Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, P.O. Box 1113, Leeuwarden, 8911 MA, the Netherlands; Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden.
Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, P.O. Box 1113, Leeuwarden, 8911 MA, the Netherlands.
J Hazard Mater. 2019 Feb 5;363:197-204. doi: 10.1016/j.jhazmat.2018.09.049. Epub 2018 Sep 20.
Several industrial processes produce toxic sulfide containing streams that are often scrubbed using caustic solutions. An alternative, cost effective sulfide treatment method is bioelectrochemical sulfide removal. For the first time, a haloalkaliphilic sulfide-oxidizing microbial consortium was introduced to the anodic chamber of a microbial electrolysis cell operated at alkaline pH and with 1.0 M sodium ions. Under anode potential control, the highest sulfide removal rate was 2.16 mM/day and chemical analysis supported that the electrical current generation was from the sulfide oxidation. Biotic operation produced a maximum current density of 3625 mA/m compared to 210 mA/m while under abiotic operation. Furthermore, biotic electrical production was maintained for a longer period than for abiotic operation, potentially due to the passivation of the electrode by elemental sulfur during abiotic operation. The use of microorganisms reduced the energy input in this study compared to published electrochemical sulfide removal technologies. Sulfide-oxidizing populations dominated both the planktonic and electrode-attached communities with 16S rRNA gene sequences aligning within the genera Thioalkalivibrio, Thioalkalimicrobium, and Desulfurivibrio. The dominance of the Desulfurivibrio-like population on the anode surface offered evidence for the first haloalkaliphilic bacterium able to couple electrons from sulfide oxidation to extracellular electron transfer to the anode.
许多工业过程会产生含有有毒硫化物的废水，这些废水通常使用碱性溶液进行洗涤。生物电化学硫化物去除是一种替代的、具有成本效益的硫化物处理方法。本文首次将一种耐盐耐碱的硫化物氧化微生物混合体引入到微生物电解池的阳极室中，该电解池在碱性 pH 值和 1.0 M 钠离子条件下运行。在阳极电势控制下，最高的硫化物去除率为 2.16 mM/天，化学分析表明电流的产生来自硫化物的氧化。与非生物操作相比，生物操作产生的最大电流密度为 3625 mA/m，而在非生物操作下为 210 mA/m。此外，生物电的产生比非生物操作维持的时间更长，这可能是由于非生物操作过程中单质硫对电极的钝化。与已发表的电化学硫化物去除技术相比，本研究中使用微生物减少了能量输入。在浮游生物和电极附着群落中，硫氧化种群都占主导地位，16S rRNA 基因序列与硫代碱杆菌属、硫代碱微菌属和脱硫弧菌属内的属一致。阳极表面上脱硫弧菌样种群的优势为能够将电子从硫化物氧化耦合到细胞外电子转移到阳极的第一个耐盐耐碱细菌提供了证据。
