Systems and processes for producing fixed-nitrogen compounds

A method for producing nitrates, nitrites, nitric acid, salts thereof, or a mixture thereof, the method comprising:

• producing an effluent stream comprising one or more oxidized nitrogen species from using a plasma reactor, the plasma reactor producing the one or more oxidized nitrogen species by producing a plasma comprising nitrogen and oxygen from an inlet stream comprising nitrogen and oxygen;
• producing one or more of NO, NO2, nitric acid, nitrates, nitrites, salts thereof, or a mixture thereof from the effluent stream comprising the one or more oxidized nitrogen species using an absorber;
• removing at least a portion of the one or more oxidized nitrogen species from the effluent stream using the absorber, such that the absorber produces a gas phase stream and a liquid phase, wherein the liquid phase comprises the produced nitrates, nitrites, nitric acid, salts thereof, or a mixture thereof;
• combining the gas phase stream produced by the absorber with a feed stream comprising air;
• pressurizing the combined gas phase stream produced by the absorber and the feed stream to a pressure from 1 psig to 10 psig using a first blower or a first compressor;
• and
• recycling the combined gas phase stream produced by the absorber and the feed stream to the inlet stream, such that the inlet stream comprises the gas phase stream produced by the absorber and the feed stream.