铁促电解深度处理填埋场渗滤液的研究

采用箱式电化学反应器（具有氧化物涂层的钛基阳极）进行填埋场渗滤液的深度处理,考察了FeSO₄浓度、初始pH值、电压（电流）对污染物去除的影响,对比了铁促电解过程使用Fe²⁺和Fe³⁺的污染物去除效果.结果表明,与传统有机物电化学氧化相比,铁促电解显著提高了有机物的去除效率.FeSO₄浓度增大,有机物去除效果提高,当FeSO₄浓度大于1　250　mg·L^-1,有机物去除率提高幅度减小;污染物去除速率在30　min内较快,然后逐渐递减;合理的初始pH值范围为3～4;若有效去除COD和NH⁺₄-N,则电解电压须大于3.3 V,电流大于4.8 A;Fe³⁺促进电解去除有机物的效果略低于Fe²⁺;提出了铁盐循环利用和将酸洗废水应用于铁促电解过程的设想.

Electrolysis of Iron Promoting for the Advanced Treatment of Landfill Leachate

The advanced treatment of landfill leachate by electrochemical oxidation was carried out in a box-style electrochemical reactor, using oxide-coated titanium anode. The effects of the concentration of FeSO4, reaction time, the initial pH value, and voltage (current) on the removal of contaminants were investigated. The removal efficiency of contaminant was compared when Fe2+ and Fe3+ used. The results show, compared with the traditional oxidation of electrolysis, the electrolysis of iron promoting can enhance the organism removal efficiency prominently. The increase of the concentration of FeSO4 can result in the increasing organism removal, but when it exceeds 1 250 mg x L(-1), the increasing range decreases. The removal progress of contaminants is very fast in the first 30 minutes, and then slows down. The reasonable initial pH value is 3 - 4. To eliminate COD and NH4(+) -N from leachate effectively, voltage and current must be larger than 3.3 V and 4.8 A respectively. Compared with Fe2+, the organism removal efficiency is slightly lower when Fe3+ used. Two tentative ideas, making recycle use of iron and the application of acid waste water in the process, were proposed.