Study on Carbon Emission Accounting of Technological Processes in Synergistic Treatment and Disposal of Sludge and Food Waste

Abstract

To solve the problem that sludge and food waste production increases year by year and consider the characteristics of both, the synergistic treatment of sludge and food waste is a hot research topic at present. Still, the evaluation of a synergistic treatment system from low carbon emission reduction is rarely discussed. Based on the methodology principle of IPCC, this paper constructs the calculation method of carbon emissions and carbon sinks for each process link in the collaborative treatment process of sludge and kitchen waste. Taking a sizeable domestic sewage treatment plant as an example, the carbon emissions under typical working conditions are calculated. The carbon emission characteristics are analyzed to provide a reference for the optimization of future processes. The results show that the dewatering and drying of biogas residue is the primary source of carbon emissions in collaborative treatment and disposal, followed by sewage treatment. The biogas produced in the synergistic anaerobic digestion process can provide energy, so the process has a significant carbon emission reduction effect. Considering the limitations of the current dehydration and drying methods of biogas residue, this study provides theoretical support and policy suggestions for future process innovation.