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Q: Water quality ( No Answer,   5 Comments )
Question  
Subject: Water quality
Category: Science > Chemistry
Asked by: steelcowboy-ga
List Price: $2.00
Posted: 17 Jul 2004 13:55 PDT
Expires: 16 Aug 2004 13:55 PDT
Question ID: 375488
Where does the cleanest, purest water come from in everyday life? .Is
it from a condenser at a powerplant?
Answer  
There is no answer at this time.

Comments  
Subject: Re: Water quality
From: dr_bob-ga on 17 Jul 2004 20:09 PDT
 
What do you mean by everyday life?  Are you referring to drinking water?

The purest water, that is just H20 is usually prepared by removing
virtually all impurities using a combination of RO, ion exchange type
resin, electrochemical, and organic processing techniques.

Depending on the condensation process organic impurities from the air
will also contaminate the water.

The cleanest public drinking water has all kinds of stuff in it.

Chugs.
Subject: Re: Water quality
From: steelcowboy-ga on 18 Jul 2004 06:12 PDT
 
In everday life I mean here in the U.S as opposed to Antartica.I think
the cleanest and purest water would be the condensate makeup water.Its
a question for a powerplant class.
Subject: Re: Water quality
From: neilzero-ga on 18 Jul 2004 09:11 PDT
 
Because of chemicals added on purpose and inadvertantly at typically
power plants, condensate water is not safe for humans to drink. Where
very safe water is desired, several purifing processes preceed
multiple distilation including vacuum distilalation and discarding
both the first and the last vapors that come off. Fortunately human
immune systems can solve most contamination problems as really safe
water is rarely available at any price, inspite of many claims to the
contrary.
At typical power plants the condensate water is re-purified by ion
exchange before it is returned to the boiler, as condensate water has
oxygen, silica etc which erodes the turbine. Humans can tolerate large
amounts of oxygen and silica, but some of the ect. is hazardous.  
Neil
Subject: Re: Water quality
From: touf-ga on 20 Jul 2004 14:20 PDT
 
deionized water is pretty darn clean, and probably the cleanest you'd
find here in the us.
Subject: Re: Water quality
From: biogeochem-ga on 23 Jul 2004 06:44 PDT
 
It's important to remember that in Antarctica water may contain higher
concentrations of some pollutants than mid-latitude locations, as
gaseous pollutants tend to collect at the poles. Concentrations of
PCBs (Polychlorinated-biphenyls, used as flame retardants), for
example, are higher at the north pole than at any almost any other
location (industrial sites excluded) on Earth.

A source I have found of use in the past is the University of
Portsmouth in southern England (URL - www.civil.port.ac.uk/enviro/ see
'Treatment of Industrial Wastewaters').  You may also find material of
use within www.cranfield.ac.uk .

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