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Emulsion Liquid Membrane Extraction of Chromium(VI) from Superfund Sites

EPA Contract Number: 68D10050
Title: Emulsion Liquid Membrane Extraction of Chromium(VI) from Superfund Sites
Investigators: Wright, John D.
Small Business: TDA Research Inc.
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: September 1, 1991 through March 1, 1992
Project Amount: $50,000
RFA: Small Business Innovation Research (SBIR) - Phase I (1990)
Research Category: Hazardous Waste/Remediation , SBIR - Remediation

Description:

Chromium contamination is present at over one-half of the Superfund Sites. Chromium(VI) is a strong oxidizer toxic, carcinogenic, and is particularly difficult to manage because chromium is usually present as an anion. It has little interaction with the soil, resulting in widespread ground- water contamination, and it cannot be treated by conven- tional processes which are designed to remove cations. Conventional processes for chromium removal (reduction followed by precipitation) are very expensive for the dilute streams typical of ground-water contamination. Therefore, TDA Research proposes the use of Emulsion Liquid Mem- branes (ELM) to preconcentrate chromium contaminated water, which could result from pump-and-treat, in situ soil washing, for on-site extraction. By combining both a complexing and strapping agent in a single unit operation, ELM is capable of concentrating chromium by a factor of greater than 1000. In Phase 1, TDA Research would develop a suitable emulsion (solvent, completing agent, surfactant, and stripping agent), conduct experiments to demonstrate process feasibility, and carry out economic analyses to compare TDA Research's ELM process with other competing chromium concentration and/or removal processes.

Supplemental Keywords:

Toxics, Economic, Social, & Behavioral Science Research Program, Water, Sustainable Industry/Business, Scientific Discipline, Waste, Technology for Sustainable Environment, Engineering, Chemistry, & Physics, Chemistry, Economics & Decision Making, Environmental Engineering, cleaner production/pollution prevention, Environmental Chemistry, Chemistry and Materials Science, Hazardous, New/Innovative technologies, National Recommended Water Quality, 33/50, hexavalent chromium, Market mechanisms, heavy metals, econometric analysis, carcinogen, membrane technology, chromium & chromium compounds, econometrics, surfactant, extraction of metals, solvents, surfactants, Superfund sites, economic analysis, complexing agents, Chromium, groundwater, metal removal, liquid membrane process, groundwater contamination, hazardous waste, metals removal, emulsion liquid membranes (ELM), contaminants, extraction, innovative technologies, restoration

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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