传统和氧化沟型A~2/O工艺脱氮除磷性能对比
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摘要
为了对比研究传统A~2/O工艺和氧化沟型A~2/O工艺的脱氮除磷性能,通过实验分析了2种工艺在不同水力停留时间、不同混合液回流比、不同污泥回流比、不同污泥浓度条件下的脱氮除磷效果及典型工况下的污染物去除过程。结果表明,2种工艺在大多数情况下均可实现良好的脱氮除磷性能,出水COD、NH_4~+-N、TN和TP等各项水质指标均可满足《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A要求。在传统A~2/O工艺的缺氧段发生了反硝化除磷反应,在氧化沟型A~2/O工艺中则未发生。
In order to investigate and compare the pollutant removal effects of the traditional anaerobic/anoxic/oxic(A~2/O) process and the modified A~2/O process which was operated as the oxidation ditch mode, the performances of nitrogen and phosphorus removal for the two A~2/O processes under different hydraulic retention times, different mixed liquor/activated sludge reflux ratios and different mixed liquor suspended solids were experimentally studied.Meanwhile, the biochemical reactions during the typical operation cycles were analyzed for both the two A~2/O processes. The results showed that satisfied performances of nitrogen and phosphorus removal were achieved in both the two A~2/O processes under the most of the operational conditions, the obtained COD, NH_4~+-N, TN and TP concentrations in effluent could meet the demands of standard A of the first class in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). Further, the anoxic denitrifying phosphorus removal reaction was observed in the conventional A~2/O process, but was not observed in the modified A~2/O process.
In order to investigate and compare the pollutant removal effects of the traditional anaerobic/anoxic/oxic(A~2/O) process and the modified A~2/O process which was operated as the oxidation ditch mode, the performances of nitrogen and phosphorus removal for the two A~2/O processes under different hydraulic retention times, different mixed liquor/activated sludge reflux ratios and different mixed liquor suspended solids were experimentally studied.Meanwhile, the biochemical reactions during the typical operation cycles were analyzed for both the two A~2/O processes. The results showed that satisfied performances of nitrogen and phosphorus removal were achieved in both the two A~2/O processes under the most of the operational conditions, the obtained COD, NH_4~+-N, TN and TP concentrations in effluent could meet the demands of standard A of the first class in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). Further, the anoxic denitrifying phosphorus removal reaction was observed in the conventional A~2/O process, but was not observed in the modified A~2/O process.
引文
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[35]王淑莹,委燕,马斌.控制污水生物处理过程中N2O的释放[J].环境科学与技术,2014,37(7):78-84.
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[2]NIU M F,LIU Z Y,LI Z P,et al.Study on the influence factors of the improved A2/O process used in swine wastewater treatment[J].Advanced Materials Research,2011,183:778-782.DOI:10.4028/www.scientific.net/AMR.183-185.778.
[3]BAEK G,CHEON S P,KIM S,et al.Modular neural networks prediction model based A2/O process control system[J].International Journal of Precision Engineering and Manufacturing,2012,13(6):905-913.DOI:10.1007/s12541-012-0118-z.
[4]JIN L,ZHANG G,TIAN H.Current state of sewage treatment in China[J].Water Research,2014,66:85-98.DOI:10.1016/j.watres.2014.08.014.
[5]丁晓倩,赵剑强.GPS-X模拟的三种A2/O工艺脱氮除磷效果比较[J].中国给水排水,2016,32(19):26-30.
[6]刘伟京,张龙,张双圣,等.两点进水条件下多种A2/O工艺的运行效果[J].环境工程学报,2011,5(6):1294-1296.
[7]王社平,黄宁俊,邵军峰,等.倒置A2/O工艺对城市污水的处理效果分析[J].中国给水排水,2011,27(21):59-62.
[8]龚维辉,邹勇斌,熊兵,等.氧化沟型A2/O工艺设计改造[J].环境工程,2015,33(1):45-48.DOI:10.13205/j.hjgc.201501011.
[9]张洪荣,周鑫.多模式A2/O氧化沟工艺运行中的不足及改进方法[J].工业水处理,2012,32(5):92-93.DOI:10.3969/j.issn.1005-829X.2012.05.027.
