Model BFL 5000FG - Biological Degradation Brochure

The main problem with the effluent from dairies is the large amounts of animal fats present. These cause major problems by coating drains, pumps, pumping stations, inlet screens and primary clarifiers. In many activated sludge plants excessive quantities of fat can give rise to Nocardia foaming which causes major operational problems. While the bulk of the fats/grease is removed in Dissolved Air Flotation (DAF) units or grease interceptors the remainder must be treated in the wastewater treatment system. Other components of the effluent such as proteins and lactose contribute to an effluent with a high BOD. The seasonal nature of the dairy industry results in high loads and flows, particularly in spring/early summer.