The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2008
Filed:
Jan. 31, 2006
William Cheuk, Vancouver, CA;
Anthony Lau, Vancouver, CA;
Raymond Wong, Vancouver, CA;
Peter Doig, Vancouver, CA;
Bud Fraser, Vancouver, CA;
William Cheuk, Vancouver, CA;
Anthony Lau, Vancouver, CA;
Raymond Wong, Vancouver, CA;
Peter Doig, Vancouver, CA;
Bud Fraser, Vancouver, CA;
Vision Envirotech International Co. Ltd., Vancouver, British Columbia, CA;
Abstract
A system for controlling the aerobic phase of a wastewater treatment cycle in a sequencing batch reactor, comprising a tank, an air blower, at least one sensor for measuring the concentration of dissolved oxygen in the tank, and means to control the length of time that the air blower introduces air into the wastewater and to maintain at a constant level the volume of air introduced per time by the air blower. The length of time that the air blower introduces air is determined by the change in the slope of the curve representing the concentration of dissolved oxygen in the wastewater. The volume of air to be introduced per time by the air blower is determined based on the average concentration of dissolved oxygen from the previous wastewater treatment cycle.