Molecular diversity of liquid digestate from anaerobic digestion plants for biogenic waste

• Published in: Bioresource technology 2022-03, Vol.347, p.126373-126373, Article 126373
• Main Authors: He, Pinjing, Huang, Yulong, Qiu, Junjie, Zhang, Hua, Shao, Liming, Lü, Fan
• Format: Article
• Language: English
• Subjects: Anaerobiosis; Biowaste; Food; Food waste; Non-target; Plant hormones; Refuse Disposal; Xenobiotic compounds
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2021.126373

[Display omitted] •ADLD from dry and wet AD processes had regular differences in DOM indicators.•The effect of the process factor was more significant than the food waste type.•sCOD and pH were the drivers of molecular distribution of ADLD common compounds.•Compounds relating to plant hormones, nutrients and xenobiotics were identified. The treatment and valorization of liquid digestate (ADLD) after anaerobic digestion of biogenic waste are challenging. This study used ultra-high resolution mass spectrometry to determine the molecular characteristics of ADLD collected from different full-scale plants for food waste treatment. The results indicated that there were regular differences in the dissolved organic matter (DOM) indicators among the samples from dry and wet anaerobic processes. ADLD DOM had higher H/C and O/C, and contained more easily degradable proteins. In addition, sCOD and pH were the drivers of the molecular distribution of ADLD common compounds. The same common compounds were present in the ADLD from different anaerobic digestion plants. They had a significant correlation with physicochemical characteristics. The compounds relating to plant hormones and nutrients as well as xenobiotics were both identified, suggesting that comprehensive considerations should be taken into account for the land application of ADLD.