Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India; CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India; Department of Environmental Science & Technology, Shroff S.R. Rotary Institute of Chemical Technology, UPL University of Sustainable Technology, Ankleshwar (Gujarat), 393 135, India.
CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India.
Chemosphere. 2022 Mar;290:133255. doi: 10.1016/j.chemosphere.2021.133255. Epub 2021 Dec 16.
Leachate treatment is an essential and integral part of solid waste management system, and its efficient treatment becomes more crucial when the leachate is produced from industrial or hazardous waste landfills (HWLs), as it is multi-fold more toxic than the leachate produced from municipal solid waste landfills (MSWLs). Electrocoagulation has appeared to be a promising technology for treating complex wastewater including MSWL leachate, but specific treatability studies dedicated to HWL leachate are rarely available, and thus pose a demand for fundamental and advance research in this area to bridge the existing gap. The current study delves into systematic design of experiments to check the treatability of HWL leachate through electrocoagulation, considering reduction (maximum) in chemical oxygen demand (COD) as a response variable. Response Surface Methodology (RSM) was used for design of experiments and process optimization and three-dimensional surface response was also created to understand the relationship among process parameters and response variables. After extensive experimental trials and data analysis, it was observed that electrocoagulation can be used as a potential treatment technology for leachate with Galvanized Iron (GI) as preferable electrode material and it resulted up to 90% reduction in COD under optimized condition. Significant reduction in other parameters was also observed with a removal efficiency of 58.1%, 63.6%, 42.4%, 52.5%, 54.7% and 84% for cadmium, zinc, phenolic compounds, lead, TOC, and colour, respectively. The results showed that Electrocoagulation can be used as a replacement of currently practised energy extensive treatment technologies like multiple effect evaporators, which are used by landfill operators for managing their HWL leachate. The methodology and results from this research may be utilized by the researchers and operators of HWL landfills to decide the treatment trail for HWL leachate.
渗滤液处理是固体废物管理系统的重要组成部分，当渗滤液来自工业或危险废物填埋场（HWL）时，其高效处理变得更加关键，因为它比来自城市固体废物填埋场（MSWL）的渗滤液毒性大得多。电凝聚似乎是处理包括 MSWL 渗滤液在内的复杂废水的一种很有前途的技术，但专门针对 HWL 渗滤液的具体可处理性研究很少，因此需要在该领域进行基础和先进的研究，以弥补现有差距。本研究通过电凝聚深入研究了 HWL 渗滤液的可处理性，以化学需氧量（COD）的最大减少为响应变量。响应面法（RSM）用于实验设计和过程优化，并创建了三维曲面响应，以了解工艺参数和响应变量之间的关系。经过广泛的实验试验和数据分析，观察到电凝聚可以作为一种潜在的渗滤液处理技术，使用镀锌铁（GI）作为优选的电极材料，在优化条件下可以将 COD 降低 90%。其他参数也有显著降低，镉、锌、酚类化合物、铅、TOC 和颜色的去除效率分别为 58.1%、63.6%、42.4%、52.5%、54.7%和 84%。结果表明，电凝聚可以替代目前广泛应用于管理 HWL 渗滤液的多效蒸发器等能源密集型处理技术。HWL 填埋场的研究人员和操作人员可以利用这项研究的方法和结果来决定 HWL 渗滤液的处理方案。
