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Drinking Water for Small Communities

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Keith Gavin
Director of Technical Services
DPM Water Technologies Limited
(Business)


Submitted by: Aquacube

Discussions about this entry

by Seamus B. on March 2, 2008 - 03:17

This system seems well adapted to meet the needs of small, relatively isolated & self-sufficient rural/sub-urban communities. The end user out-of-pocket costs, per unit measure, also seem impressive, if proven in practice. The less tangible (i.e., portage) time/labor costs one of your respondents noted recently would seem to me to be a consideration factor ONLY if one were comparing putting in a system where long hours of drudgery in manual water transport/handling were not already the only means of obtaining whatever "raw" water is now available; i.e., that factor is pretty much a wash, if not on the positive (i.e., intangible cost reduction) side, since - at least theoretically, there likely wouldn't be as much "down time" loss, waiting in long lines.

One other pertinent question I would raise: Since you are providing a micro system obviously entailing substantial appropriate technology, why not go a step further and at least explore use of purification agents in the system OTHER than Chlorine-based.
Considering that the EU has - apparently fairly enthusiastically - passed legislation abandoning Chlorine use in the central systems of its member nations, in favor of silvered filters; and the reports out of medical clinics/test labs worldwide are now piling up, indicating that Chlorine - in whatever form - has some fairly strong negative health side effects, when ingested, it seems high time that those investing in alternative water - especially potable water - provisioning system should also start seriously exploring new, equally alternative technology purification agents and procedures. We really do need to start asking ourselves if we may not be "killing with kindness" those we seek to help with healthier lives; if for no other reason than to take seriously what Medical Science/Health practitioners are now telling and demonstrating for us.

by Aquacube on March 18, 2008 - 05:05

Could you please help me find any reference to EU attitudes to silvered filters? I asked the question in my last response to you.

..." we are always open to alternative solutions when looking at all aspects of water treatment, not just disinfection. As a result I am intrigued by your reference of the EU passing legislation abandoning chlorine in favour of silvered filters as I have not heard of this, and can find no reference to it on the internet – could you please inform me where I could get more information on this"....

regards

Keith

by Aquacube on March 7, 2008 - 06:44

Dear Seamus,

Thank you for your comments.

In our range of products we do use a range of disinfection methods other than just standard chlorination, such as electro-chlorination and UV, and for specific projects ozonation and chloramination.

The reason we have chosen to use standard chlorination using calcium hypochlorite for this system is threefold;

Firstly calcium hypochlorite is readily available pretty much everywhere in the world.

Secondly it is highly cost effective.

Thirdly the concentration of chlorine in the treated water can be easily measured using simple colourometric (DPD) tests, which are cheap and simple to use.

With regards the health issues associated with chlorine, you are right that chlorine has been linked with adverse health effects, but you just need to look at the statistics to see that the health benefits clearly outweigh the risks, i.e. how many deaths can be attributed directly to dirty water vs how many deaths can be attributed directly to ingestion of chlorine in drinking water.

That being said, we are always open to alternative solutions when looking at all aspects of water treatment, not just disinfection. As a result I am intrigued by your reference of the EU passing legislation abandoning chlorine in favour of silvered filters as I have not heard of this, and can find no reference to it on the internet – could you please inform me where I could get more information on this.

Whilst silver is an option, my concerns with regards the use of silver as a disinfectant are follows:

Firstly, there are health concerns over the use of silver which is why the US FDA passed a ruling in 1999 stating that “drug products containing colloidal silver ingredients or silver salts for internal or external use are not generally recognized as safe and effective”.

Secondly, I would question the effectiveness of silver as a disinfectant. The WHO Guidelines for Drinking Water Quality states “Silver is not very effective for eliminating disease-causing microorganisms, since silver by itself is slow acting.” (Section 6.3, p110)

Thirdly, how easy would it be for the end user, who may be in a fairly isolated community, to source the required silver chemicals?

Fourthly, how would the use of silver affect the cost of the treated water, especially if a comparatively costly logistical chain is required to be put in place to supply the consumables?

And finally, how would the operator measure the concentration of silver in the treated water? There are obviously ways of doing this, but how easy and expensive are the photometers, or other equipment, required to do this?

