铁离子循环电解法处理垃圾填埋场晚期渗滤液

Treatment of late-period landfill leachate by electrolysis with iron recycling

使用箱式电化学反应器,采用铁离子循环电解工艺处理垃圾填埋场晚期渗滤液,确定了硫酸铁的剂量,考察了该工艺去除污染物的效率与主要因子对污染物去除的影响.实验结果表明,铁离子循环电解工艺对垃圾填埋场晚期渗滤液具有良好的处理效果,在电压3.80V、pH值为3.0、电解时间40min条件下,电解后的渗滤液满足二级排放标准的要求;硫酸铁的合理浓度为1000mg.L-1;电解电压不宜超过4.0V,电解时间不宜超过40min;渗滤液中氯离子的浓度对COD和NH4+-N的去除有显著影响,浓度越高COD和NH4+-N去除效果越好,且其对NH4+-N去除的影响大于对COD去除的影响.

Late-perlod landfill leachate was treated by electrolysis with iron recycling in a box-style electrochemical reactor. The optimal dosage of Fe2 （SO4） 3 was determined and the contaminant removal efficiency was investigated under different conditions. The results showed that electrolysis with iron recycling is an effective treatment method. Under a voltage of 3.80V at pH 3.0, after 40 min of treatment, /he water quality could meet/he second discharge standard. The optimal dosage of Fe2 （ SO4 ）3 was 1000 mg·L^-1 , and the voltage and the electrolysis time were not more than 4.0 V and 40 min. The concentration of C1^- had a notable effect on COD and NH4^＋ - N removal, and higher C1^- concentration was advantageous to COD and, especially, NH4^＋ - N removal.