Biological treatment of selenate-containing saline wastewater by activated sludge under oxygen-limiting conditions

Water Research
Yuanyuan ZhangMichihiko Ike

Abstract

Selenium often coincides with high salinity in certain industrial wastewaters, which can be a limitation in the practical application of biological treatment. However, there are no studies on the biological treatment of selenate-containing saline wastewater. A sequencing batch reactor inoculated with activated sludge was applied to treat selenate in the presence of 3% (w/v) NaCl. Start-up of the sequencing batch reactor with a 7-day cycle duration and excessive acetate as the sole carbon source succeeded in removing above 98% and 72% soluble and solid selenium, respectively, under oxygen-limiting conditions. Further selenium removal experiments with a shorter cycle duration of 3 days and a stepwise decrease of acetate addition achieved soluble and total selenium removal efficiencies in most batches above 96% and 80%, respectively. Mass balance analysis revealed that selenate was converted into elemental selenium, most of which was accumulated in the sludge. Microscopic analyses also found that elemental selenium particles were primarily present as approximately 2 μm large rods, with some extremely large particles above 10 μm. Although the bacterial populations responsible for selenium removal, especially selenate reduction, cou...Continue Reading

Citations

Aug 29, 2020·Critical Reviews in Biotechnology·Jesus J OjedaPhilip H E Gardiner
Feb 24, 2020·World Journal of Microbiology & Biotechnology·Yiyi ZhaoShou-Qing Ni
Jun 27, 2021·Bulletin of Environmental Contamination and Toxicology·Taotao ZengAijie Wang
Aug 14, 2020·Environmental Science & Technology·Ting-Ting ZhuHan-Qing Yu
Aug 23, 2021·Journal of Hazardous Materials·Liuliu LiAlistair G L Borthwick

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