Kind Regards

Dr Keith Gavin

by 24-7Waterworks on March 1, 2008 - 01:18

Hi Keith,

I am impressed with your committment to providing safe water for small communities and your plans to promote community ownership of the system but I am concerned about the relatively high costs that you mention just for operation and maintenance. Will this really be financially sustainable?

The cost that you mention of $ 1.00 per kiloliter (1 cent per ten liters) is about twice what is currently charged to industry for water in India and roughly 20 times what is charged to residential users. In addition, it appears that you are only counting the cost of operating and maintaining your system, not the cost to the consumer of walking to and collecting the water from your treatment plant.

While these latter costs (the opportunity cost of women's time) may be difficult to estimate, they are very significant and typically far greater than the actual purchase price of water. For suggestions in estimating these costs, take a look at the following site on the Indian Water Portal: http://www.indiawaterportal.org/blog/index.php/2008/02/09/on-the-hidden-cost-of-free-water/ (Although the prices there are quoted in Rupees, you can easily convert Rupees to Dollars at the rate of 40 Rupees to the Dollar.)

With these costs (the personal cost of collecting and transporting water) in mind, you may want to also want to incorporate a system of small private entrepreneurs to deliver water to individual households and/or compare the cost of a piped water distribution system.

While I recognize that there are many differences between communities in the Carribean and in India, there is an unfortunate universal tendancy to ignore the value (opportunity cost) of women's time.

Thanks for your continued interest in this area,

David

by Aquacube on March 1, 2008 - 08:07

Hi David

thank you for your email which we have all found very thought provoking. What our tests have shown is that the cost is less then 1 cent per kilolitre and we believe, significantly below 1 cent. However, you are correct in saying that we have not taken into account the opportunity cost for women collecting the water. Our experience in LAC countries is that the distances travelled to collect water are not significant. I completely agree that India is different although I have very little knowledge of the country.

What I would like to do is discuss your message with my colleagues on Monday and then get back to you with our thoughts. Clearly your opinion would be of great interest to us.

regards

Keith

by danafrasz on February 25, 2008 - 14:08

Hello Keith,
Do you have any sites in mind for installation? What countries has the plant been installed in? Has it been implemented yet? I'm uncertain about your social impact and financial sustainability. Have you worked to create a market and community based approach around your product? Are you working to build systems in the communities that will support this technology for the long term? Thank you for your response.
Dana Frasz
Changemakers

by Aquacube on February 26, 2008 - 14:12

Dear Dana

I hope this answers your questions.

We have selected the Dominican Republic and Haiti as sites. Through strong contacts in both countries we have identified three definite and one possible site. The first units are scheduled for delivery to one orphanage and one charity children’s hospital at the end of March. The other to an orphanage in April.

The technology we have developed is based upon existing proven water treatment technology. We have not set out to re-invent the wheel. Although our V series units are a new product development, they are based upon this proven technology but modified to suit the particular requirements of rural and peri-rural communities in developing countries. Ease of use, on-board spares and consumables, fail-safe controls to ensure efficient use and adherence to maintenance regimes etc.

The social impact will be material. Haiti is trying hard to meet its Millennium Goals, including reasonable access to clean water for its population. Our units will be able to provide clean water for tens of thousands of Haitians. After the initial capital cost, the units are self funding through a small charge made to the consumers for clean water. Present estimates put the cost to consumers at less than one US cent for 10 litres.
We have visited both countries and have already identified community partners, business contacts, NGO’s and Governmental parties with whom we intend to develop the overall water provision model. Many of these organisations have representation throughout the Caribbean and Latin America. This will facilitate scaling up.
The key is of course support for the equipment in the longer term. Yes we have that very much in mind and have already began discussions with a non-profit organisation who would be responsible in Haiti for o and m as well as general care fro the equipment. The organisation has some highly qualified volunteer engineers who are happy to support the product for the medium to long term.

I hope this helps and thank you for taking the time to contact us

kind regards

Keith Gavin
Dr

by aquaya_jeff on February 22, 2008 - 20:17

Greetings Keith,

Is your plan to fabricate your systems in the UK and ship to, say Latin America or Africa? And do you see your primary market as emergency response applications, or permanent installations, or both?

Finally, your website mentions an ECA system producing ClenoxTM. Are you able to speak about the disinfectant? Is it chlorine dioxide?

