An Innovative Process of Simultaneous Desulfurization and Denitrification by Thiobacillus denitrificans
An Innovative Process of Simultaneous Desulfurization and Denitrification by Thiobacillus denitrificans
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DOI：
10.1080/10934520500184590
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发表时间：
2005-10
期刊：
影响因子：
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通讯作者：
Ai-Jie Wang;Da-zhong Du;N. Ren;J. V. van Groenestijn
中科院分区：
文献类型：
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作者：
Ai-Jie Wang;Da-zhong Du;N. Ren;J. V. van Groenestijn
摘要 脱氮硫杆菌是一类自养型兼性厌氧细菌，在缺氧条件下，以硝酸盐为电子受体，以二氧化碳为唯一碳源，能够将硫化物氧化成单质硫。这样，硫在细胞外积累，硝酸盐转化为氮气。基于这些特殊的生理特性，开发了同步脱硫反硝化（SDD）的创新工艺，从硫化物中获取硫。在本研究中分离出一株反硝化菌，命名为 D4，并用作硫生产剂。还推导了反硝化菌 SDD 的化学计量方程。通过连续流和批量测试研究了影响该过程的关键因素。实验结果表明，进水中硫化物浓度和S2−/NO3−比例是关键因素。建议其合适水平分别控制在300 mg/L以下和5/3~5/2以下，以达到较高的硫转化率。
Abstract Thiobacillus denitrificans, a species of autotrophic facultative anaerobic bacterium, was found to be capable of oxidizing sulfide into elemental sulfur when nitrate was adopted as its electron acceptor and carbon dioxide as its sole carbon source under anoxic conditions. In this way, sulfur was accumulated extracellularly and nitrate was converted into nitrogen gas. Based on these special physiological characteristics, an innovative process of simultaneous desulfurization and denitrification (SDD) was developed to obtain sulfur from sulfide. A strain of T. denitrificans, named D4, was isolated and used as sulfur producers in this study. The stoichiometric equations of SDD by T. denitrificans were also derived. The key factors affecting this process were investigated through continuous-flow and batch tests. The experimental results indicated that both the sulfide concentration and the ratio of S2−/NO3 − in the influent are key factors. Their suitable levels are suggested to be controlled less than 300 mg/L and 5/3–5/2, respectively, to achieve a high sulfur conversion degree.