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SORPTION OF TOXIC ORGANIC COMPOUNDS ON WASTEWATER SOLIDS: MECHANISM AND MODELING
Citation:
Wang, L., R. Govind, AND R. Dobbs. SORPTION OF TOXIC ORGANIC COMPOUNDS ON WASTEWATER SOLIDS: MECHANISM AND MODELING. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/011 (NTIS PB93150191).
Description:
Sorption of toxic organic compounds on wastewater solids is an important process in conventional biological wastewater treatment systems. he extent of accumulation of toxic organic compounds by sorption onto wastewater solids not only affects the efficiency of the treatment system, but also impacts the management of wastewater solids. his study is an attempt to propose a mechanism for understanding the sorption phenomenon and to develop a model for sorption on wastewater solids based on the proposed mechanism. It was postulated that sorption was a combination of two processes: adsorption and partitioning. orption model was developed for both single component and multicomponent systems. he model was tested using single component experimental isotherm data of eight toxic organic compounds. he present model generally fits the data better than the Freundlich model and the linear model for single component sorption isotherms. artitioning dominates the sorption process for compounds with high sorbability or high octanol/water partition coefficient, Kow. inary sorption data were compared with the present model. he proposed model fitted experimental data well. t was found that Kow could be used to assess the competition effect in a multicomponent system. he competition is negligible when Kow is larger than 1000. hen Kow is smaller than 500, there is a significant competition effect. n a very dilute solution, the effect of the presence of a competing species can be ignored.
