The spectroscopic changes characterizations of dissolved organic matter during composting sludge
污泥堆肥过程中水溶性有机物光谱学变化特征

The spectroscopic changes of DOM were investigated in FT\|IR, fluorescence and ultraviolet\|visible spectra. The FT\|IR and ultraviolet\|visible spectra showed that during composting, the contents of amide and polysaccharide materials in DOM decrease and the contents of carboxyl and aromatics in DOM increase. The changes in fluorescing characteristics of DOM with composting time can be explained by the increasing polycondensation and conjugation of the unsaturated structures and the greater uniformity of fluorophores. The formed humic substances more resemble soil fulvic acids.