DAF Systems and Dosing Rates

Question

What is the ideal dosing for a seawater DAF system with a conventional pretreatment with DMF?
The coagulant used is ferric chloride. Even though chlorination will prevent biogrowth at the intake, is it recommendable dosing chlorine while algae blooms happens? What about pH adjustment?
Typically all of these questions are resolved trough jar tests, however, I would like to have some feedback from the network on this regard.
Thanks

Azrin Kasman · Answer

Hi There
I hope I am not to late to help you answer few questions.
Ideal Ferric Chloride Dosing:
Depend on where the Sea Water you are treating. If it is in the GCC You Can Start with 4.3 ppm  and perform Jar Test to fine tune the Ferric Chloride Dosing Rate. You may want to check Iron content before and after the Ferric Dosing in SeaDAF to check how well the seaDAF is performing 
Continuous Chlorination during Algae Bloom is good to help maintain the plant availability during the Algae Bloom Season. It will help reduce the DP Spike in the Cartridge Filter. However You may want to increase the CIP during the period. The RO DP will increase sharply during the Algae Period however you may still recover the RO Performance through proper CIP.
Best Regards
Azrin KAsman

Manuel Moya · Answer

Do You use any floculant?
You can use our products www.derypol.com that works with seawater and increase DAF performance

Gino Quackels · Answer

dosing the correct hydrogen peroxide will avoid the pH adjustments and will be much more effective against biofilm. www.bieau.be don't forget that no biocidal byproducts are formed and that you only need 8% of the amount of chlorine.....

Taxonomy