Wastewater Utility Plan

Lower South Platte Regional Group, 
Colorado

Wastewater Utility Plan

Project Highlights: 
  • New wastewater treatment facility.
  • 70-mgd ultimate capacity; 15-mgd first-phase capacity.
  • Extensive permitting requirements.
  • Nutrient removal and effluent filtration.
  • “Good neighbor” design considerations.

The development of the new Denver International Airport (DIA) has spurred significant growth in the northeast quadrant of the Denver metropolitan area. Because the majority of the wastewater generated from this area must be pumped upstream to the Metro Wastewater Reclamation District’s central plant for treatment and disposal, three wastewater entities joined to fund the development of a new regional treatment facility. Carollo evaluated potential sites northeast of Denver.The Lower South Platte Regional Group, comprises the Metro Wastewater Reclamation District, South Adams County Water and Sanitation District, and the City of Brighton, retained Carollo to develop a wastewater utility plan for this facility. Preliminary service area and flow and load projections indicate the ultimate size of the facility could be 60 mgd, with an initial-phase capacity of at least 15 mgd.

As part of a comprehensive planning study, Carollo evaluated potential sites for locating a new regional wastewater treatment facility northeast of Denver.

Work includes a siting study to identify and acquire a 100+/- acre site downstream of Brighton; evaluating treatment process options; assessing biosolids treatment and disposal alternatives, identifying capital, operations, and maintenance requirements; siting and sizing service area transmission infrastructure; and permit acquisition.

Preliminary effluent limits indicate that, in addition to providing conventional treatment, the plant may have to meet ammonia effluent limits as low as 4 mg/L, possible future denitrification with a total inorganic nitrogen (TIN) limit, and a potential future phosphorus limit.

Odor control and “good neighbor” concerns are issues. The project will include a public education and involvement program and the team will consider minimizing negative public reaction and developing informed consent for the new plant as part of the process selection process. It will also be necessary to evaluate biosolids treatment and disposal at the treatment plant site.