Eli5, Why do landfills merely burn off ex bytra gas into flames, why can’t they generate electricity or something with that gas?
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Lots of answers discuss how some do use gas capture systems but no answers as to why it’s relatively rare.
Gas from landfills and waste treatment plants is not pure methane. There are other contaminants like water vapor and Hydrogen Sulfide that need to be separated. Hydrogen Sulfide becomes sulfuric acid in the presence of water so it’s very corrosive. You need specialized equipment.
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