Kaur Kamalpreet, Mor Suman, Ravindra Khaiwal
Department of Environment Studies, Panjab University (PU), Chandigarh 160014, India.
Department of Environment Studies, Panjab University (PU), Chandigarh 160014, India; Centre for Public Health, Panjab University (PU), Chandigarh 160025, India.
J Colloid Interface Sci. 2016 May 1;469:338-343. doi: 10.1016/j.jcis.2016.02.025. Epub 2016 Feb 6.
The application of cow dung ash was assessed for the removal of organic contamination from the wastewater using landfill leachate of known Chemical Oxygen Demand (COD) concentration in batch mode. The effect of various parameters like adsorbents dose, time, pH and temperature was investigated. Results indicate that upto 79% removal of COD could be achieved using activated cow dung ash (ACA) at optimum temperature of 30 °C at pH 6.0 using 20 g/L dose in 120 min, whereas cow dung ash (CA) shows 66% removal at pH 8.0 using 20 g/L dose, also in 120 min. Data also shows that ACA exhibited 11-13% better removal efficiency than CA. COD removal efficiency of various adsorbents was also compared and it was found that ACA offers significantly higher efficiency. Freundlich and Langmuir adsorption isotherms were also applied, which depicts good correlations (0.921 and 0.976) with the experimental data. Scanning electron microscope (SEM) images shows that after the activation, carbon particles disintegrate and surface of particles become more rough and porous, indicating the reason for high adsorption efficiency of ACA. Hence, ACA offers a cost-effective solution for the removal of organic contaminants from the wastewater and for the direct treatment of landfill leachate.
采用间歇式模式，以已知化学需氧量（COD）浓度的垃圾渗滤液为对象，评估了牛粪灰对废水中有机污染物的去除效果。研究了吸附剂用量、时间、pH值和温度等各种参数的影响。结果表明，在30℃的最佳温度、pH值为6.0、吸附剂用量为20 g/L的条件下，活化牛粪灰（ACA）在120分钟内可实现高达79%的COD去除率；而牛粪灰（CA）在pH值为8.0、吸附剂用量为20 g/L的条件下，同样在120分钟内的去除率为66%。数据还表明，ACA的去除效率比CA高11-13%。还比较了各种吸附剂的COD去除效率，发现ACA的效率显著更高。同时应用了弗伦德里希和朗缪尔吸附等温线，其与实验数据呈现出良好的相关性（分别为0.921和0.976）。扫描电子显微镜（SEM）图像显示，活化后碳颗粒解体，颗粒表面变得更加粗糙和多孔，这表明了ACA具有高吸附效率的原因。因此，ACA为去除废水中的有机污染物以及直接处理垃圾渗滤液提供了一种经济高效的解决方案。
