An integrated approach to optimize the conditioning chemicals for enhanced sludge conditioning in a pilot-scale sludge dewatering process

► An integrated approach was developed to evaluate conditioner in sludge dewatering. ► Response surface methodology and grey-fuzzy logic were incorporated in evaluation. ► The mixed conditioner in a pilot-scale sludge dewatering process was evaluated. ► Sludge dewatering efficiency and chemical cost were considered in evaluation. ► The optimal composition of conditioner was obtained using the evaluation approach.