碳源对低温A~2O工艺反硝化除磷的影响

赫俊国¹, 姜涛¹, 杨晓南¹, 左金龙², 吕炳南¹, 张杰¹

1.哈尔滨工业大学市政环境工程学院;2.哈尔滨商业大学环境工程系



摘要:

为丰富低温污水脱氮除磷途径并了解碳源对A2O工艺反硝化除磷的影响程度,采用单独的乙酸钠、丙酸钠及其混合物对A2O工艺处理低温污水时厌氧释磷与缺氧反硝化吸磷过程进行研究.结果表明,在水温为10～12℃、HRT为8 h、污泥回流比为50%和硝化液回流比为150%～250%的条件下,不同碳源时厌氧释磷与缺氧吸磷速率差异较大.乙酸钠每克MLSS释磷与反硝化吸磷速率分别为6.3和2.8 mg.h-1,而丙酸钠以及混合基质时每克MLSS释磷速率分别为3.44和5.56 mg.h-1,每克MLSS反硝化吸磷速率分别为2.05和3.81 mg.h-1.另外,不同碳源时厌氧阶段聚磷菌合成PHA的组成差别较大,丙酸钠能够促进PH2MV比例,从而提高反硝化聚磷菌对硝态氮电子受体的利用效率.脱氮除磷效率和硝态氮利用率的综合比较可以看出,乙酸钠、丙酸钠混合基质更适宜于低温污水的反硝化除磷作用.

关键词:  反硝化除磷  A2O工艺  胞内聚合物  低温

DOI：10.11918/j.issn.0367-6234.2011.04.007

分类号:X703.1

基金项目:国家水体污染控制与治理科技重大专项(2008ZX07207-005-02);国家科技支撑计划项目(2006BAJ03A05-01)



Influence of carbon source on the denitrifying phosphorus removal in A~2O process at low temperature

HE Jun-guo¹, JIANG Tao¹, YANG Xiao-nan¹, ZUO Jin-long², Lü Bing-nan¹, ZHANG Jie¹

1.School of Municipal and Environmental Engineering,Harbin Institute of Technology,150090 Harbin,China;2.Department of Environmental Engineering,Harbin University of Commerce,150076 Harbin,China

Abstract:

To enrich the nutrients removal pathway and investigate the influence of carbon source on denitrifying phosphorus removal at low temperature(10-12 ℃),a lab-scale A2O reactor was employed to study the process of phosphorus release and denitrifying phosphorus removal with sodium acetate,sodium propionate and their compounds as carbon source.At hydraulic retention time of 8 h,sludge recirculation ratio and inner recirculation ratio of 50% and 150%-250%,the differences of specific phosphorus release rate and the subsequent phosphorus uptake efficiency with different carbon source were obviously.The specific phosphorus release rate and the phosphorus uptake rate was 6.3 and 2.8 mg·h-1 with sodium acetate as substrate.However,the specific phosphorus release rate of sodium propionate and the compounds was 3.44 and 5.56 mg·h-1.The phosphorus uptake rate was 2.05 and 3.81 mg·h-1,respectively.On the other hand,the intracellular polymers synthesized by phosphorus accumulating organisms were varied with different carbon source.The content of PH2MV was improved by the sodium propionate which consequently increased the utilization efficiency of nitrate nitrogen by denitrification PAOs.The compounds of sodium acetate and sodium propionate were considered as the more suitable carbon source for denitrifying phosphorus removal of low temperature wastewater.

Key words:  denitrifying phosphorus removal  A2O process  intracellular polymers  low temperature