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Abstract
The paper presents a life cycle costing model and a mathematical programming model to identify the least cost sludge dewatering process and the optimum polymer dose to be used for sludge dewatering, respectively. The life cycle costing model is based on an infinite horizon and it allows for incremental expansion in the capacities of the sludge dewatering process as demand rises. A new nonlinear formulation for the minimization of the combined costs of polymer dose and transportation is presented. These models were used for the selection of the least cost sludge dewatering process and the determination of the optimum polymer dose for two wastewater treatment plants in Kuwait. These formulations are generic and hence can be used for different types of sludge dewatering processes or polymers. Relationships have also been developed to assess the impact of distances to disposal or reuse site(s) from the wastewater treatment plant location on the optimum polymer dose.