Turning Salt water into Drinking water using Solar power | QPT


According to the Securing Water for Food agency,
between 2000 and 2050 water demand is expected to increase 55 percent globally, meaning the
number of people affected by water scarcity will continue to grow. By 2025, two-thirds
of the world’s population could be living in severe water stress conditions. Around the world, there is more salty groundwater
than fresh, drinkable groundwater. For example, 60 percent of India is underlain by salty
water — and much of that area is not served by an electric grid that could run conventional
reverse-osmosis desalination plants. To find solution for this drinking water issue
in developing countries, USAID the U.S. Agency for International Development had run a global
competion for Desal prize. The idea for the competition was to create
a system that could remove salt from water and meet three criteria: it had to be cost-effective,
environmentally sustainable, and energy efficient. The winners of the $140,000 first prize were
a group from MIT and Jain Irrigation Systems. The group came up with a method that uses
solar panels to charge a bank of batteries. The batteries then power a system that removes
salt from the water through electrodialysis, that means that dissolved salt particles,
which have a slight electric charge, are drawn out of the water when a small electrical current
is applied. Using the sun instead of fossil fuels to power
a desalination plant isn’t a totally new idea. Larger solar desalination plants are being
seriously investigated in areas where water is becoming a scarce resource, including Chile
and California.But the current technology is expensive. The MIT team’s this new desalination technology
“electrodialysis” is comparatively less expensive. Both electrodialysis and reverse osmosis require
the use of membranes, but the membranes in an electrodialysis system are exposed to lower
pressures and can be cleared of salt buildup simply by reversing the electrical polarity.
That means the expensive membranes should last much longer and require less maintenance.
In addition, electrodialysis systems recover a much higher percentage of the water — more
than 90 percent, compared with about 40 to 60 percent from reverse-osmosis systems, a
big advantage in areas where water is scarce.

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15 thoughts on “Turning Salt water into Drinking water using Solar power | QPT

  1. what I dislike about the commercial application of this hardware is the question of how much rainfalls over the oceans, and what waters we use in the mainlands stay localized. over a small amount of time, the salination of the ocean will seem minimal. but over time without treatment, it will be like the town peeing in the public pool, eventually it will become too salty and not recoverable. there is a saying there is never going to be any more, or any less water on this planet. it just matters about where it is distributed.
    I feel as if converting the salinated waters into a mineral form and relocating it off site, say in a quarry that has been mined out and sitting idle, may seem like a better alternative. releasing the evaporated waters into the atmosphere will contribute the steam to the cloud population and create fresh water rainfall. the side effect I could see to the quarry would be if it bleeds into ground waters and over salts the soils in local farm lands creating a "idiocracy" like drought.

  2. Make it yourself thanks to Avasva solutions. I think it's the best way to learn how to build it in the cheapest way.

  3. Hi Sir thanks for sharing the video..

    In continuation to the subject, currently am facing problem with my mango garden:

    1. My bore water is converting from good water to salt water due to scarcity of rain fall.
    2. Is their any company which can provide machinery to solve the problem.
    3. if so what's the cost of the machinery (3000 ltrs/Day).

    Your answer will be highly appreciated ..

  4. Sir, I want to agriculture useag, which unit is better for it. Daily 10k liter is enough. Please reply your advice

  5. Am from india….where in my land. I got a borewell..water is sufficient but its salty..could not grow commercial vegetablea like onions..where my native villagers growing tonnes of onions and makong money .as they have good water fecility…and am quite depressed about it..so.please give advise to turn my salty water into agriculture usable water….and. may i know how.much this electrodyalysis cost to cultivate 3 acres of land

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