I wonder if the President wants to deal with this WMD( Water the Masses
Depend on)topic?
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: Monday, December 13, 2004 9:46 AM
To: [log in to unmask]
Subject: Re: [TN] DI Water


No way. Producing PURE H2 and PURE O2 to produce PURE water would be 
horrendously expensive, energy consuming and polluting.

Brian

Brooks,Bill wrote:
> This is indeed an interesting subject... 
> 
> Is it possible that the production of water through combustion of oxygen
and
> hydrogen would be more pure and lack all the dissolved solids that are in
> water that has passed through the atmosphere as rain or of course water
that
> has dissolved solids in it from the ground, or worse yet the slat water in
> the oceans. Would that be more economical than filtering and deionizing
and
> treating the water with UV? Don't the 'fuel cells' they use on the space
> shuttle use a similar catalytic action to create electricity from
hydrogen? 
> I wonder if that might be a more economical way to produce pure water than
> with the current methods...
> 
> Best regards,
> 
> 
> Bill Brooks - KG6VVP
> PCB Design Engineer , C.I.D.+, C.I.I.
> Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
> e-mail:[log in to unmask]
> http://www.dtwc.com
> http://pcbwizards.com
> 
> -----Original Message-----
> From: Brian Ellis [mailto:[log in to unmask]] 
> Sent: Tuesday, December 07, 2004 11:00 PM
> To: [log in to unmask]
> Subject: Re: [TN] DI Water
> 
> Let me add my CYP 0.02 worth. If you take potable tap water, pass it 
> through a new mixed bed DI column, and drink it, it will not harm you in 
> any way. It'll taste bloody 'orrible, but that's another story.
> 
> If you do the same with a column that's been in service for some time, 
> then there is a risk of excess micro-organisms of unknown species having 
> proliferated in the resin bed. I've seen DI columns in clear plastic 
> tubes turn green with algae and the chlorination of tap water does not 
> prevent it. Probably the same applies to some bacteria, a few of which 
> may be harmful.
> 
> I disagree with the guy who said that DI water could not be better than 
> 2 megohm-cm. Let me quote facts:
> 1. RO does not deionise: it removes all dissolved impurities by a factor 
> of about 10 to 20. If your water starts with a conductivity of, say, 300 
> µS-cm (typical for a medium quality tap water), it'll have a 
> conductivity of 15 - 30 µS-cm after a single RO stage and non-ionic 
> dissolved material will also be removed in about the same proportions. 
> To prepare potable water from sea water in a desalination plant, it will 
> require two- to three-stage desalination, UV microorganism murder and 
> remineralisation.
> 2. Distillation is not a very effective way of purification, despite 
> popular belief. It, too, will only remove dissolved solids by a factor 
> of about 50 to 100 per stage. This is explained by the fact that boiling 
> water produced bursting bubbles on the surface and these throw minute 
> droplets of water + impurities into the steam. The water in these 
> droplets evaporates and the impurities float around as an aerosol and 
> get partially washed out by the condensate. In addition, the 
> constructional materials of the still tend to dissolve slowly in the 
> distillate. The distillate will also pick up CO2 from the air if it is 
> allowed to trickle into the receiver. Even triple distilled in quartz 
> water, which is the purest you will find, will rarely have a 
> conductivity better than 0.2 to 0.5 µS-cm and is usually complemented by 
> a mixed bed DI column to bring it down to typically 0.06 µS-cm 
> (so-called "18 megohm" water). Distillation is horribly energy-intensive.
> 3. DI water produced by simply passing tap water through separate cation 
> and anion beds, followed by a "polishing" mixed bed DI column will have 
> a conductivity as low as 0.06 µS-cm but will still have almost its full 
> complement of non-ionic dissolved solids. If subsequently passed through 
> two carbon columns (different adsorption characteristics) and UV 
> irradiation, followed by a 0.1 µm mechanical filter, it will be 
> practically the same as the purest "18 megohm" water. This is what is 
> used for semiconductor production, except that it is preceded by a 
> single stage RO, as well.
> 
> Brian
> 
> David Tremmel wrote:
> 
>>Dear Technetters,
>>
>>As a joke, someone asked me what would happen if they drank DI water and
> 
> it
> 
>>started me thinking.  Is DI Water potable?
>>
>>Thank you,
>>
>>David Tremmel
>>Belmont Trading
>>3160 MacArthur Boulevard
>>Northbrook, IL 60062
>>(847) 412-9690, Ext. 345
>>(847) 858-5540, Cellphone
>>
>>_________________________________________________________________
>>¿Cuánto vale tu auto? Tips para mantener tu carro. ¡De todo en MSN Latino
>>Autos! http://latino.msn.com/autos/
>>
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