[Stoves] Water Disinfection - Mix Boiling Water and Unheated Water to Pasteurize

[K McLean]

Hi Crispin,

You said "keep [water] in a storage system that excludes all light. Nearly
everything dies (but not all, of course)"  I cannot find any research on
this.  Do you happen to have any?  This could be a method to disinfect
without cost..  Seems like well water should be disinfected, though.

Kevin

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On Mon, Sep 23, 2019 at 10:40 AM Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Dear Andrew
>
>
>
> The most important question is what do those temps kill: everything that
> is bacterial.
>
>
>
> Spores are a serious problem and prions even worse. Tough little things.
> They are not really alive and some coat themselves when “challenged”.
>
>
>
> >>Low cost WAPI's wax indicators can tell you 70C is achieved visually
>
>
>
> >Thanks for that Tony, I too find this interesting and having a means of
> indicating the certainty of adequate treatment  would reassure me, who
> drinks, bathes and cleans with water supplied by a pipe with guaranteed
> levels of hygiene.
>
>
>
> There is a long-standing programme to promote the distribution of those
> devices in low water quality areas.
>
>
>
> >We had a  potter who used to contribute, now deceased , his name escapes
> me, who made pottery filter jugs which he precipitated a thin late of
> silver in as a bactericide
>
>
>
> Those work very well and remove the need to boil.  Also a slow sand filter
> (properly managed which means having two in parallel) so, ditto. We always
> added chlorine as a precaution, with 2 ppm of free Cl at the end of the
> longest line at the last tap. That takes care of pipeline contamination.
>
>
>
> Caution for those planning to test the bacteria after any processing –
> read how to do this sampling well. You have to “flame” all the containers
> and the tap before taking the sample. Contamination is *very* easy. I
> would not believe a positive result collected by an untrained staffer.
>
>
>
> >Interesting chart Crispin but it doesn't show what each of those
> treatments achieve, or do they all do the same thing to all microbes?
>
>
>
> All microbes usually found in water.  Surely there are exceptional cases?
> Deep sea critters? More escapes heat than I assumed.  It helps to know what
> is in the water before starting to test a treatment regimen.
>
>
>
> >What temperature does kill anthrax, tetanus and botul;sm spores?
>
>
>
> Looks like 150 C.  They are no so much killed as destroyed. I think they
> are not alive in the first place.  “Life” has a loose definition.  A great
> many water-borne pathogens are killed simply by being in a fully darkened
> tank for three days. If you have no treatment available at all for washing
> water, keep it in a storage system that excludes all light. Nearly
> everything dies (but not all, of course).  Such simple treatment will kill
> bilharzia, for example.
>
>
>
> Drink safe…
>
> Crispin
>
> Ex-Clerk of Works, Rural Water Supply Program, Hhohho District, later
> Lubombo District, in (then) Swaziland – one of the lighter squares on the
> board of my chequered career
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