对传统活性污泥法污水厂新增脱氮除磷的改造

发布时间：2018-06-01 08:08

本文选题：传统活性污泥法 + 改造　；参考：《中国给水排水》2017年15期

【摘要】：某一传统活性污泥法污水处理厂没有脱氮除磷功能,处理规模为1.8×104m3/d。第一阶段已成功对原工艺的初沉池和曝气池第一廊道进行了改造,改造完后运行的第一阶段(第1~30天)出水COD、氨氮、TN浓度均达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准,出水SS和TP平均浓度分别为12和0.8 mg/L,达到一级B标准。为了使出水SS、TP浓度也达到一级A标准,第二阶段在第一阶段的基础上在尾端模拟增加砂滤管并在管前端添加PAC,以进一步完成对工艺的改造研究。结果表明,第二阶段(第31~121天),出水SS为1~6 mg/L,平均为4 mg/L,平均去除率为97.5%;出水TP为0~0.46 mg/L,平均为0.22 mg/L,平均去除率为89.5%。出水COD、氨氮、TN、SS、TP均达到一级A标准。工艺改造成功实现了脱氮除磷目标,而且没有混合液回流(内回流),因此整个工程运行节能,为现有无脱氮除磷功能污水处理厂提标改造提供了思路。
[Abstract]:A traditional activated sludge wastewater treatment plant has no nitrogen and phosphorus removal function, and the scale of treatment is 1.8 脳 10 ~ 4 m ~ 3 / d. In the first stage, the primary settling tank and the first corridor of the aeration tank have been successfully reformed. In the first stage (30 days), the concentration of ammonia nitrogen and nitrogen TN in effluent reached the first class A standard (GB 18918-2002). The average concentrations of SS and TP in effluent were 12 and 0.8 mg / L, respectively, up to the first class B standard. In order to make the concentration of SSN TP reach the first A standard, in the second stage, the sand filter tube was added at the end of the first stage and PAC was added to the front of the pipe, so as to complete the research on the process modification. The results showed that in the second stage, SS was 1g / L, the average removal rate was 97.5 mg / L, the effluent TP was 0.46 mg / L, the average was 0.22 mg / L, and the average removal rate was 89.5g / L. The effluent COD, NH3-N and TNSSN TP are up to the first class A standard. The process has successfully realized the goal of denitrification and phosphorus removal, and there is no reflux (internal reflux) of the mixed liquid, so the whole project runs energy saving, which provides the idea for upgrading the standard of the existing wastewater treatment plant without denitrification and phosphorus removal.
【作者单位】：湖南省环境监测中心站;
【分类号】：X703

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