A fuzzy solution approach to supplier selection and order allocation in green supply chain considering the location-routing problem

In the field of supply chain, selecting a suitable green supplier could significantly help us decrease the cost and risks of the operations and increase the quality of green supply. This paper develops an integrated two-stage approach based on Fuzzy Analytic Hierarchy Process (FAHP) and multi-objective mixed-integer linear programming to select suppliers and allocate order in the green supply chain. In the first stage, suppliers are evaluated using FAHP method and in the second stage, a multi-product multi-period supply chain is developed considering green location-routing problem, discounting, and time window under uncertainty. Then, a fuzzy solution approach is applied to solve the proposed model using the data of a pharmaceutical chain in Iran. Results will verify the efficiency of the proposed model. (C) 2021 Sharif University of Technology. All rights reserved.