文献类型：期刊文献

英文题名：New Understanding of Microbial Growth Cycle for Efficient Waste-Activated Sludge Disposal by Preserving Microbial Self-Degradation Activity During the Decline Phase

作者：Li, Xiqi[1,2]; Liu, Wenzong[1,2]; Yu, Zhe[2]; Wang, Hualin[3]; Wang, Aijie[1,2]; Ren, Nanqi[1,2]

机构：[1] State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150001, China; [2] State Key Laboratory of Urban Water Resource and Environment, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, China; [3] National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240115257)

语种：英文

外文关键词：Bacteria - Biodegradation - Biogeochemistry - Fermentation - Sludge disposal - Volatile fatty acids

摘要：This study explored the feasibility of utilizing the growth cycle of sludge mixed microbes to enhance the production of volatile fatty acids (VFAs) from another perspective. Diverse pretreatment methods have been developed for cell-cracking and sludge denaturation to harvest pretreated sludge as the suitable fermentation substrate. However, new inoculation is not always working quickly or adaptively for the pretreated sludge. This study established self-degradation microorganism preservation (SDMP) pretreatment by integrating rhamnolipid (RL) and high-speed hydrocyclone (HSHC) treatment. We fully used the enriched bacteria with decomposing enzymes/abilities for dead cell lysis and sludge destruction at the decline phase of microbial growth cycle (MGC). The SDMP pretreatment released organic matter in the extracellular polymeric substances (EPS) and improved the microbial activity and the activity of hydrolytic acidification enzymes by sludge self-degradation microorganism’s succession. The preservation of sludge self-degradation activity shortened fermentation cycle by 36.25% than alkaline pretreated sludge. VFAs yield reached 4482.19 mgCOD/L in 3 days, with organic matter bioconversion rate of 369.36 mgCOD/gVSS. Finally, the preserved sludge self-degradation microorganisms and their positive role in VFAs production were identified and disclosed by microbial analysis. ? 2024, The Authors. All rights reserved.