摘要
采用改良的Orbal氧化沟中试系统处理低C/N值生活污水,考察了溶解氧浓度对同步硝化反硝化(SND)的影响。结果表明,当外沟溶解氧浓度为0.3 mg/L时,约有29.97 mg/L的总氮在氧化沟的外沟通过SND去除,外沟对COD的实际去除量为9.03 mg/L,外沟的SND主要是利用微生物内贮有机碳源或生物吸附碳源进行的。控制氧化沟的外、中、内沟溶解氧浓度分别为0.3、0.5和2.0 mg/L时,系统的SND率和总氮去除率最高。在优化的溶解氧条件下,系统对总氮的平均去除率和平均SND率分别为66.0%和42.6%,分别比优化前提高了13.8%和24.3%。
The effects of dissolved oxygen （DO） concentration on simultaneous nitrification and denitrification （SND） were investigated using domestic wastewater with low C/N ratio in a modified pilotscale Orbal oxidation ditch. The mass balance results of the systems show that about TN of 29.97 mg/L and COD of 9.03 mg/L are removed in outer channel where DO concentration is 0.3 mg/L. This indicates that stored substrate and/or COD adsorbed by cells is provided as the main electron donor to SND. In order to reach the highest nitrogen removal efficiency and SND rate, the DO concentration in outer channel, middle channel and inner channel of the oxidation ditch shall be controlled at 0.3 rag/L, 0.5 mg/L and 2.0 mg/L respectively. Approximate TN removal efficiency of 66.0% and SND percentage of 42.6% are achieved under optimized DO concentrations, increased by 13.8% and 24.3% than before DO optimization.
出处
《中国给水排水》
CAS
CSCD
北大核心
2007年第3期44-48,共5页
China Water & Wastewater
基金
北京市自然科学基金资助项目(8062006)
北京市创新团队资助项目
关键词
同步硝化反硝化
C/N
溶解氧
氧化沟
simultaneous nitrification and denitrification （SND）
C/N
dissolved oxygen
oxidation ditch
