Study on UV–Visible Spectra Characteristic of Dissolved Organic Matter during Municipal Solid Waste Composting
Study on UV–Visible Spectra Characteristic of Dissolved Organic Matter during Municipal Solid Waste Composting
复制标题
城市生活垃圾堆肥过程中溶解有机物的紫外-可见光谱特征研究
DOI：
10.4028/www.scientific.net/amr.878.840
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Dongyu Cui
中科院分区：
文献类型：
--
作者：
Dan Li;Xiaosong He;B. Xi;Zi;Hong;Dongyu Cui
研究了城市生活垃圾堆肥过程中有机质的变化规律。在为期46天的堆肥过程中，从上海松江生活垃圾生物处理厂收集了6个不同堆肥时间的样品。采用超纯水提取水中溶解性有机物（DOM），并对其紫外-可见光谱进行扫描研究。结果表明，在堆肥过程中，DOM中的非腐殖质物质逐渐转化为腐殖质物质，腐殖质物质的芳构化程度、分子量和腐殖化程度均有所提高。相关性分析表明，280 nm处的吸光度值（SUVA 280）与226~400 nm处的面积（A226~400）呈正相关。溶解有机碳（DOC）浓度与S275~295、SUVA 280和A200~226呈负相关，其中与A220~226的相关性最好（r=-0.976，P =0.001）。465和665 nm吸光度比值（E465/E665）与SUVA 280（r=-0.892，P =0.017）、A226~400（r=-0.909，P =0.012）和DOC（r=0.840，P=0.036）呈显著相关。250 ~ 365 nm吸光度比值（E250/E365）与DOC呈显著正相关（r=-0.880，P =0.021），与其他参数无相关性。275~ 295 nm范围内的吸收曲线斜率（S275~295）与DOC含量呈显著正相关（r=0.961，P=0.002）。其中A200~226、A226~400和S275~295最能反映堆肥腐熟度。
This paper aims to characterize the evolution of organic matter during the composting of municipal solid waste (MSW). During the 46-day composting process, six samples with different composting time were collected from Songjiang Solid Waste Biological Treatment Plant in Shanghai, China. Dissolved organic matter (DOM) was extracted by ultra-pure water, and the UV-Visible (UV-Vis) spectra of DOM were scanned and investigated. The results showed that, during the composting process, non-humus substances in DOM were gradually transformed into humus substances, the aromatization, molecular weight and humification of humus substances increased. Correlation analysis showed that the absorbance value at 280 nm (SUVA280), and the area of 226~400 nm (A226~400) correlated positively with each other. The dissolved organic carbon (DOC) concentration exhibited a negative correlation with the parameters S275~295, SUVA280 and A200~226, and the correlation coefficients between the DOC content and the A220~226 value was the best (r= -0.976, P=0.001). The absorbance ratio bewteen 465 and 665 nm (E465/E665) showed a significant correlation with SUVA280 (r=-0.892, P=0.017), A226~400 (r=-0.909, P=0.012) and DOC (r=0.840, P=0.036). The absorbance ratio of 250 to 365 nm (E250/E365) correlated significantly with DOC (r=-0.880, P=0.021), and showed no correlation with the other parameters. Absorption curve slope in the range of 275~295nm (S275~295) showed a significantly positive correlation with the DOC content (r=0.961, P=0.002). Among all parameters, the A200~226, A226~400 and S275~295 values reflected compost maturity best.