宁波地区农村生活污水产污特征分析研究

Pollution characterization study of rural domestic sewage in Ningbo area

以世界银行贷款宁波新农村发展项目农村生活污水治理子项目为基础,开展宁波地区农村生活用水量、生活污水产生时间和污染物浓度调查与分析。结果表明:按常住人口计算的人均用水量明显大于按户籍人口计算的人均用水量,特别是山区地区由于外出人口较多,按两种口径计算差异较大。农村生活污水为非连续排放,生活用水量在6:00—9:00、11:00—13:00和17:00—21:00出现3个高峰,22:00至次日6:00期间生活用水量基本无排放。平原村庄污水处理设施进水污染物平均浓度高于山区村庄,其中平原村庄农村生活污水处理设施进水的COD、BOD5、SS、TN平均质量浓度分别为172.4、57.0、55.8、36.4mg/L,山区村庄农村生活污水处理设施进水的COD、BOD5、SS、TN平均质量浓度分别为141.6、52.8、43.8、24.9mg/L。

Based on the Word Bank load project of rural domestic sewage of Ningbo,research and analysis of rural water consumption,rural domestic sewage production time and pollutant concentrations in Ningbo area were carried out. The results showed that the per capita water consumption by the resident population was significantly greater than the per capita water consumption by household population, especially in the mountainous area because of the lar- ger amount of outgoing population. Rural domestic sewage as a uncontinuous discharge had three peaks in 6：00-9..00, 11：00-13：00 and 17 ： 00-21 ： 00, and basically no emissions in 22 ： 00-6 ： 00 （next day）. The average influent pollutant concentrations of sewage treatment facilities in plain villages were higher than those in mountain villages. The average concentrations of COD,BODs ,SS,TN of influent of sewage treatment facilities were 172.4,57.0,55.8,36.4 mg/L in plain villages, and 141.6,52.8,43.8,24.9 mg/L in mountain villages, respectively.