聚铁混凝法深度处理老龄垃圾渗滤液的工程应用运行分析

摘要

Coagulation using polymeric ferric sulfate（PFS） as coagulants was successfully applied to the advanced treatment of mature landfill leachate,and up to 65 % of COD removal efficiency was achieved for the biologically pretreated leachate.The effects of reaction pH,influent pH and influent COD on the COD removal efficiency was investigated based on the summary of approximately 400 d operations.The results showed that the appropriate pH range for PFS coagulation is relative broad,influent pH（≤8.5） and influent COD（≤850 mg/L） had little effect on COD removal efficiency.However,COD removal efficiency would decrease sharply when reaction pH exceeding 6.0,indicating that the reaction pH should be controlled at 3.3~5.6.%将聚铁混凝工艺成功应用于老龄垃圾渗滤液的深度处理,对渗滤液生化处理出水的COD去除率可达65%以上,总结了近400 d的运行情况,分析了反应pH、进水pH和进水COD对COD去除率的影响。结果表明,进水pH（≤8.5）和进水COD（≤850 mg/L）对COD去除率的影响不大,聚铁混凝的最适反应pH范围较宽,在3.3~5.6之间,但反应pH大于6.0时COD去除率会急剧降低。