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Co-composting solid biowastes with alkaline materials to enhance carbon stabilization and revegetation potential

Abstract : Co-composting biowastes such as manures and biosolids can be used to stabilize carbon (C) without impacting the quality of these biowastes. This study investigated the effect of co-composting biowastes with alkaline materials on C stabilization and monitored the fertilization and revegetation values of these co-composts. The stabilization of C in biowastes (poultry manure and biosolids) was examined by their composting in the presence of various alkaline amendments (lime, fluidized bed boiler ash, flue gas desulphurization gypsum, and red mud) for 6 months in a controlled environment. The effects of co-composting on the biowastes' properties were assessed for different physical C fractions, microbial biomass C, priming effect, potentially mineralizable nitrogen, bioavailable phosphorus, and revegetation of an urban landfill soil. Co-composting biowastes with alkaline materials increased C stabilization, attributed to interaction with alkaline materials, thereby protecting it from microbial decomposition. The co-composted biowastes also increased the fertility of the landfill soil, thereby enhancing its revegetation potential. Stabilization of biowastes using alkaline materials through co-composting maintains their fertilization value in terms of improving plant growth. The co-composted biowastes also contribute to long-term soil C sequestration and reduction of bioavailability of heavy metals.
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Saikat Chowdhury, Nanthi S. Bolan, Balaji Seshadri, Anitha Kunhikrishnan, Hasintha Wijesekara, et al.. Co-composting solid biowastes with alkaline materials to enhance carbon stabilization and revegetation potential. Meeting on Biological Waste as Resource-with a Focus on Food Waste, Consortium on Health, Environment, Education & Research (CHEER). Hong-Kong, CHN., Dec 2014, Hong Kong, China. pp.12, ⟨10.1007/s11356-015-5411-9⟩. ⟨hal-02743272⟩



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