OPTIMIZATION OF INTERNAL LOGISTICS IN A WASTE MANAGEMENT COMPANY WITH QUEUING THEORY

The number of companies for collection, processing and disposal of waste is increasing, as is the amount of waste we produce. Bigger companies have their own vehicle fleet, their own collection centers and they often cover large geographical areas. For such network of supply of services, a quality logistic organization is needed. The paper focuses on a case study of a Slovenian waste management company, which has a well-organized external logistics system on one hand, but a lacking organization of internal logistics on the other. The paper will focus on potential for optimizing the process of vehicle weighing and fuel filling, since this process represents a bottleneck of the internal logistics. Congestions appear often due to excessive vicinity of the weighing device and the gas pump. During the refueling of a bigger truck the weighing device becomes useless as the truck trailer is still standing on the balance. The paper will present different improvement scenarios for internal logistics, which will be calculated using stochastic processes and queuing theory.