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 (1991) RFA Text |  Recipients Lists
Research Category: SBIR - Waste , Hazardous Waste/Remediation , Small Business Innovation Research (SBIR)


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:

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

Progress and Final Reports:

  • Final