US 6,982,036 B2
Chemically enhanced primary sludge fermentation method
Bruce R. Johnson, Boise, Id. (US)
Assigned to CH2M Hill, Inc., Englewood, Colo. (US)
Filed on May 24, 2004, as Appl. No. 10/853,472.
Claims priority of provisional application 60/489065, filed on Jul. 21, 2003.
Prior Publication US 2005/0016920 A1, Jan. 27, 2005
Int. Cl. C02F 3/00 (2006.01)
U.S. Cl. 210—607 18 Claims
OG exemplary drawing
 
1. A method of treating wastewater to increase effluent volatile fatty acid content comprising:
providing a wastewater to a primary treatment vessel;
adding a select quantity of a chemical to the wastewater to enhance separation of organic matter from the wastewater, wherein the select quantity of the chemical added to the wastewater is selected to cause at least one of a desired decrease in phosphorous concentration and a desired increase in the quantity of primary sludge removed in a removing step;
removing separated organic matter from the chemically treated wastewater to form a primary sludge and a primary effluent;
fermenting a portion of the primary sludge to form a volatile fatty acid rich liquor; and
mixing the volatile fatty acid rich liquor with the primary effluent to form a volatile fatty acid enriched effluent.