Zhang Yiqiang, Frankenberger William T
Department of Environmental Sciences, University of California, Riverside, CA 92521-0424, USA.
J Environ Qual. 2003 Sep-Oct;32(5):1650-7. doi: 10.2134/jeq2003.1650.
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 microg L(-1)) from drainage water with a salinity of 10.4 dS m(-1), a pH of 8.1, and a nitrate (NO3-) 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.
从农业排水中去除硒（Se）对于保护湿地野生动物至关重要。在实验室中设置了三个连续流生物反应器通道系统（BCS），每个系统有三个填充水稻（Oryza sativa L.）秸秆的通道，以测定在盐度为10.4 dS m(-1)、pH为8.1且硝酸盐（NO3-）范围为0至100 mg L(-1)的排水中硒酸盐[Se(VI)]（1020 μg L(-1)）的去除情况。结果表明，在122至165天的实验期间，水稻秸秆有效地还原了Se(VI)。对三个BCS中硒质量的计算表明，输入的Se(VI)中有89.5%至91.9%被还原为红色元素硒[Se(0)]，其中96.6%至98.2%被困在BCS中。每克水稻秸秆的损失几乎等同于以红色Se(0)形式从排水中去除1.66 mg的硒，这表明水稻秸秆是从排水中去除Se(VI)的非常有效的有机来源。
