Electrocoagulation of colloidal biogenic selenium
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- 作者：Lucian C. Staicu ; Eric D. van Hullebusch…
- 关键词：Elemental selenium ; Colloids ; Electrocoagulation ; Aluminum electrodes ; Iron electrodes ; TCLP
- 刊名：Environmental Science and Pollution Research
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：22
- 期：4
- 页码：3127-3137
- 全文大小：746 KB
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文摘
Colloidal elemental selenium (Se(0)) adversely affects membrane separation processes and aquatic ecosystems. As a solution to this problem, we investigated for the first time the removal potential of Se(0) by electrocoagulation process. Colloidal Se(0) was produced by a strain of Pseudomonas fluorescens and showed limited gravitational settling. Therefore, iron (Fe) and aluminum (Al) sacrificial electrodes were used in a batch reactor under galvanostatic conditions. The best Se(0) turbidity removal (97?%) was achieved using iron electrodes at 200?mA. Aluminum electrodes removed 96?% of colloidal Se(0) only at a higher current intensity (300?mA). At the best Se(0) removal efficiency, electrocoagulation using Fe electrode removed 93?% of the Se concentration, whereas with Al electrodes the Se removal efficiency reached only 54?%. Due to the less compact nature of the Al flocs, the Se-Al sediment was three times more voluminous than the Se-Fe sediment. The toxicity characteristic leaching procedure (TCLP) test showed that the Fe-Se sediment released Se below the regulatory level (1?mg?L?), whereas the Se concentration leached from the Al-Se sediment exceeded the limit by about 20 times. This might be related to the mineralogical nature of the sediments. Electron scanning micrographs showed Fe-Se sediments with a reticular structure, whereas the Al-Se sediments lacked an organized structure. Overall, the results obtained showed that the use of Fe electrodes as soluble anode in electrocoagulation constitutes a better option than Al electrodes for the electrochemical sedimentation of colloidal Se(0).