OdorDigest™ DuO System

Enduro OdorDigest DuO systems are a line of staged compartment systems capable of removing odorous compounds from a variety of sources. The DuO model line is a new approach that offers many advantages over other biological filter systems. They are primarily used for applications were there is medium to high levels of hydrogen sulfide along with other odors that require a high degree of treatment. It consists of an FRP box of a variety of sizes with an integral bioscrubber on the front end that removes most or all of the hydrogen sulfide and humidifies the air and is followed by a biofilter. The first stage promotes autotrophic bacteria and the second stage is design for efficient heterotrophic bacteria without interference from acid formation due to the hydrogen sulfide degradation.

The DuO offers the following benefits:  
   Great for high level of hydrogen sulfide and organic odors
   Lowest operational costs
   Simple operation
   Can utilize a wide variety of media and mixtures of media for specific treatment needs
   Highly effective in treating a wide variety of odorous compounds
   Multiple unified stages for reduced footprint
   Efficient humidification for optimal performance
   Simple and easy to install

PROCESS DESCRIPTION
Air is pulled or pushed from the source to the bottom of the system whereby odorous air enters the bioscrubber section and diffuses up through the Enduro’s BioScrub-XL foam. Spray nozzles, recirculation pump and make up water controls the optimal hydrogen sulfide removal. Heaters can be added to increase the air temperature if required. Humidified and hydrogen sulfide free air exits the top of the bioscrubber section and is transferred to the bottom of the biofilter compartment plenum. The humidified odorous air then diffuses up through the biofilter media that supports neutral biological activity. The odors are adsorbed in the biomass of the biological activity and consumed. Additional moisture is added through intermittent overhead spray system. A nutrient feed system adds nutrients to the overhead spray system if required. The DuO is available with a variety of medias including compost/wood chips combinations, lava rock and long life porous media (Enduro’s BioOdorSorb). To help overcome bed compaction problems common with organic medias such as compost/wood chip mixtures, grating with lava rock are used to help promote uniformed airflow. This promotes longer media life and reduced pressure drop.


SERVICEABILITY
Once the media becomes compacted or fouled based on high-pressure drop monitored by a differential gauge or performance is reduced, remove the top, and sequentially remove the media or built-up biomass by disinfection. Insert new media in the system and place the system back on-line. Ports are available for media and water system inspection.


MEDIA OPTIONS
The unique feature of the DuO is that it can incorporate a variety of media options. Each media has a specific characteristic that makes it optimal for the specific applications. The standard medias offered are:

Wood Clips/Compost Mixtures – A very popular media that offers a lot of flexibility for treatment of a variety of odorous compounds. The media has special buffers and additives to help with the media longevity and effectiveness.
Lava Rock – A low cost media that is usually used for hydrogen sulfide treatment. Lava rock last for many years and does not suffer from compaction like wood chips/compost mixtures.
Long Life Media (EnduroI’s BioOdorSorb) – Enduro has developed a media that incorporates a highly porous surface with a coating that provides nutrients, buffering agents and adsorptive sites for optimal heterotrophic bacteria growth. Media like is as long as 10 years.


STANDARD FEATURES & OPTIONS
All DuO systems come with simple standard components that are readily available for ease of operation and maintenance:

Standard features:
FRP vessel with:
   - Differential pressure gage
   - Air sample ports
   - Humidifier with Packing
   - Media
   - Removable Sectional Top
   - Water Piping and Spray Nozzles
   - Fan, FRP, with 3ph/230-460v/60Hz TEFC motor. Graphite impregnated
   - Media Irrigation System
   - Flanged inlet and outlet
   - Patented media support
   - Control Panel for Totally Automated Operation
   - Nutrient Feed System

Available Options:
   Humidifier with sump heater
   Grease/Mist Eliminator
   Sound Enclosure
   Various fan options: TEXP, epoxy-coated metal fan or others upon request