Patent 7718064 was granted and assigned to Hesco Sustainable Energy on May, 2010 by the United States Patent and Trademark Office.
The invention provides improved methods of wastewater purification. The present invention provides a process for the energy efficient production of Class A biosolids. More particularly, sewage sludge is subjected to an anaerobic digestion process resulting in class A biosolids, whereby methane gas byproducts are utilized to meet the high energy demands associated with Class A biosolid production.