猪粪好氧堆肥碳排放分析

以生命周期法为指导,应用排放系数法对猪粪秸秆好氧堆肥路径下碳排放量进行计算。本文研究的范围包括：堆肥厂内微生物降解活动产生的直接排放;加工设备电力消耗等上游活动产生的间接排放;有机肥作为化肥替代品减排量、土地施用后的土壤碳结合等下游活动减排量。结果表明：项目日处理420吨原料,可生产20吨有机肥,堆肥生物降解过程产生的直接排放为19.26 tCO₂e,电力消耗间接排放为17.84 tCO₂e,产品作为化肥替代品的减排量为0.87 tCO₂e,土地施用固碳量为113.4 tCO₂e。生命周期范围内,生产及施用有机肥净碳汇量为77.18 tCO₂e,可实现负碳排放,有效提升土壤固碳能力,可为农业减排降碳提供技术模式。

Carbon emission analysis of manure composting

Carbon emission from manure aerobic composting were calculated referring to the guideline of emission factor method and life cycle assessment. In this case study, total emissions include direct emissions from composting microbial degradation activities, indirect emissions from upstream activities such as electricity consumption of processing equipment, emission reductions from downstream activities such as organic fertilizer as a substitute for chemical fertilizer and soil carbon binding after land application. The results show that the project can dispose 420 tons of raw materials per day and produce 20 tons of organic fertilizer, which brings 19.26 tCO₂e direct emission from the compost biodegradation, 17.84 tCO₂e indirect emission from electricity consumption, 0.87 tCO₂e of emission reduction as a substitute for chemical fertilizer, and 113.4 tCO₂e carbon sequestration for land application. Within the scope of the whole life cycle, the net carbon sink is 77.18 tCO₂e, which can achieve negative carbon emission and effectively enhance the soil carbon sequestration capacity, providing a technical model for agricultural emission reduction.