Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 845, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.157174
Keywords
Electrolytic oxygen aerobic composting; Dissolved organic matter; Humi fication; Spectroscopy; Fourier transform ion cyclotron resonance mass; spectrometry
Categories
Funding
- National Natural Science Foundation of China [41977094, U21A20295]
- National Key Research and Development Program of China [2021YFC1910403]
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Electrolytic oxygen aerobic composting (EOAC) effectively treats organic solid waste by using in-situ electrolytic oxygen for aeration. Our study comprehensively characterizes dissolved organic matter (DOM) transformation closely related to compost maturity during EOAC, revealing the mechanism of accelerated compost humification and the presence of more aromatic compounds.
Electrolytic oxygen aerobic composting (EOAC) effectively treats organic solid waste by using in-situ electrolytic oxygen for aeration. However, the fundamental mechanism of compost maturity is still unclear. Therefore, we comprehensively characterized dissolved organic matter (DOM) transformation closely related to compost maturity during EOAC. Excitation-emission matrix-parallel factor (EEM-PARAFAC) and Fourier transform infrared (FTIR) analysis confirmed that EOAC quickly decreased organic matter and increased humus substances, accelerating the compost humification process compared with conventional aerobic composting. Electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) analysis reveals that the double bound equivalent and aromaticity index during EOAC are higher than in conventional aerobic composting (CAC), suggesting more aromatic compounds in EOAC. DOM's detailed transformation investigation suggested that low O/C and high H/C compounds were preferentially decomposed during EOAC. Our investigation firstly extends the in-depth molecular mechanisms of humification during EOAC, and reveals its practical engineering applications.
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