Abstract
Composting is an efficient and cost-effective technology for sewage sludge treatment, and bulking agents are essential in sewage sludge composting. In this study, perlite was chosen as inorganic bulking agent to partially substitute for the organic bulking agent. Variations in the temperature, bulk density, moisture content, pH, electrical conductivity, organic carbon, nitrogen, phosphorus and potassium were detected during sewage sludge composting. The treatment with a mass ratio of spent mushroom substrate to perlite at 3:1 exhibited the highest pile temperature and the best effect on reducing bulk density and moisture content. In addition, Fourier transform infrared spectra showed that perlite promotes the degradation of organic matter during the composting process, and the germination index showed that the compost from all treatments was safe for agricultural application. When the mass ratios of spent mushroom substrate and perlite at 3:1 and 2:2 were chosen as bulking agents, the sewage sludge compost product could be used to produce plant cultivation substrate, and economic benefits could be obtained from sewage sludge composting according to comprehensive cost analysis.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2018YFD0800601) and the National Natural Science Foundation of China (41371455). Gratitude is extended to all for supporting our work during the study.
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Wang, X., Chen, T. & Zheng, G. Perlite as the partial substitute for organic bulking agent during sewage sludge composting. Environ Geochem Health 42, 1517–1529 (2020). https://doi.org/10.1007/s10653-019-00353-z
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DOI: https://doi.org/10.1007/s10653-019-00353-z