Bio-reduction mechanism of V(V) by thermophilic hydrogen-producing bacteria under acidic conditions,Environmental Science: Water Research & Technology

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Bio-reduction mechanism of V(V) by thermophilic hydrogen-producing bacteria under acidic conditions
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-07-06 , DOI: 10.1039/d1ew00355k
Xin Zheng ₁ , Bo Zhao ₁ , Chunguang Liu _{1,

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Affiliation

To solve the challenge caused by the higher temperature and lower pH of industrial vanadium-containing wastewater, a research on the reduction of vanadium by thermophilic bacteria was conducted at 55 °C and pH 4.2–5.8 in an anaerobic hydrogen fermenter. Results show that 100 mg L⁻¹ of V(V) can be completely reduced (97.75%) to tetravalent vanadium (V(IV)) through biological and chemical pathways. Thermophilic Bacilli and Clostridia dominate V(V) reduction in the first-order exponential decay mode. Both glucose and metabolites (volatile fatty acids and hydrogen) serve as electron donors, and the addition of glucose shows better enhancement for V(V) reduction than the addition of acetic acid. Thermophilic hydrogen-producing bacteria enhance the reduction of V(V) by regulating the intracellular metabolism and secretion of extracellular polymers. Extracellular NADH, riboflavin, and intracellular glutathione (GSH) play important roles in V(V) reduction. The results suggest that thermophilic hydrogen-producing bacteria can be used for V(V) reduction at higher temperatures, and provide a reference for the development of the V(V) biological reduction technology.

中文翻译：

酸性条件下嗜热产氢菌对V(V)的生物还原机理

为解决工业含钒废水温度较高、pH 较低的难题，在厌氧氢发酵罐中，在 55 °C 和 pH 4.2-5.8 的条件下，进行了嗜热细菌还原钒的研究。结果表明，100 mg L ^-1的 V(V) 可以通过生物和化学途径完全还原 (97.75%) 为四价钒 (V(IV))。嗜热杆菌和梭菌在一阶指数衰减模式中支配 V(V) 减少。葡萄糖和代谢物（挥发性脂肪酸和氢）均作为电子供体，与添加乙酸相比，添加葡萄糖对 V(V) 的降低有更好的促进作用。嗜热产氢细菌通过调节细胞内代谢和细胞外聚合物的分泌来增强 V(V) 的还原。细胞外 NADH、核黄素和细胞内谷胱甘肽 (GSH) 在 V(V) 减少中起重要作用。结果表明，嗜热产氢菌可用于较高温度下的V(V)还原，为V(V)生物还原技术的发展提供参考。

更新日期：2021-07-29

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