温度对 Ca(OH)₂ 调节污泥堿性发酵中短链脂肪酸（SCFAs）积累和微生物转化的影响。
Effect of temperature on short chain fatty acids (SCFAs) accumulation and microbiological transformation in sludge alkaline fermentation with Ca(OH)₂ adjustment.
机构信息
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China; Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China.
出版信息
Water Res. 2014 Sep 15;61:34-45. doi: 10.1016/j.watres.2014.03.030. Epub 2014 Mar 22.
The effects of temperatures (15-55 °C) on the alkaline fermentation of sewage sludge were investigated in semi-continuous stirred tank reactors (semi - CSTR) at the pH of 10. The highest soluble chemical oxygen demand (SCOD) yield was obtained at 55 °C (764.2 mg/(gVS L d)), while the highest short chain fatty acids (SCFAs) yield was observed at 35 °C (319.8 mg/(gVS L d)), 1.5 times higher than SCFAs yield at 55 °C (209.5 mg/(gVS L d)). The proportion of the intercellular organic substances being transferred to the slime layer of sludge flocs increased from 29% at 15 °C to 54% at 55 °C. But only a small part of soluble organic substances in the slime layers was converted to SCFAs at 55 °C. The dewaterability of sludge was better at 35 °C than that at 55 °C. Microbiological community analysis showed the acid-producing microorganisms at the medium temperatures (25 °C and 35 °C) were more diverse and abundant than those at the low (15 °C) and high temperatures (55 °C). Clodtridium and Bacillus in Firmicutes and Gamma proteobacterium in Proteobacteria were the dominant functional bacterial species for high SCFA accumulation.
在 pH 值为 10 的半连续搅拌槽式反应器（半 CSTR）中研究了温度（15-55°C）对污水污泥碱性发酵的影响。在 55°C 时获得了最高的可溶性化学需氧量（SCOD）产率（764.2 mg/（gVS L d）），而在 35°C 时获得了最高的短链脂肪酸（SCFAs）产率（319.8 mg/（gVS L d）），是 55°C 时的 1.5 倍（209.5 mg/（gVS L d））。细胞间有机物质向污泥絮体的污泥层转移的比例从 15°C 的 29%增加到 55°C 的 54%。但是，只有一小部分可溶有机物质在 55°C 时转化为 SCFAs。污泥的脱水性能在 35°C 时优于 55°C。微生物群落分析表明，中温（25°C 和 35°C）下产酸微生物的多样性和丰度高于低温（15°C）和高温（55°C）下的产酸微生物。厚壁菌门中的 Clodtridium 和 Bacillus 以及变形菌门中的 Gamma proteobacterium 是高 SCFA 积累的主要功能细菌种类。
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