Wang Qingyan, Zhang Panyue, Bao Shuai, Liang Jinsong, Wu Yan, Chen Na, Wang Siqi, Cai Yajing
College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404632, China.
Bioresour Technol. 2020 Jun;306:123188. doi: 10.1016/j.biortech.2020.123188. Epub 2020 Mar 14.
This work studied the effect of total solid (TS) of sewage sludge on VFA production and composition in anaerobic fermentation. Results revealed that VFA concentration reached the highest of 10.16 g/L and the ratio of acetic acid, propionic acid and n-butyric acid was 5:2:2 with the 8% TS sewage sludge. In subsequent chain elongation with sludge fermentation liquid, n-caproic acid concentration reached 43.45 mmol/L. The microbial community analysis indicated that relative abundance of Clostridium_sensu_stricto_12 for n-caproic acid production was high (52.41%). The chain elongation with sludge fermentation liquid had more pathways to produce n-caproic acid, and the chain elongation reactions were thermodynamically possible. The mixed VFAs and high concentration of n-butyric acid benefitted n-caproic acid production. Carbon balance revealed that the VFA composition of sludge fermentation liquid was beneficial to the chain elongation. This study will contribute to wasted sludge minimization and high-value material production.
本研究考察了污水污泥总固体（TS）对厌氧发酵中挥发性脂肪酸（VFA）产生及组成的影响。结果表明，当污水污泥TS含量为8%时，VFA浓度达到最高值10.16 g/L，乙酸、丙酸和正丁酸的比例为5:2:2。在随后利用污泥发酵液进行的链延长过程中，己酸浓度达到43.45 mmol/L。微生物群落分析表明，产己酸的严格梭菌属12（Clostridium_sensu_stricto_12）的相对丰度较高（52.41%）。利用污泥发酵液进行链延长产生己酸的途径更多，且链延长反应在热力学上是可行的。混合VFA和高浓度正丁酸有利于己酸的产生。碳平衡表明，污泥发酵液的VFA组成有利于链延长。本研究将有助于实现污泥减量化和高价值物质的生产。
