State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2023 Jan;367:128273. doi: 10.1016/j.biortech.2022.128273. Epub 2022 Nov 5.
Short-chain fatty acids (SCFAs) recovery through anaerobic fermentation is a promising technology to achieve carbon-neutral in waste activated sludge (WAS) management. After 0.15 g CaO/g volatile suspended solids (VSS) addition and three-cycle freezing co-pretreatments, the maximal SCFAs production of 438.5 mg COD/g VSS was achieved within 4 days fermentation, and more than 70 % of SCFAs was composed of acetate and propionate, which achieved a higher level than reported in previous studies. Mechanism explorations elucidated that co-pretreatment triggered sludge solubilization, promoting the release of biodegradable organics, providing more biodegradable substrates for SCFAs generation. Further microbial community analysis indicated that the abundances of hydrolytic microorganisms and acidogens were enriched, whereas methanogens were inhibited. Besides, environmental analysis suggested that co-pretreatment could achieve carbon reduction benefits of 0.116-0.291 ton CO/ton WAS, demonstrating its huge carbon-neutral potential benefits.
通过厌氧发酵回收短链脂肪酸（SCFAs）是实现废活性污泥（WAS）管理碳中和的一项很有前途的技术。经过 0.15g CaO/g 挥发性悬浮固体（VSS）添加和三轮冷冻协同预处理后，在 4 天的发酵过程中实现了最大 438.5mg COD/g VSS 的 SCFAs 产量，超过 70%的 SCFAs 由乙酸和丙酸组成，这一水平高于之前的研究报告。机理探索表明，协同预处理引发了污泥的溶解，促进了可生物降解有机物的释放，为 SCFAs 的生成提供了更多可生物降解的底物。进一步的微生物群落分析表明，水解微生物和产酸菌的丰度增加，而产甲烷菌受到抑制。此外，环境分析表明，协同预处理可实现 0.116-0.291 吨 CO/吨 WAS 的碳减排效益，显示出其巨大的碳中和潜力效益。
