Application Note: Dissolved Oxygen Measurement in a Wastewater Treatment Plant
Monitoring dissolved oxygen is an important part of the activated sludge process. It assists in ensuring that there is sufficient dissolved oxygen in the process for the biological activity to take place, and helps to optimize energy usage through controlled air addition. In some cases, aeration accounts for between 2% and 3% of their annual energy costs. Maintaining a proper level of dissolved oxygen can only be accomplished by using an on-line instrument that will accurately and continuously measure the dissolved oxygen concentration at the various stages throughout the treatment process.