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Negative issues originating from grease and bacterial slime build-up in sewer force mains are as old as modern wastewater treatment is itself. This results in the release of harmful hydrogen sulfide which can cause serious odor and corrosion problems in your wastewater collection system.
A customer in East Tennessee asked Aulick to help problem solve an issue where they were experiencing an up-tick in hydrogen sulfide readings due to force main clogging. Aulick had worked with this customer for many years on various projects associated with their treatment methods and our first step in helping out was to conduct testing with an OdaLog in order to get an accurate reading of hydrogen sulfide levels.
Air release valves clogging and pressure build-up will result in a decrease in wastewater flow. The build-up in force mains will also increase anaerobic bacteria growth that lives behind the slime layer in force mains and feeds on the sulfates in wastewater. The challenge, herein described in this study, was to release the force main of clogs and build up while also ensuring a significant reduction in hydrogen sulfide.
Aulick’s 225 Force Main Stripper was quickly identified as the solution needed to address the customer’s issue and was applied at a problematic discharge location. 225 Force Main Stripper is a super concentrated chemistry designed to be added directly into the lift station and pumped into the force main during normal operation. 225 Force Main Stripper strips the walls of the force main immediately leaving behind cleaned pipes.
Learn more: 225 Force Main Stripper
The first OdaLog graph below in the gallery shows hydrogen sulfide levels at the discharge of the utility before any chemical application. As you can see, hydrogen sulfide averages and spikes were high throughout the 6-day testing period.
After applying 225 Force Main Stripper, Aulick again tested hydrogen sulfide levels at the discharge using an OdaLog. The second graph is also shown below in the gallery.
In summary, 225 Force Main Stripper, in addition to Aulick’s Nitra-Nox and Sul-Fight, was successful in reducing hydrogen sulfide spikes by 75% and hydrogen sulfide averages by 88%. When applied in later summer or warmer months, 225 Force Main Stripper is successful in protecting against hydrogen sulfide odor and corrosion issues.
In this specific case study, 225 Force Main Stripper, in addition to Aulick’s Nitra-Nox and Sul-Fight, was successful in reducing hydrogen sulfide spikes for the utility in Tennessee by 75% and hydrogen sulfide averages by 88%.
Note: 225 Force Main Stripper will perform best if fed at one time. There should be a high concentration of this solution in the lift station at once then pumped into the force main. Consult your Aulick consultant for recommended dosage.