LITTLETON ENGLEWOOD, COLORADO
The Littleton Englewood Wastewater Treatment Plant (LEWWTP) was founded in 1977 as a pure oxygen activated sludge plant, and is the third largest publicly owned treatment works in the state of Colorado. The plant receives sewage from Littleton and Englewood, as well as 21 smaller districts in the service area. In 2009, a $110 million construction project was completed which transformed the plant into a fifty million gallons per day (mgd) trickle filter/solids contact facility with post nitrification and post denitrification capabilities. The large advanced treatment plant is required to exceed secondary treatment requirements and remove ammonia from wastewater, working in compliance with local, state and federal regulations applicable to wastewater treatment and discharge.
Objective: Online Monitoring of Ammonium and Nitrate Helps Facility Meet Strict Discharge Limits
Check out the Littleton Englewood story in the following video: http://bit.ly/IQSNcolorado
The Challenge Daily maximum discharge limits for ammonia and total inorganic nitrogen (TIN) require exceptional performance at the LEWWTP. Operators needed a solution for monitoring and controlling nitrification and denitrification in real-time across their multiple- stage biological process. The Solution Online process monitoring is a key element of the LEWWTP process control strategy. The IQ SensorNet 2020 XT system from YSI was selected because it provided the most accurate results and involved the least amount of operator attention in side-by- side trials with competing dissolved oxygen monitoring systems. Furthermore, operators recognized that the network configuration and modularity of the equipment meant that the monitoring system could be easily expanded to help them solve problems with nitrification and denitrification. By continuously measuring the amount of ammonia in the aeration basin, the team is able to monitor the contribution of ammonia from the return of anaerobic sludge dewatering centrate to the aeration basin. An ammonia concentration target is entered into the SCADA system and the centrate pump output is varied to attain the desired concentration in the aeration basin. By monitoring and controlling the amount of ammonia present, the ammonia loading to the nitrification process is kept within target ranges, which improves efficiency in the conversion of ammonia into nitrate.
IQSN sensors in effluent
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