Brown and Caldwell Home Page

Brown and Caldwell engineers and scientists are technical and thought leaders in the environmental sector. Meet the people who have been advancing innovation for more than 70 years.
Author      Title/Abstract      

Comparison of Three Wet Weather Flow Treatment Alternatives to Increase Plant Capacity
Author: Don Esping, Bill Krill, Denny Parker, Jose Jimenez, Jim Fitzpatrick, Fenghua Yang and Tim Bate
Date: 10/12
WEFTEC 2012, New Orleans, LA, Sept. 29 – Oct. 3, 2012

The Milwaukee Metropolitan Sewerage District is evaluating alternatives to increase the South Shore Water Reclamation Facility wet weather treatment capacity from 300 to 450 million gallons per day. In this study, side-by-side testing of biological contact treatment, chemically enhanced sedimentation, and compressible media filtration was conducted to define treatment performance and design criteria for treating wet weather flows. Based upon wet weather testing conducted to date on primary influent, biological contact achieved the lowest effluent concentrations and met all project effluent water quality goals when operated at mixed liquor concentrations between 1600 and 2000 mg/L and contact times of 15 minutes. Compressible media filtration effluent solids and biochemical oxygen demand concentrations were also less than the project effluent goals when operating at filtration rates of 7.5 gpm/sf. Chemically enhanced sedimentation testing was inconclusive due to equipment malfunctions during testing. At the time of this writing, additional wet weather testing was ongoing.

This library contains published materials for which copyrights may be owned by entities other than Brown and Caldwell, but which are stored for limited uses by BC employees. Technical papers authored by BC employees generally may be printed and shared electronically with clients and prospective clients outside BC. Technical papers cannot be sold, and technical papers shared outside BC must have proper attribution of the original sponsoring organization or conference where the paper was presented. This attribution is embedded in each technical paper file when it is loaded into this library. Published articles from magazines or trade journals which are stored in this library are FOR INTERNAL USE ONLY and SHOULD NOT be distributed to clients or others outside BC, without express permission of the copyright owner. For questions regarding copyrights associated with any document in this library, or questions regarding copyrights in general, contact the Legal Department.