|
 |
The Problem: The plants NPDES permit specifies a minimum dissolved oxygen of 6 mg/l at the wastewater outfall into the Miami River. During normal operation the dissolved oxygen increase is accomplished in a cascade basin that works very well. However, during storm events, the river can rise to levels that completely flood the cascade basin rendering it useless.
The Solution: Mazzei Airjection® system was chosen as the Best Available Technology, and Hydro Mechanics, Cincinnati Ohio, was contracted to supply an integrated System for this post-aeration process.
Due to the confined space in the cascade basin, and limited access to the site, a modular drop-in design incorporating a vertical turbine pump, Mazzei Model 12050 venturi injector and Mazzei MTM nozzle manifold was adopted. The modular/drop-in system was fabricated off site and designed to cantilever from the wall of the cascade basin without modifications to the tank. Installation and start up took only about 4 hours.
The aeration system was designed to provide sufficient oxygen transfer to raise the dissolved oxygen of the plant outfall from 3.5 mg/l to 6 mg/l under storm event plant flow conditions up to 26 MGD.
The Result: A quiet, efficient, reliable back-up emergency aeration system that allows the plant to meet NPDES outfall D.O. requirements. During a storm event in 2004 the river rose and flooded the cascade basin.
The Mazzei/Hydro Mechanics post-aeration system maintained the plant outfall D.O. at levels >6.0 mg/l at flows up to 26 MGD. The post aeration system was able to maintain the outfall at >5.5 mg/l even when the plant flow reached 31 MGD.
For more information contact:
Mazzei Injector Corporation
500 Rooster Drive
Bakersfield, CA 93307
Telephone 661-363-6500
Fax 661-363-7500
Email: info@mazzei.net
Web site: www.mazzei.net
© Copyright 1998 - 2008 Water and Wastewater.com
Top of Page
