Effect of tertiary-amine bentonite on carbon transformation and global warming potential during chicken manure composting

Abstract Aiming to provide a highly-valuable green fertilizer, the effects of tertiary-amine bentonite on the carbon transformation and global warming potential were investigated during composting. TAB in weight ratios of 0%, 2%, 4%, 6%, 8% and 10% was mixed with CM and WS and composted for 50 days, respectively. The results showed that adding TAB promoted the degradation of TOC and DOC. With an increase in TAB amounts, HA content and polymerization were elevated by 11.71–27.08% and 3.40–47.00%, which was also supported by investigation of spectral parameters including SUVA254, SUVA280, A4/A1, and A363-500. TAB benefited the CO2 emission while reducing the volatilization of CH4 and N2O, and the lowest global warming potential value was 108.99 in the 10% TAB treatment. TAB is considered as an economic amendment for improving CM composting process and quality in suggested amounts of 4% - 10% based on humic-substance variations, spectral profiles of DOC, and global warming potential as well as the natural characterizations of TAB,