Project Description

Name: Keeping Water Running While Transforming Waterworks Plant
Location: Round Rock, TX
Owner:Lower Colorado River Authority
Design Engineer: HDR Engineering

The Brushy Creek Wastewater Treatment Plant project completed in 2009 was a $26M, 10 MGD expansion of an existing wastewater treatment plant near Austin, Texas.
While not unusual to perform a “bypass ” to maintain a water or wastewater treatment plant’s operating capacity while improvements are being made, the Brushy Creek project required one of the longest and largest.  A complete 24/7 bypass operation was required for 2 months.  It consisted of seven 12-inch pumps, capable of bypassing 37 MGD, and more than 1,000 feet of pipe!

Creative Solutions

Our team found creative ways to perform the complex retrofit and rehabilitation of the headworks process and piping, sludge dewatering equipment and piping and the pump station inside, on top of and underneath enclosed masonry buildings to achieve a most successful bypass without any loss of plant capacity.

Modification of Existing Facilities

These included expansion of the influent lift station and screen and grit facility along with new aerations, blower facilities, two 130-foot diameter final clarifiers, new UV disinfection system, new solids dewatering facility with upgraded 3-meter belt filter presses and an odor control system.

Project Challenges

2-Month Bypass – With Full Plant Operational the team planned and supervised the clarified inffluent channel bypass for tie-in of the new UV treatment facility to the plant, all while maintaining full plant capacity.