Abstract
AbstractBACKGROUND: Manure is the main waste of raising livestock, when spreading in soils can cause surface and ground water pollution. The management of manure is associated with emissions of greenhouse gases and odours. Dry manure contains at least 45% of carbon. This is an attractive characteristic for energetic valorisation. To use manure in the production of energy, it must be previously dried.RESULTS: Wet solids from swine manure containing 30% of dry matter were dried in laboratory scale biodryers. Four levels of aeration rate from 0.4 to 4 L min−1 kg$^{-1}_{\rm {DM}}$ and five levels of temperature from 25 to 65 °C were tested. The highest emissions of CO2, NH3 and N2O occurred at the highest air flow rate of 4 L min−1 kg$^{-1}_{\rm {DM}}$. For all operating conditions, the high calorific power had a mean value of 15 ± 0.4 MJ kg$^{-1}_{\rm {DM}}$. The dried biomass obtained had an energetic potential to valorise by combustion.CONCLUSION: The bed temperature and aeration rate have an effect on carbon and nitrogen bio‐cycles. These operating parameters can also control the release quantity and gaseous form of nitrogen. Several problems related to swine manure management can be solved by using biodrying, an economic and environmental friendly technology. Copyright © 2012 Society of Chemical Industry
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