US Nitrogen Permit Amended

By Walter F. Roche Jr.

Tennessee environmental regulators have amended the operating permit of a Greene County chemical firm changing the method of determining compliance with state emission limits.
The recent amendments to the permit for US Nitrogen LLC comply with a request from company officials submitted to the Tennessee Department of Environment and Conservation in January.
The Midway company had requested the changes based on performance tests conducted in late July.
Under the amended permit maximum levels are set for the amount of ammonia fed into the company's two ammonia trains.
Under the original permit, issued in 2016, the state set limits on the number of burners allowed to operate on the two ammonia trains.
The amended permit includes a range of ammonia injection rates for each Selective Catalytic Reduction unit on the two trains that can be used to assure compliance with nitrous oxide limits.
Under the new permit the emissions of nitrous oxides are capped at 15 tons during any consecutive 12 month period.
The permit also caps the output of ammonium produced at 73,000 tons in any 12 consecutive month period.
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