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Stabilized landfill leachate treatment by zero valent aluminium-acid system combined with hydrogen peroxide and persulfate based advanced oxidation process
Waste Management ( IF 8.1 ) Pub Date : 2020-03-13 , DOI: 10.1016/j.wasman.2020.03.005
Jismy Antony , S.V. Niveditha , R. Gandhimathi , S.T. Ramesh , P.V. Nidheesh

The toxic leachate generated from landfills is becoming a major nuisance to the environment and has vital role in groundwater contamination. This study evaluated the potential of zero valent aluminium (ZVAl) based advanced oxidation processes (AOPs) for stabilized landfill leachate treatment. Hydrogen peroxide (HP) and persulfate (PS) were used to generate additional radicals in aerated ZVAl acid process. ZVAl-acid system achieved 83% COD removal efficiency under optimized conditions such as acid washing time of 20 min, ZVAl dose of 10 g L−1 at initial pH 1.5. The highest exclusion efficiencies in terms of TOC, COD as well as color were 83.52%, 96% and 63.71% respectively in treatment systems showing the following order: ZVAl/H+/Air/HP/PS > ZVAl/H+/Air/PS > ZVAl/H+/Air/HP > ZVAl/H+/Air > ZVAl/H+. The involvement of other metals such as Fe and Cu in the process has been found. The reusability study revealed that ZVAl powder can be effectively used up to three cycles. The 28.48 mg/l of Al3+ residue was observed in this process which has to be removed before discharge of effluent. The study indicated that the ZVAl based AOPs is stable and active for the degradation of organic pollutants present in landfill leachate and a promising solution except for the aluminium discharge which has to be given special care.



中文翻译:

零价铝酸体系结合过氧化氢和过硫酸盐的先进氧化工艺稳定处理垃圾渗滤液

垃圾填埋场产生的有毒渗滤液正在成为对环境的主要危害,并在地下水污染中起着至关重要的作用。这项研究评估了基于零价铝(ZVAl)的先进氧化工艺(AOP)用于稳定垃圾填埋场渗滤液处理的潜力。过氧化氢(HP)和过硫酸盐(PS)在充气ZVAl酸过程中用于生成其他自由基。ZVAl-酸系统在优化的条件下(例如20分钟的酸洗时间,初始pH 1.5下的ZVA1剂量为10 g L -1)达到了83%的COD去除率。在TOC方面的最高效率排斥,COD以及颜色分别为83.52%,96%和在示出按下列顺序处理系统分别63.71%:ZVAL / H + /空气/ HP / PS> ZVAL / H +/空气/ PS> ZVAl / H + /空气/ HP> ZVAl / H + /空气> ZVAl / H +。已发现该过程中还涉及其他金属,例如铁和铜。可重复使用性研究表明ZVAl粉末最多可有效使用三个循环。在此过程中观察到28.48 mg / l的Al 3+残留物,必须在排放废水之前将其除去。研究表明,基于ZVAl的AOP对垃圾渗滤液中存在的有机污染物的降解是稳定且有活性的,除了需要特别注意的铝排放外,它是一种很有前途的解决方案。

更新日期:2020-03-16
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