mqdefaultBy using a German built EDUR DAF pump, businesses with wastewater treatment systems can save on capital cost, as well as energy and maintenance costs.

According to EDUR pump distributor, Hydro Innovations, a single DAF pump can replace the entire air bubble system on Dissolved Air Floatation (DAF) plants. Its EDUR® multiphase pumps draw in air through a “snorkel” in the suction line, sheer the air, then feed it into the DAF plant, producing a discharge stream into the tank that is saturated with 30 to 50 micron air bubbles.

A conventional DAF system consists of a wastewater tank, compressor, air saturation vessel, and pump. The effluent pump draws effluent from the tank and pumps it into the air separation vessel. A compressor pumps air into this same vessel.

The air/water mixture is saturated under pressure, then released back into the wastewater tank at atmospheric pressure where the air comes out of suspension and tiny bubbles form. These then adhere to the suspended matter such as fats, oils and other small wastewater particles. The bubbles, with their attached suspended matter, float to the surface of the tank, where floatables can be skimmed off the surface.

edur-dafBy using EDUR® multiphase pumps, which can produce their own micro-bubbles, asset owners can do away with the compressor, the air saturation vessel and any control and/or ancillary components for these items. The reduction of these system components and the simplification of the system design results in lower investment costs and higher operational reliability.

The EDUR® multiphase (DAF) pump is also an efficient alternative. Energy costs (as well as maintenance costs) of running the compressor are eliminated. There is also no need for constant re-certification of the air saturation vessel, because it is not required in the EDUR system.

EDUR® multiphase pumps can deliver flows from one litre per second for smaller DAF plants to 15 litres per second for larger DAF plants, and produce pressures to 12 Bar. A variety of materials and seal arrangements enable EDUR pumps to operate in a very wide range of applications. Available materials include ductile iron, gunmetal bronze, stainless steel and super duplex. Mechanical seals available as balanced, double and tandem.

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This partner content is brought to you by Hydro Innovation. For more information, call 02 9898 or email

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