Strongly Aerobic Environment
Safe and Effective
Reliable and Consistent Results
Cost Effective Process
Municipal & Industrial Applications
Low Energy Demand

• Uses FM Pressure to produce DO levels much higher than otherwise possible.
• Aerobic control for 10 + miles of FM conveyance.
• Eliminates Sulfur Reducing Bacteria (SRB’s).
• Prevents formation of sulfides and resulting odor concerns.
• Prevents sulfuric acid formation and resulting corrosion.
• Removes anaerobic biomass that can constrict force main flow.
• Eliminates anaerobic shock loading of WWTP.

Force mains are nutrient-rich anaerobic environments.  In this environment, Sulfate Reducing Bacteria (SRBs) can reduce sulfates to sulfides, while simultaneously depressing the pH.  Under acidic conditions, sulfides form hydrogen sulfide, a common sewer gas, which readily volatilizes upon agitation of the sewer water, leading to odor complaints.  At locations within the sewer line where oxygen in the air can be present, the hydrogen sulfide vapor will react with oxygen to form sulfuric acid, which condenses on surfaces, causing corrosion to concrete and steel. 

IER’s Gener-Ox™ system changes the anaerobic environment of the force main into an aerobic environment, causing the SRBs to encapsulate and eventually die.  No SRBs, no sulfide formation.  No sulfide formation, no odor or corrosion. 

In a typical installation, the Gener-Ox system will draw a side-stream of sewer water from a wet well, pressurize it, aerate it, and dissolve oxygen into it to achieve the required DO level for reinjection in the force main.  An optional headspace scrubber may be provided to scrub sulfides from the wet well headspace.


How IER's Gener-Ox™ System Works

Hydrogen sulfide is naturally generated by Sulfate Reducing Bacteria in an anaerobic environment.  Depending on the chemical nature of the sewer line, a force main can become a sulfate-rich anaerobic environment.  Therefore, the sulfide problem is the result of chemistry and anaerobic microbiology.

The chemical-free Gener-Ox™ system works on a very simple principle: change the environment, change the biology, change the results.

Most chemical approaches to the sulfide problem attempt to sterilize the force main using either chlorine or other oxidants or strong alkalis.  A newer popular approach is to feed the force main with a nitrate salt which the anaerobes preferentially reduce to odor-free nitrogen.

The Gener-Ox™ system is the only approach that addresses the root cause of the problem.  Gener-Ox™ inhibits the formation of hydrogen sulfide in the first place by making the force main aerobic, rendering all anaerobes and sulfate-reducing bacteria inactive or nonexistant.

In order to maintain aerobic conditions in a force main, the DO level at the start of a force main must often be higher than the saturation DO level in the wet well.  For example, a lift station pumping 500,000 gpd through a 12-inch, 10,000 foot force main with an oxygen uptake rate of 0.08 mg/L/min will require a DO level at the start of the force main of about 56 mg/L in order to maintain aerobic conditions upon discharge.  This is accomplished by aerating under pressure, driving more oxygen into solution than is possible in an open vessel. 




The saturation DO level of water depends on temperature and oxygen pressure.  Sewage in an open vessel, such as a wet well, has a saturation DO level of about 8.5 mg/L at 70oF.  However, in a force main under 30 psi pressure aerated with oxygen, the saturation DO level is in excess of 120 mg/L.  In this example, a Gener-Ox system fed with oxygen will dissolve 26 SCFH of oxygen into 25 gpm of sewer water (132 SCFH air into 125 gpm wastewater for air-fed) from the wet well and inject it into the force main, maintaining aerobic conditions throughout the force main. 

By aerating under pressure, the Gener-Ox™ system is able to raise the DO concentration to previously unattainable levels, enabling cleaner, simpler solutions to the sulfide problem.


Wastewater Transport Odor & Corrosion Control


Case Study:  Idaho Potato Plant
Case Study:  Montana Malt Facility

Click here for a free brochure on Gener-Ox™ (requires Adobe Acrobat Reader)

Product Specifications

Model Flow (GPM) Oxygen Dissolution Oxygen Dissolution Dimensions 
    (lb/day) (air-fed) (lb/day) (O2-fed) (LxWxH) (ft)
MTS 10 5 - 15 2 - 5 8 - 25 3 X 3 X 5
MTS 25 12 - 40 4 - 13 20 - 65 4 X 4 X 6
MTS 50 25 - 75 8 - 25 41 - 123 4 X 4 X 7
MTS 100 50 - 150 16 - 49 82 - 246 5 X 4 X 9
MTS 250 125 - 375 41 - 123 205 - 614 5 X 4 X 10

For further information or to schedule a trial of this technology, 
please contact
Dick Handley at

Inland Environmental Resources, Inc.
P.O. Box 18978

Spokane, WA 99228