Transforming Nutrient Removal in Water Resource Recovery Facilities (WRRFs) through Suboxic / Low DO Treatment
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Associated Project
Several strategies can optimize aeration to reduce energy consumption, including operating aeration basins at “low dissolved oxygen (DO)” levels. Suboxic nutrient removal (SNR) (DO <0.7 mg/L) has the potential to enhance nutrient removal performance and save energy.
This expert-led webcast series is designed for wastewater professionals looking to deepen their understanding of BNR processes operated with minimal aeration. Consisting of three 1-hour sessions, this series will provide a fundamental overview of low DO/suboxic BNR, design considerations, and first-hand experience from a full-scale demonstration performed at the Los Angeles County Sanitation Districts Pomona Water Reclamation Plant (PWRP) as part of WRF project 5148.
The first webcast will review low DO and SNR operations in the United States, drivers, challenges, and what is known to date about the microbiology and adaptation to suboxic conditions. The second webcast in the series will focus on aeration infrastructure requirements and modification options for successful low DO/SNR operation. Design considerations and metrics will be discussed and evaluated with case studies. The third webcast in the series will highlight the full-scale demonstration at PWRP. PWRP successfully transitioned from average DOs of 2.0 mg/L to 0.8 mg/L and reduced aeration energy consumption from 1400 kWh/MG to 650 kWh/MG while maintaining nitrification. This webcast will systematically walk through the process and control changes used to transition to lower DOs at the plant. Energy savings, process performance, and microbial acclimation and kinetics will also be discussed. These webcasts are relevant to facilities around the United States facing budget constraints, sustainability goals, and more stringent nutrient limits.
Presenters:
Daniel R. Noguera, PhD, Wisconsin Distinguished Professor, Department of Civil and Environmental Engineering, University of Wisconsin - Madison
Tanja Rauch-Williams, PhD, PE, Chief Innovation Officer, Metro Water Recovery
Moderator:
Jeff C. Moeller, PE, Director of Research Services, The Water Research Foundation