[10]LOVLEY D R,PHILLIPS E J P.Novel mode of microbial energy metabolism:Organic carbon oxidation coupled to dissimilatory reduction of iron or manganese[J].Applied and Environmental Microbiology,1988,54(6):1472-1480.
[11]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.
[12]张中和.给水排水设计手册:第5册城镇排水[M].北京:中国建筑工业出版社,2004.
[13]中华人民共和国建设部.城镇污水处理厂运行、维护及安全技术规程:CJJ 60-2011[S].北京:中国建筑工业出版社,2011.
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[15]王舜和,邓胜琳,姜宝媛.多模式A2/O工艺的运行模式与设计要点[J].水处理技术,2014,40(8):107-110.
[16]吴昌永,彭永臻,王然登,等.溶解氧浓度对A2/O工艺运行的影响[J].中国给水排水,2012,28(3):5-9.
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[18]李永峰,潘欣语,杨建宇,等.A2/O工艺中HRT对系统脱氮除磷效率的影响[J].哈尔滨商业大学学报(自然科学版),2011,27(4):565-570.
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[21]WANG X L,WANG S Y,PENG Y Z.Anoxic bioliogical phosphorus uptake in A2/O process[J].Chinese Journal of Chemical Engineering,2005,13(4):516-521.
[22]彭轶,彭永臻,吴昌永,等.A2/O工艺中的反硝化除磷[J].环境工程学报,2008,2(6):752-756.
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[25]HENZE M,GUJER W,MINO T,et al.Scientific and technical report No 9:Activated sludge models ASM1,ASM2,ASM2d and ASM3.IWA task group on mathematical modelling for design and operation of biological wastewater treatment[R].London:IWA Publishing,2000.
[26]DING X,ZHAO J,HU B,et al.Mathematical modeling of nitrous oxide(N2O)production in anaerobic/anoxic/oxic processes:Improvements to published N2O models[J].Chemical Engineering Journal,2017,325:386-395.DOI:10.1016/j.cej.2017.05.082.
[27]曾薇,李磊,杨莹莹,等.A2O工艺处理生活污水反硝化除磷研究[J].北京工业大学学报,2011,37(9):1407-1415.
[28]KUBA T,SMOLDERS G,VAN-LOOSDRECHT M C M,et al.Phosphorus removal from wastewater by anaerobic-anoxic sequencing batch reactor[J].Water Science and Technology,1993,27(5/6):241-252.
[29]WACHTMEISTER A,KUBA T,VAN LOOSDRECHT M C M,et al.A sludge characterization assay for aerobic and denitrifying phosphorus removing sludge[J].Water Research,1997,31(3):471-478.DOI:10.1016/S0043-1354(96)00281-3.
[30]彭永臻,侯红勋,孙洪伟,等.A2/O氧化沟工艺中NO3-对生物除磷影响[J].哈尔滨工业大学学报,2008,40(8):1311-1314.
[31]吴昌永,彭永臻,彭轶.A2/O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.
[32]陈永志,彭永臻,王建华,等.内循环对A2/O-曝气生物滤池工艺脱氮除磷特性影响[J].环境科学,2011,32(1):193-198.
[33]SCHALK-OTTE S,SEVIOUR R J,KUENEN J G,et al.Nitrous oxide(N2O)production by Alcaligenes faecalis during feast and famine regimes[J].Water Research,2000,34(7):2080-2088.DOI:10.1016/S0043-1354(99)00374-7.
[34]王亚宜,周东,赵伟,等.污水生物处理实际工艺中氧化亚氮的释放:现状与挑战[J].环境科学学报,2014,34(5):1079-1088.
[35]王淑莹,委燕,马斌.控制污水生物处理过程中N2O的释放[J].环境科学与技术,2014,37(7):78-84.
[36]MEYER R L,ZENG R J,GIUGLIANO V,et al.Challenges for simultaneous nitrification,denitrification,and phosphorus removal in microbial aggregates:Mass transfer limitation and nitrous oxide production[J].FEMS Microbiol Ecology,2005,52(3):329-338.DOI:10.1016/j.femsec.2004.11.011.