PMID- 34560433 OWN - NLM STAT- MEDLINE DCOM- 20211203 LR - 20211214 IS - 1873-2976 (Electronic) IS - 0960-8524 (Linking) VI - 342 DP - 2021 Dec TI - The relationship between the molecular composition of dissolved organic matter and bioavailability of digestate during anaerobic digestion process: Characteristics, transformation and the key molecular interval. PG - 125958 LID - S0960-8524(21)01300-6 [pii] LID - 10.1016/j.biortech.2021.125958 [doi] AB - In this study, swine wastewater (SW) and cow wastewater (CW) were used for anaerobic digestion (AD). We found the bioavailability of dissolved organic matter (DOM) was affected by the molecular weight ranges and molecular composition during the AD process. The organic substance in the small molecular range (0-5 kDa) accumulated due to a larger molecular fraction (>10 kDa) degradation, which enhanced the bioavailability of the DOM. Moreover, based on the excitation emission matrix-parallel factor (EEM-PARAFAC) analysis, the protein-like component in 0-5 kDa molecular size and humic-like component over 5 kDa are significantly positively correlated with DOM bioavailability. This study indicated that increasing the hydrolysis of larger organic matter and humification degree of molecular weights>5 kDa are critical solutions to improving the bioavailability of DOM. These conclusions can help explain the molecular mechanisms of DOM transformation and the AD process of livestock wastewater. CI - Copyright (c) 2021 Elsevier Ltd. All rights reserved. FAU - Du, Xian AU - Du X AD - Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, PR China. FAU - Gu, Li-Peng AU - Gu LP AD - Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, PR China. FAU - Wang, Ting-Ting AU - Wang TT AD - Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, PR China. FAU - Kou, Hui-Juan AU - Kou HJ AD - Ulanqab animal husbandry station of Inner Mongolia Autonomous Region, Inner Mongolia 012000, PR China. FAU - Sun, Ying AU - Sun Y AD - Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, PR China. Electronic address: sunying@cau.edu.cn. LA - eng PT - Journal Article DEP - 20210920 PL - England TA - Bioresour Technol JT - Bioresource technology JID - 9889523 RN - 0 (Humic Substances) SB - IM MH - Anaerobiosis MH - Animals MH - Biological Availability MH - Factor Analysis, Statistical MH - *Humic Substances/analysis MH - Spectrometry, Fluorescence MH - Swine OTO - NOTNLM OT - Anaerobic digestion OT - Bioavailability OT - Dissolved organic matter OT - Livestock wastewater OT - Molecular weight EDAT- 2021/09/25 06:00 MHDA- 2021/12/15 06:00 CRDT- 2021/09/24 20:26 PHST- 2021/08/18 00:00 [received] PHST- 2021/09/12 00:00 [revised] PHST- 2021/09/13 00:00 [accepted] PHST- 2021/09/25 06:00 [pubmed] PHST- 2021/12/15 06:00 [medline] PHST- 2021/09/24 20:26 [entrez] AID - S0960-8524(21)01300-6 [pii] AID - 10.1016/j.biortech.2021.125958 [doi] PST - ppublish SO - Bioresour Technol. 2021 Dec;342:125958. doi: 10.1016/j.biortech.2021.125958. Epub 2021 Sep 20.