零价铁法处理垃圾填埋场渗滤液

为解决垃圾渗滤液尤其是回灌后渗滤液存在可生化性差的问题,研究了一种可行的渗滤液物化处理工艺。采用零价铁法工艺,利用废旧铁屑处理渗滤液。实验考察找到了处理效果随铁屑投加量,焦炭投加量、反应时间及pH值变化的规律,并通过正交实验找到了最佳的反应条件组合。实验结果表明:当pH控制在7.4左右,反应时间3 h,铁屑和焦炭投加量分别在175 g.L-1和0.3 g.L-1的时候,能达到60%的化学需氧量去除率。结果表明,零价铁法处理渗滤液效果明显,价格适中,操作简单,应用前景广阔。

Zero-valence iron process treatment of landfill leachate

A zero-valence iron physicochemical treatment technology using scrap iron chips was developed to treat bioreactor landfill leachate.Tests show that the pH,reaction time,and the quantity of iron chips and coke can influence the chemical oxygen demand removal efficiency.The pH value should be about 7.4,with 175 g/L of iron chips and 0.3 g/L of coke.With these conditions,the chemical oxygen demand removal efficiency reached 60% after a 3 h reaction.Therefore, the zero-valence iron process is a competitive method for treating landfill leachate due to its easy of use,efficiency,and low cost.