硝态氮及碳源浓度对A-AAO工艺厌氧释磷影响的研究
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摘要
为进一步提高A-AAO工艺的厌氧释磷效率,本文以稳定运行A-AAO工艺的污泥为研究对象,考察碳源浓度和污泥回流液硝态氮浓度对厌氧释磷速率的影响。研究结果表明:污泥回流液硝氮浓度越高,厌氧释磷速率越缓慢,且最大释磷量也较低,硝氮浓度从0 mg/L增加到20 mg/L时,释磷速率从0.150 mg TP/(gMLVSS·min)降低到0.103 mgTP/(gMLVSS·min),最大释磷量也从23.95 mg/L减少到15.97 mg/L。碳源浓度显著影响了厌氧区最大释磷量,进水碳源浓度(以乙酸钠投加计算)分别为100,200和300 mg/L,最大释磷总量分别为10.59 mg/L,19.62 mg/L及25.48 mg/L。
The effect of nitrate nitrogen and carbon source concentration on anaerobic phosphorus release was investigated in this paper to improve the efficiency of the activated sludge anaerobic phosphorus release of the Modified A-AAO process. Results showed that higher nitrate concentration result in slower the anaerobic phosphorus release rate and lower phosphorus release content. When the concentration of nitrate nitrogen increased from 0 mg/L to 20 mg/L,the phosphorus release rate reduced from 0. 150 mg TP/( gMLVSS·min) to around 0. 103 mgTP/( g MLVSS·min),and the largest amount of phosphorus release also reduced from 23. 95 mg/L to 15. 97 mg/L. The concentration of carbon source significantly affected the maximum phosphorus release in anaerobic zone,the largest total phosphorus release were 10. 59 mg/L,19. 62 mg/L and 25. 48 mg/L when the concentration of carbon source was 100,200 and 300 mg/L( sodium acetate),respectively.
The effect of nitrate nitrogen and carbon source concentration on anaerobic phosphorus release was investigated in this paper to improve the efficiency of the activated sludge anaerobic phosphorus release of the Modified A-AAO process. Results showed that higher nitrate concentration result in slower the anaerobic phosphorus release rate and lower phosphorus release content. When the concentration of nitrate nitrogen increased from 0 mg/L to 20 mg/L,the phosphorus release rate reduced from 0. 150 mg TP/( gMLVSS·min) to around 0. 103 mgTP/( g MLVSS·min),and the largest amount of phosphorus release also reduced from 23. 95 mg/L to 15. 97 mg/L. The concentration of carbon source significantly affected the maximum phosphorus release in anaerobic zone,the largest total phosphorus release were 10. 59 mg/L,19. 62 mg/L and 25. 48 mg/L when the concentration of carbon source was 100,200 and 300 mg/L( sodium acetate),respectively.
引文
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[3]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.
[4]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.
[5]Tsuneda S,Ohno T,Soejima K,et al.Simultaneous nitrogen and phosphorus removal using denitrifying phosphateaccumulating organisms in a sequencing batch reactor[J].Biochemical Engineering Journal,2006,27(3):191-196.
[6]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.
[7]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.
[8]王社平,李立军,程晓波,等.城市污水处理厂改良AAO工艺除磷效果影响因素分析及对策[J].水处理技术,2015(3):81-85.
[9]李立军.改良型AAO工艺在城市污水处理厂中的应用研究[D].西安:西安建筑科技大学,2015.
[10]张渝.A2/O及其变型工艺脱氮除磷试验研究[D].西安:长安大学,2014.
[11]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.
[12]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.
[13]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.
[14]颉亚玮,年跃刚,殷勤,等.不同废水为碳源对污泥厌氧释磷效果的影响[J].给水排水,2012(1):72-76.
[15]董晓清,吕小梅,李继,等.反硝化除磷污泥的厌氧释磷与缺氧吸磷特性研究[J].环境保护科学,2014,40(4):10-14.
[16]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.
[17]张强,陈建平,卢龙.碳源对聚磷菌厌氧释磷影响的研究进展[J].江西科学,2010(5):614-617.
[18]王发珍,李天增,刘金泉.污泥厌氧释磷试验研究[J].环境工程,2009(1):174-176.