硝态氮为惟一氮源时异养微生物增长特性  

Growth characteristics of heterotrophic bacteria with nitrate as a sole nitrogen source

作　　者：郭瑜[1] 彭党聪[1] 张新艳[1] 杨翠[1] 李惠娟[1] 于莉芳[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《环境工程学报》2014年第3期882-886,共5页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07317-009);陕西省教育厅重点实验室科学研究计划项目(11JS055)

摘　　要：采用SBR研究了缺氧条件下硝态氮为惟一氮源时异养微生物的增长特性。结果表明,异养微生物能利用硝态氮作为氮源进行增殖。当进水COD浓度为1 400 mg/L,硝态氮浓度为280 mg/L时,COD和硝态氮的去除率分别达到97%和99%;污泥中微生物的含氮量为8.8%,低于常规利用氨氮作为氮源的微生物;在实验条件下活性污泥的产率系数为0.30 g VSS/g COD。反硝化菌可利用硝态氮作为氮源进行细胞合成对含硝氮的废水处理具有重要意义。一方面由于无需投加氨氮降低了废水处理成本,另一方面由于污泥产率低,降低了污泥处理成本。Heterotrophic growth with nitrate as sole nitrogen source was investigated in anoxic SBR which was fed with 1 400 mg/L of COD and 280 mg/L of nitrate. Results showed that heterotrophic bacteria could grow with nitrate as nitrogen source. The removal rates of COD and nitrate were 97% and 99%,respectively. Nitrogen content of bacteria in activated sludge was 8. 8%,which was lower than that of bacteria with ammonium as nitrogen source. Yield coefficient of activated sludge was 0. 30 g VSS/g COD. Nitrate as nitrogen source for growth of denitrifying bacteria is important for the biological treatment of wastewater consisting of nitrate. It saves economic cost without dosing ammonia nitrogen,and it also decreases the cost for treatment excess sludge with lower sludge yield.

关 键 词：异养微生物 反硝化 氮源 硝态氮 

分 类 号：X703[环境科学与工程—环境工程]