Design and Optimization of Circular Economy Energy Supply and Utilization Model for Aquaculture Courtyards Considering the Reuse of Manure and Sewage in Organic Composting Systems

Under the background of dual carbon goals and rural revitalization strategy, a design problem of energy supply and use mode of circular economy in courtyards represented by aquaculture is proposed, which takes into account the reuse of manure in organic composting system. At the same time, the economic and environmental optimization model is used to verify its advantages. Firstly, the energy demand and electricity and heat load characteristics of circular economy in aquaculture courtyards are studied, and the load model of circular economy in aquaculture courtyards is established; secondly, the energy supply and demand relationship of circular economy in aquaculture courtyards is studied, the energy flow mode is divided and sorted out, and the energy supply and use mode is planned according to local conditions; then, the optimization operation model of circular economy in courtyards is established, and the optimization operation strategy of electricity and heat energy utilization and supply and demand matching is studied with the goal of economy and environmental protection; finally, based on the field data of Shengdeku Village, Fuyuan City, Heilongjiang Province, the optimization operation simulation of circular economy energy supply and use mode of aquaculture courtyards considering the reuse of manure in organic composting system is carried out based on the planning. The simulation results show that the designed mode can effectively reduce energy operation cost and carbon emission under the premise of meeting the demand of electricity and heat load.