青岛市团岛排水系统污水水质水量波动特征解析

WASTEWATER QUANTITY AND QUALITY FLUCTUATION CHARACTERISTICS OF DRAINAGE SYSTEM IN TUANDAO, QINGDAO

为探究青岛市团岛片区排水系统中污水流量与污染物变化规律,对该片区3个典型居民区排水管网中的污水流量和水质指标进行了为期1年(2019年10月—2020年10月)的监测,并计算了污染物的产污系数、变异系数和相关性系数。结果表明,每日污染物7:00浓度最高,这是由于夜间流量小使得污染物在管网内沉积,7:00流量增大冲刷管网从而造成污染物的累积;污染物变异系数均<15%,说明浓度较为稳定;COD产污系数为108 g/(人·d),远高于其他城市的产污系数。相关性分析结果表明,污水流量与污染物COD、BOD_(5)和SS的相关性较高,有很强的协同变化趋势,但与NH^(+)_(4)-N、TN和TP无显著的相关性,这可能是因为氨化反应导致夜间氨氮浓度升高,且管网内无好氧、缺氧和厌氧环境的交替,TN和TP难以去除。该研究成果可为青岛市污水处理厂工艺设计和运行管理提供数据支撑。

The sewage flow and water quality indexes in the drainage pipe networks of three typical residential areas in the Tuandao region of Qingdao were monitored and measured for one year(from October 2019 to October 2020) to investigate the variation law of sewage flow and pollutants. The pollution production coefficient, variation coefficient, and correlation coefficient of the pollutants were calculated. The maximum daily pollutant concentration was mainly due to the low flow at night and pollutant deposition beginning at 7:00 am. At 7:00 am, the flow accelerated and scoured the pipe network, collecting high concentration pollutants. Pollutant fluctuation coefficients were observed less than 15%, indicating that the concentration was reasonably steady. The chemical oxygen demand(COD) pollution production coefficient was 108 g/(person·d), which was much higher than in the similar cities. The correlation coefficient between wastewater flow and COD, biochemical oxygen demand(BOD_(5)), and suspended solid(SS) was high and indicated a strong synergistic tendency. However, there was no significant link between NH^(+)-N and total nitrogen(TN). This research provided an appropriate collection of data on the changing laws of wastewater flow and quality in the Qingdao Tuandao drainage system for process design and operation management of municipal wastewater treatment plants.