Pyrolysis is an option for enhancing the sustainable management of broiler manure surpluses by producing a concentrated,hygienic char product with a fertilizer and soil conditioner value.In this study,the impacts of p...Pyrolysis is an option for enhancing the sustainable management of broiler manure surpluses by producing a concentrated,hygienic char product with a fertilizer and soil conditioner value.In this study,the impacts of pyrolysis conducted at 350,400 and 450℃ on total nutrient and harmful element concentrations in biochars derived from peat-bedded broiler manure were examined.Emphasis was placed on the availability of phosphorus(P).In addition,the pore structures of these biochars were explored using X-ray microtomography and image analysis.During pyrolysis,35-50%,40-55%and 35-45%of the original carbon,nitrogen and sulfur contents,respectively,of the feedstock biomass were lost as volatiles.Mineral elements,including P,were concentrated in the biochar.Although water-extractable P was found to be converted to less labile forms due to charring,the concentration effect and notable increase in sodium bicarbonate-extractable P rendered broiler manure biochars richer in total labile P in comparison with feedstock manure(7.1,10.0,11.1 and 14.8 g labile P kg^(−1)in feedstock and biochars produced at 350,400 and 450℃,respectively).The pore volume of the micrometer-scale porosity of the broiler manure biochar was comparable to that found earlier in wood-based biochars.In comparison with wood-based biochars,the pore structure of broiler manure biochars was more versatile,and the pore size distribution was wider.Consequently,part of the porosity was too large to store plant-available water,which may reduce the potential of broiler manure biochars to improve soil water storage capacity.展开更多
基金This work was supported by the Nutrient Recycling Pilot Programme coordinated by the Centre for Economic Development,Transport and the Environment,Finland.Hanna Help was supported by the Academy of Finland(Grant 1295696).
文摘Pyrolysis is an option for enhancing the sustainable management of broiler manure surpluses by producing a concentrated,hygienic char product with a fertilizer and soil conditioner value.In this study,the impacts of pyrolysis conducted at 350,400 and 450℃ on total nutrient and harmful element concentrations in biochars derived from peat-bedded broiler manure were examined.Emphasis was placed on the availability of phosphorus(P).In addition,the pore structures of these biochars were explored using X-ray microtomography and image analysis.During pyrolysis,35-50%,40-55%and 35-45%of the original carbon,nitrogen and sulfur contents,respectively,of the feedstock biomass were lost as volatiles.Mineral elements,including P,were concentrated in the biochar.Although water-extractable P was found to be converted to less labile forms due to charring,the concentration effect and notable increase in sodium bicarbonate-extractable P rendered broiler manure biochars richer in total labile P in comparison with feedstock manure(7.1,10.0,11.1 and 14.8 g labile P kg^(−1)in feedstock and biochars produced at 350,400 and 450℃,respectively).The pore volume of the micrometer-scale porosity of the broiler manure biochar was comparable to that found earlier in wood-based biochars.In comparison with wood-based biochars,the pore structure of broiler manure biochars was more versatile,and the pore size distribution was wider.Consequently,part of the porosity was too large to store plant-available water,which may reduce the potential of broiler manure biochars to improve soil water storage capacity.
