Perkins Engineering Consultants, Inc. served as prime design consultant assisting the City of Garland with an update of the activated sludge process in the 24 MGD Rowlett Creek Wastewater Treatment Plant. The project included installation of new high speed turbo aeration blowers, air piping, and fine bubble membrane diffusers. A grit and snail removal basin and equipment were also included in this project for continuous removal of snails from the plant’s trickling filter process. The existing aeration system included four multistage centrifugal blowers. The project was placed in service in 2011 at a cost of $2.6 million.