PMID- 35032558 OWN - NLM STAT- MEDLINE DCOM- 20220216 LR - 20220216 IS - 1873-2976 (Electronic) IS - 0960-8524 (Linking) VI - 347 DP - 2022 Mar TI - Medium-chain carboxylates production by co-fermentation of sewage sludge and macroalgae. PG - 126718 LID - S0960-8524(22)00047-5 [pii] LID - 10.1016/j.biortech.2022.126718 [doi] AB - The co-fermentation of sewage sludge and macroalgae at different mixing ratios was performed for medium-chain carboxylates (MCCs) production. The results showed that MCCs production was enhanced in co-fermentation groups due to the abundant readily available organics supplied by macroalgae and the alkaline buffer capacity provided by sewage sludge. Highest MCCs concentration of 112.7 mmol C/L (25.5 mmol C/g VS(added)) was obtained in the co-fermentation group with sludge/macroalgae ratio of 4:6, which was higher than MCCs produced from the mono-fermentation of sewage sludge (41.7 mmol C/L, 9.4 mmol C/g VS(added)) or macroalgae (79.9 mmol C/L, 18.1 mmol C/g VS(added)). Microbial analysis showed that species from genus Romboutsia, Terrisporobacter, Clostridium_sensu_stricto_12, Paraclostridium, unclassified_f_Peptostreptococcaceae and Caproiciproducens were significantly positively correlated with MCCs production. Metabolic pathways analysis demonstrated that the co-fermentation promoted the chain elongation process by stimulating the rate-limiting steps involved in the conversion of ethanol to Acetyl-CoA and circular fatty acid biosynthesis pathway. CI - Copyright (c) 2022 Elsevier Ltd. All rights reserved. FAU - Yin, Yanan AU - Yin Y AD - Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China. FAU - Wang, Jianlong AU - Wang J AD - Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of Radioactive Waste Treatment, INET, Tsinghua University, Beijing 100084, PR China. Electronic address: wangjl@tsinghua.edu.cn. LA - eng PT - Journal Article DEP - 20220112 PL - England TA - Bioresour Technol JT - Bioresource technology JID - 9889523 RN - 0 (Carboxylic Acids) RN - 0 (Fatty Acids, Volatile) RN - 0 (Sewage) SB - IM MH - Bioreactors MH - Carboxylic Acids MH - Fatty Acids, Volatile MH - Fermentation MH - Hydrogen-Ion Concentration MH - *Seaweed MH - *Sewage OTO - NOTNLM OT - Chain elongation OT - Co-fermentation OT - Medium-chain carboxylates OT - Sewage sludge, macroalgae EDAT- 2022/01/16 06:00 MHDA- 2022/02/17 06:00 CRDT- 2022/01/15 20:11 PHST- 2021/12/20 00:00 [received] PHST- 2022/01/08 00:00 [revised] PHST- 2022/01/10 00:00 [accepted] PHST- 2022/01/16 06:00 [pubmed] PHST- 2022/02/17 06:00 [medline] PHST- 2022/01/15 20:11 [entrez] AID - S0960-8524(22)00047-5 [pii] AID - 10.1016/j.biortech.2022.126718 [doi] PST - ppublish SO - Bioresour Technol. 2022 Mar;347:126718. doi: 10.1016/j.biortech.2022.126718. Epub 2022 Jan 12.