BDD电极阳极氧化垃圾渗滤液纳滤浓缩液

实验研究了电化学技术阳极氧化垃圾渗滤液纳滤浓缩液,比较了不同阳极种类、电流密度和极板间距对污染物降解的影响.结果表明,掺硼金刚石(boron-doped diamond,BDD)薄膜电极作为阳极,比钛基镀钌铱(Ti-RuO2-IrO2)和钛基镀铂(Ti-Pt)电极作为阳极时,有机物的矿化更为迅速.选用BDD电极作为阳极,不锈钢电极作为阴极,随着电流密度的增加(10~100 mA/cm2),TOC去除率随之提高,极板间距的改变(2~12 mm)对TOC的降解影响较小.BDD阳极氧化6 h后,浓缩液的TOC去除率达到94%.研究表明,BDD电极阳极氧化技术可有效地处理垃圾渗滤液纳滤浓缩液,可将其应用于高毒性难生物降解的有机废水的处理工艺中.

Anodic oxidation of landfill leachate nanofiltration concentrates using BDD electrode

This study investigated the electrochemical oxidation of landfill leachate concentrates generated from nanofiltration of biologically pretreated leachate. The effects of anode type, current density, and electrode distance on pollutant degradation were evaluated. The results show that the pollutants in the leachate were mineralized much more rapidly when boron-doped diamond(BDD) electrode was used as the anode than when Ti-RuO2-IrO2 and Ti-Pt electrode was used. Increasing the current density(10~100 mA/cm2) increased the total organic carbon(TOC) removal rate during electrochemical oxidation, whereas the electrode distance(2~12 mm) had little influence on the TOC removal rate. Almost complete TOC mineralization(94% removal) can be achieved after 6 h of electrochemical oxidation using the BDD anode. The results of this study indicate that electrochemical oxidation with BDD anode is an effective process for the treatment of landfill leachate concentrates, and can be applied to treat wastewaters containing toxic and biorefractory organic pollutants.