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EWB E-conference 2011


[EWB E-conference 2011] Water and Sanitation

United Kingdom
I'm no expert but have always understood that water does not need to be boiled to be sterilized!
Have a look at
http://solarcooking.org/pasteurization/solar_water_pasteurization_faq.htm

Graham





Hello Jack,

Thanks for reading the Barrie / McBride / Antizar-Ladislao paper. I'm pleased you agree that there a decision support system could potentially increase efficiency.

Regarding your comments about chlorine vs boiling water. Both have their advantages and disadvantages, and it is unclear which is better. Boiling is possibly better at destroying pathogens but chlorine tablets do provide residual protection, which is possible very beneficial. Boiling requires the collection or purchase of fuel, has possible smoke inhilation health issues, is time consuming and you end up with hot water, something not always popular. It also necessarily be done in fields or at work. Chlorine gives water a funny taste is consumable, requiring re-purchase, it also takes a while to clean the water.
Both are good, neither is perfect and it is not a simple choice between them, or indeed any other treatment method.

I think increasing education about water safety is crucial, if people know their water is unsafe then they will act to ensure they have a clean supply. If there is demand for water treament, then supply will follow.
Having said that, commerical projects need some regulation. For example mineral pot filters are very popular in Vietnam, but are of questionable effectiveness.

It really isn't simple, and that's why a tool that learns from experience collected from many different source could be very useful.

Angus

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Interesting, I had thought that it was necessary to boil the water (but perhaps this is common practice because it is easier to see when water is boiling than when it is 65 degrees!).

It seems that solar water sterilisers heat water up to about 50 - 60 degrees rather than boiling them. This is an old link but it may be of interest:

http://www.ashdenawards.org/winners/ahead
Hi Jack,

Yes I had a similar experience in Sierra Leone, interviewing people out
there showed that they were aware of chlorine tablets, the only point of use
water treatment they know of. I think South east Asia from having spent time
in Cambodia has access to a lot more than Africa. I don't know what others
have experienced in different regions?

I think in addition to the previous comments some interesting points that
came across from all the presentation in this platform on Friday was the
need to address how we go about implementing water treatment solutions as
currently there are too many cases that fail. Consideration of decision
support tools such as case Based reasoning offer one approach, another was
introducing the need for a service delivery approach with the idea that a
project can be made more sustainable through a change
of focus from infrastructure to service delivery.


On Thu, Mar 3, 2011 at 11:00 PM, <hedon@hedon.info> wrote:

>
> Angus, thank-you for your reply. I completely agree that both have
> advantages and disadvantages, making each more appropriate in different
> situations. I agree that smoke inhalation is a big problem in development,
> but I think this problem has the potential to remain with chlorine tablets,
> since people will still be cooking food. I asked about boiling water because
> I spent last summer in Kenya, and my experience was that many people didnt
> treat the water at all (which was collected from roofs), while those who did
> treat water boiled it. I didnt encounter any Kenyans using chlorine,
> perhaps due to the taste or the cost. Generally the water was then used to
> make chai so the hot temperature was a bonus in this context!
>
> On the subject of filters, what do people think of hand-held filter systems
> such as the lifestraw?
>
> http://news.bbc.co.uk/1/hi/world/africa/4967452.stm
>
> The article quotes a spokesman from WaterAid as being very sceptical, due
> to the high cost. Is there not also a risk that it might increase
> water-borne infections such as bilharzia? On the other hand is it possible
> that donors are happier to see their money spent on what should be a
> permanent device (as opposed to a consumable such as chlorine), this
> increase in donations increasing the lifestaws potential?
>
> Also, Alison would it be possible please to describe the multi filtration
> system used to treat the water at Emem?
>
> --
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> surrounding the live EWB-UK research conference 2011
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>


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Graham,

In response to your question about sterilisation boiling is often used as it is difficult to know when something has reached 82 deg C but certainly, as for milk pasteurisation kills the bacteria which will cause stomach upsets and diarrhoea. Most bacteria is de-naturised at around 40 deg C, however some of the nastier more resilient strains can survive to higher temperatures. However in water where there is severe degrees of flocculation, bacteria trapped inside floccs may survive to higher temperatures.
Thanks Brian - I should have mentioned that the WEDEC centre have a great
wealth of resources on these issues definitely worth a browse for those
interested.

On Tue, Mar 8, 2011 at 10:11 AM, <hedon@hedon.info> wrote:

>
> Asseveral people have mentioned Household Water Treatment - have a look at
> the two WELL technical briefs on the subject.
>
>
> http://wedc.lboro.ac.uk/knowledge/well_pubs_lists.html?l=6
>
> --
> HEDON EWB E-conference 2011 - This conference is to facilitate discussions
> surrounding the live EWB-UK research conference 2011
> Unsubscribe www.hedon.info/Groups | Visit the forum online
> http://www.hedon.info/forum15
>
>


--
  • Miriam HANSEN MEng*
Community Coordinator | *HEDON Household Energy Network*
      • T: *+44-(0)20 30 120 130 | *M:* +44-(0)7595 715820
  • Website*: support.hedon.info *| Online platform:* www.hedon.info
PO Box 900, London, Bromley, BR1 9FF, UK

Visit our online journal *Boiling Point*<http://www.hedon.info/BoilingPoint> |
Join our* London meet up <http://www.hedon.info/LondonRIG>*
 
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