Document Type
Patent
Publication Date
February 2010
Patent Number
7655143
Abstract
A method of stimulating nitrification at low SRT by elevating pCO2 during aeration is disclosed. The improvement on solids settling performance when elevated pCO2 was supplied after 2 hours within the React cycle is consistent with the previous results that identified inorganic carbon as a potential remedy to poor settling and bulking sludge problems in activated sludge systems. Elevated pCO2 increases the concentration of carbon dioxide and lowers the pH, which improve nitrification. The specific growth rate of nitrifying bacteria is sensitive to pCO2, pH, and dissolved oxygen (DO). The DO is a function of the aeration rate. Elevating the pCO2 and lowering the aeration rate provides conditions for nitrification rates that are comparable to conventional systems. However, the lower aeration rate yields significant energy cost savings.
Application Number
11/832,057
Recommended Citation
Stroot, Peter G.; Posso-Blandon, Lina; and Morris, Raymond A., "Carbon dioxide stimulation of nitrification in activated sludge reactors" (2010). USF Patents. 461.
https://digitalcommons.usf.edu/usf_patents/461
Assignees
University of South Florida
Filing Date
08/01/2007
Primary/U.S. Class
210/620
