Qian Jin, Wang Lianlian, Wu Yaoguo, Bond Philip L, Zhang Yuhan, Chang Xing, Deng Baixue, Wei Li, Li Qin, Wang Qilin
Department of Applied Chemistry, School of Natural and Applied Sciences, Northwestern Polytechnical University, NO. 127 West Youyi Road, Xi'an 710072, China; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, China; Research Center for Ecology and Environmental Sciences, Northwestern Polytechnical University, NO. 127 West Youyi Road, Xi'an 710072, China.
Department of Applied Chemistry, School of Natural and Applied Sciences, Northwestern Polytechnical University, NO. 127 West Youyi Road, Xi'an 710072, China.
Chemosphere. 2017 Jun;176:212-220. doi: 10.1016/j.chemosphere.2017.02.117. Epub 2017 Feb 24.
A sulfur cycle-based bioprocess for co-treatment of wet flue gas desulfurization (WFGD) wastes with freshwater sewage has been developed. In this process the removal of organic carbon is mainly associated with biological sulfate or sulfite reduction. Thiosulfate is a major intermediate during biological sulfate/sulfite reduction, and its reduction to sulfide is the rate-limiting step. In this study, the impacts of saline sulfite (the ionized form: HSO + SO) and free sulfurous acid (FSA, the unionized form: HSO) sourced from WGFD wastes on the biological thiosulfate reduction (BTR) activities were thoroughly investigated. The BTR activity and sulfate/sulfite-reducing bacteria (SRB) populations in the thiosulfate-reducing up-flow anaerobic sludge bed (UASB) reactor decreased when the FSA was added to the UASB influent. Batch experiment results confirmed that FSA, instead of saline sulfite, was the true inhibitor of BTR. And BTR activities dropped by 50% as the FSA concentrations were increased from 8.0 × 10 to 2.0 × 10 mg HSO-S/L. From an engineering perspective, the findings of this study provide some hints on how to ensure effective thiosulfate accumulation in biological sulfate/sulfite reduction for the subsequent denitrification/denitritation. Such manipulation would result in higher nitrogen removal rates in this co-treatment process of WFGD wastes with municipal sewage.
已开发出一种基于硫循环的生物工艺，用于协同处理湿法烟气脱硫（WFGD）废弃物与淡水污水。在此过程中，有机碳的去除主要与生物硫酸盐或亚硫酸盐还原相关。硫代硫酸盐是生物硫酸盐/亚硫酸盐还原过程中的主要中间产物，其还原为硫化物是限速步骤。在本研究中，对源自WFGD废弃物的亚硫酸盐碱（离子化形式：HSO₃⁻ + SO₃²⁻）和游离亚硫酸（FSA，非离子化形式：H₂SO₃）对生物硫代硫酸盐还原（BTR）活性的影响进行了深入研究。当向UASB进水添加FSA时，硫代硫酸盐还原上流式厌氧污泥床（UASB）反应器中的BTR活性和硫酸盐/亚硫酸盐还原菌（SRB）数量降低。批次实验结果证实，FSA而非亚硫酸盐碱是BTR的真正抑制剂。随着FSA浓度从8.0×10⁻³增加到2.0×10⁻²mg H₂SO₃-S/L，BTR活性下降了50%。从工程角度来看，本研究结果为如何确保在生物硫酸盐/亚硫酸盐还原过程中有效积累硫代硫酸盐以用于后续反硝化/脱硝提供了一些线索。这种操作将在WFGD废弃物与城市污水的协同处理过程中实现更高的氮去除率。
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