Dairy Waste Flow (image) University of Illinois at Urbana-Champaign Caption Estrogens in dairy wastewater degrade quickly when exposed to the air, but persist in wastewater, the researchers found. Credit Wei Zheng Usage Restrictions Image may be used only with stories about the research described in this release. Credit required Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.