延长缺氧水力停留时间对A-AAO工艺氮磷去除影响的研究
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摘要
相比传统厌氧-缺氧-好氧(简称AAO)脱氮除磷工艺,改良AAO工艺(定义为A-AAO)增加了回流污泥的硝酸盐反硝化区并对进水多点分配,氮磷去除能力得到显著提高。为进一步优化A-AAO的除污染能力,本研究以A-AAO工艺后2部分缺氧和好氧段(AO段)为对象,研究AO段水力停留时间改变对A-AAO工艺脱氮除磷的影响。试验采用两套小试规模A-AAO工艺(定义为1#和2#反应器)开展研究,1#反应器缺氧段及好氧段停留时间分别为5.5 h和10 h,2#反应器缺氧段及好氧段停留时间分别为2.5 h和13 h。研究结果表明:总停留时间不变,缩短好氧停留时间而延长缺氧停留时间有助于氮磷的去除。1#和2#反应器总氮和总磷平均去除率分别为61.36%、57.08%和85.72%、82.0%。
Compared with the traditional anaerobic-anoxic-aerobic(AAO) denitrification and phosphorus removal process,the modified A-AAO process(defined as A-AAO) increases nitrate denitrifying zone of reflux sludge and multipoint distribution,which improves denitrification and phosphorus removal significantly. In order to optimize pollution removal of the A-AAO process further,the hydraulic retention time of the anoxic and aerobic zone of the Modified A-AAO has been studied as the objects of this study. Two lab-scale Modified A-AAO processes were operated. The anoxic and aerobic retention time of 1# reactor are 5. 5 h and 10 h respectively,and the two parameters of 2# reactor are 2. 5 h and 13 h respectively. The research results show that to shorten the aerobic hydraulic retention time and to prolong the anoxic hydraulic retention time is beneficial to nitrogen and phosphorus removal. The mean total nitrogen removal and the mean total phosphorus removal of 1# and 2# reactor were 61. 36%,57. 08% and 85. 72%,82. 0%,respectively.
Compared with the traditional anaerobic-anoxic-aerobic(AAO) denitrification and phosphorus removal process,the modified A-AAO process(defined as A-AAO) increases nitrate denitrifying zone of reflux sludge and multipoint distribution,which improves denitrification and phosphorus removal significantly. In order to optimize pollution removal of the A-AAO process further,the hydraulic retention time of the anoxic and aerobic zone of the Modified A-AAO has been studied as the objects of this study. Two lab-scale Modified A-AAO processes were operated. The anoxic and aerobic retention time of 1# reactor are 5. 5 h and 10 h respectively,and the two parameters of 2# reactor are 2. 5 h and 13 h respectively. The research results show that to shorten the aerobic hydraulic retention time and to prolong the anoxic hydraulic retention time is beneficial to nitrogen and phosphorus removal. The mean total nitrogen removal and the mean total phosphorus removal of 1# and 2# reactor were 61. 36%,57. 08% and 85. 72%,82. 0%,respectively.
引文
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[16]Ma Y,Peng Y,Wang X.Improving nutrient removal of the AAO process by an influent bypass flow by denitrifying phosphorus removal[J].Desalination,2009,246:534-544.
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[18]Peng Y,Ge S.Enhanced nutrient removal in three types of step feeding process from municipal wastewater[J].Bioresource Technology,2011,102(11):6405-6413.
[2]熊红权,李文彬.CASS工艺在国内的应用现状[J].中国给水排水.2003(2):34-35.
[3]肖文涛.污水生物脱氮除磷工艺的现状与发展[J].环境保护与循环经济,2010,30(11):59-62.
[4]陈志强,赖后伟,温沁雪,等.阿莫西林对制药园区污水厂A~2O工艺脱氮除磷的影响[J].哈尔滨工业大学学报.2014(2):33-37.
[5]金羽.温度对A~2/O系统的影响特征及脱氮除磷强化技术研究[D].哈尔滨工业大学,2013.
[6]Zeng W,Li L,Yang Y,et al.Denitrifying phosphorus removal and impact of nitrite accumulation on phosphorus removal in a continuous anaerobic-anoxic-aerobic(A2O)process treating domestic wastewater[J].Enzyme and Microbial Technology,2011,48(2):134-142.
[7]王伟,彭永臻,殷芳芳,等.改进分段进水A/O生物脱氮工艺强化生物除磷[J].环境科学,2009(10):2968-2974.
[8]孙孝龙,蒋文举,张进,等.改良A~2/O工艺预缺氧池中的脱氮作用和机理[J].环境科学与技术,2009,32(12):138-141.
[9]Ge S,Zhu Y,Lu C,et al.Full-scale demonstration of step feed concept for improving an anaerobic/anoxic/aerobic nutrient removal process[J].Bioresource Technology,2012,120:305-313.
[10]荣宏伟,陈志强,吕炳南.有机碳源对生物除磷的影响[J].南京理工大学学报(自然科学版),2004(4):440-444.
[11]Wang W,Wang S,Peng Y,et al.Enhanced Biological Nutrients Removal in Modified Step-feed Anaerobic/Anoxic/Oxic Process[J].Chinese Journal of Chemical Engineering,2009,17(5):840-848.
[12]史静,吕锡武.厌氧释磷量和温度对反硝化聚磷的影响[J].化工学报,2010,61(1):166-171.
[13]徐微,吕锡武.反硝化聚磷污泥厌氧释磷影响因素研究[J].安全与环境工程,2009(3):26-29.
[14]Shi H,Lee C.Combining anoxic denitrifying ability with aerobic-anoxic phosphorus-removal examinations to screen denitrifying phosphorus-removing bacteria[J].International Biodeterioration&Biodegradation,2006,57(2):121-128.
[15]Li B,Zhang T.Biodegradation and Adsorption of Antibiotics in the Activated Sludge Process[J].Environmental Science&Technology,2010,44(9):3468-3473.
[16]Ma Y,Peng Y,Wang X.Improving nutrient removal of the AAO process by an influent bypass flow by denitrifying phosphorus removal[J].Desalination,2009,246:534-544.
[17]Kim D,Lee D,Keller J.Effect of temperature and free ammonia on nitrification and nitrite accumulation in landfill leachate and analysis of its nitrifying bacterial community by FISH[J].Bioresource Technology,2006,97(3):459-468.
[18]Peng Y,Ge S.Enhanced nutrient removal in three types of step feeding process from municipal wastewater[J].Bioresource Technology,2011,102(11):6405-6413.