Khulna is the 3rd largest city corporation in Bangladesh that produces 450 tons of Municipal solid waste (MSW) per day and dumps the waste in the Rajbandh open dump site. The main focus of this study is to determine the fate of chemicals in different environmental media at the Rajbandh open dump site. To accomplish the aim Level III fugacity model was evaluated which is subject to steady-state partitioning, reaction, advection, and intercompartmental transfer in an evaluative environment consisting of three compartments landfill gas (LFG), leachate, and waste. In this study, the model was implemented for six chemicals Trichloroethylene, Mono-chlorobenzene, 1,4-dichlorobenzene, 1,2,4-trichlorobenzene, Hexachlorobenzene, and Benzene having different physiochemical properties. The result reveals that Benzene was found with the highest fugacity value of 2.03E + 00 Pa in all compartments while Hexachlorobenzene shows the highest value of concentration 2.67E-01 mol/m3 in the waste compartment. Regarding mass distribution, all chemical shows a higher mass remaining in the waste compartment in comparison with the other compartment. The result also reveals that the dominating removal process of a chemical from the system is the reaction process. For all the chemicals almost all the mass is removed from the environment by reaction process rather than advection in LFG and leachate. Finally, the estimated behavior of the selected chemical will help to evaluate the health and ecological hazards at the open dump site and take necessary steps to control the emission of such hazardous chemicals from the open dump site by the authority.

中文翻译：

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使用 III 级逸度模型评估痕量有机化合物的归宿：以孟加拉国库尔纳市 Rajbandh 露天垃圾场为例

库尔纳是孟加拉国第三大城市企业，每天生产 450 吨城市固体废物 (MSW)，并将废物倾倒在 Rajbandh 露天垃圾场。本研究的主要重点是确定拉杰班德露天垃圾场不同环境介质中化学品的归宿。为了实现这一目标，对 III 级逸度模型进行了评估，该模型在由三个隔室垃圾填埋气 (LFG)、渗滤液和废物组成的评估环境中进行稳态分配、反应、平流和隔室间传递。在本研究中，该模型针对具有不同理化性质的六种化学品：三氯乙烯、一氯苯、1,4-二氯苯、1,2,4-三氯苯、六氯苯和苯。结果表明，苯在所有隔间中的逸度值最高为 2.03E + 00 Pa，而六氯苯在废物隔间中的浓度最高值为 2.67E-01 mol/m3。关于质量分布，与其他隔室相比，所有化学品都显示出废物隔室中剩余的更高质量。结果还表明，化学物质从系统中去除的主要过程是反应过程。对于所有化学物质，几乎所有物质都是通过反应过程而不是垃圾填埋气和渗滤液中的平流从环境中去除的。最后，