AA-BAF连续流反硝化除磷系统的运行性能
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摘要
以生活污水为处理对象,通过室温下的50 d连续运行试验,考察厌氧/缺氧过程耦合曝气生物滤池的双污泥反硝化除磷系统(AA-BAF)的除污染物效能以及运行稳定性。研究结果表明:AA-BAF系统对COD、氨氮和TN具有很好的去除效果,而除磷性能在后期出现恶化。试验期间COD、氨氮和TN的平均去除率分别为87%,99%和79%;试验初期(1~30 d)PO43--P的去除率约为80%,之后迅速降低至试验末的40%以下。进水中的大部分可利用的COD在AA反应器中得到了有效利用,并且BAF出水回流液中的NO3--N在缺氧区内被完全去除。AA反应器出水COD和NO3--N平均质量浓度分别为50 mg/L和0.3 mg/L。当AA反应器出水中NO3--N质量浓度小于0.3 mg/L时,出水PO43--P质量浓度大于0.5 mg/L。完全依靠反硝化除磷的AA-BAF连续流系统处理实际生活污水时,不仅不能保证磷的达标排放,而且不能稳定运行。
A two-sludge system integrated anaerobic/anoxic process with biological aerated filter(AA-BAF) was used to treat real domestic wastewater. To evaluate nutrients removal performance and operational stability, AA-BAF system was operated at room temperature for 50 d continuously. The results show that as high as 87% COD, 99% NH4+-N and 79%TN are removed successfully throughout the experiment. While the obvious deterioration of phosphate removal is observed, decreasing from approximately 80%(1-30 d) to less than 40%. All soluble influent COD is completely consumed in AA reactor for nutrients removal. NO3--N in nitrified liquor from BAF recycled to the anoxic zone is wholly removed. The mean effluent COD and NO3--N are as low as 50 mg/L and 0.3 mg/L respectively. Moreover, when NO3--N concentrations in AA effluent is less than 0.3 mg/L, the effluent PO43--P concentration is above the limit value of 0.5 mg/L. Totally through denitrifying phosphate removal pathway, AA-BAF continuous denitrifying phosphorous removal system treating domestic wastewater can not ensure long term stable operation and efficient phosphate removal.
A two-sludge system integrated anaerobic/anoxic process with biological aerated filter(AA-BAF) was used to treat real domestic wastewater. To evaluate nutrients removal performance and operational stability, AA-BAF system was operated at room temperature for 50 d continuously. The results show that as high as 87% COD, 99% NH4+-N and 79%TN are removed successfully throughout the experiment. While the obvious deterioration of phosphate removal is observed, decreasing from approximately 80%(1-30 d) to less than 40%. All soluble influent COD is completely consumed in AA reactor for nutrients removal. NO3--N in nitrified liquor from BAF recycled to the anoxic zone is wholly removed. The mean effluent COD and NO3--N are as low as 50 mg/L and 0.3 mg/L respectively. Moreover, when NO3--N concentrations in AA effluent is less than 0.3 mg/L, the effluent PO43--P concentration is above the limit value of 0.5 mg/L. Totally through denitrifying phosphate removal pathway, AA-BAF continuous denitrifying phosphorous removal system treating domestic wastewater can not ensure long term stable operation and efficient phosphate removal.
引文
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[16]Zhou Y,Pijuan M,Yuan Z G.Development of a 2-sludge,3-stage system for nitrogen and phosphorous removal from nutrient-rich wastewater using granular sludge and biofilms[J].Water Research,2008,42(12):3207-3217.
[17]Mulkerrins D,Jordan C,Mc Mahon S,et al.Evaluation of the parameters affecting nitrogen and phosphorus removal in anaerobic/anoxic/oxic(A/A/O)biological nutrient removal systems[J].Journal of Chemical Technology Biotechnology,2000,75(4):261-268.
[18]Ahn J,Daidou T,Tsuneda S,et al.Characterization of denitrifying phosphate-accumulating organisms cultivated under different electron acceptor conditions using polymerase chain reaction-denaturing gradient gel electrophoresis assay[J].Water Research,2002,36(2):403-412.
[19]Chung J,Kim Yo,Lee D-J,et al.Characteristics of denitrifying phosphate accumulating organisms in an anaerobic-intermittently aerobic process[J].Environmental Engineering Science,2006,23(6):981-993.
[20]李欣,彭永臻,王建华,等.A2O-BAF与A2O工艺处理较高C/N比生活污水时的污泥沉降性对比分析[J].中南大学学报(自然科学版),2012,43(3):1198-1203.LI Xin,PENG Yongzhen,WANG Jianhua,et al.Comparative analysis of sludge settleability of A2O-BAF process and A2O process treating higher C/N ratio domestic sewage[J].Journal of Central South University(Science and Technology),2012,43(3):1198-1203.
[2]Kerrn-Jespersen J P,Henze M.Biological phosphorus uptake under anoxic and aerobic condition[J].Water Research,1993,27(4):617-624.
[3]Zeng R J,Lemaire R,Yuan Z G,et al.Simultaneous nitrification,denitrification,and phosphorus removal in a lab-scale sequencing batch reactor[J].Biotechnology Bioengineering,2003,84(2):170-178.
