cycle is at 1.5h, and stirring velocity is 100r/m, and system DO is at≤0.2mg/L, utilizes the synthetic internal carbon source of organism in the water and the intravital poly-phosphorus of hydrolysis and Xiang Shuizhong discharges a large amount of phosphorus through acclimated microorganism in the mud;
2. the aerobic phase: control cycle is at 1.0h, while stir aeration with the speed of 100r/m, control DO is 2.0～3.0mg/L, at aerobic section polyP bacteria mass consumption internal carbon source and with O
2For electron acceptor(EA) carries out aerobic suction phosphorus, simultaneously ammonia nitrogen is carried out nitratedly, make it to be converted into nitric nitrogen and nitrite nitrogen;
3. anaerobic phase: control cycle is at 3.0h, and DO is that electron acceptor(EA) continues to utilize internal carbon source to carry out denitrifying phosphorus uptake at≤0.2mg/L with nitric nitrogen and nitrite nitrogen;
4. the aerobic phase: control cycle is at 0.5h, and DO is oxidized to nitric nitrogen to nitrite nitrogen at 2.0mg/L～3.0mg/L, prevent that nitrite nitrogen from producing pollution to water body, aerobic last spoil disposal, control mud age (SRT) is at 12～15d, and sludge concentration (MLSS) is at 3000～4000mg/L;
5. sedimentation and drawing: the mud mixture after aerobic staticly settles, and control cycle is at 1h;
6. lay-up period: enter lay-up period after discharging supernatant liquor, control cycle is at 1h, and residual mud and water are retained in the next cycle that enters in the sequence bioreactor.
Because sanitary sewage complicated component, few and the difficult degradation of organic content, thereby the COD utilization ratio reduces and to cause anaerobic stages to release the phosphorus amount significantly reducing, though nitrification effect is relatively good, but because the synthetic internal carbon source is less, nitrated nitric nitrogen that obtains and nitrite nitrogen can't be removed fully, thereby the effect of denitrogenating is lower slightly, if in sanitary sewage, add the part sodium acetate then the removal effect of nitrogen phosphorus raise many.
Technique effect of the present invention
Find by process results of the present invention, aerobic/anaerobic/anoxic/aerobic operation scheme more helps cultivating the denitrification phosphorus-collecting bacterium, make it become superiority bacteria spp (77.3%) in the polyP bacteria, and " carbon dual-purpose " of denitrification phosphorus-collecting bacterium in reaction carried out denitrifying phosphorus uptake and need not the mechanism of additional carbon, reached saving carbon source purpose; Reduced by an aerobic operation, made the aerobic time reduce to 90min, cut down the consumption of energy about 31% by original 130min; (AO)
2SBR technology is with respect to (AO)
3SBR technology has reduced by (A/O) alternate operation, thereby has prolonged the work-ing life of instrument.
(AO) of the present invention
2The technology of SBR synchronous denitrification dephosphorizing, one day three cycle of operation of this technology, phase 8h weekly, final operation scheme is that aerobic/anaerobic/anoxic/aerobic/quiescent setting/draining is idle, at DO=2.0～3.0mg/L (aerobic phase), HRT=20h, under the condition of SRT=12～15d to nitrogen, phosphorus treatment effect the best.Use this technology to need not that TN, TP, COD, the TOC removal effect to sanitary sewage is respectively 78.47%, 99.5%, 86%, 79.3% under the situation of additional carbon.The removal effect of nitrogen phosphorus all increases if add behind the part sodium acetate (COD=350mg/L) then in sanitary sewage, and wherein the clearance of nitrogen has improved 20.23%, and the clearance of phosphorus has improved 0.47%.
Description of drawings
Fig. 1, (AO)
2The SBR process flow diagram
NH in Fig. 2, sanitary wastewater one-period
4 +-N, NO
2 --N, NO
3 --N, TP concentration curve
TC, TOC, TIC, COD concentration curve in Fig. 3, sanitary wastewater one-period
Embodiment
Below in conjunction with embodiment the present invention is further set forth.
Embodiment
One, experiment water quality
Sequencing batch reactor adopts sanitary sewage as water inlet, and influent quality index average is as follows: COD248.7mg/L, NH
4 +-N32mg/L, TN39.2mg/L, TP3.8mg/L.
Two, experiment test
The conventional index of testing in the test has: TOC, COD, phosphorus, ammonia nitrogen, nitric nitrogen, nitrite nitrogen, MLSS etc., concrete measuring method is seen National Standard Method.
