Fenton污泥制备聚合硫酸铁的中试试验研究

Pilot Study on the Preparation of PFS from Fenton Treatment Sludge

以广州造纸集团有限公司经Fenton法处理废水后的污泥为原料,采用酸浸还原回收Fenton污泥中的Fe,进一步制备高效絮凝剂聚合硫酸铁(PFS)。研究表明,Fenton污泥自然沉降至固含量8%~9%时,先用硫酸中和反应2h,再加铁屑还原反应2h,可制备质量分数为25.0%~26.7%的硫酸亚铁(FeSO4)溶液;该溶液经氯酸钠氧化,成功制备出盐基度为10.8%的聚合硫酸铁(PFS)。并初步评价了所制备的PFS对广州造纸集团有限公司废水处理系统厌氧出水的絮凝效果。结果表明,当PFS用量为5mL/L时,出水CODCr可降至260mg/L,CODCr去除率达71.0%。

The iron of Fenton sludge from Guangzhou Paper mill wastewater treatment system was recovered by using acid leaching, and high efficient flocculant polymeric ferric sulfate(PFS) was further prepared in pilot scale test. The optimized conditions were found to be 2 h for first reaction with sulfuric acid neutralization and followed by 2 h iron reduction reaction, the solid concentrations of 25.0% to 26.7% ferrous sulfate solution was prepared. For subsequent preparation of polymeric ferric sulfate(PFS) preparation, the ferrous sulfate solution was catalytic oxidized by sodium chlorate, the basicity of resulting PFS was 10.8%. The flocculation effect of the prepared PFS on the anaerobic effluent of Guangzhou Paper mill was preliminarily evaluated. The research showed that the effluent COD Cr could be reduced to 260 mg/L , the corresponding COD Cr removal rate reached 71.0% when the addition amount of the prepared aqueous solution of PFS was 5 mL/L.