Dairy processing — milk, cheese, butter, yoghurt and milk powder — produces wastewater high in lactose, milk fats and proteins, giving very high BOD and COD. Frequent clean-in-place cycles add caustic and acidic loads that swing the pH, and milk fats contribute FOG. MBBR handles this strong, variable stream well because the fixed biofilm tolerates the load and pH swings that come with dairy operations.
Dairy-specific Considerations
Lactose and proteins are readily biodegradable, so MBBR achieves high organic removal. FOG from milk fats should be reduced upstream to protect the carriers. The pH swings from cleaning chemicals are best managed with upstream equalisation and, where necessary, pH correction so the biofilm sees a stable environment. Because the load is very high, dairy MBBRs are often staged, with a roughing stage taking the bulk of the organics.
Where dairy loads are extremely concentrated, anaerobic pretreatment ahead of the MBBR can remove bulk COD economically before aerobic polishing.
Dairy Wastewater Design Context (indicative literature ranges — confirm per project)
| Parameter | Typical Value | Unit | Notes |
|---|---|---|---|
| Dominant load | very high BOD/COD | — | Lactose, fats, proteins |
| FOG | reduce upstream | — | Milk fats |
| pH variability | CIP-driven | — | Equalisation / pH correction |
| Pretreatment | optional anaerobic | — | For very high COD — confirm per project |
A Robust Fit for Dairy Plants
The high biodegradability of dairy organics combined with the resilience of a fixed biofilm makes MBBR a dependable choice, whether treating to discharge consent or as a roughing stage ahead of a municipal sewer.
Frequently Asked Questions
Why is dairy wastewater so strong?
How are pH swings from cleaning managed?
Is anaerobic pretreatment used for dairy?
Related Pages
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