Abstract: With the proposed goal of carbon neutrality, in addition to production costs, energy consumption, and environmental benefits, carbon emissions have become a new focus when the organic solid waste treatment process were compared and selected. Based on accounting guidelines provided by the United Nations Intergovernmental Panel on Climate Change (IPCC), and combined with life cycle assessment (LCA), the carbon emissions of the three-phase organic solid residue of food waste pretreatment were calculated by dry incineration, anaerobic digestion and black tabanus biological culture. The results showed that after considering direct emissions, indirect emissions, and carbon offsets, the sequence of the total carbon emission from low to high was black tabanus biological culture, anaerobic digestion and incineration. The black tabanus biological culture was a high energy consumption process with the highest direct emission (54.92 kgCO2/t) and indirect emission (163.48 kgCO2/t). However, it could produce approximately 233 kg of organic fertilizer and 67 kg of biological feed by treating one ton of organic solid residue, resulted in significant carbon offsets benefits (274.09 kgCO2/t) and an overall carbon emission reduction effect of 55.69 kgCO2/t could be achieved. From the perspective of carbon emission, this treatment and disposal method was worth advocating.

Key words: food waste, organic residue, black tabanus biological culture, carbon emission, life cycle analysis