重污染黑臭坑塘系统化治理工程与效果

Systematic treatment project and effect of heavily polluted black and odorous ponds and pits

以位于河北省保定地区的某重污染黑臭坑塘为治理对象,该坑塘存水主要来自工业污染源,水中COD Cr、BOD 5、氨氮、总氮和氯化物浓度平均值分别为1700、594、225、331、5550 mg/L。为整治该坑塘,恢复其水体环境,将坑塘污水抽取后采用两级A/O+MBR+Fenton氧化法工艺的一体化设备处理,处理后出水达到《地表水环境质量标准》(GB 3838—2002)中Ⅴ类标准。底泥采用异位固化、稳定化技术+土壤阻隔填埋技术治理后,坑塘底泥污染物符合《土壤环境质量建设用地土壤风险管控标准(试行)》(GB 36600—2018)中第二类用地管制值标准。坑塘治理完成后,建立水体维护系统,帮助其重建生态系统,强化水体自净能力。项目采用的重污染坑塘污水和底泥治理技术具有高效和运行稳定的特点。

Taking a heavily polluted black and odorous pits and ponds located in Baoding,Hebei Province as the treatment object,the pit and pond received water are mainly from industrial pollution sources,the average concentrations of COD Cr,BOD 5,ammonia nitrogen,total nitrogen,and chloride in the water are 1700,594,225,331,and 5550 mg/L,respectively.In order to renovate the pit and pond and restore its water body environment,the sewage from the pit and pond was extracted and treated using an integrated equipment of two-stage A/O+MBR+Fenton oxidation process.The sewage after treatment met the ClassⅤstandard in the Environmental Quality Standards for Surface Water(GB 3898—2002).After the use of ectopic solidification/stabilization technology+soil barrier landfill technology for sediment treatment,the pollutants in the pit and pond sediment met the soil risk control values of ClassⅡin the Soil Environmental Quality,Construction Land Risk Control Standards for Soil Contamination(Trial)(GB 36600—2018).After the completion of pit and pond management,a water body maintenance system was established to help rebuild the ecosystem and strengthen the self-purification capacity of the water body.The heavily polluted pit and pond sewage and sediment treatment technology adopted in this project has the characteristics of high efficiency and stable operation.