Tag archives for water

Swedish invention turns air into drinking water

water-dropsMaking water from air? Photo: s_gibson72 (CC: BY NC ND)

Around the world, nearly one billion persons are lacking clean drinking water. But in the future, maybe more people who live in drought affected areas can solve their most imminent problems by a technology developed by two young Swedish inventors. Recently Jonas Wamstad and Fredrik Edström won a prize of 75.000 Swedish Kronor (about 8.200Euro) for their invention, which takes advantage of the sun to extract humidity from the air, without using any electricity. By putting up solar panels on roofs the air is heated up and the water steam absorbed. About three litres of water can be harvested per square metre solar panel and day. Read more » >>

World Water Week: Mobile phone water testing, scary news and new insights

Stockholm-Water-Junior-Prize

2011 Stockholm Junior Water Prize. Winner Alison Bick together with Sweden's Crown Princess Victoria. Photo: Cecilia Österberg/Exray

The World Water Week has filled Stockholm with water-related events all week. On Tuesday, this year’s Junior Water Prize was announced, going to American 17 year old Alison Bick, who has spent four years developing a low-cost portable method to test water quality. The reason why Alison Bick has spent four years working on this project, writes the Swedish environment magazine Miljöaktuellt (in Swedish), is that her home region was flooded and the media that the water wasn’t safe to drink. This made Alison start thinking about if there could be a way to measure water quality with things you have at home. Her idea combines micro-fluidic devices, cell-phones, and chemical indicators and does not only accurately assess the bacteria content of water. It is both significantly faster and up to 200 times less expensive than standard testing procedures.

But all water news haven’t been as positive during this World Water Week. One problematic area concerning Sweden a lot is the Baltic Sea. Daniel Conley, who is a professor at Lund University, has taken a closer look at the levels of oxygen in the coastal areas of all the countries surrounding the Baltic. The result is disheartening: The lack of oxygen is worse than the researchers had thought, reaching much closer to land than before.
The big problem of the Baltic is that a lot of nutrients leak out in the water, making the algae grow in abnormal quantities. When these algae die, they sink to the bottom, consuming all the bottom oxygen when they decompose.
– We have to reduce the emissions [of nutritients] or this problem will just grow worse, says Daniel Conley to Dagens Nyheter.

Another one was this, reported in an interview by Miljöaktuellt (in Swedish): Sweden’s drinking water, that we often boast about, might not be as good as we think. During the last two years we have had two outbreaks of water-transmitted infections and a lot of our water purification plants still don’t have the equipment to deal with this kind of parasites, says Erika Lind who is national drinking water coordinator at the National Food Administration. To keep a good water quality, especially in the light of climate change, Sweden needs to deal with the risks associated with our drinking water, she says.
– If nothing bad happens you don’t do anything about it – and that’s how we have lived until now.

One week full of water discussions of course contains a lot more than this. A nice sample collection of that can be found at WaterCube.tv that have made short interviews with the participants. Watch this one, where Phd and Masters students, Karin Edberg and Melissa Denbaum talk about their insights during the week.

 

More about World Water Week in Swedish media (in Swedish, but can be translated here):
Miljöaktuellt: Here’s the inventor who might be able to solve the world’s water problem

Will big cities have enough water?

Water-in-Cairo

Water in Cairo, Egypt, on of the mega cities being discussed at the World Water Week in Stockholm. Photo: Jakob Granit, SIWI.

In a world where most of us live in cities, and the urban population grows by 2 persons every second, water can be a big problem, whether it’s flooding the streets, disappearing or being polluted. So how secure everyone’s access to clean water? That’s the focus of this year’s World Water Week, which begun yesterday here in Stockholm.

Around 2 500 politicians, business leaders, innovators, and representatives of international organisations from allover the world have gathered to penetrate these issues from all angles. To start off on a truely international note, nine mayors and other high-rank representatives from cities in for example China, India, Rwanda and France will start the week by discussing their different challenges when it comes to giving their citizens good water. The World Water Week will also bring up questions like rising sea levels because of climate change, health issues and how to reduce water usage.

For anyone interested in these issues, there’s a good opportunity to follow several of the seminars in live webcasts at this web page.

 

More about Word Water Week in Swedish media (in Swedish, but can be translated here):
Dagens Nyheter “The water crisis can lead to conflicts across the borders” (Op-Ed article by Jae So, head of Water and Sanitation Program)

Cleaning water with sunlight

Solvatten-in-Kenya

Solvatten is used in several countries in the global South. Photo: Solvatten AB.

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Petra Wadström receives a prize check for her invention Solvatten.Photo: Mia Åkermark, Orasis foto.

Sweden isn’t exactly the most sun-spoilt country in the world, but the last few years some interesting ideas on how to use sun light to clean water have been born here. Last week Petra Wadström was awarded a sustainability prize for her invention Solvatten (“Sunwater”).

Most of us already know that boiling is a good way of making water safe to drink. But UV light is also a good way of killing harmful micro-organisms. The Solvatten container uses heat, UV radiation and a built-in filter to clean contaminated water from bacteria, viruses and parasites with no use from chemicals, and the sun as only energy source. In places with good sun access it can be used up to three times a day, purifying about 20-30 litres of water.

Another Swedish invention which cleans water with sun power is the SolarWave mobile water purification system, that can treat up to 700 litres of water per hour.

In a world where 1.1 billion people lack access to a safe drinking water supply, cheap and environmentally friendly ways to purify water are desperately needed. Solvatten is already in use in several projects in the global South, like Kenya and Nepal. In countries where it’s the women who have the main responsability to provide drinking water, this also has social consequences. As the husband of a Kenyan woman says on the Solvatten web site:

“My wife used to use a lot of firewood before to boil water. It took a long time and the water tasted of the smoke. The Solvatten water tastes sweet, and now we can spend time doing other things. She uses the hot water for cooking as well, and spends less time in the kitchen.”

Here’s a short clip where Petra Wadström explains how Solvatten works:

The link between men and fish

 

fishing-on-the-ice

Ready for some ice-fishing. But soon there'll only be water flowing here... Photo: Johan Dahlenius/Flickr.

I just said goodbye to winter with a few days in the beautiful skiing tracks of Sälen [map], where a radiant spring sun made the snow start to melt, drip from house roofs and murmur through mointain streams. On the way home we saw people sit on the frozen lakes, fishing through drilled holes in the ice. Soon all that ice and snow will be water. And water was actually the theme of the day on Tuesday, which was UN World Water Day.

The same day this year’s winner of the Stockholm Water Prize was announced. Stephen R. Carpenter is an American professor of Zoology and Limnology at the University of Wisconsin-Madison and with his research shows how lake ecosystems are affected by the surrounding landscape and by human activities.

Within the research community Stephen R. Carpenter is maybe best known for his research on what is called trophic cascades. That is a concept describing how impacts on one species in an ecosystem will “cascade” up or down in the food chain and create a wider impact. For example overfishing of large fish in a lake can lead to fewer small fish. That means more zooplankton further down the food chain, since there is no one to eat them. That, in its turn, means more algae and more eutrophication.

This research has given concrete tools for restoring eutrophicated lakes, which have been used for example in Finjasjön in the south of Sweden [map] (The whole story of lake Finjasjön’s restoration can be read here)

The prize ceremony, where professor Carpenter will receive 150 000 dollars, will be held during the World Water Week in Stockholm on August 25.

trophic-cascades

An example of trophic cascades. Source: Anthony Thorpe Lakes of Missouri Volunteer Program.