Hydraulic Coolers, Pressure Line Filters, Air & Bio Gas Compressors / Vacuum Pumps / Blowers, Rotary Lobe Pumps

Diffusers; Technical Information

Please find below information about installation, construction, cleaning and oxygen transfer performance.

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Installation notes

The diffuser requires an air blower or compressor, to drive the system. The system pressure required depends upon the depth of the water & system losses. Positive displacement 100% oil free blowers are usually the best solution.

The air blower should be located adjacent to the air diffusers.

If plastic pipe is used, then the first 6 meters of pipe work should be metal in order to bring the air temperature down to at least 90 deg C in the plastic pipe.

In lakes and lagoons, make an air ring main and come off the ring main with ½” flexible hose, fit a diffuser on the end of the Hose, and then simply drop the diffuser into the liquid.

Construction

The diffussers are manufactured from a very heavy duty polyester fabric tube, a nylon distributor hose runs dowm the centre of the tube.  Between the nylon hose and the polyesther tube there is ballast comprising of spherical gless beads.

The diffusser is banded using 316 stainless steel (covered ina sheath) compressed on to the nylon inner tube with a nitrile rubber bush.  The metal end fittings are 316 stainless steel.  As standard, each diffusser is fitted with a 16mm hose tail for connection of the diffusser to the special flexible hose which aea also negative bouyancy.  The stainless steel hose tail is screwed on to the stainless steel fitting on the end of the diffusser, a NRV (non return valve) is fitted into the diffusser assembly.

Cleaning

Solid diffussers have problems with carbonate and iron desposition which blocks the diffussers.  Solid diffussers are therefore very difficult to clean and maintain.  Flexible membrane diffussers stay largely free of fouling, however they need a heavy frame or are anchored to the base of the aeration tank, this nakes the diffussers much more expensive and difficult to handle, it also makes them difficult to use in lagoons, or in retrofitting systems.

Our diffusser is a hybrid unit, because it is semi flexible, carbonates and metal oxides simply crack off the unit.  Also because our diffusser has it’s own internal ballast it doed not need to be anchored to the base of the tank.  if any cleaning or maintenance is required, the diffusser is simply pulled out of the tank using the air hose.  The tank can be full of water and the air blowers running when the diffusser is removed.

Oxygen Transfer Performance

Waste water treatment and activated sludge applications.

(based on 3 m @ 20 ˚C @ 20% saturation in kg/hr)

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Standard stocked length Oxygen probe available.

Aquaculture and Environmental Application

(based on 1.5 m @ 20 ˚C @ 60% saturation in kg/hr)

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More technical figures available on request