Jeff-
Thanks for the post. Yes, it's true that pasteurization at 65C kills all
pathogenic bacteria and viruses, as well as worms and cysts. I don't recommend
"feeling it with your hand" however as even a 10 degree lower temperature will
have a much lower effectiveness. As you note, a wax indicator developed by Dr.
Robert Metcalf accurately and safely demonstrates when the water is pathogen
free. We distribute them at no cost to families and instruct them on their
use. Filtration through a clean cloth probably helps a little, as does letting
the water settle, but is not necessary for pasteurization. Some methods that
use solar UV disinfection do require clean water and clear PET water bottles
for effectiveness. They also take longer, lack an end point and have
inconsistent results and for that reason we don't recommend them.
The last step is keeping safe water safe, by storing it in clean containers
with small openings so that people cannot recontaminate it by dipping in with
dirty containers or hands.
I'm going to give a water testing and water pasteurization workshop here in
Portland in the next months if anyone is interested in being trained.
Tom Carter
Agua Pura Para El Pueblo
________________________________
From: Jeff Holiman <[email protected]>
To: Discussion of biomass cooking stoves <[email protected]>
Cc: Tom Carter <[email protected]>
Sent: Wednesday, February 13, 2013 1:47 PM
Subject: Re: [Stoves] A simple water sterilization technique
Hello,
Dr. Metcalf continues to mentor Tom Carter, Director of Aqua Pura Para El
Pueblo, a group that also works internationally teaching basic water quality
testing for coliforms and distributes simple pasteurization indicators made
from a wax that melts at 65 C.
These indicators have the potential to save much fuel for those folks that are
currently boiling water to ensure having reached adequate temperature for
pasteurization.
Kind regards,
Jeff Holiman
On Mon, Feb 11, 2013 at 6:16 AM, Bruce Stahlberg
<[email protected]> wrote:
Greetings,
>
>Bob Metcalf has been treating and testing water quality in Africa for many
>years and uses simple, fairly low tech methods of testing the water on site to
>determine if it is safe for drinking. The testing can be done on site. It is
>explained here:
>
>www.imageevent.com/bobmetcalf/watertestingpasteurizationinafrica
>
>Search words: Bob Metcalf, water pasteurization
>
>Hope this helps.
>
>Bruce
>
>
>On Fri, Feb 8, 2013 at 6:20 PM, nari phaltan <[email protected]> wrote:
>
>Hello stovers,
>>
>>
>>One of the major problems of rural areas is unavailability of clean drinking
>>water. A simple method of filtration and heating it to 55-60 degrees Celsius
>>can remove all bacteria. The paper is at;
>>http://www.currentscience.ac.in/php/forthcoming/RC494.pdf
>>
>>
>>And the news item is at;
>>http://www.firstpost.com/fwire/sari-sun-combo-can-sterilise-dirty-water-619304.html?utm_source=fwire&utm_medium=hp
>>
>>
>>Cheers.
>>
>>
>>Anil
>>
>>
>>
>>
>>
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
[email protected]
to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
for more Biomass Cooking Stoves, News and Information see our web site:
http://www.bioenergylists.org/
