Spectroscopy methods such as three-dimensional excitation-emission (3D-EEM) fluorescence spectroscopy were applied to analyze the structures and changes of DOM in hyperthermophilic composting of sewage sludge to fully understand the advantages of hyperthermophilic composting in promoting sludge maturity. The results showed that the temperature reached its peak value at 90℃ and remained over 80℃ for 5 d. The thermophilic period more than 50℃ lasted for 22 d.
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