Assignment #2:
A business estate

A business estate contains a food market and a cafeteria. The market employs 6 persons (2 in the storehouse, 2 in the office and 2 at the registers) and the cafeteria an additional 2. The average amount of customers per day is approximately 100 for the market and 50 for the cafeteria.

The existing waste management system

According to the current waste scheme the following types of waste are sorted:

The amounts are based on estimates supplied by the local waste management company.

The existing waste containers
Costs of the old waste management system

The costs have been calculated for one year and the costs for emptying the waste containers and the treatment fees for the waste itself have been separated. The costs for ladfilled wastes were approximately 5000 euros, from which 650 euros were emptying fees. For cardboard the only costs were the emptying fees, 624 euros. There are no costs for paper as it is fetched free of charge.The contents of the different waste containers

The container for mixed waste normally contains not only plastics from product packages and damaged transportation platforms but expired foodstuffs as well. The public trash bins in the market and the cafeteria are emptied directly in the mixed waste containers. The waste from the cafeteria kitchen is primarily plastic –and bio-waste, but it is not sorted. Let us assume that one third of the waste produced at the estate is bio-waste, one third energy waste and the rest mixed waste.

A new waste management system

The local legislation is about to change, making the sorting of bio-waste mandatory. Design a system for the sorting of bio-waste and increase the efficiency of the existing waste management system so that sorting the bio-waste does not increase the overall waste management costs of the entire estate. The price for the treatment of bio-waste is 58 €/ton. The waste management company charges the same amount for emptying the waste containers regardless of size.