城镇污水治理工程中污水处理厂的初步设计-设计说明书

摘要本设计是某城镇污水治理工程中污水处理厂的初步设计。设计处理废水为典型的城镇综合污水，规模为 1.84 万吨/天，处理水质为：BOD5 = 150 mg/L、COD = 300 mg/L、SS = 180 mg/L、NH4-N = 20 mg/L、TP = 2.5 mg/L，设计出水水质：BOD5 ≤ 20 mg/L、COD ≤ 60 mg/L、SS ≤ 30 mg/L、NH3-N ≤ 8 mg/L、TP = 1.0 mg/L。要求废水处理后达到《城镇污水处理厂污染物排放标准（GB 18918－2025）》的一级 B 排放标准。设计采纳二段生物接触氧化法工艺，工艺主体构筑物主要包括沉砂池、初沉池、生物处理池和消毒池。生物处理池采纳的是二段接触氧化工艺，该方法不仅结构紧凑，管理操作也很方便。消毒池采纳加氯消毒。本工艺具有出水水质良好、生物脱氮效果佳、污泥量少且稳定、以及运行管理方便等特点。关键词：城镇污水处理；接触氧化工艺；脱氮除磷Abstract This project is a primary design of sewage treatment plant in a town. The treated wastewater is a typical integrated sewage in a town. The design capacity of the sewage is 18 400 m3/d. The primary water quality is presented as following: BOD5 = 150 mg/L, COD = 300 mg/L, SS = 180mg/L, NH -N = 20 mg/L, TP = 2.5 mg/L; and the effluent need reach the State criterion, Discharge standard of pollutants for municipal wastewater treatment plant (GB 18918－2025), which is BOD5 ≤ 20mg/L, COD ≤ 60mg/L, SS ≤ 30 mg/L, NH4-N ≤ 8mg/L, TP ≤ 1 mg/L. The two-stage contact oxidation method was adopted in the design process that main structure consists of grit chamber, primary clarifier, contact bio-oxidation unit and disinfection unit. The two-stage biological contact oxidation process in the biochemistry treatment unit is characterized as compact structure and convenient operation. Chlorine was used for disinfection of the effluent. The process has a lot of features, such as good water-quality of the effluent, efficient bio-denitrification, producing of small amount of steady sludge,...