【摘要】 为分析UNITANK工艺生物除磷效果欠佳的原因,以佛山东鄱污水处理厂的UNI-TANK反应器为研究对象,实地考察了UNITANK反应器半周期的氧环境。结果表明:由于UNI-TANK工艺运行具有时序性,其需氧量呈现出周期性的变化;厌氧工序末端呈缺氧状态,其ORP值仅为-19.9 mV,这是由边池在转池(由静置出水到反应进水)过程中泥水全回流所致,而解决该问题的办法为设置独立厌氧段。研究了独立厌氧段对生物除磷的影响,小试结果表明,独立厌氧段适宜的HRT为30~60 m in;为确保该段获得良好的厌氧环境,需降低回流污泥中的NO3--N浓度,但这恰恰是独立厌氧段工程设计的难点。更多还原

【Abstract】 In order to analyze the cause of the low TP removal effect,the half periodic oxygen environment of UNITANK reactor was investigated in Dongpo Wastewater Treatment Plant in Foshan.Moreover,a lab-scale test of enhanced anaerobic environment was carried out.The results show that oxygen demand presents a periodic variety because of the operation schedule of UNITANK.The terminal of anaerobic phase is anoxic(ORP is-19.9 mV) which is caused mainly by infinite reflux of sludge and water.The problem can be solved through setting a special anaerobic basin.The result of lab-scale test shows that the appropriate HRT of the special anaerobic basin shall be 30-60 min.The nitrate concentration in returned sludge shall be reduced to obtain excellent anaerobic environment.However,there will be many difficulties in the engineering design.更多还原