Gas recovery is a good idea but it isn't cheap. DCWater has installed a Cambi system in their wastewater plant and it generates about 1/3 of their plant electricity  needs. However, it cost upwards of 300 million USD.

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Gas recovery is a good idea but it isn't cheap. DCWater has installed a Cambi system in their wastewater plant and it generates about 1/3 of their plant electricity  needs. However, it cost upwards of 300 million USD.