How to Control Activated Sludge with Online Sensors

'How to Control Activated Sludge with Online Sensors' delves into the concept of online monitoring and control in water resource recovery facilities. The focus of this white paper is the use of online instrumentation for control of wastewater treatment aeration. 

Activated sludge aeration systems can account for 25 to as much as 60 percent of total plant energy use. Implementation of instrumentation, control, and automation (ICA) is critical to reducing energy consumption for aeration. 


  1. Manual Control
  2. Open Loop Control
  3. Closed Loop Control
  4. On/Off Control
  5. PID Control
  6. Direct and Cascade  Control Based on DO  and Ammonium
  7. Barriers to PID  Control
  8. Feed Forward Control
  9. Aeration Control Cost/Benefit Example

The goal for domestic wastewater treatment in the 21st century should be to have a minimal carbon footprint and to be 100% self-sustainable with regards to energy, carbon, and nutrients – while achieving a discharge or reuse quality that preserves the quality of receiving waters (Water Environment Research Foundation (WERF), 2009). 

The best strategy for a facility must take into consideration several factors including the characteristics of the wastewater, discharge limits, and the treatment process. Let our white paper help you. Download for free now!


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