Faced with the need to upgrade its wastewater treatment plant (WWTP), the community of Traverse City, Michigan, wanted to do more than simply increase the capacity of its existing facility. Seeking to improve water quality, the area's residents set voluntary discharge limits that are well below those called for by the revamped plant's permit. To meet these stringent requirements without expanding the site's footprint, the project team is pursuing a novel approach that employs membrane bioreactor (MBR) technology and biological nutrient removal (BNR)―two advanced treatment techniques often thought of as incompatible. Because of the environmental leadership and responsibility demonstrated by the citizens and local governments of the Traverse City area, the existing Traverse City Regional WWTP is well on its way to becoming the largest MBR facility in North America and a model of sustainable design.
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