BBR工艺用于污水处理厂准Ⅳ类水提标改造

Research and Demonstration of BBR Process for Upgrading and Renovation of Quasi-Ⅳ Standard in Sewage Treatment Plant

南昌某污水处理厂升级改造后,污染物排放标准由原《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级B标准提高至《地表水环境质量标准》(GB 3838—2002)的准Ⅳ类标准,且TN和SS达到一级A标准。该污水厂将A/A/O微曝氧化沟二级生化处理工艺升级改造为以“植物-泥-膜”为核心的植物生态生物膜(BBR)工艺,持续约7个月(含冬季)的正常运行数据显示,改造后出水水质满足设计标准,运行稳定,且抗冲击负荷(水质、水量、温度)能力强,NH_(3)-N、COD、BOD_(5)、TP的日平均浓度分别可达0.38、11.46、4.49、0.09 mg/L,优于地表Ⅳ类水标准;出水TN和SS分别为6.16 mg/L和2.38 mg/L,稳定处于10 mg/L以下;处理费用为0.6元/m^(3),较改造前节省约20%。

After the transformation and upgrading of the sewage treatment facilities of a sewage treatment plant in Nanchang, the pollutant discharge was raised from the first level B standard in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002) to the quasi-Ⅳ standard of the Environmental Quality Standards for Surface Water(GB 3838-2002), and the TN and SS reached the first level A standard of GB 18918-2002. In this project, the secondary biochemical treatment process of A/A/O micro-aeration oxidation ditch of sewage treatment plant is upgraded and transformed into BBR process with “plant-sludge-membrane” as the core, after about 7 months(including winter) normal operation data showed that, its effluent quality meet the design standards, stable operation,and strong impact load capacity(water quality, water quantity, temperature). The daily average concentrations of NH_(3)-N, COD, BOD_(5), and TP reached 0.38 mg/L, 11.46 mg/L, 4.49 mg/L, and 0.09 mg/L,respectively, better than the surface water class Ⅳ standard. And the effluent concentrations of TN and SS were 6.16 mg/L and 2.38 mg/L, respectively, which were stable below 10 mg/L. At the same time, the treatment cost was 0.6 yuan/m^(3), which saves about 20% of the cost compared with the previous.