Solvatten

SOLVATTEN is a combined portable water treatment and solar water heater system that has been designed for use at the household level in the developing world. The device uses natural UV radiation to treat water, and units are capable of rendering highly contaminated water drinkable (as defined by the WHO safe drinking water standards.[1]) in a few hours, provided there is sufficient sunlight.

SOLVATTEN
A SOLVATTEN unit
Founded2006, 2013
TypeAktiebolag, Foundation
FocusWater, Health, Energy
Location
Area served
Worldwide
Key people
Petra Wadström, CEO
Websitewww.solvatten.se

SOLVATTEN incorporates three water treatment processes: filtration, pasteurisation and UV sterilisation.[2] Under optimal conditions, the device can eliminate all pathogenic material in 10-litres of water within 2 hours,[3] allowing for multiple batches of water to be treated in a given day.

The device is typically used in situations where water resources are scarce and prone to contamination, but it has also been applied in disaster relief scenarios.[4] The device and its inventor, Petra Wadström, have both achieved recognition through a series of national and international awards.

Design and Usage

Each SOLVATTEN unit consists of two five-litre containers that have transparent surfaces and can be filled with water. The transparent surfaces of the containers are made from a plastic that allows the penetration of a large portion of UV light, specifically UV-B which is highly effective at destroying microorganisms. Water is poured in through an opening that houses a filter of 35 microns to remove larger particles[5]

Once filled, the unit is placed in direct sunlight, which simultaneously heats the water and exposes it to ultraviolet radiation. The combination of these is an effective means of purifying water and, depending on conditions, the water will be free of pathogenic material in 2–6 hours. The water is heated to between 55 and 75 °C,[2] making it suitable for a number of other household and hygiene purposes, such as hand washing, bathing and domestic cleaning.

A study has shown that the use of SOLVATTEN is associated with health improvements in communities that are dependent upon contaminated water resources. It showed that it eliminated 100% of pathogenic material from water sourced from contaminated wells, whilst its use was also associated with as 60% reduction in diarrhoeal infections in children under five years old.[6]

The study, conducted in Mali, showed that households using SOLVATTEN reduced their combustion of firewood and charcoal by an average of 0.5 and 0.9 kg/day respectively.[6] This had additional economic benefits for the user, with average savings of 15.8 USD/month.[6] A separate research exercise calculated the social return on investment (SROI) of SOLVATTEN, which accounts for extra-financial value (e.g. environmental and social value not reflected in conventional financial accounts) relative to resources invested. In that study, the SROI was calculated as being 1:26, meaning that for every unit of currency invested in SOLVATTEN, 26 were created[3]

Awards and recognition

SOLVATTEN was designed by the Swedish inventor and environmentalist Petra Wadström. Wadström has been recognised as one of Sweden’s most prestigious modern entrepreneurs and environmentalists, whilst the SOLVATTEN device itself has been acknowledged as a significant innovation. Below is a list of some of the awards received by both Wadström and her invention.

AwardAwarding bodyRecipientYear
Panellist Nobel Week Dialogue Water Matters Nobel Prize Petra Wadström 2018
Sweden's 100 most influential environmentalists[7]MiljöaktuelltPetra Wadström2014
Sweden's top 100 women[8]Expressen newspaperPetra Wadström2014
The Polhem Prize[9]Sveriges IngenjörerPetra Wadström/Solvatten2013
The Energy Globe Award Mali[10]Energy GlobeSolvatten2013
Outstanding Achievement Award 2012[11]Sveriges IngenjörerPetra Wadström2012
SACC NY Deloitte Green Award[12]Swedish-American Chamber of CommerceSolvatten2011
Änglamarks Prize[13]COOPPetra Wadström2011
Best Green New Product Innovation[14]International Green AwardsSolvatten2011
Climate Solver[15]WWFSolvatten2009
Skapa Prize[16]Stifelsen SKAPAPetra Wadström2008
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References
  1. Climate Solver: Solar safe water system
  2. Lundström, H. & Hagström, E. A field study in Kenya of insolation parameters to make water drinkable in the household water treatment unit SOLVATTEN. Uppsala University, Sweden
  3. Jönsson, J., Wikman, A. & Wätthammar, T. (2011) Social Return on Investment, SROI, the value added for families before and after using Solvatten in the Bungoma district in Western Kenya. Swedish University of Agricultural Sciences (SLU), Uppsala
  4. Solvatten use following Typhoon Yolanda (in Swedish)
  5. Solvatten product brochure Archived 2014-03-09 at the Wayback Machine
  6. Diop, B. S. (2012) Sanitary, economic and environmental impacts of Solvatten in the West African peri-urban context: case of Dialakorodji, Bamako (Mali). University of Dakar, Senegal.
  7. Sweden's top 100 environmentalists 2014
  8. Sweden's top 100 women 2014
  9. Polhempriset 2013
  10. The Energy Globe Awards 2013
  11. Soroptomists Sweden Archived 2014-07-02 at Archive.today
  12. SACC NY Deloitte Green Award 2011
  13. Änglamarks Prize 2011 Archived 2013-10-22 at the Wayback Machine
  14. International Green Awards 2011
  15. WWF Climate Solver 2009
  16. Skapa Priset 2008 Archived 2015-03-27 at the Wayback Machine
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