不同污泥龄(SRT)对SNEDPR系统脱氮除磷影响
|
摘要
为了解不同污泥龄(SRT)对同步硝化内源反硝化除磷(SNEDPR)系统脱氮除磷性能的影响,采用4组延时厌氧(180min)/低氧(溶解氧0.5~1.0 mg·L~(-1))运行的SBR反应器,以实际城市污水为处理对象,考察不同的SRT(5、10、15、25 d)条件下系统的脱氮除磷性能及其污泥性状的变化情况.结果表明,当SRT≥10 d时,短SRT有利于提高PAOs的竞争优势;在SRT为15 d和10 d时,系统除磷性能均较高,尤其是当SRT=10 d时,PPAOs,An平均为68.4%,PRA和PUA分别高达31.9mg·L~(-1)和34.3 mg·L~(-1).在SRT为15 d和10 d时,系统的硝化性能不受SRT变化的影响,且在SRT=15 d时,系统具有最高的脱氮性能,TN去除率和SNED率分别平均为89.6%和71.8%.在SRT≥10 d时,系统的COD去除性能不受SRT的变化影响,去除率达78%以上;但SRT=5 d时,由于系统生物量的流失使得系统对C、N、P的去除性能均较差,SNED率和PO3-4-P去除率分别低至5.7%和0.5%.此外,在SRT=15 d时,系统污泥沉降性能最好,SV和SVI分别为20%和64 mL·g~(-1),且污泥浓度随着SRT的延长而升高;长SRT(25 d)下系统抗冲击负荷能力较强,但污泥的沉降性能变差.
This study focuses on the nitrogen(N) and phosphorus(P) removal characteristics in a simultaneous nitrification endogenous denitrification and phosphorus removal(SNEDPR) system operating at different sludge retention time(SRT).Four extended anaerobic/low aerobic(dissolved oxygen:0.5-1.0 mg·L~(-1))-operated sequencing batch reactors(SBRs) fed with municipal sewage were studied at different SRT of 5,10,15,and 25 d.The experimental results show that a shorter SRT at an SRT ≥10 d enhances the competitive advantage of PAOs in the system and an efficient phosphorus removal performance of the SNEDPR system was achieved at a SRT of 10 d and 15 d.Especially at an SRT of 10 d;the average PPAOs,Anwas 68.4%,the PRA and PUA reached 31.9 and 34.3 mg·L~(-1),respectively.The nitrification performance of the system was not affected by SRT changes.The most efficient nitrogen removal performance was achieved at a SRT of 15 d,with a high average TN removal and SNED efficiencies reaching 89.6%and 71.8%,respectively.At a SRT ≥10 d,the COD removal performance of the SNEDPR system was also not affected by SRT changes.The COD removal efficiencies were higher than 78%.However,when the SRT was shortened to 5 d,the C,N,and P performances of the system worsened due to the loss of biomass;the SNED and PO3-4-P removal efficiencies were as low as 5.7% and0.5%,respectively.In addition,at an SRT=15 d,the sludge-settling performance of the system was the best.The SV and SVI were20% and 64 mL·g~(-1),respectively,and the sludge concentration increased with the extension of the SRT.Under long SRT(25 d)operation,the system showed a good resistance to shock loads,but the sedimentation performance of the sludge deteriorated.
