Many operators monitor DO in the aeration tank and believe the system is healthy.

But in industrial MBBR systems, bulk DO and biofilm DO are often completely different things.

This is especially true in:

• High COD wastewater
• High ammonia wastewater
• High viscosity wastewater
• Saline industrial effluent

The outside water may show 3–4 mg/L DO, while the inner biofilm layer is already oxygen-limited.

When this happens, several hidden problems begin:

• Nitrification efficiency drops
• Nitrite accumulation appears
• Biofilm turns excessively thick
• Anaerobic zones develop inside the carrier
• Sludge shedding increases

Many people blame the blower capacity.
But in reality, the issue may come from:

✔ Media geometry
✔ Fill fraction
✔ Mixing intensity
✔ Bubble distribution
✔ Carrier movement pattern

Industrial wastewater requires stronger oxygen penetration than municipal sewage because the biological load is much more aggressive.

This is why carrier design becomes critical.

A well-designed MBBR carrier should not only provide surface area — it must also maintain efficient oxygen diffusion throughout the biofilm lifecycle.

In industrial MBBR, aeration is not only for oxygen supply.
It is also a biofilm thickness control mechanism.

#MBBR #IndustrialWastewater #WastewaterEngineering #Aeration #BiofilmTechnology #WaterIndustry