The present study proposes a mixed integer linear programming (MILP) approach for optimal design of a sustainable combined supply chain for the production of biodiesel using as a feedstock dairy waste scum generated from the implementation of optimal product portfolio of dairy supply chain. The latter includes models of economic and environmental impacts of the combined supply, constraints and an optimization criterion in terms of capital and operation costs. Тhe environmental impact is assessed through greenhouse gas emissions obtained through whole life cycle of the products. The proposed approach is implemented on a real case study from Bulgaria. As a result, optimal operating conditions of the considered supply chain, which includes: dairy farms portfolios, dairy plants portfolios, production capacity and location of biorefineries that should be built, performance of biorefineries and transportation routes are obtained. It can be used as a tool for decision-making.

本研究提出了一种混合整数线性规划 (MILP) 方法，用于优化设计可持续的组合供应链，以生产生物柴油，使用乳制品供应链的最佳产品组合实施产生的乳制品废物浮渣作为原料。后者包括综合供应、约束条件和资本和运营成本方面的优化标准的经济和环境影响模型。Т通过产品整个生命周期获得的温室气体排放来评估环境影响。建议的方法是在保加利亚的一个真实案例研究中实施的。因此，所考虑的供应链的最佳运营条件，包括：奶牛场组合、奶牛场组合、获得应建设的生物炼制厂的生产能力和位置，生物炼制厂的性能和运输路线。它可以作为决策的工具。