Union owns and operates a petroleum refinery located in
Lemont in Will County with a rated capacity of 150,000 barrelsof crude oil per day, almost all of which is sour crudewhich is high in nitrogen content and contributes to the highammonia nitrogen levels in its wastewater discharge.
It has achieved a 72
reduction in the ammonia nitrogen concentration of its treatedeffluent water since 1973 through source control, upgradingfacilities and applied reseach on treatment techniques.
The
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