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:
Mar. 18, 2003
Filed:
Nov. 09, 2000
Jan Allen, Shoreline, WA (US);
CH2M Hill, Inc., Englewood, CO (US);
Abstract
A biofilter apparatus includes at least one container having a height, length, and width containing a deep, low density, porous media within the container. An airflow apparatus is constructed and arranged to deliver a flow of air to be treated to the filter media. The airflow apparatus provides at least 37.5 cfm/ft with the porous media creating a backpressure of not more than about 10 inches of water. The media preferably consists of about 30-40% shredded tree bark particles, about 30-40% shredded wood, and about 30-40% composted wood sized such that 95% of the media will pass through a three inch screen and be retained by a 0.5 inch screen. A fluid mister may be provided in fluid communication with the flow of the air to be treated for introducing humidity to the air. The method for treating air via biofiltration utilizes the biofiltration apparatus discussed above and includes directing contaminated air into the container through the airflow apparatus and through the media at at least 37.5 cfm/ft with the porous media creating a backpressure of not more than about 10 inches of water. The method further includes delivering a water mist to the inlet piping for introducing humidity to the air.