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:
Nov. 23, 1999
Filed:
Jul. 17, 1997
Gregory A Ellard, Tampa, FL (US);
Joseph M Bonazza, Pittsburgh, PA (US);
Miguel J Merino, Tampa, FL (US);
Tetra Technologies, Inc., Woodlands, TX (US);
Abstract
A method of degassing biological filters utilizing a backwash system wherein the steps of opening and closing valves are reduced, flow interruption through the filter is minimized, and the process of draining down a downflow filter is eliminated. A preferred method of degassing a plurality of downflow biological filters in a water treatment system comprises the steps of maintaining the influent flow throughout the degassing process, ceasing the effluent flow out of a filter selected to be degassed to prevent draining of the selected filter, introducing a backwash water flow into the bottom, and flushing of the filter until entrapped gases are released out of the filter. The backwash flow is then ceased and the effluent flow is recommenced to return the filter to service. The steps are successively repeated and the backwash pump remains on until all filters are degassed. The method of degassing a plurality of upflow biological filters comprises the steps of maintaining the effluent flow throughout the degassing of all filters, ceasing the influent flow into a bottom of a first filter to be degassed, introducing a backwash water flow into the bottom, flushing the filter until entrapped gases are released out of the filter, ceasing the backwash flow and recommencing influent flow to return it to service, and successively repeating the above steps to degas all other selected filters in the treatment system. The transition of the degassing process from one filter to another is seamless.