Laboratory of Microbiology, Wageningen University , Stippeneng 4, 6708 WE Wageningen, The Netherlands.
Wetsus , European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA Leeuwarden, The Netherlands.
Environ Sci Technol. 2017 Jan 17;51(2):914-923. doi: 10.1021/acs.est.6b04497. Epub 2017 Jan 6.
In industrial gas biodesulfurization systems, where haloalkaline conditions prevail, a thiosulfate containing bleed stream is produced. This bleed stream can be treated in a separate bioreactor by reducing thiosulfate to sulfide and recycling it. By performing treatment and recycling of the bleed stream, its disposal decreases and less caustics are required to maintain the high pH. In this study, anaerobic microbial thiosulfate conversion to sulfide in a H/CO fed bioreactor operated at haloalkaline conditions was investigated. Thiosulfate was converted by reduction to sulfide as well as disproportionation to sulfide and sulfate. Formate production from H/CO was observed as an important reaction in the bioreactor. Formate, rather than H, might have been used as the main electron donor by thiosulfate/sulfate-reducing bacteria. The microbial community was dominated by bacteria belonging to the family Clostridiaceae most closely related to Tindallia texcoconensis. Bacteria phylogenetically related to known haloalkaline sulfate and thiosulfate reducers, thiosulfate-disproportionating bacteria, and remarkably sulfur-oxidizing bacteria were also detected. On the basis of the results, two approaches to treat the biodesulfurization waste stream are proposed: (i) addition of electron donor to reduce thiosulfate to sulfide and (ii) thiosulfate disproportionation without the need for an electron donor. The concept of application of solely thiosulfate disproportionation is discussed.
在工业气体生物脱硫系统中，通常存在卤碱性条件，会产生含有硫代硫酸盐的放流。可以在单独的生物反应器中处理该放流，通过将硫代硫酸盐还原为硫化物并进行回收利用。通过对放流进行处理和回收，可以减少其处置量，并减少维持高 pH 值所需的苛性碱量。在这项研究中，研究了在卤碱性条件下，以 H/CO 为进料的生物反应器中厌氧微生物将硫代硫酸盐转化为硫化物的情况。硫代硫酸盐通过还原转化为硫化物，以及歧化转化为硫化物和硫酸盐。在生物反应器中观察到 H/CO 生成甲酸盐是一个重要的反应。甲酸盐可能已被硫代硫酸盐/硫酸盐还原菌用作主要电子供体，而非 H。微生物群落主要由与 Tindallia texcoconensis 关系最密切的梭菌科细菌组成。还检测到与已知的卤碱性硫酸盐和硫代硫酸盐还原菌、硫代硫酸盐歧化菌以及显著的硫氧化菌有关的细菌。基于这些结果，提出了两种处理生物脱硫废水的方法：(i) 添加电子供体将硫代硫酸盐还原为硫化物，以及 (ii) 无需电子供体进行硫代硫酸盐歧化。还讨论了仅应用硫代硫酸盐歧化的概念。
