重庆市城镇居民生活区污水水质特征分析

Analysis of Wastewater Quality of Residential Areas in Chongqing

随着城市化建设加快,城市人口增加。重庆市城区居民生活区所排污水已成为生活污水主要来源之一。对重庆市13家居民生活区污水进行监测的基础上,分析了污水的污染当量负荷比、污染物随时间变化规律,结果表明,重庆市城镇居民生活区污水未经处理,水质较差,化学需氧量达672.11 mg/L。污水经处理后,各项指标均有所削减,其中动植物油削减效果最好,削减率达77%。居民生活区主要污染因子为COD、BOD5。污染物浓度冬季最高,夏季最低,春秋两季浓度波动不大。早、中、晚污染物浓度变化不大,小范围内略有波动。

With fast development of urban construction and quick increase of urban population in Chongqing, wastewater discharged from residential areas is becoming one of main sources of domestic wastewater. Load ration of pollution equivalent and concentration variation changing with time were analyzed based on monitoring of 13 residential areas. Results showed that wastewater quality was poor before treatment, with COD concentration up to 672.11 mg/L, while after treatment the concentration has decreased, with reduction rate of animal and vegetable oils up to 77%. Main pollution factors of residential areas are COD, BOD5, and the concentration is highest in summer, lowest in winter and has small fluctuation in spring and autumn. The concentrations show a little change among morning, noon and evening.