title: Properties and evolution of dissolved organic matter during co-composting of dairy manure and Chinese herbal residues.
abstract: Composting is an effective method in treating solid organic wastes, in which dissolved organic matter (DOM) plays an important role in transformation of organic matter and microbial activity. Therefore, an understanding of the properties and evolution of DOM during composting is crucial. In this study, DOM was studied using elemental analysis, spectroscopic analysis (UV-vis, FTIR, and pyrolysis-GC/MS), and colloidal analysis during a 120-day composting. Results showed that the content of N and O in DOM increased while C and H content declined progressively over the composting time. Aliphatic C-H stretching, aromatic C=C or C=O stretching of amide groups, and C-O stretch (carbohydrates) showed an obvious decrease, while COO- and C-N groups had a significant increase. The evolution of DOM indicated a gradual decrease of the lipid and polysaccharide fractions, whereas an increase of aromatic and nitrogenous compounds was observed. The DOM also showed a more stable status, and an accumulation of small molecular compounds occurred with composting proceeded. Taken together, these results shed a good insight into the properties and evolution of DOM during a composting process.
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China. liqunliang231@163.com.
authors.forename: Qunliang
authors.initials: Q
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China.
authors.forename: Yanyu
authors.initials: Y
authors.lastname: Lu
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Guo
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China.
authors.forename: Guangchun
authors.initials: G
authors.lastname: Shan
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China.
authors.forename: Junhao
authors.initials: J
authors.lastname: Huang
mesh_terms: D000818:Animals; D002417:Cattle; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D008372:Manure; D012987:Soil / Q000737:chemistry*; D062611:Solid Waste; D013057:Spectrum Analysis
chemical_list: D004365:Drugs, Chinese Herbal; D008372:Manure; D012987:Soil; D062611:Solid Waste
keywords: Colloidal analysis; Composting; Dissolved organic matter; Elemental analysis; Spectroscopic analysis