Coupled optimization-simulation water quality model for regional water quality management

Watershed-based point sources permitting strategy and dynamic permit-trading analysis

“…The spectrum of applications may include WLA for water pollution control (Chen and Chang, 1998), optimal deployment of water quality monitoring stations Chang, 2002, 2004;Ning et al, 2006), and planning, design and operation of regional sewer systems (Chang and Hernandez, 2006). A variety of functional forms for optimization analyses were derived and assessed to ensure the credibility and reliability in applications (Margeta, 1984;Vieira and Lijklema, 1989;Lee and Wen, 1996a, b;Chang et al, 1996a, b;Cardwell and Ellis, 1996;Somlyo´dy, 1997;Jolma et al, 1997;Onur et al, 1999;Chen and Chang, 1998;Schu¨tze et al, 1999;Dorn and Ranjithan, 2003). To test the robustness of these strategies or to assess an independent policy, simulation analyses were often used to pinpoint insightful features on a river basin scale (Grayson et al, 1994;Hosoi et al, 1996;Ning et al, 2001).…”

Water quality modelling and optimisation of wastewater treatment network using mixed integer programming

“…In this work, the relationship between treatment levels and efficiency was assumed and is represented in Table 1 and was also based on the fact that the higher the treatment level required, the more expensive the treatment becomes. Coupling of stream simulation models and mixed integer programming has proven to be a valuable tool in water management studies (Finney et al, 1977;Margeta, 1984). The approach to such problems was implemented and illustrated through the work of Liu et al (2011) where mixed integer optimisation approach was used on an integrated resource management problem.…”