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RSB-7 Reduces H₂S and FOG in a Municipal Sewer System

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RSB-7 Reduces H₂S and FOG in a Municipal Sewer System

Treatment Objective:

  • Reduce FOG Accumulation biologically
  • Reduce disposal volumes

Materials & Methods:

The municipality previously utilized calcium nitrate for treating the sewer system. Upon surveying the system, three dosinglocations were identified upstream of fat, oil, grease (FOG), and hydrogen sulfide (H₂S) areas. RSB-7, containing dormant Bacillus spores and a robust micronutrient blend, was administered multiple times daily during low-flow periods. Concurrently, calcium nitrate treatment continued at a reduced dose of 50 gallons per day (GPD). Continuous monitoring of FOG and hydrogen sulfide levels was conducted, with FOG represented in gallons per day and hydrogen sulfide monitored downstream using gas detectors. Over a span of 2 years of treatment, hydrogen sulfide levels were consistently reduced byan average of 99%, while FOG accumulation decreased by 94%.


Results:

Fasts, Oils, and Grease:

In 2020, accumulation decreased by 655 gallons per day (70%), and in 2021, it decreased by 881 gallons per day (94%). A significant portion ofthe fat, oil, and grease (FOG) underwent digestion and was emitted asCO₂ from the system, while the remaining FOG density substantiallydecreased with treatment. This reduction led to a monthly cost savingsof $9,300 in disposal expenses.

Hydrogen Sulfide:

While utilizing Remedia’s RSB-7 for biological treatment, hydrogensulfide (H₂S) levels were notably decreased by an average of 99%. However, discontinuing treatment led to a rapid increase in hydrogensulfide gas levels within just one week, despite the ongoing use ofcalcium nitrate.


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