After spending millions of dollars for a system upgrade, the Wooster (Ohio) Water Pollution Control Plant was regularly violating its effluent permit. It had more solids — not less as planned. The digesters could not handle the extra load, and there wasn’t enough biogas to run the new generator.After finding the right partner, the plant is now in full compliance and saves hundreds of thousands of dollars a year by producing enough electricity to power itself along with the city’s water treatment plant.Upgrade goes badWith a population of 27,000, Wooster is served by a combined sewer system and a treatment
