Co-digestion of sewage sludge with food waste is a beneficial pathway for sewage plants to enhance their biogas yield. This paper employs hybrid programming with system dynamics simulation to optimize such a co-digestion system from the perspective of demand-oriented biogas supply chain, thus to improve the efficiency of the biogas utilization. The optimum operational parameters of the co-digestion system are derived from the simulation model. It is demonstrated that the demand-oriented biogas supply mechanism can be effectively driven under market-oriented incentive policy. For better compensation of the external cost to assist the operations of the co-digestion supply chain, it is suggested that the substrate collection and transportation subsidy should be combined with the renewables portfolio standard to be implemented as the optimum incentives. The limitations of the study are discussed to lay the foundation for future improvements.

污水污泥与食物垃圾的共同消化是污水处理厂提高沼气产量的有益途径。本文采用混合编程和系统动力学仿真的方法，从需求导向的沼气供应链角度对这种共消化系统进行优化，从而提高沼气利用效率。共消化系统的最佳运行参数是从仿真模型得出的。实践证明，以市场为导向的激励政策能够有效驱动以需求为导向的沼气供应机制。为了更好地补偿外部成本，协助共消化供应链的运行，建议将基质收集和运输补贴与可再生能源组合标准结合实施，作为最优激励措施。讨论了该研究的局限性，为未来的改进奠定基础。