This study focuses on the nitrogen(N) and phosphorus(P) removal characteristics in a simultaneous nitrification endogenous denitrification and phosphorus removal(SNEDPR) system operating at different sludge retention time(SRT).Four extended anaerobic/low aerobic(dissolved oxygen:0.5-1.0 mg·L~(-1))-operated sequencing batch reactors(SBRs) fed with municipal sewage were studied at different SRT of 5,10,15,and 25 d.The experimental results show that a shorter SRT at an SRT ≥10 d enhances the competitive advantage of PAOs in the system and an efficient phosphorus removal performance of the SNEDPR system was achieved at a SRT of 10 d and 15 d.Especially at an SRT of 10 d;the average PPAOs,Anwas 68.4%,the PRA and PUA reached 31.9 and 34.3 mg·L~(-1),respectively.The nitrification performance of the system was not affected by SRT changes.The most efficient nitrogen removal performance was achieved at a SRT of 15 d,with a high average TN removal and SNED efficiencies reaching 89.6%and 71.8%,respectively.At a SRT ≥10 d,the COD removal performance of the SNEDPR system was also not affected by SRT changes.The COD removal efficiencies were higher than 78%.However,when the SRT was shortened to 5 d,the C,N,and P performances of the system worsened due to the loss of biomass;the SNED and PO3-4-P removal efficiencies were as low as 5.7% and0.5%,respectively.In addition,at an SRT=15 d,the sludge-settling performance of the system was the best.The SV and SVI were20% and 64 mL·g~(-1),respectively,and the sludge concentration increased with the extension of the SRT.Under long SRT(25 d)operation,the system showed a good resistance to shock loads,but the sedimentation performance of the sludge deteriorated.
引文
[1]Wang X X,Wang S Y,Xue T L,et al.Treating low carbon/nitrogen(C/N)wastewater in simultaneous nitrificationendogenous denitrification and phosphorous removal(SNDPR)systems by strengthening anaerobic intracellular carbon storage[J].Water Research,2015,77:191-200.
[2]Zeng R J,Lemaire R,Yuan Z G,et al.Simultaneous nitrification,denitrification,and phosphorus removal in a labscale sequencing batch reactor[J].Biotechnology and Bioengineering,2003,84(2):170-178.
[3]Yang Q,Shen N,Lee Z M P,et al.Simultaneous nitrification,denitrification and phosphorus removal(SNDPR)in a full-scale water reclamation plant located in warm climate[J].Water Science and Technology:A Journal of the International Association on Water Pollution Research,2016,74(2):448-456.
[4]冷璐,信欣,鲁航,等.同步硝化反硝化耦合除磷工艺的快速启动及其运行特征[J].环境科学,2015,36(11):4180-4188.Leng L,Xin X,Lu H,et al.Rapid start-up of simultaneous nitrification and denitrification coupled phosphorus removal process and its performing characteristics[J].Environmental Science,2015,36(11):4180-4188.
[5]张万友,张兰河,杨涛,等.不同有机碳源对SBR工艺同步硝化反硝化影响[J].化工进展,2010,29(12):2395-2399.Zhang W Y,Zhang L H,Yang T,et al.Effects of organic carbon on simultaneous nitrification and denitrification in sequencing batch reactor[J].Chemical Industry and Engineering Progress,2010,29(12):2395-2399.
[6]戴娴,王晓霞,彭永臻,等.进水C/N对富集聚磷菌的SNDPR系统脱氮除磷的影响[J].中国环境科学,2015,35(9):2636-2643.Dai X,Wang X X,Peng Y Z,et al.Effect of influent C/N ratio on simultaneous nitrification-denitrification and phosphorus removal(SNDPR)enriched with phosphorus accumulating organisms(PAOs)[J].China Environmental Science,2015,35(9):2636-2643.
[7]赵骥,王晓霞,李夕耀,等.DO浓度对EBPR耦合SND处理低C/N污水的影响[J].中国环境科学,2018,38(1):120-128.Zhao J,Wang X X,Li X Y,et al.Effect of DO concentration on the combination of EBPR and SND for low C/N sewage treatment[J].China Environmental Science,2018,38(1):120-128.
[8]邹联沛,张立秋,王宝贞,et al.MBR中DO对同步硝化反硝化的影响[J].中国给水排水,2001,17(6):10-14.Zou P L,Zhang L Q,Wang B Z,et al.Effect of DO on simultaneous nitrification and denitrification in MBR[J].China Water&Wastewater,2001,17(6):10-14.
[9]李绍峰,崔崇威,黄君礼,et al.DO和HRT对MBR同步硝化反硝化影响研究[J].哈尔滨工业大学学报,2007,39(6):887-890.Li S F,Cui C W,Huang J L,et al.Influence of DO and HRTon simultaneous nitrification and denitrification in MBR[J].Journal of Harbin Institute of Technology,2007,39(6):887-890.
