Dear RG Friends,
I want to know the performance and efficiency of AlCl3 & FeCl3 floculants to remove suspended solids and algae from pond's water.
which one is most suitable for the purposes.
Regards
It is not typical to use Cl3 coagulants in water treatment (chloride products are used in wastewater applications); usually Sulphates of iron and aluminum are used for water treatment.
Ferric products are generally more acidic than alum, which should be a consideration. Ferric has a strong color and even small spills or leaks from equipment can cause unsightly staining (particularly of concrete), which is very difficult to remove. The concentration of Ferric is typically 12-14% Fe while concentration of Al in alum coagulants is usually 8-10%. Specific Gravity of Fe products is greater than 1.4 and Alum is usually around 1.3. In general Fe works better for lower pH waters.
a bench test (jar test) - carried out free of charge by a supplier - will help select the optimum product for your particular application.
It is not typical to use Cl3 coagulants in water treatment (chloride products are used in wastewater applications); usually Sulphates of iron and aluminum are used for water treatment.
Ferric products are generally more acidic than alum, which should be a consideration. Ferric has a strong color and even small spills or leaks from equipment can cause unsightly staining (particularly of concrete), which is very difficult to remove. The concentration of Ferric is typically 12-14% Fe while concentration of Al in alum coagulants is usually 8-10%. Specific Gravity of Fe products is greater than 1.4 and Alum is usually around 1.3. In general Fe works better for lower pH waters.
a bench test (jar test) - carried out free of charge by a supplier - will help select the optimum product for your particular application.
It very much depends on the water source. Is it natural fresh water? Or brakish? Or industrial? What is the temperature, pH?
Al might be more soluble (thus less effective) - but it could be vice versa as well. Al's optimal pH range is much smaller than Fe's.
Dear Johanna Ludwig,
The Water Source is fresh underground well water, Brackish range TDS= 5500 ppm , pH 7.8, Temp= 39 C,.
Regards.
As far as I know, at this pH Alumina is not very effective. especially at this high temperature.
Here is a paper about seawater with a lot details about Fe and Al: http://www.sciencedirect.com/science/article/pii/S0043135411004507
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