Monitoring and Analysis of Sewage Discharge Characteristics of Typical Land Use Types in a City in South China
To analyze and diagnose the reasons for the low influent concentration of municipal wastewater treatment plants in southern China,the sewage discharge characteristics of 306 plots belonged to 5 typical land use types in a built-up district of a city in South China were investigated and measured.In the study area,the average daily BOD5 in plots with combined system,incomplete separate system and complete separate system were 95.10 mg/L,118.51 mg/L and 145.24 mg/L respectively.In the five typical plots,the average daily concentration of pollutants in the effluent from residential communities and public institutions was relatively low.Specifically,the average daily COD was 255.58 mg/L and 219.94 mg/L respectively,and the average daily BOD5 in the effluent from public institutions was less than 100 mg/L.The effluent quality of various types of plots varied significantly.With the exception of industrial plots,the BOD5/TN ratio of other plots was generally concentrated within the range of 2.29 to 3.56,which was lower than the biological nitrogen removal requirement(BOD5/TN≥4).Compared to other regions in China,the relatively high per capita water consumption in South China might be the cause for the relatively low concentration of effluent quality in the plots.One of the key factors for improving quality and efficiency of the drainage system lies in improving the separation degree of clean water and sewage in drainage pipes within the plots.
improving quality and efficiencydrainage systemland use typeseparation of clean water and sewagemisconnection of rainwater and sewage
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万方数据