[4]Kuba T,van Loosdrecht M C M,Heijnen J J.Phosphorus and nitrogen removal with minimal COD requirement by integration of denitrifying dephosphatation and nitrification in a two-sludge system[J].Water Research,1996,30(7):1702-1710.
[5]Mino T,Van Loosdrecht M C M,Heijnen J J.Microbiology and biochemistry of the enhanced biological phosphate removal process[J].Water Research,1998,32(11):3193-3207.
[6]张耀斌,邢亚斌,荆彦文,等.厌氧-缺氧下反硝化除磷对低碳污水的处理性能研究[J].环境科学,2010,31(10):2360-2364.Zh ANG Yaobin,XING Yabin,JING Yanwen,et al.Treatment of wastewater with low carbon source using denitrifying phosphorus under anaerobic-anoxic conditions[J].Environmental Science,2010,31(10):2360-2364.
[7]王振,袁林江,刘爽.A/A系统反硝化除磷的强化及其稳定性研究[J].环境科学,2009,30(10):2975-2980.WANG Zhen,YUAN Linjiang,LIU Shuang.Improvement of denitrifying dephosphatation in an anaerobic/anoxic sequencing batch reactor and its stability[J].Environmental Science,2009,30(10):2975-2980.
[8]Kapagiannidis A G,Zafiriadis I,Aivasidis A.Effect of basic operating parameters on biological phosphorus removal in a continuous-flow anaerobic-anoxic activated sludge system[J].Bioprocess Biosystems Engineering,2012,35(3):371-382.
[9]Chen Y Z,Peng C Y,Wang J H,et al.Effect of nitrate recycling ratio on simultaneous biological nutrient removal in a novel anaerobic/anoxic/oxic(A2/O)-biological aerated filter(BAF)system[J].Bioresources Technology,2011,102(10):5722-5727.
[10]WANG Jianhua,PENG Yongzhen,CHEN Yongzhi.Advanced nitrogen and phosphorus removal in A2O-BAF system treating low carbon-to-nitrogen ratio domestic wastewater[J].Frontiers of Environmental Science and Engineering in China,2011,5(3):474-480.
[11]Zhang W,Peng Y,Ren N,et al.Improvement of nutrient removal by optimizing the volume ratio of anoxic to aerobic zone in AAO-BAF system[J].Chemosphere,2013,93(11):2859-2863.
[12]Canler J P,Perret J M.Biological aerated filters:Assessment of the process based on 12 sewage treatment plants[J].Water Science and Technology,1994,29(10/11):13-22.
[13]国家环境保护总局.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002:15-25.State Environmental Protection Administration of China.Monitoring and analysis methods of water and wastewater[M].4th ed.Beijing:China Environmental Science Press,2002:15-25.
[14]李凌云,彭永臻,李论,等.活性污泥系统比耗氧速率在线检测与变化规律[J].化工学报,2010,61(4):995-1000.LI Lingyun,PENG Yongzhen,LI Lun,et al.On-line determination and variations of specific oxygen uptake rate in activated sludge system[J].CIESC Journal,2010,61(4):995-1000.
[15]吴昌永,彭永臻,彭轶.A2O工艺处理低C/N比生活污水的试验研究[J].化工学报,2008,59(12):3126-3131.WU Changyong,PENG Yongzhen,PENG Yi.Biological nutrient removal in A2O process when treating low C/N ratio domestic wastewater[J].Journal of Chemical Industry and Engineering(China),2008,59(12):3126-3131.
[16]Zhou Y,Pijuan M,Yuan Z G.Development of a 2-sludge,3-stage system for nitrogen and phosphorous removal from nutrient-rich wastewater using granular sludge and biofilms[J].Water Research,2008,42(12):3207-3217.
[17]Mulkerrins D,Jordan C,Mc Mahon S,et al.Evaluation of the parameters affecting nitrogen and phosphorus removal in anaerobic/anoxic/oxic(A/A/O)biological nutrient removal systems[J].Journal of Chemical Technology Biotechnology,2000,75(4):261-268.
[18]Ahn J,Daidou T,Tsuneda S,et al.Characterization of denitrifying phosphate-accumulating organisms cultivated under different electron acceptor conditions using polymerase chain reaction-denaturing gradient gel electrophoresis assay[J].Water Research,2002,36(2):403-412.
[19]Chung J,Kim Yo,Lee D-J,et al.Characteristics of denitrifying phosphate accumulating organisms in an anaerobic-intermittently aerobic process[J].Environmental Engineering Science,2006,23(6):981-993.
[20]李欣,彭永臻,王建华,等.A2O-BAF与A2O工艺处理较高C/N比生活污水时的污泥沉降性对比分析[J].中南大学学报(自然科学版),2012,43(3):1198-1203.LI Xin,PENG Yongzhen,WANG Jianhua,et al.Comparative analysis of sludge settleability of A2O-BAF process and A2O process treating higher C/N ratio domestic sewage[J].Journal of Central South University(Science and Technology),2012,43(3):1198-1203.