Water and Wastewater.com Help Forums

shasen

Junior Member

Offline

Water and
Wastewater.com is
the best!

Posts: 77

Gender: male

Company or Organization: abc

Iron in raw water
Feb 14^th, 2007, 4:29pm

I am planning to install a Iron removal filter in the raw water source itself.The total iron levels are around 3 ppm and been facing iron deposits problem in my Ro plant . I am in the process of making a proposal for approval and also i need to justify it.
what other factors could justify a proposal for a chemical pocess industry.Generally
1.What will be the effects of iron in cooling tower?
2.What will be the effects in aerobic treatment process?
3.any other negative effects in using water with iron content.

Back to top

IP Logged

aquaseaulutions

Full Member

Offline

Water and
Wastewater.com is
the best!

Posts: 162

Company or Organization: AquaSeaulutions

Re: Iron in raw water
Reply #1 - Feb 15^th, 2007, 12:34am

Hello Shazen,

Why using chemicals? Depending the pump capacity, you can install an iron removal plant like that:
Mazzei air injector installed in by-pass (a booster pump could be necessary), air stripping tank(s), filtration tank filled with birm. It is small and not really expensive. That kind of set up could cost approx. 15000 usd for 50 to 60 gpm. The pH must be higher than 6.5.
For your questions:
1- Iron will make deposits and reduce heat exchange efficiency, reduce pipe diameter (more pumping energy consumption), increase the risk for bacterial development, increase corrosion, ...
2- Iron is easy to oxydate...it will consume oxygen and will precipitate
3- Stain, corrosion, taste, bacterial development, O2 consumption, increase TDS, increase SS.
I hope this help.

Alain Berrouard, M.Sc.
AquaSeaulutions

Back to top

IP Logged

ROSA

YaBB Newbies

Offline

Silence is the
virtue of fools.

Posts: 21

Company or Organization: Verzos Inc

Re: Iron in raw water
Reply #2 - Feb 15^th, 2007, 4:48am

Have you done any speciation tests on your iron - what kind is it ferrous or ferric? What is the raw water pH? 3ppm iron is way too high to run thru a RO plant. Usually anything greater than 0.5 ppm will cause colloidal fouling in a RO membrane. The fouling risk alone should be a justification for you to invest in a process /solution to remove iron.

Aeration or oxidant addition would be my choice for iron removal. What sort of filter are you considering?

Back to top

IP Logged

shasen Junior Member Offline Water and Wastewater.com is the best! Posts: 77 Gender: Company or Organization: abc	Re: Iron in raw water Reply #3 - Feb 15^th, 2007, 4:59am Thanks Mr. Alan and Rosa Thanks for the input. The proposal i have made is also BIRM media.Iron mostly is of ferric.
Back to top	IP Logged

ROSA YaBB Newbies Offline Silence is the virtue of fools. Posts: 21 Company or Organization: Verzos Inc	Re: Iron in raw water Reply #4 - Feb 16^th, 2007, 2:57am If u are planning to use BIRM media make sure that ur feed is devoid of any organics and sulfide. pH should be near neutral to increase media effeciency
Back to top	IP Logged