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Pressure Filtration Fibreglass Filters

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Details

Filtration of water by pressure sand filtration is a process which has been used for many years in a variety of industries. The process is applicable to aquaculture, effluent treatment and swimming pools,   and has been used with considerable success when applied in the correct situation. Fibreglass filters are available in a range of sizes from very small units up to 3m diameter processing up to 100 cubm of water per hour. Higher flowerets are possible by using a multiple number of filters.  The plastic fibreglass pressure filters were originally designed for the treatment of swimming pool water,  however when used with AFM filtration media,   the performance of the filters are dramatically improved.

Filter Size and connections

Filter diameter (inches)	connection size inches	AFM media Kg	Max recommended flowrate cubm/hr	Back-flush flowrate cubm/hr
24"	1.5"	150	5	5 to 10
30"	2"	200	9	9 to 18
36	3"	375	13	10 to 25
42"	3"	550	18	15 to 36
42" horizontal	4"	1200	40	30 to 60

Please note that the water flowrates given in the table above are approximately 1/2 the rate the filters are capable of achieving. The reduced rate is essential for optimum filtration efficiency in aquaculture, or systems where the level of suspended solids are greater than 2mg/l..

Using the filter

The photographs below show the position of the multiport valve,  simply by rotating the valve the water flowrate through the filter is reversed and the media cleaned.  The back-flush cycle should last for 1 to 2 minutes.  The photograph above shows a manual multiport valve connected to a 24" filter.  As opposed to the manual valve an automatic actuated valve can be fitted to the equipment.  The back-flush cycle is controlled by a time switch on the controller.

Operational aspects

The fibreglass pressure filters will operate at the flowrates given in the table above with approximately a 0.3 bar ( 5psi) pressure differential across the filter when the AFM media is clean.  Solids will be remove from the water by the AFM media,   and the pressure drop will increase.  When the pressure differential increases to 10psi,  the filter should be back-flushed.  In most cases it is recommended that the filter is back-flushed once or twice each day.  After a back-flush it is important to lace the filter in rinse for approximately 30 seconds before going back to the run phase.

A link to our pumps gives details of a range of self priming centrifugal pumps that are matched to the filters.  The pumps are manufactured from composite plastic and stainless steel.   The pumps are ideally suited to most industrial waste water, chemicals and seawater applications.  An important aspect is that the pumps will not increase the pressure in the filters above 2 bar.  The maximum operating pressure of  the filter is 22psi, and static pressure test maximum of 32psi.

The pressure filters are supplied complete ready for assembly and fitting of the multiport valve,  a full range of fittings, spares and accessories for the filters are always held in stock ready for immediate dispatch.

 

European Commission project  for your Life & the Environment click here ISO 9001 quality  company	Aquaculture, Water & Wastewater Treatment Environmental & sustainable water treatment to save the planet	| Contact us  | About us |  Search |  Shop ||
Web  sites  ]   | Home |   AFM  |  Ozone  |  Membrane filtration  | Swimming Pools |

You can reach us by e-mail at: howard@DrydenAqua.com Copyright © 1997
Last modified: May 26, 2008