Cost models for small wastewater treatment plants

The cost models of small wastewater treatment plants serving to population sizes of 2000 to 25,000 were prepared for Turkey with intermediate degree of accuracy. In the first phase, kinetic models of aerated lagoon, stabilization pond, trickling filter, oxidation ditch and rotating biological contactor (RBC) were derived in terms of area and flow rates at various treatment efficiencies considering different temperature ranges. Secondly the construction, mechanical, electrical equipment, operation and maintenance costs were computed as function of flow rates for each biological treatment process in the development of cost models. These models will be employed in the selection of the appropriate biological treatment process before investment of limited funds.