Brown and Caldwell Home Page
Technical Papers RECENT PAPERS    ALL PAPERS

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      


Results of the Large-Scale Pilot Investigation of the DEMON® Nitrogen Removal System in Pierce County, Washington
Author: Adam Klein, Larry Ekstrom, Amanda Summers, Jiang Wan, Bernhard Wett, Chandler Johnson, Lynn Williams, Dave Newman, Kate Green and Henryk Melcer
Date: 10/12
WEFTEC 2012, New Orleans, LA, Sept. 29 – Oct. 3, 2012

A four-month pilot investigation was conducted from April to August 2011 to assess performance of the DEMON® nitrogen removal system treating dewatering centrate at the Pierce County Regional Wastewater Treatment Plant near Tacoma, Washington. The centrate is projected to contain an average of 1,100 kg/d ammonia-nitrogen at the design year. The pilot system was a 6,000 liter (L) sequencing batch reactor (SBR), which processed an average of 1,500 L/d of centrate. Ammonia and total inorganic nitrogen (TIN) removal rates of 81.6 and 78.4 percent, respectively, were achieved over a 30-day averaging period. An alkalinity addition trial at the end of the investigation yielded ammonia and TIN removal rates of 99.8 and 93.3 percent, respectively. The pilot investigation validated preliminary performance assumptions, and led to the development of a number of design criteria for full scale application.

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.