[10]周海东,刘勤亚,张业健.泥龄应用中有关问题的探讨[J].污染防治技术,2003,16(2):13-16.Zhou H D,Liu Q Y,Zhang Y J.Discussion on problems of application of sludge age[J].Pollution Control Technology,2003,16(2):13-16.
[11]李亚静,陈修辉,孙力平,等.不同碳源和泥龄对反硝化聚磷的影响[J].环境工程学报,2010,4(3):513-516.Li Y J,Chen X H,Sun L P,et al.Effect of different carbon sources and SRT on denitrifying phosphorus removal[J].Chinese Journal of Environmental Engineering,2010,4(3):513-516.
[12]王春丽,马放,刘慧,等.泥龄对反硝化除磷效能的影响[J].东北农业大学学报,2007,38(5):637-640.Wang C L,Ma F,Liu H,et al.Effect of SRT on denitrifying dephosphatation[J].Journal of Northeast Agricultural University,2007,38(5):637-640.
[13]Chua A S M,Takabatake H,Satoh H,et al.Production of polyhydroxyalkanoates(PHA)by activated sludge treating municipal wastewater:effect of pH,sludge retention time(SRT),and acetate concentration in influent[J].Water Research,2003,37(15):3602-3611.
[14]韩玮,袁林江,柴璐.长泥龄污水生物除磷系统的除磷效果[J].安全与环境学报,2012,12(5):17-22.Han W,Yuan L J,Chai L.Effects of sludge retention timelength on the biological phosphorus removal[J].Journal of Safety and Environment,2012,12(5):17-22.
[15]左宁,吉芳英.污泥龄对HA-A/A-MCO工艺除磷和污泥特性的影响[J].中国给水排水,2012,28(9):30-34.Zuo N,Ji F Y.Effect of SRT on phosphorus removal and sludge characteristics in HA-A/A-MCO sludge reduction process[J].China Water&Wastewater,2012,28(9):30-34.
[16]国家环境保护局.水和废水监测分析方法[M].(第四版).北京:中国环境科学出版社,2002.
[17]Wang X X,Wang S Y,Zhao J,et al.Combining simultaneous nitrification-endogenous denitrification and phosphorus removal with post-denitrification for low carbon/nitrogen wastewater treatment[J].Bioresource Technology,2016,220:17-25.
[18]Wang X X,Wang S Y,Zhao J,et al.A novel stoichiometries methodology to quantify functional microorganisms in simultaneous(partial)nitrification-endogenous denitrification and phosphorus removal(SNEDPR)[J].Water Research,2016,95:319-329.
[19]廖艳,钟华文,林仲.SRT对短程反硝化除磷的影响研究[J].广州化工,2016,44(2):57-59.Liao Y,Zhong H W,Lin Z.Effect of SRT on short-cut denitrifying phosphorus removal[J].Guangzhou Chemical Industry,2016,44(2):57-59.
[20]Ng W J,Ong S L,Hu J Y.Denitrifying phosphorus removal by anaerobic/anoxic sequencing batch reactor[J].Water Science and Technology:A Journal of the International Association on Water Pollution Research,2001,43(3):139-146.
[21]吴光学,管运涛.SRT及碳源浓度对厌氧/好氧交替运行SBR工艺中PHB的影响[J].环境科学,2005,26(2):126-130.Wu G X,Guan Y T.Effects of SRT and carbon concentration on the PHB in the anaerobic/aerobic alternative operating SBRprocess[J].Environmental Science,2005,26(2):126-130.
[22]郑兴灿,李亚新.污水脱氮除磷技术[M].北京:中国建筑工业出版社,1998.
[23]王建龙,彭永臻,王淑莹.污泥龄对A2/O工艺脱氮除磷效果的影响[J].环境工程,2007,25(1):16-18.Wang J L,Peng Y Z,Wang S Y.Nitrogen and phosphorus removal performance of A2/O progess as a function of the sludge age[J].Environmental Engineering,2007,25(1):16-18.
