Frontier Re?ning, Inc., Cheyenne, Wyoming entexinc.com/installations/frontier/ In August of 2006 the wastewater treatment plant (WWTP) for the Frontier Oil Re?nery in Cheyenne, Wyoming received a new e?uent discharge limit that required greater ammonia removal than the plant had historically been able to maintain. The existing WWTP had been unable to sustain MLSS concentrations high enough to maintain the required SRT in the bioreactors. A combin

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