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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