Proper dissolved oxygen (DO) control is critical for efficient activated sludge process operation, directly impacting treatment efficiency and energy consumption.

Why DO Control Matters

DO levels affect:

• Microbial activity and substrate utilization
• Energy consumption (aeration = 50-70% of plant energy)
• Nutrient removal efficiency
• Sludge settleability
• Operating costs

Target DO Levels

• Aerobic zone: 2.0-4.0 mg/L
• Anoxic zone: 0.2-0.5 mg/L
• Anaerobic zone: <0.2 mg/L

DO Control Strategies

Manual Control

Operator adjusts aeration based on periodic DO measurements. Simple but labor-intensive and reactive.

Timer-Based Control

Aeration adjusted based on time-of-day patterns. Better than manual but doesn’t respond to load variations.

Feedback Control

DO sensors trigger adjustments when levels deviate from setpoint. Responds to process changes.

Advanced Control (DO Profile)

Multiple DO sensors along aeration tank allow zone-based control. Optimizes aeration based on actual oxygen demand.

Energy Savings

Proper DO control can reduce aeration energy by 20-40% compared to continuous full aeration.

Feiran EP Solutions

We supply DO monitoring equipment and control systems for wastewater treatment optimization.

Email: sale@yixingenviroequipment.com