Researchers have long known how to use the bacteria in wastewater to generate energy — whether biogas or bioelectricity — and to recover the nutrients from the organic material, says Zhen "Jason" He, Ph.D., a professor in the Department of Energy, Environmental & Chemical Engineering in the McKelvey School of Engineering at Washington University in St. Louis. But these methods usually did so "at the expense of the water," which could have been filtered and reused but was not, He explains.
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