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Composting of swine production chain wastes with addition of crude glycerin: organic matter degradation kinetics, functional groups, and carboxylic acids

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Abstract

Little is known about the effect of adding crude glycerin (CG) as a carbon source during the composting of agro-industrial residues, such as those generated in the swine production chain, especially concerning the impact on organic matter humification. Therefore, the aim of this work was to study the effect of adding crude glycerin during the composting of organic swine waste, using appropriate analyses to determine the degree of maturation of the organic material. The experiment was performed using composters constructed from pallets. The variables considered were temperature, mass, volume, organic matter, functional groups, carboxylic acids, pH, electrical conductivity, total organic carbon, total Kjeldahl nitrogen, total phosphorus, potassium, basal respiration, and germination index. For all the CG concentrations tested, thermophilic temperatures were reached, while higher amounts of CG (4.5 and 6.0%) maintained temperatures above 55 °C for longer periods (28 days). Fourier transform infrared spectroscopy analysis showed the presence of an aromatic stretching vibration signal at 1620 cm−1, confirming mineralization of the organic matter, while the decrease of carboxylic acids at the end of the composting period indicated stabilization. The organic composts presented high nutrient contents and absence of toxicity, indicating that they could be safely used in agriculture.

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All data generated or analyzed during this study are included in this published article.

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Funding

This work was carried out with the support of the Coordination of Improvement of Higher Education Personnel—Brazil (CAPES)—Financing Code 001.

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FTDS: presented the idea of the work; proposed the methodology; collected, analyzed, and interpreted the data obtained; and was one of the main contributors in the writing of the manuscript. CF: collected, analyzed, and interpreted the data obtained. CMA: collected, analyzed, and interpreted the data obtained. IRB: obtained the necessary resources for the execution of the research, supervised the project, interpreted the data obtained, and was one of the main contributors in the writing of the manuscript. EH: obtained the necessary resources to carry out the research, supervised the project, interpreted the data obtained, and was one of the main contributors in the writing of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Eliane Hermes.

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The authors declare no competing interests.

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Responsible Editor: Ta Yeong Wu

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Santos, F.T.D., Fehmberger, C., Aloisio, C.M. et al. Composting of swine production chain wastes with addition of crude glycerin: organic matter degradation kinetics, functional groups, and carboxylic acids. Environ Sci Pollut Res 28, 50542–50553 (2021). https://doi.org/10.1007/s11356-021-14063-6

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  • DOI: https://doi.org/10.1007/s11356-021-14063-6

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