Articles & Case Studies

Siemens replaces clarifiers in Denver’s Metro Wastewater Reclamation District plant

Posted: Friday 20th January 2012

Siemens Industry Automation Division is replacing secondary clarification treatment at theMetro Wastewater Reclamation District’s Robert W. Hite Treatment Facility in Denver,Colorado, USA, with ten Tow-Bro high-performance clarifiers. Improvements to the maintreatment facility are needed to replace aging clarification equipment and improve overalltreatment performance. Part of a two-phase plant expansion project, the systems are valuedat more than US$3.5 million. The clarifiers are expected to be shipped in 2012, with fiveprojected to come online in 2013 and the other five, in 2014.

The ten 140-ft diameter Tow-Bro high-performance clarifiers from Siemens Water Technologies, a business unit of Siemens Industry Automation Division, will be retrofit into existing concrete basins for rapid settled secondary sludge removal from the clarifier, with maximum solids concentration and minimum sludge agitation. The Tow-Bro clarifier will remove settled solids uniformly under a wider variety of flow, solids loading, and sludge settling conditions. The clarifier’s simple Unitube header design allows for flexible operation and easy maintenance.

Siemens first worked with the Metro District in Denver in 2008, when the company provided the district with twelve 130-ft Tow-Bro clarifiers worth approximately US$5 million for its North Secondary Improvements Project. The district selected the equipment provider for the latest plant upgrade because of Siemens’ experience and performance, service facilities and availability of qualified service personnel. Parts inventoried and quality assurance and warranty were also important considerations.

The Tow-Bro clarifier design uses a center-feed configuration with peripheral effluent launders. Flow enters the clarifier through a specially designed maze-type energy dissipating inlet that ensures optimal velocity and circulation of flow throughout the whole clarifier. After initial energy dissipation, solids are flocculated and settle to the tank floor where they are removed uniformly by the Tow-Bro Unitube Header. Concentrated settled sludge is returned to the aeration basin from the clarifier. Clarified effluent flows into an inboard launder and exits the tank. Scum is removed via a ducking skimmer assembly. The treated water then flows to the Metro District’s disinfection facilities for further treatment prior to discharge into the South Platte River.

The Metro District is the largest wastewater treatment facility in the Rocky Mountain West. The service area includes a population of nearly 1.7 million people and encompasses approximately 715 square miles, together with about 40 water and sanitation districts in the metropolitan Denver area. The Robert W. Hite Treatment Facility treats about 140 million gallons (530 mega liters) of wastewater each day which makes up 85 percent of the South Platte River once it is discharged.

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