Did you know that the much of the wastewater in Hamilton is treated in a plant that partially powers itself? If you go down to the Woodward Avenue wastewater treatment plant, you will see what looks like a big globe. This is where the action takes place.
In this sphere, bacteria are digesting waste products in an anaerobic (without oxygen) environment. The bacteria break down pollutants into methane. The methane is transported to a generator and burned to create power. The plant produces 1.6 MW of power every day and offsets about a fifth of the wastewater treatment plant's total daily load. For more information, visit this fact page from the Ontario Power Authority or this paper describing some of the challenges that had to be overcome.