Risk Evaluation of Pyrolyzed Biochar from Multiple Wastes

Table 6

GHG abatement potential and effect of biochar amendment.

Feedstock	Pyrolysis temp (°C)	GHGs	Effect	Reference
Wheat straw	350–550	CH4, CO2, N2O	Maize yield was increased.; Increased crop productivity, soil properties.; N2O emission was decreased.; Biochar increased the total CO2 emission.; Increased CH4.Total GWP of CH4 and N2O decreased.	[29, 191]
Maize straw	400–450	CO2	Insignificant CO2 emissions; Lowered CO2 emissions and higher dry matter.	[42]
Rice straw	500	N2O	Increased N2O without char.; N2O reduction via denitrification with char.; Reduced mineral N with and without biochar.	[185]
Biosolids	—	CH4, N2O	Decreased N2O by 84% but increased CO2 emission.; Changed soil pH and increased soil aeration.	[192]
Oil mallee, wheat chaff and poultry litter	550	N2O	Oil mallee biochar reduced more N2O. Insignificant reduction of N2O in poultry litter biochar.; Biochars reduced overall N2O emissions in Tenosol.	[48]
Bamboo	600	N2O	Biochar lowered NO^2−-N concentrations; Lowered total N2O from pig manure compost.; Less N2O producing and more N2O-consuming bacteria present.	[193]
Rice straw and bamboo	600	CH4	Rice straw char more efficient in reducing CH4 emission than bamboo char.; Rice straw char decrease CH4 emission by 47.30%–86.43%.; Decreased methanogenic activity with rice straw char. Rice yield increased.	[31]

GWP–global warming potential.