Saving the planet with desalination
With the world’s population rising and the globe steadily warming, the crisis surrounding the fresh water supply is on the lips of every environmentalist group with a voice. Some, like the Guardian, go so far as to say: “Fresh water shortages will cause the next great global crisis.”
Earlier this year in São Paulo, Brazil, droughts struck so badly that residents were forced to drill through their basements and car parks to reach fresh water. Statistics from the World Preservation Foundation show that the water around the globe is rapidly fading. Of the world’s major rivers, at least one third are disappearing or have disappeared and the groundwater wells for billions of people are rapidly drying up.
California suffered its fourth consecutive year of drought with officials reporting that 2015 has been the driest since meteorological records began. The problem has been hugely exacerbated by the rise in water use per person.
Water overuse and poor rainfall is also a problem which affects the Middle East, where vast areas of lush countryside have been ravaged and reduced to barren desert land. As crown prince General Sheikh Mohammed bin Zayed al-Nahyan of the UAE states: “For us, water is more important than oil.”
The list of depleting water sources covers all corners of the World:
- China – Salween
- Europe – Danube
- South America – La Plata
- North America – Rio Grande
- India – Ganges
- Pakistan – Indus
- Africa – Nile and Lake Victoria
- Australia – Murray-Darling
- South East Asia – Mekong-Lancang
- China- Yangtze
It’s clear that drastic action needs to be taken, and now!
Desalination: a solution?
With 99% of Earth’s surface water being inconsumable seawater, could there possibly be a solution there somehow? The human body can not digest salt water, it’s a fact! Desalination/distillation was used in ancient times on board ships and is one of mankind’s earliest forms of water treatment. Desalination is simply the scientific method of removing salt from water through boiling the water, capturing the salt free vapour and turning it back into clean water – sounds easy! It does however require large scale facilities and a process that is expensive and energy-intensive.
To understand the concentrations of salt here is a guideline where ppm is the weight of the salt in parts per million:
- Fresh water – Less than 1,000 ppm
- Slightly saline water – From 1,000 ppm to 3,000 ppm
- Moderately saline water – From 3,000 ppm to 10,000 ppm
- Highly saline water – From 10,000 ppm to 35,000 ppm
- Ocean water – 35,000 ppm
In spring 2015 the first US desalination plant began its operations, producing over 3.5 billion gallons of consumable water a day. With over 120 countries in the world, including:
- Saudi Arabia,
also operating desalination plants, it’s clear this could well be a solution to a very real problem. With plans in many more countries to follow suit and the hope that technological advances will bring down the cost of water desalination processes, the question “can we drink sea water?” could become as obsolete as the phrase “world water shortage“. Wouldn’t that be amazing!
[Photo by archbob]
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