4.8 Article

Co-composting of food waste and swine manure augmenting biochar and salts: Nutrient dynamics, gaseous emissions and microbial activity

Journal

BIORESOURCE TECHNOLOGY
Volume 344, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126300

Keywords

Biochar; Composting; Food waste; Nitrogen conservation; Swine manure

Funding

  1. National Research Foundation of Korea(NRF) - Korea Government (MSIT) [2020R1G1A1012069]

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The addition of biochar has a positive impact on microbial activity and compost quality in the composting process. It improves the degradation rates, reduces emissions and pathogens. A 6% biochar amendment is recommended for obtaining mature compost.
The prominent characteristics of the biochar, high porosity, sorption capacity with low density improve the aeration, making it a desirable amendment material for composting process. The composting efficiency was analysed by the impact of rice husk biochar amendment (0, 2, 4, 6, 8 and 10%) in the presence of salts for the co-composting of food waste and swine manure, in composting reactors for 50 days. Results revealed that biochar amendment had improved the degradation rates by microbial activities in comparison with control. The final compost quality was improved by reducing the bulk density (29-53%), C/N ratio (29-57%), gaseous emissions (CO2, CH4, and NH3) and microbial pathogens (Escherichia coli and Salmonella sp.). However, 6% biochar amendment had significant improvement in compost quality, degradation rates and nutritional value which is recommended as the ideal ratio for obtaining mature compost from the feedstock, food waste and swine manure.

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