A~2O工艺和A~2O+BCO工艺的脱氮除磷性能比较
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摘要
以实际低C/N生活污水为研究对象,依次分别采用A~2O工艺和A~2O+BCO(生物接触氧化)工艺考察系统的脱氮除磷性能.试验在进水负荷和运行参数基本维持不变的情况下运行134d.结果表明,相对于A~2O系统,A~2O+BCO系统由于采用双污泥工艺,硝化菌和聚磷菌(PAOs)污泥龄分离,同时反硝化除磷"一碳两用",碳源利用率更高,TN和TP去除率分别提高了18%和28%.其次FISH试验表明,在稳定运行的A~2O+BCO工艺中,PAOs比例为22%,远远超过A~2O中7%的比例,从微生物角度证明了脱氮除磷效果好的原因.
A~2O and A~2O+BCO process were employed to treat domestic wastewater with low carbon to nitrogen ratio(C/N=3.96) to compare their nutrient removal performance,respectively. The influent loading and operation condition were kept consistent for 134 days, A~2O+BCO system achieved a higher nitrogen and phosphorus removal efficiency than A~2O system because of the application of denitrifying phosphorus removal technology and two-sludge theory, which could use carbon resource more efficiently and solve the SRT contradiction between nitrifiers and PAOs. PAOs accounts for 22% in the stable A~2O+BCO system higher than 7% in the A~2O system, which explain the mechanism for the superior nutrient removal performance.
A~2O and A~2O+BCO process were employed to treat domestic wastewater with low carbon to nitrogen ratio(C/N=3.96) to compare their nutrient removal performance,respectively. The influent loading and operation condition were kept consistent for 134 days, A~2O+BCO system achieved a higher nitrogen and phosphorus removal efficiency than A~2O system because of the application of denitrifying phosphorus removal technology and two-sludge theory, which could use carbon resource more efficiently and solve the SRT contradiction between nitrifiers and PAOs. PAOs accounts for 22% in the stable A~2O+BCO system higher than 7% in the A~2O system, which explain the mechanism for the superior nutrient removal performance.
引文
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[21]Chen Y,Li B,Ye L,et al.The combined effects of COD/N ratio and nitrate recycling ratio on nitrogen and phosphorus removal in anaerobic/anoxic/aerobic(A2/O)-biological aerated filter(BAF)systems[J].Biochemical Engineering Journal,2015,93:235-242.
[22]Zhang W T,Peng Y Z,Ren N Q,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.
[23]Zhao W H,Wang M X,Huang Y,et al.Denitrifying phosphorus removal optimization in the pre-A2NSBR system:nitrate recycling,carbon/nitrogen ratio and carbon source type[J].Front.Environ.Sci.Eng.2018,12(5):8.
[24]赵伟华,王梅香,吕冬梅,等.前置A2NSBR工艺系统的启动特性研究.中国环境科学[J].2016,36(9):2689-2695.Zhao Weihua,Wang Meixiang,Lv Dongmei,et al.Start-up characteristics of the pre-A2NSBR Process.China Environmental Science[J].2016,36(9):2689-2695.
[2]Kapagiannidis A G,Zafiriadis I,Aivasidis A.Upgrading the efficiency of an external nitrification BNR system-The modified Dephanox process[J].Chemical Engineering Journal,2011,175:124-135.
[3]Sorm R,Bortone G,Saltarelli R,et al.Phosphate uptake under anoxic conditions and fixed-film nitrification in nutrient removal activated sludge system[J].Water Research,1996,30(7):1573-1584.
[4]毕学军,张波.倒置A2/O工艺生物脱氮除磷原理及其生产应用[J].环境工程,2006,(3):29-30.Bi Xuejun,Zhang Bo.The principle and full-scale application of reversed A2O process for removing nitrogen and phosphorus[J].Environmental Engineering,2006,(3):29-30.
[5]Zeng W,Bai X,Zhang L,et al.Population dynamics of nitrifying bacteria for nitritation achieved in Johannesburg(JHB)process treating municipal wastewater[J].Bioresource Technology,2014,162:30-37.
[6]Kapagiannidis A G,Zafiriadis I,Aivasidis A.Comparison between UCT type and DPAO biomass phosphorus removal efficiency under aerobic and anoxic conditions[J].Water Science and Technology,2009,60(10):2695-2703.
[7]王聪,王淑莹,张淼,等.硝化液回流比对A2/O-BCO工艺反硝化除磷特性的影响[J].中国环境科学,2014,(11):2844-2850.Wang Cong,Wang Shuying,Zhang Miao,et al.Effect of nitrate recycling ratio on denitrifying phosphorus removal characteristics in A2/O-BCOprocess[J].China Environmental Science,2014,(11):2844-2850.
