摘要
在常温条件下,采用A2O工艺处理低C/N比实际生活污水,通过控制好氧区DO为0.3～0.5mg/L以及增大系统内回流比以降低好氧实际水力停留时间(AHRT),成功启动并维持了短程硝化反硝化;系统亚硝态氮积累率稳定维持在90%左右.在C/N比仅为2.34的情况下,短程硝化系统对总氮(TN)的去除率高达75.4%.通过对不同碳源类型、不同硝化类型以及不同DO水平下A2O系统脱氮效率的比较研究发现,低氧短程硝化反硝化阶段与外加碳源的全程硝化反硝化阶段的TN去除率相当.同时研究表明,低DO运行并不会导致A2O工艺发生污泥膨胀.当接种污泥为膨胀污泥时,控制DO在0.3～0.5mg/L反而有助于改善污泥沉降性能和出水水质.
At normal temperature,a lab-scale A2O process was operated for the treatment of domestic wastewater with low C/N ratios.Short-cut nitrification and denitrification was achieved by controlling low DO concentration of 0.3～0.5mg/L and higher internal recycle ratios to decrease the actual aerobic hydraulic retention time （HRT）.The average nitrite accumulation rate reached about 90%.When the C/N ratio was 2.34,about 75.4% of TN could be removed in the short-cut nitrification A2O process.The effects of different carbon sources,nitrification types and DO levels on nitrogen removal efficiencies in the A2O process were also investigated.The experimental results showed that the short-cut nitrification at low DO concentrations had the same TN removal efficiency as the complete nitrification with the extra carbon sources.Moreover,the activated sludge settling characteristics did not deteriorate.Even when the seed sludge was bulking sludge,sludge settling and treatment performance was improved under low DO conditions （0.3～0.5mg/L）.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2010年第5期625-632,共8页
China Environmental Science
基金
国家自然科学基金资助项目(50878005)
北京市自然科学基金资助项目(8102005)
北京市优秀人才培养资助计划(20081D0-501500178)
关键词
A2O工艺
短程硝化反硝化
生活污水
A2O process
short-cut nitrification and denitrification
domestic wastewater
