Tech
Low-grade heat from renewable sources could be used to desalinate water
A McGill University-led research team has demonstrated the feasibility of a sustainable and cost-effective way to desalinate seawater. The method—thermally driven reverse osmosis (TDRO)—uses a piston-based system powered by low-grade heat from solar thermal, geothermal heat and other sources of renewable energy to produce fresh water.
Though previous research showed promise, this study is the first to analyze TDRO’s thermodynamic limits. The results have brought researchers closer to realizing the technology which could improve access to water and increase the sustainability of infrastructure.
“Most desalination is done by reverse osmosis, which uses electricity to drive water through a membrane,” said Jonathan Maisonneuve, study co-author and Associate Professor of Bioresource Engineering.
“The challenge with using heat is that it takes a lot of it to do what you could with a little bit of electricity. So, if we can find a way to harness existing heat from renewable sources, that could be very advantageous, because it’s so abundant,” Maisonneuve said.
“Thermally driven reverse osmosis: thermodynamics of a novel process that uses heat for desalination and water purification,” by Saber Khanmohammadi, Sanjana Yagnambhatt, Dan DelVescovo and Jonathan Maisonneuve, was published in Desalination on Oct. 15, 2025.
Addressing the water and energy crises
Electricity-based desalination, which is often inaccessible in remote areas, requires about one to four kilowatt hours (kWh) to produce one cubic meter of fresh water.
According to the researchers’ analysis, which optimized several elements of a design proposed by MIT researcher Peter Godart, TDRO would require 20 kWh per cubic meter.
“There’s still a big difference when you compare it to one to four kWh, but because heat is cheaper than electricity, we don’t have to totally close that gap,” Maisonneuve said.
TDRO works by heating and cooling a small amount of fluid in a sealed chamber, known as the working fluid. This temperature fluctuation expands the working fluid, causing it to drive a piston to push seawater through a reverse osmosis membrane—effectively combining a thermodynamic cycle with water purification.
By studying and optimizing the ratio of working fluid to seawater fluid, as well as the piston sizes, the researchers demonstrated that TDRO has better performance potential than previously thought. The method also compares well against existing thermal desalination technologies, but they say further study is required.
“Next, we need to model it in detail, see how quickly the system can operate and introduce a number of non-ideal effects, such as heat loss through the environment,” Maisonneuve said.
More information:
Saber Khanmohammadi et al, Thermally driven reverse osmosis: thermodynamics of a novel process that uses heat for desalination and water purification, Desalination (2025). DOI: 10.1016/j.desal.2025.119103
Citation:
Low-grade heat from renewable sources could be used to desalinate water (2025, November 14)
retrieved 14 November 2025
from https://techxplore.com/news/2025-11-grade-renewable-sources-desalinate.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.
Tech
One of Our Favorite 360 Cams Is 35 Percent Off
Tired of taking your action camera on an adventure, only to get home and find out you missed the action with a bad angle? One option is to switch to a 360-degree action cam, so you can capture all of the action and then edit down to just the good stuff later. One of our favorite options, the DJI Osmo 360, is currently available for just $390 on Amazon, a $209 discount from its usual price, and it comes with a selfie stick and an extra battery.
The DJI Osmo 360 achieves its impressive all-around video quality by leveraging a pair of 1/1.1-inch sensors, larger than some other offerings, and by supporting 10-bit color. You can really see that in the camera’s output, with colors that are vivid and bold, to the point that you may need to dial them back a bit in post if you want something more natural. With support for up to 50 frames per second at 8K when recording in 360 degrees, or 120 fps at 4K when shooting with only one sensor, you’ll have plenty of material to work with. In our testing, it ran for just shy of two hours at 30 fps, which is also around the time the internal storage had filled up anyway.
If you plan on catching any serious discussions with your Osmo 360, you’ll be pleased to know it connects directly to DJI’s line of wireless lavalier microphones, including the excellent and frequently discounted DJI Mic 2 and Mic Mini. If you want to mount it to something other than the included 1.2-meter selfie stick, it has both DJI’s magnetic attachment system and a more traditional ¼”-20 tripod mount. The DJI Mimo app lets you control the camera and adjust any settings, and there’s even a simple editor for on-the-fly production. For desktop users, DJI Studio has even more in-depth settings and editing options, in case you don’t want to pay for Premiere.
