Filter on Cooling Tower Sidestream
Filter on Cooling Tower Sidestream
(OP)
We are looking at installing a filter on the sidestream of a cooling tower. The following two technologies have been proposed.
I would like to understand the differences between a pressure media filter and a sand/gravity filter. Are there advantages/disadvantages to using either of these. Does one technology have better removal of small particles?
What type of filter have others used in this service?
Thanks for your help.
I would like to understand the differences between a pressure media filter and a sand/gravity filter. Are there advantages/disadvantages to using either of these. Does one technology have better removal of small particles?
What type of filter have others used in this service?
Thanks for your help.





RE: Filter on Cooling Tower Sidestream
Are you going to filter the cooled water or the hot water? If it is the cooled water the gravity design is likely the best because you can let it flow back into the basin without affecting the cold water temperature.
I have always used gravity filters with an integral backwash storage tank so that I didn't have to deal with storing and pumping filtered water for backwashing the media. These normally have their outlet weir set about 12 feet above grade which allows the gravity flow back into the basin. Make sure you place the filter vessels so they do not interfere with the air flow into the tower.
RE: Filter on Cooling Tower Sidestream
This is a good reference
ht
Also this.... from the cooling tower doctor
http://www.ctdoc.com/Ch12.html
and..
http://www.ameriwater.com/cyclosnd.html
Please complete this thread by letting us know what you decide....
MJC
RE: Filter on Cooling Tower Sidestream
The advantage of pressure filters is that you can have higher throughput gal/sq.ft. than for gravity filters. That will allow the use of smaller filters. Throughput through gravity filters is limited by the water head across the filter. With pressure filters, you can also choose when you want to backwash, rather than waiting for the filter headloss to develop.
The filters will have the same performance in regards to filtering ability.
RE: Filter on Cooling Tower Sidestream