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.
Now an analysis by MIT researchers shows that a different desalination technology called electrodialysis, powered by solar panels, could provide enough clean, palatable drinking water to supply the needs of a typical village. The study, by MIT graduate student Natasha Wright and Amos Winter, the Robert N. Noyce Career Development Assistant Professor of Mechanical Engineering, appears in the journal Desalination.
Winter explains that finding optimal solutions to problems such as saline groundwater involves “detective work to understand the full set of constraints imposed by the market.” After weeks of field research in India, and reviews of various established technologies, he says, “when we put all these pieces of the puzzle together, it pointed very strongly to electrodialysis” — which is not what is commonly used in developing nations.
The factors that point to the choice of electrodialysis in India include both relatively low levels of salinity — ranging from 500 to 3,000 milligrams per liter, compared with seawater at about 35,000 mg/L — as well as the region’s lack of electrical power. (For on-grid locations, the team found, reverse-osmosis plants can be economically viable.)
Such moderately salty water is not directly toxic, but it can have long-term effects on health, and its unpleasant taste can cause people to turn to other, dirtier water sources. “It’s a big issue in the water-supply community,” Winter says.
Expanding access to safe water
By pairing village-scale electrodialysis systems — a bit smaller than the industrial-scale units typically produced today — with a simple set of solar panels and a battery system to store the produced energy, Wright and Winter concluded, an economically viable and culturally acceptable system could supply enough water to meet the needs of a village of 2,000 to 5,000 people. They estimate that deployment of such systems would double the area of India in which groundwater — which is inherently safer, in terms of pathogen loads, than surface water — could provide acceptable drinking water.
While many homes in India currently use individual, home-based filtration systems to treat their water, Wright says after consulting with nongovernmental organizations that work in the area, she and Winter concluded that village-scale systems would be more effective — both because fewer people would be left out of access to clean water, and because home-based systems are much harder to monitor to ensure effective water treatment.
The Latest on: Solar desalination
via Google News
The Latest on: Solar desalination
- Qeeri Water Centre is enhancing each step of Qatar’s water cycleon March 21, 2020 at 11:48 am
Meanwhile, through our 20-year agreement with Qatar Electricity and Water Company (QEWC), we are developing a pilot testing programme for multi-effect desalination (MED) technology; with the Ministry ...
- 2020 Innovations in Renewable Energy Generation, Desalination, Artificial Intelligence, LEDs and Vaccines - ResearchAndMarkets.comon March 20, 2020 at 10:03 am
The TOE also provides intelligence on the efficient conversion of carbon dioxide in to value added products and the use of passive solar power for desalination. The TOE also features innovations based ...
- Water crisis in South Africa: Solution within the government’s handon March 17, 2020 at 2:05 am
This is true if the process is supported by conventional energy sources like oil, gas and coal. In the context of current global climate change issues fossil fuels supported desalination process is ...
- Team develops thin solar heating film for efficient thermal energy harvestingon March 13, 2020 at 11:51 am
By reducing its thickness, the team improved the film’s ability to minimize heat loss. As such, the film may prove promising for applications including wastewater treatment, solar seawater ...
- Graphene solar heating film offers new opportunity for efficient thermal energy harvestingon March 13, 2020 at 7:11 am
thermophotovoltaics (directly converting heat to electricity), solar seawater desalination, wastewater treatment, light emitters and photodetectors. The researchers have developed a prototype to ...
- Report: System achieves new level of efficiency in harnessing sunlight to make fresh potable water from seawateron March 13, 2020 at 3:50 am
A completely passive solar-powered desalination system developed by researchers at MIT and in China could provide more than 1.5 gallons of fresh drinking water per hour for every square meter of solar ...
- Wajir team to rid borehole water of salty contenton March 12, 2020 at 2:49 pm
The department intends to pilot desalination in two boreholes in each of the six subcounties using reverse ... It can produce 2,000 litres of fresh water every hour. During the launch of the ...
- Sunwater chair's call for smaller water projects rejected by LNPon March 12, 2020 at 12:30 am
look at Sundrop in South Australia and how they're producing amazing quantities of tomatoes on desal and solar. "So let's turn to the other end of the equation, which is how do we produce more high ...
- World's largest desalination project in UAE secures $758mln green loanon March 11, 2020 at 10:17 pm
The Taweelah IWP project involves the design, construction, operation and maintenance of a 200 million imperial gallons per day (MIGD) desalination plant and associated infrastructure and facilities.
- Works for US$250mn desal plant in Chile to finish in Aprilon March 11, 2020 at 11:37 am
Request demo Project: Santo Domingo Desalination Plant Current stage: Updated: 1 day ago Project: Santo Domingo Current stage: Updated: 2 days ago Project: Arqueros Current stage: Updated: 3 days ago ...
via Bing News