Assessment of the potential reduction of greenhouse gas emission through increased use of rice hulls for mechanical dryers in Nueva Ecija, Philippines
2014
Salvador, A.R.
This study was conducted to assess the environmental and economic gains associated with the use of rice hull as heat source for grain drying in Nueva Ecija. It also evaluated the greenhouse gas emission from the different uses of rice hulls in the province. More than half (52%) of RH produced in Nueva Ecija are also to cement manufacturers, 35% to paper mills, 4% to poultry raisers and 2% to feed mills. Almost 7% of the RH produced is used as heat source for mechanical dryers (MD). Emission from indirect-fired rice hull fed furnace (RHF) developed by PhilMech for MDs amounted to 0.01563 kg CO sub 2e per ton of RH. Results of the study showed that cost of emission for RHF is negligible while the cost of emission from other RH uses ranged from Php580 to Php849 per ton of RH. The current utilization of RHF for MDs can reduce the emission by 951 to 1,107 kg CO sub 2e per ton of RH. This has a corresponding value of Php502.22 to Php584.60 per ton of RH when transported and utilized in cement manufacturing firms and paper mills. Increasing the utilization of RH as heat source for MDs in Nueva Ecija will reduce carbon emissions associated to RH transport and other RH activities. The use of MDs with RHF among farmers' and irrigators' associations must be encouraged to increase the utilization of RH for grain drying. Other policy options are identified to increase the RH use to mitigate GHG emissions.
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