State Key Laboratory of Petroleum Pollution Control, Beijing Key Laboratory of Oil and Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China.
State Key Laboratory of Petroleum Pollution Control, CNPC Research Institute of Safety and Environmental Technology, Beijing 102200, China.
Bioresour Technol. 2023 Aug;381:129122. doi: 10.1016/j.biortech.2023.129122. Epub 2023 May 2.
This study compared the effects of alkaline, thermal, thermal-peroxymonosulfate (PMS), and alkyl polyglucose (APG) pretreatments on volatile fatty acids (VFAs) production from refinery waste activated sludge (RWAS), including VFAs yield, composition, organics components, microbial communities, and the potential improvement of mechanisms. All pretreatments effectively enhanced the bioconversion of RWAS and consequently promoted the hydrolysis process, which inhibited the methanogenesis process. However, the release of lignin/carboxyl-rich alicyclic molecules (CRAM)-like compounds and tannin substances in Thermal-PMS and APG groups significantly influenced the acidogenesis and acetogenesis processes. Among all pretreatments, alkaline pretreatment showed the highest VFAs yield of 95.06 mg/g volatile solids (VS) and VS removal of 17%. This result could be associated with the enrichment of functional hydrolytic-acidification bacteria, such as Planococcus and Soehngenia, and increased metabolism of amino acids, carbohydrates, and nucleotides. By considering an economical and efficient perspective, this study recommended the alkaline pretreatment for the anaerobic fermentation of RWAS.
本研究比较了碱性、热、热过一硫酸盐（PMS）和烷基多糖苷（APG）预处理对炼油厂剩余活性污泥（RWAS）中挥发性脂肪酸（VFAs）生成的影响，包括 VFAs 产量、组成、有机物成分、微生物群落，以及潜在的机制改善。所有预处理均能有效增强 RWAS 的生物转化，从而促进水解过程，抑制产甲烷过程。然而，热-PMS 和 APG 组中木质素/羧酸丰富的脂环族分子（CRAM）样化合物和单宁物质的释放，显著影响了产酸和产乙酸过程。在所有预处理中，碱性预处理表现出最高的 VFAs 产量，为 95.06mg/g 挥发性固体（VS）和 17%的 VS 去除率。这一结果可能与功能水解酸化细菌（如 Planococcus 和 Soehngenia）的富集以及氨基酸、碳水化合物和核苷酸代谢的增加有关。从经济和高效的角度考虑，本研究推荐碱性预处理用于 RWAS 的厌氧发酵。
