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Facility Name:
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Burlington Main
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Matthew Dow, Wastewater Facilities Manager
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City of Burlington
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Burlington Main Wastewater Treatment Facility
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05/29/2020
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05/29/2020
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08:30 pm to 09:20 pm
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Discharged treated and partly disinfected effluent
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Approximately 1.4 Million Gall
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Chem Feed Problem
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WWTF outfall
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The operator on duty was on site when the alarm came in. The operator on duty immediately started to trouble shoot the disinfection system. Based on earlier checks of the hypo tank level and typical tank draw down rates, lack of hypo due to an empty tank was not checked until later in the trouble shooting process. Thus about 20 minutes passed between the initial low disinfectant alarm in the contact tank and discovering that the cause was the empty tank. The operator immediately switched tanks and restored the chemical feed. Given normal lag times, it took an additional 10-15 minutes for disinfection to be fully restored. In total, inadequate disinfection was occurring for about 50 minutes total, which includes the initial lag in the time it took for the tank to empty and for disinfectant levels to drop to alarm level in the contact tank.
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Lake Champlain
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Megan Moir, Div Head Water Resources
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nForms
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Y
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5.29.2020 had a massive rain storm come through bringing multiple bands of rain that hit the City of Burlington. Staff were on site running a wet weather event cause by the rain. During that period the active disinfection tank prematurely ran out of sodium hypochlorite. While still being investigated, it appears the disinfection system was pumping sodium hypochlorite at a higher rate than the dosage was set to, leading to the tank being drawn down much faster than it should have been.
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HP0-4KYJ-674PG
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