Three, a kind of (AO) of synchronous denitrification dephosphorizing
2SBR technology comprises the steps:
(1) denitrification phosphorus-collecting bacterium strain domestication
Seed sludge is taken from Shanghai mayor's bridge purification of water quality factory, is the step that the seed sludge of fetching is tamed in water inlet with artificial distribution:
1. tame seed sludge with the artificial distribution in sequence bioreactor, the seed sludge amount is 33% of a sequence bioreactor vessel volume, and used artificial distribution's water-quality guideline is: COD300mg/L, NH
4 +-N30mg/L, TP8.0mg/L;
2. cultivate two months with enrichment polyP bacteria (PAOs) with the operation scheme of anaerobism 2h, aerobic 4h;
3. then at anaerobic phase, time of inserting one section anaerobic phase during aerobic and prolonging anaerobic phase gradually promotes the growth of denitrification phosphorus-collecting bacterium, empirical tests: the denitrification phosphorus-collecting bacteria growing is best under the operation scheme of the aerobic 0.5h of anaerobism 1.5h/ aerobic 1.0h/ anoxic 3.0h/; Cultivated two months in this domestication mode, cultivate denitrification phosphorus-collecting bacterium (DPAOs) and make DPAOs become superiority bacteria spp among the PAOs (polyP bacteria).
(2) pre-treatment of sanitary sewage.
Pre-treatment step is: remove the floating matter in the sewage through coarse rack, fine fack respectively through the sanitary sewage that main pump pumps into, remove part silt through preliminary sedimentation tank again.
(3) domestic sewage denitrifying-dephosphorizing is handled
In the sequencing batch reactor of 3.5L, with in the step (1) in advance in the bacterial classification through taming and the step (2) pretreated sanitary sewage with 1: 2 volume ratio dilution.The water-quality guideline average of sanitary sewage is COD248.7mg/L, NH
4 +-N32mg/L, TN39.2mg/L, TP3.8mg/L, and in the adjustment reactor sanitary sewage at DO=2.0～3.0mg/L (aerobic phase), HRT=20h under the condition of SRT=12～15d, experiences anaerobic phase, aerobic phase, anaerobic phase, aerobic phase, sedimentation and drawing, six stages of lay-up period respectively.
1. at anaerobic phase
Control cycle is at 1.5h, and stirring velocity is 100r/m, and DO is at≤0.2mg/L, utilizes the synthetic internal carbon source of organism in the water and the intravital poly-phosphorus of hydrolysis and Xiang Shuizhong discharges a large amount of phosphorus through acclimated microorganism in the mud;
2. the aerobic phase
Control cycle is at 1.0h, while stir aeration with the speed of 100r/m, control DO is 2.0～3.0mg/L, at aerobic section polyP bacteria mass consumption internal carbon source and with O
2For electron acceptor(EA) carries out aerobic suction phosphorus, simultaneously ammonia nitrogen is carried out nitratedly, make it to be converted into nitric nitrogen and nitrite nitrogen;
3. anaerobic phase
Control cycle is at 3.0h, and DO is that electron acceptor(EA) continues to utilize internal carbon source to carry out denitrifying phosphorus uptake at≤0.2mg/L with nitric nitrogen and nitrite nitrogen;
4. the aerobic phase
Control cycle is at 0.5h, and DO is oxidized to nitric nitrogen to nitrite nitrogen at 2.0mg/L～3.0mg/L, prevents that nitrite nitrogen from producing pollution to water body, aerobic last spoil disposal, and control mud age (SRT) is at 12～15d, and sludge concentration (MLSS) is at 3000～4000mg/L;
5. quiescent setting
Mud mixture after aerobic staticly settles, and sedimentation time is 1.0h;
6. draining is idle
Enter lay-up period after discharging supernatant liquor, be 1.0h idle mixing time, and residual mud and water are retained in the next cycle that enters in the sequence bioreactor.
Because sanitary sewage complicated component, few and the difficult degradation of organic content, thereby the COD utilization ratio reduces and to cause anaerobic stages to release the phosphorus amount significantly reducing, nitrification effect is relatively good, but because the synthetic internal carbon source is less, nitrated nitric nitrogen that obtains and nitrite nitrogen can't be removed fully, thereby the effect of denitrogenating is lower, are 78.47%; The removal effect of nitrogen phosphorus all increases if add behind the part sodium acetate (COD=350mg/L) then in sanitary sewage, and wherein the clearance of nitrogen has improved 20.23%, and the clearance of phosphorus has improved 0.47% (almost completely removing).
Fig. 1 is NH in the water-feeding SBR reactive system one-period with the sanitary sewage
4 +-N, NO
2 --N, NO
3 -The concentration curve of-N, TP:
1. anaerobism section, the carbon source in the PAOs consume water (COD) is synthesized intracellular PHA s, discharges a large amount of phosphorus simultaneously, and the concentration of phosphorus rises rapidly; Whole anaerobic process have minor N H
4 +-N the effect of assimilating is removed.
2. aerobic section, PAOs mass consumption internal carbon source PHAs and with O
2For electron acceptor(EA) is inhaled phosphorus fast, the concentration of ammonia nitrogen and total phosphorus then descends fast, and the concentration of nitrite nitrogen, nitric nitrogen then slowly rises; Not only there is assimilation in the minimizing explanation aerobic processes of total nitrogen, also has denitrification for Removing Nitrogen.
3. anoxic section, because the existence of remaining dissolved oxygen and microorganism self growth be to the demand of ammonia nitrogen, ammonia nitrogen concentration is further reduced to; DPAOs is an internal carbon source with PHAs then, utilizes nitric nitrogen, nitrite nitrogen to carry out denitrification nitrogen and phosphorus removal as electron acceptor(EA).
