Tracking the composition and transformation of humic and fulvic acids during vermicomposting of sewage sludge by elemental analysis and fluorescence excitation-emission matrix

Waste Management
Jie ZhangJian Yang

Abstract

Sewage sludge (T1) and the mixture of sewage sludge and cattle dung (T2) 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 T1 was increased significantly, and only slight increasing was observed in treatment T2. 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.

References

May 16, 2006·Chemosphere·Fabrizio AdaniEnzo Montoneri
Oct 24, 2007·Journal of Hazardous Materials·Renuka Gupta, V K Garg
Mar 4, 2008·The Science of the Total Environment·Surindra Suthar, Sushma Singh
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Citations

Sep 25, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wenlin ZhaoFeng Jiang
Mar 30, 2018·Environmental Science and Pollution Research International·Imran RashidMuhammad Farooq
Jul 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Wenjie SuiMin Zhang
Aug 3, 2021·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Feng WangWeiqin Zhu

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