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ADVANCE FOR SATURDAY JULY 2017--This machine, which is hitched to a trailer and taken to a wastewater treatment facility in Rosemount, converts pond scum into biodiesel, is seen on Thursday, June 22, 2017 at the Biosystems and Agricultural Engineering Building in St. Paul. The goal of the research is to streamline the disposal process of scum, which maximizing biodiesel output, moving toward zero waste when treating water. (Ellen Schmidt /The Minnesota Daily via AP)

ADVANCE FOR SATURDAY JULY 2017--This machine, which is hitched to a trailer and taken to a wastewater treatment facility in Rosemount, converts pond scum into biodiesel, is seen on Thursday, June 22, 2017 at the Biosystems and Agricultural Engineering Building in St. Paul. The goal of the research is to streamline the disposal process of scum, which maximizing biodiesel output, moving toward zero waste when treating water. (Ellen Schmidt /The Minnesota Daily via AP)

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