DOUBLE TAKE/A Wisconsin plant optimizes secondary treatment to maximize its wet weather capacity

摘要

It's a hot, humid July day n southeast Wisconsin. At the Henry Maier Festival Park on the shores of Lake Michigan, Crowds are building at Summerfest, Milwaukee's annual 11-day music festival. Inside the park, people are strolling, basking in the summer sun, enjoying music and entertainment acts, sampling local food favorites, and forming lines at the Marcus Amphitheater in anticipation of the evening's headlining performer. A few hundred yards south of the amphitheater, just across the mouth of the Milwaukee River, all appears quiet at the Jones Island Wastewater Treatment Plant. This advanced secondary treatment plant is one of the nation's oldest activated sludge plants and deemed a historical civil engineering landmark by the American Society of Civil Engineers (Reston, Va.). The plant treats up to 1.2 million m~3/d (330 mgd) of separate and combined sewer wastewater. Beneath the calm, however, the plant's supervisory and operating personnel are on alert. That know that weather is ripe for fast-forming thunderstorms that can create high flows