Biological nutrient removal (BNR) is an essential secondary treatment process used in many Water Resource Recovery Facilities (WRRFs) to remove nitrogen (N) and phosphorus (P). Traditional activated sludge processes are effective at transforming ammonia to nitrate but usually operate at high dissolved oxygen (DO) concentrations greater than 2 mg/L. While effective, plants operating at higher...

  Hear from the CWEA Engineering and Research award winners on their projects that won first place this year. Engineering Achievement of the Year: City of Paso Robles Wastewater Treatment Plant “Tertiary Treatment Facilities Project and Nutrient Harvesting System” In 2019, the City of Paso Robles completed two projects at its wastewater treatment plant. One...

From the San Francisco Bay RWQCB Region 2…. The San Francisco Bay Regional Water Quality Control Board updated its regulations on nutrient discharges into the San Francisco Bay watershed on Wednesday to protect the watershed from harmful effects of discharges from municipal wastewater treatment plants and other sources. Although San Francisco Bay is not impaired...