腐蚀电池-Fenton工艺用于垃圾渗滤液的预处理研究

Pretreatment of landfill leachate with corrosive cell-Fenton process

采用铁屑和颗粒活性炭通过原电池反应产生的Fe2+离子取代FeSO4组成腐蚀电池Fenton工艺,采用该工艺对垃圾渗滤液进行预处理.结果表明,最佳运行条件为pH值为2、H2O2投加量为理论投加量的50%、铁屑投量为30g(500mL渗滤液中)、Fe/C质量比为2.5、反应时间为1h、絮凝pH值为7,其COD去除率可达到60%(其中活性炭吸附占19%),TOC去除率可达47%(其中活性碳吸附占13%),BOD5/COD值从原水的0.35提高到出水的0.69;而传统Fenton工艺在H2O2/Fe2+比值等于5、其它条件与腐蚀电池Fenton工艺相同的条件下,COD去除率为26%,TOC去除率为19%,BOD5/COD比值从原水的0.43提高到0.69.将腐蚀电池Fenton工艺用于垃圾渗滤液的预处理,在有机物去除率和提高可生化性方面效果均明显优于传统Fenton工艺.

Instead of using FeSO4 for the traditional Fcnton process, new state of Fe^2＋ ions generated by corrosive cell process between iron scraps and granular activated carbon （GAC） were utilized to pretreat landfill leaehate. The results indicated that, under the optimal conditions that pH was 2, the quantity of H2O2 was 50% of theoretical dose, iron scrap was 3 g （in 500 mL leachate）, the mass ratio of Fe/C was 2.5, the reaction time was 1 h, and the pH of flocculation was 7, COD and TOC removals were 60% （ 19% due to GAC adsorption） and 47% （ 13% due to GAC adsorption）, respectively. BOD5/COD ratio was increased from 0. 35 （raw leachate） to 0.69 （ treated water）. While under the H2 02/Fe^2＋ mass ratio of 5 and other similar conditions, COD and TOC removals were 26% and 19% respectively, BOD5/COD ratio was increased from 0.43 （raw leachate） to 0.69 （treated water） for the traditional Fenton process. Obviously, corrosive cell-Fcnton process has better performance than the traditional Fcnton process for prctrcating landfill leachatc in organic removal and biodegradability increase.