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Published in J Environ Qual 27:750-754 (1998)
© 1998 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Microbial-Mediated Reduction of Perchlorate in Groundwater

David C. Herman and William T. Frankenberger, Jr.*

Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521.

* Corresponding author (william.frankenberger{at}ucr.edu).

ABSTRACT

Perchlorate has been widely used as a propellant in solid rocket fuel, and has recently been identified as a contaminant in both groundwater and surface waters. Perchlorate is recognized by the U.S. Environmental Protection Agency (USEPA) as a potential health risk, and the State of California has set a drinking water action level of 18 µg L–1. Incidents of groundwater contamination have been associated with industrial sites in California and Nevada that have been involved in the manufacturing or testing of solid rocket propellants. Microorganisms have been shown to be capable of reducing perchlorate (Cl O–4) to chloride (Cl–) and oxygen, thus transforming perchlorate into innocuous end-products. Bioreactor processes for the remediation of perchlorate contaminated wastewater have previously been established. However, these systems were optimized for perchlorate concentrations in the grams per liter range, while groundwater contamination can be a million-fold lower but still exceed the water quality action level. This literature review will focus on microbial-mediated perchlorate reduction, and discuss issues of importance to the remediation of perchlorate-contaminated groundwater.

Received for publication October 31, 1997.


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