Many thanks,

jeff

Jeff Albert, PhD
Principal, The Aquaya Institute
www.aquaya.org

by Aquacube on February 25, 2008 - 05:32

Hi Jeff

We plan to fabricate the first few systems in the UK. These will act as quality and manufacturing benchmarks. Thereafter we intend to fabricate as locally as possible. We have already identified a suitable manufacturing partner in the Dominican Republic.

We see our markets in both of the sectors you mention. We have a range of machines which can be deployed in emergency situations, similarly we have machines which, while easy to locate, favour a more permanent infrastructure.

ClenoxTM is a electro-chlorination process producing a mixed oxidant, chlorine type disinfectant.

Regards

Keith

Dr Keith Gavin
DPM Aquacube

by aquaya_jeff on February 25, 2008 - 14:12

Thanks Keith. That's useful.

Presumably you'll need to import filter and/or Clenox production components even if you do assembly locally?

all the best
jeff

by Aquacube on February 26, 2008 - 14:14

Yes Jeff

there will have to be some importing in the early stages but we hope to try and source as much locally as possible.

best regards

Keith

by water washer on February 22, 2008 - 16:00

Hi Keith,

I second the question raised by Dr. Byamukama...this is a recurrent question that needs to be addressed in many of the efforts...the "scientific" part of treating water.

On the other hand, I would like to suggest/recommend that you contact the UN and other international organizations such as the Red Cross or Red Crescent and seek ways in which to "demo" your ideas and technology with them...the needs for disaster relief water treatment are always in front of us and if your technology can be applied there it will certainly be well received.

I did some work a few years ago with a fellow by the name of Roddy Tempest...you can see some of what he does here http://www.pqmd.org/publish/Publish_item.asp?ID=351

All the best,
Brian

by Aquacube on February 25, 2008 - 05:22

Thank you taking the time to email us.

We have been in contact with ICRC,IFRC,UNHCR,UNICEF and a number of other organisations. We have also been working with Oxfam GB on development and final testing of the system. The testing has now been going on for about 9 months and is now approaching completion of these tests. At that point we will be following up with our contacts at each of these organisations.

best regards

Keith

Dr Keith Gavin DPM Aquacube

by byamukamad on February 21, 2008 - 03:22

Dear Ron,
Thanks for what sounds like an interesting decentralised water treatment system. You mention that this sytem can be configured to remove pesticides and other agricultural chemicals, may be you need to highlight on what kind of raw water can be used with this kit. Additionally, what kind of technology is it using? As you might be well aware the quality of raw water is very important as it affects and limits most of the treatment approaches that are currently available , for both Centralised conventional technologies and small scale such as household level treatment.

Dr. Denis Byamukama
Faculty of Science
Makerere University
P. O. Box 7062
Kampala, Uganda
Tel: +256 782 519315
Current Status: Staff

by Aquacube on February 21, 2008 - 08:42

Dear Denis

thank you for your comments, I would respond as follows:

The system is designed to treat most fresh (non-saline) water sources, but
we also supply systems to treat brackish and saline sources. You are
correct in your statement that the quality of the raw water limits the
effectiveness of water treatment technologies, which is why we utilise a
modular approach to our water treatment technologies, enabling the correct
technology to be used for specific water sources

I hope this helps

Kind Regards

Dr Keith Gavin

by Ronald Rivera on February 19, 2008 - 07:59

Keith
Good to hear about your innovation. Could you share with us how much a system costs to purchase for a the 15,000 people you mention?
What country has it been installed in?
peace

Ron Rivera
International Coordinator
Ceramic Water Filter Program
Potters For Peace www.pottersforpeace.org
Managua, Nicaragua
tel: 505 277 3807
pottersforpeace@yahoo.com

PFP is a Member of The International Network to Promote H

by Aquacube on February 19, 2008 - 08:06

Thanks for the communication Ron

We have not arrived at a firm price yet but it would be more than US$5,000 and less than $20,000. this would include the provision of spares and consumables for at least 6 months operation and the equipment should last for at least 3 years. We want to work on a whole life cost per litre of water produced and as you can probably gather with the numbers involved, the cost per litre is a small fraction of a US Cent per hour.

Hope this helps

Keith