The main emission that comes from wastewater treatment facilities is Nitrous Oxide gas. It is actually a stronger greenhouse gas than CO2 by about 300 times. The reason that they produce so much is because in an attempt to make the water safer by taking out ammonia, they have to produce nitrogen gas and nitrous oxide. In ideal situations they would only produce nitrogen because it comprises 78.8% of our atmopshere and is essentially harmless as pure nitrogen. The facilities also produce CO2, but for the most part nitrous oxide is the main emission.
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