Environmental Chemodynamics Project, National Institute of Fundamental Studies, Kandy, Sri Lanka.
College of Chemical Sciences, Institute of Chemistry Ceylon, Rajagiriya, CO, 10107, Sri Lanka.
J Environ Manage. 2019 May 15;238:323-330. doi: 10.1016/j.jenvman.2019.02.097. Epub 2019 Mar 11.
The remediation of volatile organic compounds (VOCs) from aqueous solution using Municipal solid waste biochar (MSW-BC) has been evaluated. Municipal solid waste was pyrolyzed in an onsite pyrolyzer around 450 C with a holding time of 30 min for the production of biochar (BC). Physiochemical properties of BC were assessed based on X-Ray Fluorescence (XRF) and Fourier transform infra-red (FTIR) analysis. Adsorption capacities for the VOCs (m-xylene and toluene) were examined by batch sorption experiments. Analysis indicated high loading of m-xylene and toluene in landfill leachates from different dump sites. The FTIR analysis corroborates with the Boehm titration data whereas XRF data demonstrated negligible amounts of trace metals in MSW-BC to be a potential sorbent. Adsorption isotherm exhibited properties of both Langmuir and Freundlich which is indicative of a non-ideal monolayer adsorption process taking place. Langmuir adsorption capacities were high as 850 and 550 μg/g for toluene and m-xylene respectively. The conversion of MSW to a value added product provided a feasible means of solid waste management. The produced MSW-BC was an economical adsorbent which demonstrated a strong ability for removing VOCs. Hence, MSW-BC can be used as a landfill cover or a permeable reactive barrier material to treat MSW leachate. Thus, the conversion of MSW to BC becomes an environmentally friendly and economical means of solid waste remediation.
使用城市固体废物生物炭（MSW-BC）从水溶液中修复挥发性有机化合物（VOCs）已经过评估。城市固体废物在现场热解炉中于 450°C 左右热解，保持时间为 30 分钟，以生产生物炭（BC）。BC 的物理化学性质基于 X 射线荧光（XRF）和傅里叶变换红外（FTIR）分析进行评估。通过批量吸附实验研究了 BC 对 VOC（间二甲苯和甲苯）的吸附能力。分析表明，不同垃圾场的垃圾渗滤液中含有高浓度的间二甲苯和甲苯。FTIR 分析与 Boehm 滴定数据相符，而 XRF 数据表明 MSW-BC 中的痕量金属含量可忽略不计，是一种有潜力的吸附剂。吸附等温线表现出朗缪尔和弗伦德利希的特性，表明正在发生非理想单层吸附过程。甲苯和间二甲苯的朗缪尔吸附容量分别高达 850 和 550μg/g。将 MSW 转化为增值产品为固体废物管理提供了可行的方法。所生产的 MSW-BC 是一种经济的吸附剂，具有很强的去除 VOCs 的能力。因此，MSW-BC 可用作垃圾填埋场覆盖物或可渗透反应性屏障材料来处理垃圾渗滤液。因此，将 MSW 转化为 BC 成为一种环保且经济的固体废物修复方法。
