Re: is there any filteration plant which can use for sulphate removal in lake

Sajid,

Several methods of removing sulfate from water are available. The treatment method selected depends on many factors including the level of sulfate in the water, the amount of iron and manganese in the water, and if bacterial contaminaiton also must be treated. The option you choose also depends on how much water you need to treat.

For treating small quantities of water (drinking and cooking only) the typical mehtods may be distillation or reverse osmosis. The most common method for treating large quantities of water is ion exchange. This process works similar to that of a water softener. Ion-exchange resin contained inside the unit, adsorbs sulfate. Because sulfate is an anion, (a negatively-charged ion), the water must first be treated to remove cations (positively-charged ions) using a cation resin. When the resin is loaded to full capacity with sulfate, treatment ceases. The resin then must be regenerated with a salt (soidium chloride) brine solution (or for higher quality water acid / sodium hydroxide regeneration) before further treatment can occur.

Distillation boils water to form steam that is then cooled and recondensed. Minerals, such as sulfate, do not vaporize with the steam and are left behind in the boiling chamber. Reverse osmosis membranes have a porosity that permits water molecules to pass through but leaves the large ions in solution.

The U.S. Environmental Proteciton Agency maintains a web site that describes the health concerns and recommended sulfate limits in drinking water.

http://www.epa.gov/safewater/su lfate.html

Another site describing the sulfate / sulfide chemistry of water is:

http://wilkes.edu/~eqc/sulfate1.htm

I hope this helps.