The atypical design of the Cohasset (Mass.) Wastewater Treatment Plant confuses visiting operators and challenges those who run it. Mark Cataldo, project plant manager with United Water, inherited the 46-year-old facility in January 2011.Although the treatment process had been upgraded to tertiary membrane bioreactors in 2001, many necessary improvements confronted him. Tim Swimm, operations and maintenance technician, joined Cataldo in July 2012. Together, they often worked with very little while significantly revitalizing the plant.David Burns, environmental engineer with the state Department of Environmental Protection, recognized their efforts and was instrumental in the plant receiving the 2013 Best Small Wastewater Treatment
