Online monitoring of oxidation reduction potential (ORP/Redox) in water resource recovery facilities, provides valuable feedback on the status of biological nutrient removal. An ORP sensor is most similar to a pH sensor in design and function but more similar to a dissolved oxygen sensor in application.
The understanding of ORP is less intuitive than DO because it is a relative measurement. However, the benefit of ORP is that it provides much greater resolution of the conditions in the reactor at very low DO concentrations.
For example, monitoring the value of, and the change in, ORP allows determination of the endpoints of nitrification and denitrification and when suitable conditions exist for phosphate release, a critical step in the Enhanced Biological Phosphorus Removal (EBPR) process.
In addition to applications, ORP measurement principles and proper ORP sensor maintenance and calibration can be learned from the SlideShare presentation below.
If you would prefer to watch our recording of our ORP webinar, you can view it now.
Additional Blog Posts of Interest:
Wastewater Aeration Control - Energy Cost Savings Examples
Myths and Realities: Ammonium Based Aeration Control in Wastewater
Shortcut the Nitrogen Removal Process in Wastewater with UV Sensors
Troubleshooting Nitrification and Denitrification in Wastewater