581 / 2018-11-10 21:04:14

Towards understanding the stabilization process in ver-micomposting of excess sludge under copper oxide nanoparticles stress using PARAFAC analysis of fluorescence spectra

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ABSTRACT
In this study, fluorescence excitation-emission matrix (EEM) combined with parallel factor analysis (PARAFAC) was employed to trace the behavior of dissolved organic matter during vermicomposting of excess sludge under four dosages (0, 400, 800, 1600 mg/kg-TSS) of copper oxide nanoparticles (CuO NPs) stress. Determination of dissolved organic carbon (DOC) and total content of organic carbon (TOC), available nitrogen and available phosphorous indicated the presence of CuO NPs decrease the sludge stabilization by vermicomposting, but the organics degradation efficiency were not significantly inhibited with the increase of CuO NPs concentration. Fluorescence spectra results of dissolved organic matter (DOM) during the four groups of ver-micompostings indicated CuO NPs led to the reduce of humic acid-like materials in vermicomposting. The positive relationship of protein-like component 1 and negative relationship of humic-like component 2 with CuO NPs concentrations in the substrates reflected by PARAFAC analysis suggested CuO NPs inhibit transformation of humic-like maters during the vermicomposting.
Key words: vermicomposting, copper oxide nanoparticles (CuO NPs), fluorescence excitation-emission matrix (EEM), dissolved organic matter (DOM), Parallel factor analysis (PARAFAC analysis)