Caculation of Carbon Emission During Co-composting of Food Waste and Agricultural Waste and Garden Waste:A Case Study of A Treatment Facility in Town
A co-aerobic composting treatment facility for food waste and agricultural waste and garden waste in a town in North China was taken as an example,the emission factor method was used to calculate the carbon emissions from collection,transportation,treatment and resource utilization.The carbon emissions were 143.71 kgCO2/t.The results showed that the carbon emissions in the collection and transportation stage were 1.04 kgCO2/t,which was lower than transporting to a centralized treatment facility.The direct carbon emissions in the treatment stage were 193.50 kgCO2/t.The unorganized escape of CH4 and N2O produced in the aerobic composting process was the key factor affected its carbon emissions level.The indirect carbon emissions in the treatment stage were 4.16 kgCO2/t,and the carbon emissions from equipment energy consumption were lower than the process of using heating and oxygen-supply equipment.The carbon reduction of compost products was 55 kgCO2/t,with obvious carbon reduction effects.Therefore,measures should be taken to reduce direct carbon emissions by maintaining the oxygen content of the heap at no less than 8%,the moisture content of 50%to 65%,the reaction temperature was above 55℃,and increasing closed auxiliary facilities,regularly turning operations,and ensuring sufficient composting time.
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