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On this page, a commercial water treatment system is presented. The information on this page has been provided by the company who produce the products, and has not been checked by Akvo. The appearance on this page does not mean that Akvo endorses the product. If you would like to add a product, please contact m.t.westra[[Image:At.png|14px]]akvo.org.   [[Image:naiade1.jpg|thumb|right|150px| The Naiade water purification unit used in India. Note the PV panel above the unit.]][[Image:naiade2.jpg|thumb|right|150px| The Naiade water purification unit.]]  The Naiade water disinfection unit is a spin-off from Nedap’s and Trojan’s know-how of large scale drinking water and industrial waste water treatment plants. The Naiade drinking water disinfection unit very effectively combines the potential offered by solar energy, UV light and battery back-up. The Naiade has been designed to remove bacteria, protozoa, viruses and colloidal parts from raw sweet water. It operates without the use of fossil fuel or chemicals.  The unit is made of tropical resistant poly ethylene. Its dimensions are 150 x 50 x 50 cm.The purification of the Naiade are: # a sieve to remove larger parts such as leaves, stones etc.# a 25 micron filter bag# a 10 micron filter bag # a UV light, which kills any remaining bacteria and viruses {{procontable | pro=- Immediate use after installation <br>- Supply for great number of people <br>- High yield <br>- State-of-the-art UV technology <br>- Robust technology <br>- Use of re-usable materials<br>- Independent of fossil fuel or electrical network <br>- Alternative to liquid chlorine disinfection <br>- Environmentally friendly <br>- The use of a native speaking sales and distribution network <br>| con }} ==History and social context==

 ==What is a Naiade?==The Naiade water disinfection unit is a spin-off from Nedap’s and Trojan’s know-how of large scale drinking water and industrial waste water treatment plants. The Naiade drinking water disinfection unit very effectively combines the potential offered by solar energy, UV light and battery back-up. The Naiade has been designed to remove bacteria, protozoa, viruses and colloidal parts from raw sweet water. It operates without the use of fossil fuel or chemicals.  The unit is made of tropical resistant poly ethylene. Its dimensions are 150 x 50 x 50 cm. ==How Does It Remove Contamination?=Operation=The purification of the Naiade are: # a sieve to remove larger parts such as leaves, stones etc.# a 25 micron filter bag# a 10 micron filter bag # a UV light, which kills any remaining bacteria and viruses ==Operation==

==Technical details==The unit does not contain any moving parts except for the electro-magnetic tap. It is made of tropical resistant poly ethylene. All material as well as the applied technology is based on the intensive use in remote and tropical areas. The unit has been designed for operation under harsh conditions in grass root societies. Units can be installed, operated and maintained by people with no or little/low technical education or background. The estimated lifespan of the unit is over 10 years. Filter bags and UV lamps may need earlier replacement. ==Advantages==* Immediate use after installation* Supply for great number of people* High yield* State-of-the-art UV technology* Robust technology* Use of re-usable materials* Independent of fossil fuel or electrical network* Alternative A supervision structure to liquid chlorine disinfection* Environmentally friendly* The guarantee optimal use of a native speaking sales and distribution network ==Country experiences==Naiade projects have been realized in Afghanistan, India, Sri Lanka, Pakistan, Indonesia, China, Brazil, Surinam, Mexico, Colombia, Morocco, Senegal, Sudan, Mozambique, Madagascar, Burkina Faso, Ghana, Tanzania, Cameroon, Benin, Mali, Egypt, South Africa, Kenya, Nigeria.  ==Maintenance requirements==Both filter bags can be removed from the unit for cleaning purposes. After careful flushing these bags can be replaced. The life span of the UV lamp is 10,000 operating hours, nearly 3 years. The UV lamp can be replaced within half an hour by the users themselves. The cleaning procedure should be as follows:* Daily cleaning the PV panel for optimal energy supply* Regular rinsing or washing of the filter bags to avoid blockage by sediments or a micro biological layer* Regular cleaning of the glass tube of the UV lamp to avoid sedimentation. This highly depends on the chemical consistency/content of the raw water. A colored LED indicates the status. After 8,000 hours of use the unit starts giving warning for necessary replacement of the UV lamp, although the users still have 2,000 hours of use to exchange the UV lamp. After 10,000 hours the unit will not supply any water until the old UV lamp has been replaced.Replacement of the UV lamp can be done on the spot by just undoing four screws.The UV lamp is a standard industrial UV lamprecommended.

====Treatment efficiencyEfficiency====

A supervision structure to guarantee optimal use is highly recommended==Country experiences==Naiade projects have been realized in Afghanistan, India, Sri Lanka, Pakistan, Indonesia, China, Brazil, Surinam, Mexico, Colombia, Morocco, Senegal, Sudan, Mozambique, Madagascar, Burkina Faso, Ghana, Tanzania, Cameroon, Benin, Mali, Egypt, South Africa, Kenya, Nigeria.  ==Manuals==

*[https://filehost.nedap.com/index.php?q=321999ab3f0c61b2f285d0d1dfcd7024&action=0 A short film made by the French TV2 team about the effectiveness of the Naiade in India]

====Company information==Information==

==External linksLinks==