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Odor Control Overview
Purpose
Odors are currently one of the leading concerns of the public in regards to wastewater treatment facilities. Given the City's WWTP highly visible location, it is important that the treatment facility be operated with odor collection and treatment facilities to minimize off-site odors.
Odor Control Plan
In 2008 an odor control plan determined the treatment plant locations with the highest intensity and/or highest volume of odor. The following high odor sources were identified in order of highest potential for offsite odorous air emissions: 
  • Influent Pump Station Wet Well
  • Primary Clarifiers
  • Solids Handling Building
  • Former Grit Works
  • Aeration Basins
  • Headworks Building
  • Secondary Clarifiers
As a result of this evaluation, most locations were covered and foul air was captured and sent to biofilters for treatment. The aeration basins and secondary clarifiers remain uncovered, and may be addressed in the future if needed.
Description
Covers are installed on unit processes that have high potential for odors.  Each covered process is equipped with an odor control fan which either pulls or pushes the foul air to a biofilter supply fan.
Two biofilters are installed, one to treat foul air from liquid streams and one for the solids stream.
Fan F-42004 for Primary Clarifiers and Wet Well6
  Fan F-42004 pulls air from covered Primary Clarifier 2 and the covered Influent Pump Station Wet Well and pushes it to the covered Primary Clarifier 1. The air exits the cover of Primary Clarifier 1 and flows through a backdraft damper and then joins a foul air header where it combines with foul air from the Biofilter Fan Building and the Screenings Building before being conveyed to the inlet of biofilter fan F-31031A. The biofilter supply fan then pushes the combined foul air stream to Biofilter 2.
Fan F-51005 for Solids Dewatering Building6
  Fan F-51005 pulls foul air from the section that includes the overflow sumps for Digesters 2 and 3, the belt press and gravity belt thickener. Covers are installed over the digester overflow sumps and fume hoods over the belt press and gravity belt to capture fugitive odors.

A grease filter is installed on the inlet side to the odor control fan, and backdraft damper on the fans prevents air from traveling backwards through the odor ducts. The fan pushes foul air into a common 36 inch foul air duct that is connected to the inlet of biofilter fan F-31031B. The biofilter supply fan then pushes the air into Biofilter 1.
Fan F-51020 for Solids Dewatering Building6
  Fan F-51020 pulls foul air from the section that includes the overflow sump from Digester 1 and the truck loadout area.  Covers are installed over the digester overflow sumps and fume hoods over the belt press and gravity belt to capture fugitive odors.

A grease filter is installed on the inlet side to the odor control fan, and backdraft damper on the fans prevents air from traveling backwards through the odor ducts. The fan pushes foul air into a common 36 inch foul air duct that is connected to the inlet of biofilter fan F-31031B. The biofilter supply fan then pushes the air into Biofilter 1.
Fan F-12051 for Screenings Building 6
  Odor control fan F-12051 draws foul air from a hood above the screenings dumpsters, the screening room, the influent junction box, and from the headspace above the incoming sewers below the screens. The foul air flows through a grease filter on the inlet ducting of the fan, then is pushed through a backdraft damper. The duct then joins a foul air header where it combines with foul air from the Biofilter Fan Building, Primary clarifiers and the influent pump station wet well and conveyed to the inlet of biofilter supply fan F-31031A. The biofilter supply fan then pushes the combined foul air stream to Biofilter 2.
Biofilter Fan Building6
  Two foul air ducts pull air from the Biofilter Fan Building. One duct removes foul air from the channels of the grit room, and the other pulls air from the grit dumpster area. Flow from these ducts joins a foul air header where it combines with foul air from the Screenings Building, the primary clarifiers and the influent pump station wet well and conveyed to the inlet of biofilter fan  F-31031A. The biofilter supply fan then pushes the combined foul air stream to Biofilter 2.
Biofilter Supply Fans F-31031A and F-31031B6
  Two biofilter supply fans are installed in the Biofilter Fan Building. Fan F-31031A pulls foul air from the liquid streams and pushes the air to Biofilter 2. Fan F-31031B pulls foul air from the Solids Handling Building and pushes the air to Biofilter 1.
Biofilter6
  Two biofilters operate in parallel to treat foul air from treatment processes. Both beds are made of inorganic media. Biofilter 1 treats foul air from solids handling processes and it's dimensions are 45 X 54.  Biofilter 2 treats foul air from liquid stream processes and it's dimensions are 45 X 54.

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Last Updated: 9/16/2013 11:34:39 AM
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