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INVESTIGATION OF NITRIFICATION UPSETS AT THE AMERICAN BOTTOMS REGIONAL WASTEWATER TREATMENT FACILITY

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Abstract:

INTRODUCTION

This American Bottoms Regional Wastewater Treatment Facility is an activated sludge based treatment process that receives approximately 70% of its organic load from industrial sources. The plant consists of primary clarifiers, an activated sludge process that can be operated as a PACT process, secondary clarification and disinfection by chlorination. The plant treats a heavily industrialized wastewater from a variety of industrial sources which contribute metals, ammonia, organic nitrogen, chloro and nitroanilines, chloro and nitrophenols and other organic compounds. Much of the industrial load is pretreated at a centralized pretreatment facility referred to as the PChem plant which provides oil removal, acid neutralization, metals precipitation and clarification. The PChem effluent enters the American Bottoms plant upstream of the activated sludge process where it is blended with the primary effluent before receiving biological treatment. A significant element of the plants operation is providing nitrification. Historically the plant received influent wastewater ammonia concentrations of up to 200 mg/L. Local limits were developed to significantly reduce the ammonia loads through source controls. Now the plant receives ammonia levels of 10 to 30 mg/L but also receives organic nitrogen concentration up to an additional 50 mg/L or TKN concentrations up to 80 mg/L. The plant is generally successful in maintaining nitrification; however, there have been three instances of significant upsets. The subject of this paper is the investigation of these upsets.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864705783858756

Publication date: 2005-01-01

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