Recent research on advanced wastewater treatment methods and techniques has generated a new set of technologies developed for use at anything from the household to the city scale. However, one of the central issues in the application of new technologies is the relevant scale at which to design and implement physical systems. This contribution reports the design and use of a demand based simulation model to study issues of appropriate scale and connectivity for a wastewater reuse system. The particular case of membrane bioreactors as treatment units to supply sub-potable demand is considered in detail. Results identify optimum levels of system connectivity and size with regard to both the cost of distributing recycled water and savings in potable quality resources.

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