Cedar Meats is a state-of-the-art meat exporter in Victoria, with a philosophy of continual improvement. The company needed to upgrade its DAF system, and wanted a more energy efficient system that could deliver low running costs over the life of the system.
A conventional dissolved air flotation (DAF) system consists of a centrifugal pump that pulls clean effluent from the DAF tank and feeds it into a pressurised air saturation vessel. A compressor feeds compressed air into the same vessel and the air saturates into the effluent water. The water is then fed back into the bottom of the DAF tank where the air comes out of solution to form tiny bubbles. These bubbles attach to fats and grease in the system and float it to the top of the tank where it is scraped away.
The system requires a control system to combine the air and water correctly, and it requires regular certification of the pressure vessel. There is also the maintenance of the pump, compressor and pressure vessel to consider, along with energy consumption of both pump and compressor. Capital costs and running costs are not cheap for this “standard” system.
The Chief Engineer at Cedar Meats, Yogesh Mistry was looking for a solution that did not involve intricate and delicate control systems and did not need ongoing Worksafe certification for pressure vessels. He had read a press report on a new DAF pump from German manufacturer Edur, and contacted Hydro Innovations for further information.
The Edur DAF pump is a multistage “multiphase” pump capable of handling a gas/water mixture, making for DAF. The pump draws clean effluent from the DAF tank, and at the same time, draws in atmospheric air on the suction side of the pump. The pump sheers and mixes the air with the water, and under pressure from the multistage pump, air saturates into the effluent water. The water is then pumped into the bottom of the tank, where the air comes out of solution, as in a conventional system, but with no need for a separate compressor or air saturation pressure vessel.
Yogesh Mistry was so impressed with the simplicity of the system that he arranged the purchase and installation of an Edur DAF pump. And the results have been positive.
The new DAF system at Cedar Meats removes solids at a higher rate than the old system, and does it with lower power consumption. The control system is less complicated, and Mistry is looking forward to reduced maintenance costs over the life of the system.
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