Abstract
Production routing problem; is a supply chain problem where production, inventory, distribution and routing decisions are made together. The main aim of this problem is to make more cost-effective decisions, with decisions being made in an integrated manner. In this study, a decision support system that deals with the closed loop version of this problem is proposed. In the proposed decision support system, the DH algorithm has been applied for the production routing problem in closed loop supply chains. The DH algorithm decomposes the problem and aims to solve sub-problems interactively in a small time. In order to demonstrate the real-life applications of the system, the problem examined for a one-month planning period is applied for a company producing fats oil and it is found that the costs are lower than the current application.