The University of Queensland, Advanced Water Management Centre (AWMC), St. Lucia, QLD 4072, Australia.
Water Res. 2010 Apr;44(8):2563-71. doi: 10.1016/j.watres.2010.01.008. Epub 2010 Jan 25.
Sulfide can be removed from wastewater and recovered as elemental sulfur using an electrochemical process. Recently, we demonstrated this principle of product recovery on synthetic feeds. Here, we present a lab scale electrochemical reactor continuously removing sulfide from the effluent of an anaerobic treatment process operated on paper mill wastewater. The effluent contained 44+/-7 mg of sulfide-S L(-1). Sulfide was reduced to 8+/-2 mg-S L(-1), at a removal rate of 0.845+/-0.133 kg-S m(-3) of total anodic compartment (TAC) d(-1). The removed sulfide was recovered (75+/-4% recovery) as pure concentrated alkaline sulfide/polysulfide solution, from which solid elemental sulfur was obtained. The electrochemical sulfide removal was not affected by different soluble constituents or particulate materials present in the wastewater. However, over time sulfide removal decreased due to biological sulfur reduction using the organics present in the wastewater. Therefore, a periodic switching strategy between anode and cathode was developed. Biofilm formation was avoided as the pH of the cathode solution increased to inhibitory levels during cathodic operation, while still allowing full recovery of the sulfur as end product.
采用电化学方法可以从废水中去除硫化物并回收元素硫。最近，我们在合成饲料上证明了这种产物回收的原理。在这里，我们提出了一个实验室规模的电化学反应器，可以连续从造纸厂废水处理的厌氧处理工艺的流出物中去除硫化物。流出物中含有 44+/-7mg 的硫化物-S L(-1)。硫化物被还原至 8+/-2mg-S L(-1)，总阳极室（TAC）每天去除 0.845+/-0.133kg-S m(-3)。去除的硫化物被回收（75+/-4%的回收率）为纯的浓缩碱性硫化物/多硫化物溶液，从中可以获得固体元素硫。电化学去除硫化物不受废水中存在的不同可溶性成分或颗粒物质的影响。然而，随着时间的推移，由于废水中存在的有机物的生物还原，硫化物的去除率下降。因此，开发了一种在阳极和阴极之间周期性切换的策略。由于阴极操作期间阴极溶液的 pH 值升高到抑制水平，避免了生物膜的形成，同时仍然允许将硫作为最终产物完全回收。
