The economic study of centralised water reuse exchange system in the industrial park considering wastewater segregation

Abstract

One possible solution to minimise freshwater consumption in the industrial sector is the reuse of treated wastewater from industry. In this paper, three mathematical models are presented to maximise the centralised system's profit by considering wastewater segregation with multiple contaminants. The idea of wastewater segregation was applied to classify different qualities of wastewater into multiple grades. The basic model was tested with a case study of scenarios with a different number of water headers for segregation and different desired qualities of regenerated water. The penalty models were tested with two different penalty rates when sudden flowrate fluctuations occurred on the source side. The results obtained showed that wastewater segregation can bring a high profit to the centralised system and provide significant freshwater savings to the industry. The analysis of penalties showed that penalties were necessary to ensure that the centralised system could make a profit and operate throughout the year.