[24]范艳明.污泥停留时间对除磷菌种群结构的影响分析[D].天津:天津大学,2013.Fan Y M.Analysis on the influence of SRT on microbial community construture of phosphorus removing bacteria[D].Tianjin:Tianjin University,2013.
[25]姜广萌,潘芳,常青龙,等.污泥停留时间(SRT)对反硝化除磷及污泥特性的影响[J].四川环境,2016,35(6):45-51.Jiang G M,Pan F,Chang Q L,et al.Effect of sludge retention time(SRT)on the denitrification phosphorus removal and sludge characteristics[J].Sichuan Environment,2016,35(6):45-51.
[2]Zeng R J,Lemaire R,Yuan Z G,et al.Simultaneous nitrification,denitrification,and phosphorus removal in a labscale sequencing batch reactor[J].Biotechnology and Bioengineering,2003,84(2):170-178.
[3]Yang Q,Shen N,Lee Z M P,et al.Simultaneous nitrification,denitrification and phosphorus removal(SNDPR)in a full-scale water reclamation plant located in warm climate[J].Water Science and Technology:A Journal of the International Association on Water Pollution Research,2016,74(2):448-456.
[4]冷璐,信欣,鲁航,等.同步硝化反硝化耦合除磷工艺的快速启动及其运行特征[J].环境科学,2015,36(11):4180-4188.Leng L,Xin X,Lu H,et al.Rapid start-up of simultaneous nitrification and denitrification coupled phosphorus removal process and its performing characteristics[J].Environmental Science,2015,36(11):4180-4188.
[5]张万友,张兰河,杨涛,等.不同有机碳源对SBR工艺同步硝化反硝化影响[J].化工进展,2010,29(12):2395-2399.Zhang W Y,Zhang L H,Yang T,et al.Effects of organic carbon on simultaneous nitrification and denitrification in sequencing batch reactor[J].Chemical Industry and Engineering Progress,2010,29(12):2395-2399.
[6]戴娴,王晓霞,彭永臻,等.进水C/N对富集聚磷菌的SNDPR系统脱氮除磷的影响[J].中国环境科学,2015,35(9):2636-2643.Dai X,Wang X X,Peng Y Z,et al.Effect of influent C/N ratio on simultaneous nitrification-denitrification and phosphorus removal(SNDPR)enriched with phosphorus accumulating organisms(PAOs)[J].China Environmental Science,2015,35(9):2636-2643.
[7]赵骥,王晓霞,李夕耀,等.DO浓度对EBPR耦合SND处理低C/N污水的影响[J].中国环境科学,2018,38(1):120-128.Zhao J,Wang X X,Li X Y,et al.Effect of DO concentration on the combination of EBPR and SND for low C/N sewage treatment[J].China Environmental Science,2018,38(1):120-128.
[8]邹联沛,张立秋,王宝贞,et al.MBR中DO对同步硝化反硝化的影响[J].中国给水排水,2001,17(6):10-14.Zou P L,Zhang L Q,Wang B Z,et al.Effect of DO on simultaneous nitrification and denitrification in MBR[J].China Water&Wastewater,2001,17(6):10-14.
[9]李绍峰,崔崇威,黄君礼,et al.DO和HRT对MBR同步硝化反硝化影响研究[J].哈尔滨工业大学学报,2007,39(6):887-890.Li S F,Cui C W,Huang J L,et al.Influence of DO and HRTon simultaneous nitrification and denitrification in MBR[J].Journal of Harbin Institute of Technology,2007,39(6):887-890.
[10]周海东,刘勤亚,张业健.泥龄应用中有关问题的探讨[J].污染防治技术,2003,16(2):13-16.Zhou H D,Liu Q Y,Zhang Y J.Discussion on problems of application of sludge age[J].Pollution Control Technology,2003,16(2):13-16.
[11]李亚静,陈修辉,孙力平,等.不同碳源和泥龄对反硝化聚磷的影响[J].环境工程学报,2010,4(3):513-516.Li Y J,Chen X H,Sun L P,et al.Effect of different carbon sources and SRT on denitrifying phosphorus removal[J].Chinese Journal of Environmental Engineering,2010,4(3):513-516.
