Wastewater Treatment - General Information
Project construction was completed in May, 2013 for:
- an ultraviolet (UV) disinfection system that will replace the chlorine / sulfur dioxide disinfection system;
- digester modifications; and
- headworks modifications.
The Nutrient Compliance Study finalized early in 2013 looks ahead to determine how the City of Boulder may comply with more stringent future wastewater discharge regulations, including:
- daily maximum nitrate and ammonia limits (effective December 2017);
- Colorado Regulation 85: Technology-based nutrient limits (effective approximately 2022); and
- Colorado Regulation 31: Water quality-based nutrient limits (effective approximately 2030).
The one-megawatt solar electric system at the Wastewater Treatment Facility has generated more than three million kilowatt-hours of energy, saving city ratepayers more than $75,000.
The 75th Street Wastewater Treatment Facility is designed to treat more than 25 million gallons per day of wastewater from the City of Boulder, including the Gunbarrel area.
- Currently, it treats approximately 12.5 million gallons per day and discharges a high-quality effluent to Boulder Creek.
Wastewater is treated using several different treatment processes, including:
- chemical; and
- Treated wastewater (effluent) is discharged to Boulder Creek just east of 75th Street.
- Many samples are collected from the effluent discharge to ensure that the discharge is meeting or exceeding the permit that has been issued by the State of Colorado.
- The City of Boulder is regulated under permit number CO-0024147 issued by the Colorado Department of Public Health and Environment (CDPHE).
The Industrial Pretreatment Program is also located at the city's wastewater treatment facility.