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DEMONSTRATION BULLETIN: METAL-ENHANCED ABIOTIC DEGRADATION TECHNOLOGY - ENVIROMETAL TECHNOLOGIES, INC.
Citation:
Kreiton*, K. L. DEMONSTRATION BULLETIN: METAL-ENHANCED ABIOTIC DEGRADATION TECHNOLOGY - ENVIROMETAL TECHNOLOGIES, INC. U.S. Environmental Protection Agency, Washington, DC, EPA/540/MR-95/510, 1995.
Description:
EnviroMetal Technologies, Inc. (ETI), of Guelph, ON, Canada, has developed the metal-enhanced abiotic degradation technology to treat halogenated volatile organic compounds (VOC) in water. A reactive, zero-valent, granular iron medium causes reductive dehalogenation of VOCs yielding simple hydrocarbons and halogen salts as byproducts. The ETI technology can be installed and operated aboveground in a reactor, or in situ, as a continuous wall or a :funnel and gate system. The SITE Program evaluated an aboveground reactor for remediation of groundwater from the SQL Printed Circuits site in Wayne, NJ over 3 months during 1994 and 1995. Based on ETI's laboratory studies, the technology was designed to lower chlorinated VOC concentrations below regulatory limits after one pass through the reactive iron medium. The aboveground reactor design may be used to simulate the treatment process at pilot scale, allowing for measurement, control, modification, and optimization of design and operating parameters, or may be operated as a stand-alone treatment unit. Contaminated groundwater enters the reactor through an air eliminator, 5-|im water filter (to remove suspended solids which may inhibit flow through the reactive iron medium), and flow meter. Water flows by gravity through the reactive iron medium and into the collector line at the bottom of the reactor, and then exits through the effluent line. The effluent line is plumbed such that about 2 ft of influent water remains ponded above the surface of the reactive iron medium. A passive gas vent in the top of the reactor prevents accumulation of excess pressure. A manhole with a sightglass allows observation of the reactive iron surface and access to the tank interior. The demonstration system included the reactive iron medium, well sand, a fiberglass reactor tank for the aboveground installation, and appropriate ancillary groundwater pumps and piping, where necessary.