汛期对大型城市污水处理厂进水特征的影响

Influence of Flood Season on Influent Characteristics of Large-sized Municipal Wastewater Treatment Plant

摘要:

基于长三角地区某大型城市污水处理厂2023年实际运行数据，系统分析了汛期污水厂进水流量和进水水质特征。结果表明，污水厂汛期日进厂流量和最大瞬时流量均超过设计能力。汛期进厂最小瞬时水量主要集中在上午7∶00—9∶00，最大瞬时水量主要集中在下午2∶00—8∶00。汛期期间进水化学需氧量（COD）、总氮（TN）、总磷（TP）和氨氮浓度显著降低，且彼此存在显著相关性。TN与氨氮相关性较高，一元线性拟合程度较好。TP、COD与其他指标线性拟合度相对较弱。通过分析汛期对此污水处理厂进水特征的影响，以期对其他污水处理厂运行管理、优化设计提供借鉴和参考。

Abstract:

Based on the actual operating data of a large-sized municipal wastewater treatment plant (WWTP) in the Yangtze River Delta Region in 2023, the characteristics of influent flow and quality of WWTP in the flood season are systematically analyzed. The results show that the daily influent flow and the maximum instantaneous flow of WWTP in the flood season have both exceeded the design capacities. In the flood season, the minimum instantaneous flow into WWTP occurs mainly from 7 am to 9 am while the maximum instantaneous flow occurs from 2 pm to 8 pm. The concentrations of chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP) and ammonia nitrogen significantly are lowered in the flood season. And there are a significant correlation among them. The correlation between TN and ammonia nitrogen is higher, and the degree of univariate linear fitting is good. The linear fitting degree of TP, COD and the other indexes is relatively weak. The influence of flood season on the influent characteristics of WWTP is analyzed in order to provide the reference for the operation management and optimal design of the other WWTP.