Installation of DrydenAqua Air Diffusers

Our semi flexible diffuser range in size from 0.3m to 5m in length, they have their own internal ballast and can be used in tanks or lagoons. The diffusers do not need to be anchored to the base of the tank and they can be easily removed from cleaning or maintenance while the tanks is full of water or the blowers running.  Installation usually involves an air ring main around the perimeter of the the tank / lagoon, saddle clamps are fitted to the air ring main and 1/2" hose connected to the saddle and the diffuser is connected to the other end of the hose.  The diffuser is then simple dropped or thrown into the lagoon.  Installation could not be simpler, and maintenance is very easy.

Example 1.  Effluent treatment  in large tanks and lagoons click here

Example 2. Effluent treatment in Aeration lanes  click here 

Example 2.  Effluent treatment in small tank based systems click here

Example 3. Destratification of lakes and reservoirs  click here 

The Dryden Aqua high performance air diffusers are like a hybrid between a solid tubular diffuser and a flexible membrane diffuser.

 

The diffusers are made in lengths from 30cm to 500cm,  however the standard sized unit for use in waste water treatment is 300cm in length.  The standard 300cm diffuser is rated at 9 to 10 cubm/hr of air with a pressure drop of approximately 2psi. The diffuser is fitted with a 1/2" hose tail and non return valve at one end  (6.2.10).   The other end of the diffuser will either have a plug,  or is fitted with another 1/2" hose tail to allow the air to enter from both ends.

 

The diffuser is flexible and can be bent to form a circle. The diffuser also contains its own ballast,  therefore there is no need to anchor the diffuser to the base of an aeration tank.

 

1. One of our diffusers code 6.2.10 has the same performance as approx 20 disc membrane type diffusers
2. You do not have an expensive installation,  or any pipe-work anchored to the base of the tank.
3. Our diffusers can be retrofitted to tanks, and maintained while the tank is full of water and blowers running.
4. Dryden Aqua diffusers are perfect for  lakes and plastic lined lagoons, they can even be used in clay lined lagoons

Run an air ring main in 90 to 125mm pipe around the perimeter of the tank,  if the tank or lagoon is very large, then a larger diameter pipe may be used.. The air ring main should be fitted to the top of the tank. Fit saddle clamps onto the pipe and quick release snap couplers. Fit 1/2" hose onto the couplers and the 3m diffuser onto the end of the hose, use sufficient hose to take the diffuser to the bottom of the tank/lagoon. Only one end of the diffuser is fitted to the hose.

With the above arrangement there is no aeration towards the centre of the lagoon,  however we find is that with the air diffusers  around the perimeter, there is an up welling of water at the sides of the lagoon, the water then shoots out across the surface and then down at the middle.  The momentum of water motion develops, to such an extent that a tank or lagoon of about to 4000 cubic meters can be turned over by 500 cubm/hr of air from a 22kw blower in around 30 seconds.  This arrangement makes for very efficient  and effective aeration. Also because the diffusers are arranged around the side,  you can easily remove the diffusers by simply pulling on the hose.  The arrangement is suitable for most forms of water and waste water treatment, such as leachate water from landfill sites.

Aeration channel,  heavy loading

If the aeration channels are under 5m in width, then  the diffusers may be connected to 1/2" hose at both ends.  Or air diffusers have their own internal ballast and will stay on the bottom of the tank, however if they are used to treat water of a high BOD/COD there will be a high level of aeration and turbulence in the tank. The diffusers may be only 0.5 to  2 meters apart, and given the high turbulence there will be a tendency for the diffusers to move. To reduce the diffuser movement a diffuser weight is used at each end.  The weight is a block of stainless steel, it is not fixed to the base of the the tank, so this means you can still remove  the diffuser while the tank is full of water simply by pulling on the hose. 

As opposed to using diffuser weights you could have the pipe work under water and secure the diffuser at both ends,  frames secured to the base of the tank, or with sufficient weight to keep them on the floor.