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TECHNICAL REPORTS

Bioremediation and Biodegradation

Biological Reduction of Chlorate in a Gas-Lift Reactor Using Hydrogen as an Energy Source

Akzo Nobel Chemicals, P.O. Box 9300, 6800 SB Arnhem, the Netherlands

^* Corresponding author (kees.vanginkel{at}akzonobel-chemicals.com)

Received for publication February 12, 2004. Chlorate release into the environment occurs with its manufacture and use. Biological reduction of chlorate offers an attractive option to decrease this release. A hydrogen gas-lift reactor with microorganisms attached to pumice particles was used for the treatment of wastewater containing high concentrations of chlorate. The microorganisms used chlorate as an electron acceptor and hydrogen gas as a reducing agent. After a start-up period of only a few weeks, chlorate reduction rates of 3.2 mmol L^–1 h^–1 were achieved during continuous operation. During this period, a hydrogen consumption rate of 14.5 mmol L^–1 h^–1 was observed. Complete removal of chlorate was maintained at hydraulic retention times of 6 h. This study clearly demonstrates the potential of hydrogen gas-lift bioreactors for the treatment of chlorate-containing waste streams.

Abbreviations: HRT, hydraulic retention time

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This Issue in Journal of Environmental Quality

JEQ 2004 33: 1947-1953. [Full Text]