PMSL's Biological Nutrient Removal System (BNR)

The Philadelphia Mixing Solutions HALO™ System provides efficient and true biological nutrient removal (BNR) that you can count on! Philadelphia Mixing Solutions' HALO™ System with BNR/ANOX™ draws on 50 years of mechanical and process knowledge. The HALO™ System is an integrated process that combines proprietary mechanical aeration technology and BNR capabilities.

Nitrification a two-step reaction occurring in the oxidation basin. The first step is oxidation of ammonia-nitrogen to nitrite-nitrogen. The second step is the oxidation of nitrite-nitrogen to nitrate-nitrogen. Nitrification requires the presence of dissolved oxygen and Autotrophic micro-organisms.

De-Nitrification an anoxic process involving the biological reduction of nitrate-nitrogen to nitrogen gas. De-Nitrification is the utilization of organic matter by Heterotrophic bacteria using nitrate-nitrogen as the oxygen source.

Biological Phosphorous Removal an anaerobic process. This means that neither free oxygen nor nitrate-nitrogen is present. Under these conditions the micro-organisms' ability to metabolize organic matter is severely hindered. However, phosphorous accumulating micro-organisms are able to transport soluble organic matter across the cell membrane and store it until they are removed from the process as a component of the waste activated sludge in the secondary clarifiers.

In order for the above processes to be optimized it is imperative the reactor configuration and mixing system be optimized to insure that homogeneity of micro-organisms and sufficient residence time for the processes to take place. Philadelphia Mixing Solutions has the knowledge and experience to design BNR systems for our HALO Oxidation Ditch System as well as conventional activated sludge plants.