Problem

At Danish Crown (a large Danish slaughterhouse), three existing dissolved air flotation (DAF) units, each treating 40 m³/h of wastewater, had been in operation for many years and no longer delivered optimal performance. The ageing dispersion of water systems resulted in inefficient removal of fat, oil and grease (FOG) and suspended solids, while consuming more energy than necessary. This reduced overall treatment efficiency and increased operating costs.

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Solution
BioAqua upgraded the three DAF units at Danish Crown by installing a new dispersion water system based on microbubbles. This upgrade included replacement of the old equipment with our special NIKUNI pumps and our patented injection nozzles, enabling a much more efficient dissolution and distribution of air in the flotation tanks. This approach transformed the existing DAF units into high-performance flotation systems without the need for extensive civil works, keeping investment and installation time to a minimum.

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Result

The upgraded DAF units achieved approximately 20% lower energy consumption and about 30% additional sludge removal, significantly improving the removal of fat, oil and grease, TSS, COD as well as BOD. The new system has smaller space requirements than many older aeration systems. It is simple and robust in daily operation, with low maintenance requirements for Danish Crown’s staff. 

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Overall, the solution strengthened the slaughterhouse’s wastewater treatment performance and reduced operating costs, while extending the lifetime and capacity of the existing flotation units.