Anaerobic digester (IMAGE) Iowa State University Caption An anaerobic digester used by the city of Ames' Water Pollution Control Facility. One of two recent feasibility studies by an Iowa State University research team exploring using prairie grass to make biofuels modeled an expanded network of anaerobic digesters in Ames. Credit Lisa Schulte Moore Usage Restrictions None License Original content 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.