Varifrån kommer kvävet?
Citat:
Coal and oil, two major fossil fuels, contain nitrogen. When these fuels are burnt to generate electricity, the produce a type of NOx known specifically as fuel NOx. As well, there is another type of NOx known as thermal NOx which is produced when atmospheric nitrogen and oxygen recombine under high temperatures (such as in the flame of fossil fuel combustion) to create NO. The combustion of coal and oil produces both thermal and fuel nitrogen oxides, while natural gas combustion produces only thermal NOx. As well, uncontrolled oil or coal combustion produces more nitrogen oxides than the combustion of natural gas.
Citat:
After combustion, either selective catalytic reduction or selective non-catalytic reduction processes can be used to reduce nitrogen oxide emissions.
http://energyeducation.ca/encyclopedia/Nitrogen_oxide
Naturgas?
Citat:
Burning natural gas does produce nitrogen oxides (NOx), which are precursors to smog, but at lower levels than gasoline and diesel used for motor vehicles. DOE analyses indicate that every 10,000 U.S. homes powered with natural gas instead of coal avoids the annual emissions of 1,900 tons of NOx, 3,900 tons of SO2, and 5,200 tons of particulates.
http://www.ucsusa.org/clean-energy/c...of-natural-gas
Det finns "scrubber systems" för att rena industriutsläpp från olika typer av föroreningar (innan utsläppen sker i skorstenar):
Citat:
Scrubber systems (aka Chemical Scrubbers, Gas Scrubbers) are a diverse group of air pollution control devices that can be used to remove some particulates and/or gases from industrial exhaust streams.
https://en.wikipedia.org/wiki/Scrubber
