ZHAOSi-suo,LIGang,LIYi-ping,et al.Monitoring and Analysis of Sewage Discharge Characteristics of Typical Land Use Types in a City in South China[J].China Water & Wastewater,2025,41(1):115-122.
华南某市典型用地类型污水排放特征监测与分析
- Title:
- Monitoring and Analysis of Sewage Discharge Characteristics of Typical Land Use Types in a City in South China
- Keywords:
- improving quality and efficiency; drainage system; land use type; separation of clean water and sewage; misconnection of rainwater and sewage
- 摘要:
- 为深入剖析与诊断我国南方城市污水处理厂进水浓度较低的原因，以华南某市建成区为例，选取5种典型用地类型共306个地块开展调查和实测，对其污水排放特征进行了研究。结果表明，研究区域内合流、清污分流不彻底和较彻底的地块排水BOD5日平均浓度均值分别为95.10、118.51、145.24 mg/L；5类典型地块中，居民小区和公共机构地块的排水污染物日平均浓度相对较低，其中COD日平均浓度均值分别为255.58、219.94 mg/L，公共机构地块排水BOD5日平均浓度均值不足100 mg/L；不同类型地块排水水质差异较明显，除工业地块外，其他地块排水的BOD5/TN值普遍集中在2.29~3.56，低于可生物脱氮指标（BOD5/TN≥4）；与国内其他地区相比，华南地区人均用水量偏高可能是导致地块排水水质浓度相对偏低的原因。提升地块排水管道清污分离程度是排水系统提质增效的关键因素之一。
- Abstract:
- 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.
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