State Water Resources Research Institute Program


Project ID: 2012CO266B
Title: Biowin Simulation to Assess Alternative Treatment Units for a Local Wastewater Treatment Plant to Meet the New Effluent Nutrient Regulations
Project Type: Research
Start Date: 3/01/2012
End Date: 2/28/2013
Congressional District: 4th
Focus Categories: Wastewater, Law, Institutions, and Policy, Models
Keywords: Biowin
Principal Investigator: Omur-Ozbek, Pinar
Federal Funds: $ 5,000
Non-Federal Matching Funds: $ 2,400
Abstract: Colorado Department of Public Health and Environment is updating Regulation 31 and creating Regulation 85(3) (to be passed around early 2012) to reduce the nutrient loadings to lakes and streams by wastewater treatment plant (WWTP) effluents. Of the four effluent nutrient tiers, Tier 2 is expected to be the basis for the existing publicly owned treatment works (POTWs) (>1.0 MGD) as the limits can be achieved with conventional biological nutrient removal (BNR) technology. For Tier 2, effluents should not contain total phosphorus and total inorganic nitrogen above 1 and 10 mg/L, respectively. City of Loveland WWTP is selected as the model system for this research. It has a 10 MGD capacity and a conventional step-feed activated sludge process which operates effectively to meet the current regulatory effluent requirements. When the Regulation 85 goes into effect, Loveland WWTP, as well as many other CO WWTPs, will be required to meet the new effluent limitations by the next permit round. Hence it is essential for the WWTPs to proactively look for alternative options to update their treatment systems to meet the new regulations.

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