Now Offering – Single Tank Continual Sequencing Reactor
Biological Nitrification, Denitrification and Phosphorus Removal Using ORP and DO sensors in Activated Sludge and SBR treatment basins.
As influent enters the basin, activated sludge provides the necessary bacteria or biomass for the biological reactions that result from manipulation of the of the oxic, anoxic and anaerobic phases. The changes between phases are automated based on real-time DO and ORP readings.
During the oxic stage, the blowers add sufficient oxygen to the mixed liquor to obtain a DO value of 2.0 ppm. During this time when the DO is high, the ORP increases to a predetermined set point and turns the blowers off. During the oxic stage, nitrification occurs, converting ammonia-nitrogen to nitrate-nitrogen and water.oxic, anoxic and anaerobic phases. The changes between phases are automated based on real-time DO and ORP readings.
After the blowers shut off, the process enters the anoxic stage and DO drops to an undetectable amount. During this time, the nitrate nitrogen reduces to nitrogen gas releasing oxygen which is then available for the respiration of the denitrifying organisms.
When there is no free oxygen remaining the basin enters the anaerobic stage, and heterotrophic bacteria become stressed and release orthophosphate. At a low enough ORP level, the system triggers the blowers and free oxygen is reintroduced into the basin.
The basin returns back to an oxic state and the stressed bacteria reattach with orthophosphate, but at a higher level than that prior to the anaerobic stress. Phosphorous is then removed when biomass is wasted.
If you are interested in learning more about how our Automated ORP Systems can benefit your wastewater treatment facility, or to inquire about how to get started, please complete the form on the “Contact Us” Page. Include your name and email address, and in the comments section be sure to include the important details about your current system as well as what you’d like ORP to do for you! We will be in touch soon to further assist you.