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Removal of Selenate in Simulated Agricultural Drainage Water by a Rice Straw Bioreactor Channel System
Author(s) -
Zhang Yiqiang,
Frankenberger William T.
Publication year - 2003
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2003.1650
Subject(s) - drainage , selenate , straw , oryza sativa , chemistry , nitrate , environmental science , environmental chemistry , agronomy , selenium , environmental engineering , ecology , biology , inorganic chemistry , biochemistry , organic chemistry , gene
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 NO − 3 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.