UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX Delft, The Netherlands; Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand.
Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
J Environ Manage. 2015 Feb 1;149:263-70. doi: 10.1016/j.jenvman.2014.10.024. Epub 2014 Nov 15.
Sulfide is the product of the biological sulfate reduction process which gives toxicity and odor problems. Wastewaters or bioreactor effluents containing sulfide can cause severe environmental impacts. Electrochemical treatment can be an alternative approach for sulfide removal and sulfur recovery from such sulfide rich solutions. This study aims to develop a spontaneous electrochemical sulfide oxidation/vanadium(V) reduction cell with a graphite electrode system to recover sulfide as elemental sulfur. The effects of the internal and external resistance on the sulfide removal efficiency and electrical current produced were investigated at different pH. A high surface area of the graphite electrode is required in order to have as less internal resistance as possible. In this study, graphite powder was added (contact area >633 cm(2)) in order to reduce the internal resistance. A sulfide removal efficiency up to 91% and electrical charge of more than 400 C were achieved when using five graphite rods supplemented with graphite powder as the electrode at an external resistance of 30 Ω and a sulfide concentration of 250 mg L(-1).
硫化物是生物硫酸盐还原过程的产物，会带来毒性和气味问题。含有硫化物的废水或生物反应器流出物会对环境造成严重影响。电化学处理是从富含硫化物的溶液中去除硫化物和回收硫的一种替代方法。本研究旨在开发一种带有石墨电极系统的自发式电化学硫化物氧化/钒(V)还原电池，以将硫化物还原为单质硫。在不同 pH 值下，研究了内、外电阻对硫化物去除效率和电流产生的影响。为了尽可能降低内阻，需要使用具有较大表面积的石墨电极。在这项研究中，添加了石墨粉末（接触面积>633cm(2)）以降低内阻。当在外阻为 30Ω、硫化物浓度为 250mg/L(-1)时，使用五根补充了石墨粉末的石墨棒作为电极，可实现高达 91%的硫化物去除效率和超过 400C 的电荷量。
