East Bank Wastewater Treatment Plant RAS Line and Pump Station Modifications

Trigon was selected to perform engineering, design and engineering services during construction for this project that involves improvements to Return Activated Sludge (RAS) facilities at the Sewerage & Water Board’s 200 MGD East Bank Wastewater Treatment Plant (EBWWTP).

Trigon worked closely with the S&WB’s private operations contractor which oversees the daily operations and maintenance of the EBWWTP.

One of two old 30-inch RAS lines ruptured in close proximity to two large clarifiers, causing the S&WB to install an above-grade temporary line on an emergency basis to maintain RAS operations. This project consisted of installing a new below-grade 30-inch PVC RAS line along a different alignment, which will be supported by pile structures due to poor ground conditions at the WWTP. An approximately 200’ section of 30-inch above-grade stainless steel piping will be replaced, along with replacement/modification of the discharge header inside the associated RAS pump station.

Additionally, the EBWWTP receives sludge from the S&WB’s West Bank WWTP via tanker trucks. This project also included installing new facilities to relocate where and how sludge is received from the tanker trucks.

This project also included installing new facilities to relocate where and how sludge is received from the tanker trucks. The project was completed in 2016.