Journal
WASTE MANAGEMENT
Volume 39, Issue -, Pages 111-118Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2015.02.010
Keywords
Vermicomposting; Sewage sludge; Humic acid; Fulvic acid; Excitation-emission matrix (EEM); Fluorescence regional integration (FRI)
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Funding
- Fundamental Research Funds for the Central Universities [0400219187]
- National Natural Science Foundation of China [51109161]
- PhD Programs Foundation of Ministry of Education of China [20110072120029]
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Sewage sludge (T-1) and the mixture of sewage sludge and cattle dung (T-2) were vermicomposted with Eisenia fetida, respectively. The transformation of humic acid (HA) and fulvic acid (FA) extracted from these two treatments were evaluated by a Series of chemical and spectroscopic methods. Results indicated that the vermicomposting decreased pH, TOC, and C/N ratio, and increased EC, total extractable C, and HA contents. The FA content in treatment T-1 was increased significantly, and only slight increasing was observed in treatment T-2. Moreover, vermicomposting decreased H content, C/N ratio, proteinaceous and carbohydrates components, and increased the N content, C/H ratio, aromatic compounds and polycondensation structures in HA and FA. In addition, fluorescence spectra and fluorescence regional integration indicated that protein-like groups were degraded and HA compounds were formed. Furthermore, the addition of cattle dung enhanced the humification process and improved the HA quality in spite of no significant effect on the FA. (c) 2015 Elsevier Ltd. All rights reserved.
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