Nutrient removal is increasingly required for wastewater treatment to prevent eutrophication of receiving waters. Nitrogen and phosphorus are the primary targets.

Why Nutrient Removal Matters

Excess nutrients in discharge cause:

• Algae blooms in rivers and lakes
• Oxygen depletion in streams
• Ecological imbalance
• Regulatory compliance issues

Nitrogen Removal

Biological Nitrification-Denitrification

Two-step process:

1. Nitrification: Ammonia → Nitrite → Nitrate (aerobic)
2. Denitrification: Nitrate → Nitrogen gas (anoxic)

Key Parameters

• Aeration tank DO: 2-4 mg/L for nitrification
• Anoxic zone: DO < 0.5 mg/L for denitrification
• Sludge age: >10 days for nitrification
• Temperature: Rate decreases below 10°C

Phosphorus Removal

Biological Phosphorus Removal (EBPR)

Enhanced biological phosphorus removal uses PAO (phosphorus accumulating organisms) that take up excess phosphorus under alternating anaerobic/aerobic conditions.

Chemical Precipitation

Addition of aluminum sulfate, ferric chloride, or lime precipitates phosphorus as metal phosphates.

Feiran EP Nutrient Removal Systems

We supply complete nutrient removal packages including aeration systems, mixers, and chemical dosing equipment.

Email: sale@yixingenviroequipment.com