Struvite, a phosphate mineral, clings to the interior walls of a heat exchanger at the Madison sewage treatment plant on July 15, 2008. University of Wisconsin-Madison soil science professor Phillip Barak and two of his students are working to develop a way to stop the mineral from forming cement-like blockages inside sewage treatment pipes.
©UW-Madison University Communications 608/262-0067
Photo by: Bryce Richter
Date: 07/08 File#: D200 digital camera frame

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