[8]Kuba T,Vanloosdrecht 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.
[9]Zilles J L,Peccia J,Kim M W,et al.Involvement of Rhodocyclusrelated organisms in phosphorus removal in full-scale wastewater treatment plants[J].Appled and Envionmental Microbiology,2002,68(6):2763-2769.
[10]张杰,臧景红,杨宏,等.A2/O工艺的固有缺欠和对策研究[J].给水排水,2003,29(3):22-26.Zhang Jie,Zang Jinghong,Yang Hong,et al.A Study on the inherent shortcomings and countermeasures of the A2/O process[J].2003,29(3):22-26.
[11]张淼,彭永臻,王聪,等.三段式硝化型生物接触氧化反应器的启动及特性[J].中国环境科学,2015,(1):101-109.Zhang Miao,Peng Yongzhen,Wang Cong,et al.The start-up and characterization of a three-stage nitrification biological contact oxidation reactor[J].China Environmental Science,2015,(1):101-109.
[12]Guo J,Ma F,Chang C,et al.Start-up of a two-stage bioaugmented anoxic-oxic(A/O)biofilm process treating petrochemical wastewater under different DO concentrations[J].Bioresource Technology,2009,100(14):3483-3488.
[13]Malsumoto S,Terada A,Tsuneda S.Modeling of membrane-aerated biofilm:Effects of C/N ratio,biofilm thickness and surface loading of oxygen on feasibility of simultaneous nitrification and denitrification[J].Biochemical Engineering Journal,2007,37(1):98-107.
[14]Grisa A M C,Paese C,Dotto O J,et al.Chemometric analysis of an sanitary landfill leachate[J].Journal of Water Resource and Protection,2012,04(1):16-24.
[15]李银波,周少奇,邱育真,等.回流比对投料A2/O工艺脱氮除磷影响的中试研究[J].环境科学与技术,2010,(2):142-145.Li Yinbo,Zhou Shaoqi,Qiu Yuzhen,et al.Effect of mixed-liquid return ratio on A2/O Process Performance[J].Environmental Science&Technology.2010,(2):142-145.
[16]杨小梅,邓猛,王羽华,等.硝化液回流比对A2/O-MBBR工艺反硝化除磷效果的影响[J].环境工程,2015,33(8):13-16,41.Yang Xiaomei,Deng Meng,Wang Yuhua,et al.Effect of nitrification liquid reflux ratio on denitrifying phosphorus removal in an A2/O-MBBRprocess[J].Environmental Engineering,2015,33(8):13-16,41.
[17]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(A(2)/O)-biological aerated filter(BAF)system[J].Bioresource Technology,2011,102(10):5722-5727.
[18]Wang Y Y,Peng Y Z,Stephenson T.Effect of influent nutrient ratios and hydraulic retention time(HRT)on simultaneous phosphorus and nitrogen removal in a two-sludge sequencing batch reactor process[J].Bioresource Technology,2009,100(14):3506-3512.
[19]Hu Z R,Wentzel M C,Ekama G A.Anoxic growth of phosphateaccumulating organisms(PAOs)in biological nutrient removal activated sludge systems[J].Water Research,2002,36(19):4927-4937.
[20]Zhao W H,Zhang Y,Lv D M,et al.Advanced nitrogen and phosphorus removal in the pre-denitrification anaerobic/anoxic/aerobic nitrification sequence batch reactor(preA2NSBR)treating low carbon/nitrogen(C/N)wastewater[J].Chemical Engineering Journal,2016,(302):296-304.
[21]Chen Y,Li B,Ye L,et al.The combined effects of COD/N ratio and nitrate recycling ratio on nitrogen and phosphorus removal in anaerobic/anoxic/aerobic(A2/O)-biological aerated filter(BAF)systems[J].Biochemical Engineering Journal,2015,93:235-242.
[22]Zhang W T,Peng Y Z,Ren N Q,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.
[23]Zhao W H,Wang M X,Huang Y,et al.Denitrifying phosphorus removal optimization in the pre-A2NSBR system:nitrate recycling,carbon/nitrogen ratio and carbon source type[J].Front.Environ.Sci.Eng.2018,12(5):8.
[24]赵伟华,王梅香,吕冬梅,等.前置A2NSBR工艺系统的启动特性研究.中国环境科学[J].2016,36(9):2689-2695.Zhao Weihua,Wang Meixiang,Lv Dongmei,et al.Start-up characteristics of the pre-A2NSBR Process.China Environmental Science[J].2016,36(9):2689-2695.
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