Alternative to direct Chlorination in a Cooling Water System ?

[Techcitizen]

Can somebody suggest an alternative (other than NaOCl) to direct Chlorination (which is done by mixing gaseous chlorine in water thru a ejector) for a large Cooling Water System (circulating flow of approx. 36000 cu.m/hr) ? What is your experience with such a system ?

 

[cub3bead]

You have a number of alternatives available at varying degrees of cost and effectiveness.

1. Bromine (available in several forms).
2. Mixture of bromine/chlorine.
3. Chlorine dioxide
4. Ozone
5. Hydrogen peroxide

 

[stanier]

Nalco chemicals have an alternative to chlorination for cooling towers.

 

[EMKWR]

Gajjar,

If your problem is the environmental effect of the chlorine, it might be worthwhile to consider the discontinuous use of chlorine (pulse chlorination). This method can reduce your chlorine consumption with up to 90 %. Think I have a paper on it on my pc, please contact me if you're interested.

Edwin Muller
KEMA Power Generation & Sustainables
Arnhem, The Netherlands
E-mail e.f.muller@kema.nl
Internet:

http://www.kema-water.nl

http://www.kema.com

 

[bimr]

We recently did a study for the same application. Sodium hypochlorite is the most economical alternative to gaseous chlorine. If you have an open cooling water system, you are probably already regulated to 2 hours per day for chlorination.

Some clients prefer the use of bromine. But, bromine has to be activated by chlorine so you are using both chemicals. Chlorine dioxide is an acceptable alternative, but at greatly increased cost. Other alternatives are probably not economically acceptable.

 

[jherbert]

- ozone

first cost - more expensive;
certainly superior for legionella and effluent quality;

my 2 cents

cheers

 

[Techcitizen]

jherbert,
Any idea about feasibility of Ozone for large circulating flows (say 36000 cu.m/hr) ? What kind of technology you have adopted, who has supplied it, what is the circulating flow in your case and what is the approx cost ?

Thanks in advance for the replies !

 

[jherbert]

In which country do you need it?
leave an email address and I'll reply

cheers,

 

[Techcitizen]

jherbert,
Can you pl reply at hemgaj@indiatimes.com !

 

[bimr]

gajjar,

In the US market, ozone is never used for power plants. Besides the cost, ozone provides no residual.

fherbert is talking about small commercial cooling systems where the users often don't even know if the systems are working.

 

[iei9596]

I suggest you to go for a chlorine dioxideor bromine as an alternate to chlorine.

to eliminate chlorine you can also use non oxidizing biocides.

Ion Exchange Indai ltd can help u in this regard