School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China.
Environ Sci Pollut Res Int. 2017 Mar;24(9):8629-8636. doi: 10.1007/s11356-017-8540-5. Epub 2017 Feb 14.
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.
堆肥是处理固体有机废物的一种有效方法，其中溶解有机物（DOM）在有机质转化和微生物活性中起着重要作用。因此，了解堆肥过程中 DOM 的特性和演变至关重要。在这项研究中，使用元素分析、光谱分析（UV-vis、FTIR 和热解 GC/MS）以及胶体分析，研究了 DOM 在 120 天堆肥过程中的特性和演变。结果表明，DOM 中的 N 和 O 含量随着堆肥时间的延长而逐渐增加，而 C 和 H 含量则逐渐减少。脂肪族 C-H 伸缩、酰胺基团的芳香族 C=C 或 C=O 伸缩以及 C-O 伸缩（碳水化合物）明显减少，而 COO-和 C-N 基团显著增加。DOM 的演变表明脂质和多糖组分逐渐减少，而芳香族和含氮化合物则增加。DOM 也呈现出更稳定的状态，随着堆肥的进行，小分子化合物的积累增加。总之，这些结果深入了解了堆肥过程中 DOM 的特性和演变。
