混凝沉淀+微曝气滤池净化河道水体工艺研究

Study on the Process of River Body Purification by the Coagulation Sedimentation + Biological Aerated Processing

针对城市河道水体因截污不彻底、径流污染、大气干湿沉降等因素,水体质量普遍较差并出现黑臭化的现象,采用混凝沉淀与微曝气滤池相结合的工艺对广州某市河道进行了125天的净化处理研究,监测了主要指标TP、NH3-N和COD的变化趋势,研究结果表明,TP、NH3-N和COD去除率分别达到87%、85%和87%,出水TP、NH3-N和COD质量浓度分别稳定在0.3 mg/L、1.8 mg/L和16 mg/L左右,达到地表水V类标准,可为受污染的城市河道水体水质的维护和保育提供技术依据与应用参考,为城市河道水体水质的生态维护提供借鉴。

Several pollution sources, such as undesirable intercepting sewer, pollution of runoff and atmospheric dry and wet deposition etc, result in the poor quality of urban river with black and odor. Coagulation sedimentation + micro-aerated biological filter process was adapted to treat the river body for 125 d in Guangzhou city, TP, NH3-N, COD were monitored. Results showed that the mass concentration of TP, NH3-N, COD of effluent decreased to0.3 mg/L, 1.8 mg/L and 16 mg/L, the removing rate reached 87%, 85% and 87% respectively, which reached the class V of Surface Water Quality Standards. This work provide technical basis and application option for the maintenance and conservation of water quality in polluted urban rivers.