Effect of Earthworm Composting on Dissolved Organic Matter in Municipal Sludge Based on Spectra Analysis
LI Shasha
XU Qi
ZHANG Bixian
WANG Zhenxing
XU Yiqun
XU Jian
Abstract：The changes of dissolved organic matter (DOM) in the municipal sludge before and after earthworm composting are studied using dialysis,polarity analysis and spectra scanning.The results show that content of DOM in treated sludge below 300 D increases after vermicomposting,6.50％ higher than that in control sludge,but components above 8 000 D reduces by 56.25％.Meanwhile,the proportion of hydrophilic component in treated sludge is 50.76％ higher than that of control sludge.The spectrums analysis indicate the experimental sludges contain carboxylic acid,aromatic substance,etc.After vermicomposting,the contents of polysaccharide and aromatic compounds in DOM increase,with protein and molecular weight decreased.Fluorescence spectras show that the original sludge contains a large number of proteins and humus,produces tryptophan,tyrosine and other substances after 90 days' degradation,and humification of treated sludge is higher than that of control sludge.
Keywords：sludgevermicompostingdissolved organic matter (DOM)spectra analysis
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 71-76 )