SECTOR
Dairy
Common Characteristics of Wastewater from the Dairy Sector
COD (Chemical Oxygen Demand):
High due to the presence of biodegradable organic matter, proteins and fats from milk and whey handling and processing.
BOD5:
High due to the organic load present in the wastewater.
TKN (Total Kjeldahl Nitrogen):
Can be significant due to the presence of proteins of animal origin.
TSS (Total Suspended Solids):
Present in varying concentrations, depending on the milk processing plant process and operations.
Oils and Fats:
Coming from equipment and utensil washing processes, as well as from the milk by-products.
Purification Performance:
Parameter | Inlet (mg/l) | Outlet (mg/l) | Effectiveness |
COD | 10.500 | <125 | > 99.0 |
BOD5 | 8,500 | <25 | > 99.0 |
TKN | 220 | <10 | > 95.0 |
TSS | 450 | <35 | > 98.0 |
Oils and fats | 450 | <3.5 | > 99.0 |
How do we apply this to your company?
Recommended Treatments:
Aerated Screening and Homogenisation:
Removing coarse solids and laminating and homogenising flows.
Physico-chemical Treatment by Flotation:
Flotation can be used as an initial physico-chemical treatment to remove suspended solids, fats and oils present in the water.
Treatment of Slurries and Sludge:
By storage and/or dewatering by mechanical means (dewatering screws and centrifuging).
Biological Treatments:
After physico-chemical treatment, the wastewater passes through a biological nitrification-denitrification process. In this process, aerobic microorganisms break down the organic matter present in the wastewater, using oxygen to metabolise the contaminants and transform them into more stable products. Activated sludge, SBR (sequencing batch reactor) or MBR (membrane bioreactor) systems.
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