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Response of methanogens in calcified anaerobic granular sludge: Effect of different calcium levels.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.jhazmat.2020.122131 Linlin Chen 1 , Hui Chen 2 , Donghui Lu 1 , Xiangyang Xu 3 , Liang Zhu 3
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.jhazmat.2020.122131 Linlin Chen 1 , Hui Chen 2 , Donghui Lu 1 , Xiangyang Xu 3 , Liang Zhu 3
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Inhibition of high calcium during anaerobic wastewater treatment has been studied in recent years, focusing on calcium precipitates in anaerobic granule but neglecting the effect of functional microbes. In this study, key factors of calcification and microbial behaviors especially methanogens of calcified anaerobic granule (AnGS) were investigated in batch assays with calcium level varying from 0 to 5 g L-1. The results showed that the COD removal efficiency and specific methane activity of calcified AnGS were restrained with calcium addition, especially high calcium (>2 g L-1), and little tolerance of calcified AnGS to Ca2+ was underlined compared with non-calcified AnGS. Analysis of calcium mass flow from solution to sludge validated the formation of calcium precipitates influenced by calcium concentration, pH and HCO3-. Besides, death of microbes in outer layer of anaerobic granules was triggered by calcium precipitation. Most importantly, aceticlastic Methanothrix genus was the dominant methanogen, and its relative abundance was correlative negatively with cumulative decrease of bulk Ca2+. Hydrogenotrophic Methanobacterium was enriched at higher calcium level, and it suggested that hydrogenotrophic methanogenesis could play a role in alleviating the inhibition of high calcium.
中文翻译：
钙化厌氧颗粒污泥中产甲烷菌的响应：不同钙水平的影响。
近年来，研究了在厌氧废水处理过程中抑制高钙的方法，其重点是厌氧颗粒中的钙沉淀物，但忽略了功能性微生物的作用。在这项研究中，钙化和微生物行为的关键因素，尤其是钙化厌氧颗粒（AnGS）的产甲烷菌，在钙含量从0到5 g L-1不等的分批测定中进行了研究。结果表明，钙的加入会抑制钙化AnGS的COD去除效率和比甲烷活性，特别是高钙（> 2 g L-1），与非钙化AnGS相比，钙化AnGS对Ca2 +的耐受性较低。对从溶液到污泥的钙质量流量的分析验证了钙浓度，pH和HCO3-的影响下钙沉淀的形成。除了，钙沉淀触发了厌氧颗粒外层微生物的死亡。最重要的是，醋酸弹状甲烷菌属是占主导地位的产甲烷菌，其相对丰度与大量Ca2 +的累积减少呈负相关。氢营养型甲烷菌在较高的钙水平下富集，这表明氢营养型甲烷生成可在减轻高钙抑制中发挥作用。
更新日期：2020-01-17
中文翻译：
钙化厌氧颗粒污泥中产甲烷菌的响应：不同钙水平的影响。
近年来，研究了在厌氧废水处理过程中抑制高钙的方法，其重点是厌氧颗粒中的钙沉淀物，但忽略了功能性微生物的作用。在这项研究中，钙化和微生物行为的关键因素，尤其是钙化厌氧颗粒（AnGS）的产甲烷菌，在钙含量从0到5 g L-1不等的分批测定中进行了研究。结果表明，钙的加入会抑制钙化AnGS的COD去除效率和比甲烷活性，特别是高钙（> 2 g L-1），与非钙化AnGS相比，钙化AnGS对Ca2 +的耐受性较低。对从溶液到污泥的钙质量流量的分析验证了钙浓度，pH和HCO3-的影响下钙沉淀的形成。除了，钙沉淀触发了厌氧颗粒外层微生物的死亡。最重要的是，醋酸弹状甲烷菌属是占主导地位的产甲烷菌，其相对丰度与大量Ca2 +的累积减少呈负相关。氢营养型甲烷菌在较高的钙水平下富集，这表明氢营养型甲烷生成可在减轻高钙抑制中发挥作用。
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