Hydrogen Sulfide Removal - Odor Control Systems

• Hydrogen sulfide is a gas released by anaerobic bacteria found in nearly
• ALL water collection and treatment processes.
• In addition to being extremely odorous, hydrogen sulfide is corrosive and toxic.

and water treatment plants, collection facilities and industrial establishments, can reach concentrations in excess of 100 ppm. It is important to remove these sulfides because:

• Sulfide emissions represent the primary source of odor complaints. The odor threshold of hydrogen sulfide is less than 2 ppm.
• The sulfuric acid formed from hydrogen sulfide is extremely corrosive and is destructive to facilities and infrastructure.
• Even slightly elevated concentrations of hydrogen sulfide are hazardous to personnel. Exposure to concentrations as low as 5 ppm can affect the eyes and lungs, increasingly higher concentrations quickly deaden the olfactory abilities, compounding the likelihood of more serious consequences eventually leading to death.

MARCAB has odor control installations from Coast to Coast in a large variety of applications:

• Head Works
• Sludge Holding Tanks
• SBR`s
• Wet Wells
• Pump Stations
• Lift Stations
• Covered Clarifiers
• Siphons

Basically, ANYWHERE foul air can be captured MARCAB Odor Control Systems are Effective.

Hydrogen sulfide is the leading cause of odor complaints. In many cases removing the hydrogen sulfide, removes the offensive odor. The main component of a MARCAB Odor Control System is the time proven Iron Sponge technology. Iron Sponge has been used in scrubber systems to remove hydrogen sulfide for over half a century. Iron Sponge is a woodchip impregnated with hydrated ferric oxide which reacts with hydrogen sulfide to form ferric sulfide and water, thus removing the hydrogen sulfide from the foul-air stream:

Fe₂O₃ o H₂O + 3H₂S . Fe₂S3 + 4H₂O

The ferric sulfide then reacts with the water and oxygen present in the system to re-form hydrated ferric oxide and elemental sulfur, thus regenerating the bed continuously:

2Fe₂S₃ + 3O₂ + 2H₂O . 2Fe₂O₃ o H₂O + 6S
This process continues until eventually the Iron Sponge is coated with elemental sulfur and is removed from the system, disposed of at a standard landfill and replaced with a fresh supply.In some cases, some odors still remain after the removal of the hydrogen sulfide. In these cases MARCAB adds a secondary stage to our scrubber systems consisting of a smaller amount of carbon.With all the hydrogen sulfide removed, the carbon will only be required to remove any remaining VOC`s, thus greatly increasing the longevity and cost effectiveness of the carbon.

• NEMA 4X Control Panels
• Variable Frequency Drives
• Differential Pressure Gauges
• Stainless Steel Fan Construction