Abstract: Ethylenediaminetetraacetic acid (EDTA) is one of the more common chelating agents used in the extraction of heavy metals from soil. For soil extraction processes to be economically competitive with other remedial technologies, ...

Abstract: Several approaches can be used to activate persulfate anion (S2O82−) and peroxymonosulfate anion (HSO5−) to generate sulfate free radical (SO4−∙), a powerful oxidizing agent. In this study, we investigate ferrous ion (Fe2+) ...

Abstract: A steady‐state approach for designing biological wastewater treatment systems is developed for inhibitory substrates using the Haldane rate expression. Steady‐state solutions are derived for a continuous‐flow completely ...

Abstract: An existing multidisciplinary course on sustainable engineering in developing societies was expanded to include sustainability issues and challenges faced in the developed world. The new course consisted of independent ...

Abstract: The dissolution, diffusion, and volatilization of a free-phase benzene glob in the presence of air sparging were measured in laboratory-scale air sparging reactors and modeled using a dissolution–diffusion–volatilization ...

Abstract: Nonequilibrium air-water mass transfer experiments for six volatile organic compounds (VOCs) were conducted using a bench-scale air sparging system. VOCs used were carbon tetrachloride, trichloroethylene, tetrachloroethylene, ...

Abstract: There is significant concern in water utilities regarding the permeation of petroleum-based hydrocarbons from contaminated sites through potable drinking-water pipes made of polyvinyl chloride (PVC). Previous studies have ...

Abstract: A direct solvent-extraction method was evaluated to assess its application for the extraction and analysis of PAHs (polycyclic aromatic hydrocarbons) in coal-tar-contaminated soils. Eight individual solvents and two combined ...

Abstract: Organic contaminants may permeate through plastic pipes in water distribution systems and adversely affect the quality of drinking water. In this study, we developed a microscopic visualization technique to investigate the ...