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The Mahanoy City Sewer Authority's wastewater treatment plant in Schuylkill County, Pennsylvania experienced effluent limit violations related to disinfection failures during facility upgrades, caused by incomplete nitrification and acidic influent waters that suppressed chlorine effectiveness. The Pennsylvania Department of Environmental Protection provided technical assistance and recommended adding magnesium hydroxide alkalinity to improve biological nutrient removal, with monitoring conducted from August through October. The evaluation found that alkalinity supplementation improved treatment plant performance and nitrification/denitrification processes functioned optimally during the assessment period.
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