Sul-Fight

Sul-Fight: Odor / Corrosion Control

Hydrogen Sulfide

As utilities stretch the limits in providing wastewater service and maximizing the efficiency of conserving water in their processes, hydrogen sulfide grows as an issue. There are three major concerns with hydrogen sulfide: odor, corrosion and health.

  • Odor:
    Hydrogen sulfide has the odor of rotten eggs. As an odorant, hydrogen sulfide is considered offensive at levels as low as 2 ppm.
  • Corrosion:
    Hydrogen sulfide causes corrosion to metals and concrete. However, it is not the hydrogen sulfide that is corrosive, but the conversion of hydrogen sulfide by thiobacillus bacteria. This is proven by looking at the corrosion that is on concrete and metal above the liquid level.
  • Health:
    Hydrogen sulfide is a severe danger to human exposure. View the Hydrogen Sulfide Toxicity Chart. 

Factors That Influence Hydrogen Sulfide Odor / Corrosion

  • Time:
    As residence time increases, hydrogen sulfide concentration increases.
  • Temperature:
    37C is ambient temperature for sulfate reducing bacteria (SRB) growth. So as the temperature increases, the bacteria count increases also.
  • Agitation:
    Agitation does not increase the amount of hydrogen sulfide but does increase the amount of hydrogen sulfide in the air.
  • Concentration:
    As biological oxygen demand (BOD) increases, the sources for oxygen decreases. SRB turns to sulfates for their source of oxygen, producing hydrogen sulfide.

Sul-Fight

When Sul-Fight comes in contact with hydrogen sulfide and other sulfurous compounds, the negative ion on the sulfur bonds with one of the positive ions on the Sul-Fight. This reaction produces a non-odorous and non-corrosive sulfonated compound. The reaction is instantaneous and irreversible at ambient temperatures. Unlike metal ions, the Sul-Fight compound is water soluble and does not precipitate out in lift stations, force mains or gravity sewer lines.

Sul-Fight is designed for preventing corrosion and removing odors at locations where hydrogen sulfide already exists (manholes, lift stations, sludge holding tanks, air scrubbers and belt press rooms). However, Sul-Fight has been proven at removing hydrogen sulfide in force mains where the retention time exceeds three to five days.

Feed Locations

Manholes When hydrogen sulfide and corrosion are an issue, Sul-Fight can be fogged into the station using the B.C. Fogging System.
Lift Stations For hydrogen sulfide removal, fog Sul-Fight using the B.C. Fogging System. For long retention time force mains, drip feed Sul-Fight into the wet well or direct inject into the wastewater force main. Sul-Fight has shown effective at retention times greater than five days.
Sludge Holding Tanks Inject Sul-Fight into the sludge line going to the holding tank.
Belt Filter Press Inject Sul-Fight into the sludge line at least 30 feet from polymer injection point. Sul-Fight will aid in polymer efficiency.
Headworks If headworks are covered, fog Sul-Fight about the influent using the B.C. Fogging System. If the headworks are uncovered, inject Sul-Fight into the effluent prior to the headworks.
Air Scrubbers Sul-Fight can replace bleach as a non-hazardous alternative.

Aulick Chemical Solutions will design and install a chemical feed system to meet your specific application. For more information on the B.C. Fogging Systems, consult with your sales representative and visit the Systems page. Consult with your sales representative for proper dosage procedures and application.