Presentation Abstract

Wisconsin winters can create significant operational difficulties, and wintertime process failures are difficult to correct. This presentation is intended to identify problems common in biological treatment systems that experience significant temperature swings and provide useful strategies for minimizing the impact of these problems. This presentation will focus primarily on nitrification and seasonal foaming, but it will also address sludge production, storage of out-of-service tanks, and potential holiday-related upsets. The relationships between wasting strategies and wintertime process failures will be discussed in detail along with the basics of nitrification theory.