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New Orleans' Experience in Usage of Bio–stimulant in their Wastewater Collection System to Reduce BOD5 and Control Odor/Corrosion

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Abstract:

The City of New Orleans has been using Bio-Kat, a patented cellular bio-activation liquid additive, to control hydrogen sulfide odor in their West Bank Water Treatment Plant since July 7, 2006. Prior to the introduction of Bio-Kat, the City was using hydrogen peroxide to control the hydrogen sulfide odor. Although odor is the dominant public concern, sulfide reducing bacteria and hydrogen sulfide also play a leading role in the corrosion of both cement and iron pipes and force mains. Bio-Kat reduces hydrogen sulfide production by increasing the metabolic activity of aerobic microorganisms in the wastewater keeping the ORP greater than 100 mv while above the –250 mv to initiate anaerobic activity diminishing corrosion in pipes and force mains.

The New Orleans West Bank wastewater treatment plant receives an average flow of 11.8 MGD, and receives 11 gallons Bio –Kat liquid per day on a time release drip system. Hydrogen sulfide concentrations have been monitored since May 18, 2006 (two months prior to Bio-Kat introduction) at the West Bank Water Treatment Plant. The data show a significant decrease in hydrogen sulfide levels after the two month Bio-Kat acclimatization period (June 28, 2006- August 31, 2006) as well as a continual decline in hydrogen sulfide levels with long term Bio-Kat use. The hydrogen sulfide levels dropped from 3.55ppm using hydrogen peroxide to 2.51ppm in 2006 using Bio-Kat, t =7.475, p =0.000, which was a 29.22% reduction in hydrogen sulfide. In 2007 mean levels of hydrogen sulfide declined again to 0.34ppm and 0.24ppm in 2008. This level appears to be at an equilibrium of around 0.3 ppm of hydrogen sulfide for 2009 and 2010. Hydrogen sulfide levels peaked at 51ppm using hydrogen peroxide in 2006 and decreased to 36ppm using Bio Bio-Kat in 2006. Peak concentration for 2007 was 6ppm, 4ppm in 2008, 3ppm in 2009 and 2ppm in 2010.

Additionally, lower influent BOD by 25 percent, degradation of collection system fats, oil and grease and decreased sludge production has been observed with the use of Bio Bio-Kat in the Hollywood Florida and New Orleans West Bank wastewater treatment plants. By utilizing the hydrogen peroxide control, the cost of the system was estimated to be 8.45 million dollars a year to reduce the hydrogen sulfide levels to 3.55 mg/L, yet by using Bio Bio-Kat, the cost of the system is 0.6 million dollars per year to reduce these levels to 0.26 mg/L. This estimate represents a 7.85 million dollars saving due to corrosion damage per year.

Keywords: Bio-Kat; five day biological oxygen demand (BOD5); hydrogen sulfide; oxidation reduction potential ( ORP)

Document Type: Research Article

DOI: https://doi.org/10.2175/193864711802764913

Publication date: 2011-01-01

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