4. aerobic, be a spot of nitrite nitrogen complete oxidation nitric nitrogen, avoided of the pollution of water outlet nitrite nitrogen to water body; If still contain phosphorus in the water then can continue aerobic quick suction phosphorus.The removal of total phosphorus mainly is aerobic quick suction phosphorus, and the removal of total nitrogen is based on denitrification denitrogenation, and this system reaches 78.47%, 99.5% respectively to the clearance of TN, TP in this cycle.
Fig. 2 is the change curve that TC, TOC, TIC, COD in the one-period adopt in this system, COD in the anaerobism section life water and TOC are degraded fast and are synthesized internal carbon source PHAs and rapid the minimizing as seen from the figure, COD, TOC have reduced 85%, 79% respectively, and the utilization of carbon source effect is better; In addition, TOC and COD behind the anaerobic phase (almost no longer changing), TC and the variation tendency basically identical of TIC in reaction have illustrated that the carbon source of this post consumption is synthetic internal carbon source (PHAs), have illustrated that also internal carbon source is converted into inorganic carbon when being consumed simultaneously.Trial adds some sodium acetates (COD=350mg/L) to sanitary sewage, the effect of finding denitrogenation dephosphorizing improves a lot, the clearance of TN, TP, TOC, COD reaches 98.70%, 99.97%, 87.3% and 92% respectively, than having improved 20.23%, 0.47%, 8.00%, 6.00%, carbon source improves its treatment effect outside therefore can adding in the less sanitary sewage of carbon source content in actual sewage is handled respectively.
In sum, using this technology to need not additional carbon all has removal effect preferably to total phosphorus, total nitrogen, the COD of real life sewage, and the removal effect of nitrogen phosphorus all increases if add behind the part sodium acetate then in sanitary sewage.
Above said content only is the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (1)
1, a kind of (AO) of synchronous denitrification dephosphorizing
2SBR sanitary sewage technology is characterized in that comprising the steps:
(1) denitrification phosphorus-collecting bacterium strain domestication
1. tame seed sludge with the artificial distribution in sequence bioreactor, the seed sludge amount is 33% of a sequence bioreactor vessel volume, and used artificial distribution's water-quality guideline is: COD300mg/L, NH
4 +-N30mg/L, TP8.0mg/L;
2. cultivate two months with the enrichment polyP bacteria with the operation scheme of anaerobism 2h, aerobic 4h;
3. with operation under the aerobic 0.5h condition of the aerobic 1.0h/ anoxic of anaerobism 1.5h/ 3.0h/ two months, cultivate the denitrification phosphorus-collecting bacterium and make it become superiority bacteria spp in the polyP bacteria;
(2) pre-treatment of sanitary sewage
1. pending sanitary sewage is removed the floating matter in the sewage through coarse rack, fine fack respectively;
2. remove part silt through preliminary sedimentation tank;
(3) domestic sewage denitrifying-dephosphorizing is handled
In sequencing batch reactor, with in the step (1) in advance in the bacterial classification through taming and the step (2) pretreated sanitary sewage mix with 1: 2 volume ratio, influent quality index average is COD 248.7mg/L, NH
4 +-N32mg/L, TN39.2mg/L, TP3.8mg/L, experience respectively anaerobic phase, aerobic phase (DO=2.0～3.0mg/L), anaerobic phase, aerobic phase, sedimentation and drawing, six stages of lay-up period:
1. at anaerobic phase: control cycle is at 1.5h, and stirring velocity is 100r/m, and DO≤0.2mg/L utilizes the synthetic internal carbon source of organism in the water and the intravital poly-phosphorus of hydrolysis and Xiang Shuizhong discharges a large amount of phosphorus through acclimated microorganism in the mud;
2. the aerobic phase: control cycle is at 1.0h, while stir aeration with the speed of 100r/m, control DO is about 2.5mg/L, polyP bacteria mass consumption internal carbon source and with O
2For electron acceptor(EA) carries out aerobic suction phosphorus, simultaneously ammonia nitrogen is carried out nitratedly, make it to be converted into nitric nitrogen and nitrite nitrogen;
3. anaerobic phase: control cycle is at 3.0h, and stirring velocity is 100r/m, and control DO≤0.2mg/L is that electron acceptor(EA) continues to utilize internal carbon source to carry out denitrifying phosphorus uptake with nitric nitrogen and nitrite nitrogen;
4. the aerobic phase: control cycle is at 0.5h, stirring velocity is 100r/m, DO is at 2.0mg/L～3.0mg/L, nitrite nitrogen is oxidized to nitric nitrogen, prevent that nitrite nitrogen from producing pollution to water body, aerobic last spoil disposal, control mud age (SRT) is at 12～15d, and sludge concentration (MLSS) is at 3000～4000mg/L;
5. sedimentation and drawing: the mud mixture after aerobic staticly settles, and control cycle is at 1h;
6. lay-up period: enter lay-up period after discharging supernatant liquor, control cycle is at 1h, and residual mud and water are retained in the next cycle that enters in the sequence bioreactor.
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