[12]王春丽,马放,刘慧,等.泥龄对反硝化除磷效能的影响[J].东北农业大学学报,2007,38(5):637-640.Wang C L,Ma F,Liu H,et al.Effect of SRT on denitrifying dephosphatation[J].Journal of Northeast Agricultural University,2007,38(5):637-640.
[13]Chua A S M,Takabatake H,Satoh H,et al.Production of polyhydroxyalkanoates(PHA)by activated sludge treating municipal wastewater:effect of pH,sludge retention time(SRT),and acetate concentration in influent[J].Water Research,2003,37(15):3602-3611.
[14]韩玮,袁林江,柴璐.长泥龄污水生物除磷系统的除磷效果[J].安全与环境学报,2012,12(5):17-22.Han W,Yuan L J,Chai L.Effects of sludge retention timelength on the biological phosphorus removal[J].Journal of Safety and Environment,2012,12(5):17-22.
[15]左宁,吉芳英.污泥龄对HA-A/A-MCO工艺除磷和污泥特性的影响[J].中国给水排水,2012,28(9):30-34.Zuo N,Ji F Y.Effect of SRT on phosphorus removal and sludge characteristics in HA-A/A-MCO sludge reduction process[J].China Water&Wastewater,2012,28(9):30-34.
[16]国家环境保护局.水和废水监测分析方法[M].(第四版).北京:中国环境科学出版社,2002.
[17]Wang X X,Wang S Y,Zhao J,et al.Combining simultaneous nitrification-endogenous denitrification and phosphorus removal with post-denitrification for low carbon/nitrogen wastewater treatment[J].Bioresource Technology,2016,220:17-25.
[18]Wang X X,Wang S Y,Zhao J,et al.A novel stoichiometries methodology to quantify functional microorganisms in simultaneous(partial)nitrification-endogenous denitrification and phosphorus removal(SNEDPR)[J].Water Research,2016,95:319-329.
[19]廖艳,钟华文,林仲.SRT对短程反硝化除磷的影响研究[J].广州化工,2016,44(2):57-59.Liao Y,Zhong H W,Lin Z.Effect of SRT on short-cut denitrifying phosphorus removal[J].Guangzhou Chemical Industry,2016,44(2):57-59.
[20]Ng W J,Ong S L,Hu J Y.Denitrifying phosphorus removal by anaerobic/anoxic sequencing batch reactor[J].Water Science and Technology:A Journal of the International Association on Water Pollution Research,2001,43(3):139-146.
[21]吴光学,管运涛.SRT及碳源浓度对厌氧/好氧交替运行SBR工艺中PHB的影响[J].环境科学,2005,26(2):126-130.Wu G X,Guan Y T.Effects of SRT and carbon concentration on the PHB in the anaerobic/aerobic alternative operating SBRprocess[J].Environmental Science,2005,26(2):126-130.
[22]郑兴灿,李亚新.污水脱氮除磷技术[M].北京:中国建筑工业出版社,1998.
[23]王建龙,彭永臻,王淑莹.污泥龄对A2/O工艺脱氮除磷效果的影响[J].环境工程,2007,25(1):16-18.Wang J L,Peng Y Z,Wang S Y.Nitrogen and phosphorus removal performance of A2/O progess as a function of the sludge age[J].Environmental Engineering,2007,25(1):16-18.
[24]范艳明.污泥停留时间对除磷菌种群结构的影响分析[D].天津:天津大学,2013.Fan Y M.Analysis on the influence of SRT on microbial community construture of phosphorus removing bacteria[D].Tianjin:Tianjin University,2013.
[25]姜广萌,潘芳,常青龙,等.污泥停留时间(SRT)对反硝化除磷及污泥特性的影响[J].四川环境,2016,35(6):45-51.Jiang G M,Pan F,Chang Q L,et al.Effect of sludge retention time(SRT)on the denitrification phosphorus removal and sludge characteristics[J].Sichuan Environment,2016,35(6):45-51.