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SEPARATION OF HAZARDOUS ORGANICS BY LOW PRESSURE MEMBRANES: TREATMENT OF SOIL-WASH RINSE-WATER LEACHATES
Citation:
Bhattacharyya, D. AND A. Kothari. SEPARATION OF HAZARDOUS ORGANICS BY LOW PRESSURE MEMBRANES: TREATMENT OF SOIL-WASH RINSE-WATER LEACHATES. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-92/035 (NTIS 92-153436), 1992.
Description:
Soil washing is a promising technology for treating contaminated soils. In the present work, low-pressure, thin-film composite membranes were evaluated to treat the soil-wash leachates so that the treated water could be recycled back to the soil washing step. Experiments were done with SARM (Synthetic Analytical Reference Matrix) soils. Membrane performance was evaluated with leachates obtained from different wash solutions. The effect of fine suspensions in the leachates was also studied. A solution-diffusion model was modified to include an adsorption resistance term in water flux, and this term was correlated with bulk concentration using the Freundlich isotherm. The correlation was then used to predict water flux drop at different bulk concentrations or to predict water flux at different recoveries. Thin-film composite membranes were found to effectively treat the leachate from rinse water used to wash contaminated soil. In addition, feed preozonation significantly improved water flux.