Meeting/Event Information

Adaptive Mixing Leads to Better Biological Nutrient Removal

February 03, 2021
9:00 AM - 10:00 PM
 Add to Calendar



With the increased demand for biological nutrient removal (BNR) at wastewater treatment facilities, the demand for slow mixing has increased. In addition to needing mixers, operators are discovering that treatment results can be optimized by controlling the timing and speed at which they mix. The introduction of adaptive mixers has made this control not only possible but also programmable.
This presentation will review the processes involved with biological nitrogen and phosphorus removal in wastewater. The role and need for mixers will be reviewed with regard to each process. The concept of adaptive mixing will then be introduced along with suggestions on what parameters to monitor within the treatment processes to make mixer speed automation possible.
Finally the results from a study at Milwaukee Metropolitan Sewerage District will be presented. In this study, various mixer run times were evaluated to determine the optimal run/rest sequence for phosphorus removal. By studying the phosphorus release in the anoxic zone, it was determined that by not mixing 11.5 hours and running the mixers only 0.5 hrs per day in the anoxic basins, phosphorus removal was increased.


$0.00 Member Registration

$0.00 Non-Member (without membership) Registration