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TECHNICAL REPORTS

Bioremediation and Biodegradation

Removal of Selenate in Simulated Agricultural Drainage Water by a Rice Straw Bioreactor Channel System

Department of Environmental Sciences, University of California, Riverside, CA 92521-0424

^* Corresponding author (williamf{at}orange.ucr.edu).

Received for publication September 30, 2002. Removal of selenium (Se) from agricultural drainage water is important in protecting wetland wildlife. Three flow-through bioreactor channel systems (BCSs), each with three channels filled with rice (Oryza sativa L.) straw, were set in the laboratory to determine removal of selenate [Se(VI)] (1020 µg L^-1) from drainage water with a salinity of 10.4 dS m^-1, a pH of 8.1, and a nitrate range of 0 to 100 mg L^-1. Results showed that the rice straw effectively reduced Se(VI) during 122 to 165 d of the experiments. Calculation of Se mass in the three BCSs showed that 89.5 to 91.9% of the input Se(VI) was reduced to red elemental Se [Se(0)], where 96.6 to 98.2% was trapped in the BCSs. Losses of each gram of rice straw were almost equal to the removal of 1.66 mg of Se from the drainage water as a form of red Se(0), indicating that rice straw is a very effective organic source for removing Se(VI) from drainage water.

Abbreviations: BCS, bioreactor channel system • SS, sampling site

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This Issue in Journal of Environmental Quality

JEQ 2003 32: 1577-1582. [Full Text]