The DJI Osmo 360 is one of our favorite action cameras, and is particularly appealing at the discounted price point, but make sure to check out our full review for more info, or head over to our full roundup to see what else is available.
Tech
Artemis II: Everything We Know as Its Crew Approaches the Far Side of the Moon
On day six of its mission, Artemis II is closing in on the far side of the moon. Meanwhile, the historic journey has not been without fascinating and curious stories, from the images and videos that its four crew members have shared with the world to the inevitable unforeseen events—including a tricky toilet situation.
A few hours before the crew begins its lunar flyby, here’s how things are going on Artemis II.
When Will They Reach the Far Side of the Moon?
While Artemis II won’t actually land on the moon (that won’t happen until Artemis IV), that does not make this mission any less compelling. Once the Artemis II astronauts finish flying over the dark side of the moon, they will have the historic distinction of being the humans who have traveled the farthest from Earth.
They will also test all the systems needed for future lunar missions, validating life support, navigation, spacesuits, communications, and other human operations in deep space.
But when are they supposed to reach this far-off point? First, the Orion capsule reached what is known as the moon’s “sphere of influence” on Sunday night. This is the point where the moon’s gravitational force is stronger than the force of the Earth.
At present, Orion is circling the moon. Once the capsule is on the dark side of the moon, approximately 7,000 kilometers from the surface, communications with Earth will be interrupted. For six hours, they will be able to view the far side of the moon, something no human being has ever seen with their own eyes—not even the astronauts of the Apollo program, as this region of the moon was always too dark or difficult for them to reach.
That six-hour flyby of the dark side of the moon is expected to begin Monday, April 6, at 2:45 pm EDT and 7:45 pm London time.
After that, the capsule will use the moon’s gravity to propel itself back to Earth. Splashdown, when the astronauts reach Earth, is scheduled for April 10 in the Pacific Ocean, not far from the coast of California, the tenth day of the mission.
Remember that you can follow the live broadcast of the Artemis II mission from NASA’s official channels.
What Has Happened so Far?
Since its successful launch on April 1 from Kennedy Space Center, the Artemis II crew has shared several spectacular photos, such as the featured image in this post, which shows mission specialist Christina Koch looking down at Earth through one of Orion’s main cabin windows.
This incredible photo of a Earth, taken on April 2, went viral on social media, referencing the famous “Blue Marble” image captured by the Apollo 17 astronauts in 1972.
View of Earth taken by astronaut Reid Wiseman from the window of the Orion spacecraft after completing the translunar injection maneuver on April 2, 2026.Photograph: Reid Wiseman/NASA/Getty Images
Tech
The DOJ Misled a Judge About How It’s Using Voter Roll Data
Last week in Rhode Island, in a hearing over the Trump administration’s efforts to access the state’s unredacted voter lists, US district judge Mary McElroy asked a Department of Justice lawyer what the agency had been doing with the voter roll data it already amassed from other states in recent months.
“We have not done anything yet,” said Eric Neff, the acting chief of the agency’s voting section, a core part of the DOJ’s civil rights division that focuses on enforcing federal laws that protect the right to vote. Neff added that the data the DOJ collected from states—which can include Social Security numbers, drivers licenses, dates of birth, and addresses—was being kept separate.
“The United States is taking extra concern to make sure that we’re complying with the Privacy Act in every conceivable way,” Neff added. The Privacy Act of 1974 regulates how government agencies collect and use personally identifiable information about US residents.
But Neff was not telling the truth: The DOJ, he later admitted, was pooling the data and already analyzing it to identify voting irregularities.
In a court document filed on March 27, Neff walked back his claims. “The United States represented that each data set was stored separately,” Neff wrote. “The United States also stated that no analysis had yet been conducted on the data. To correct and clarify the record, preliminary internal data analysis of the nonpublic voter registration data has begun. In particular, the Civil Rights Division has begun the process of identifying and quantifying the number and type of duplicate and deceased registered voters in each state.”
The revelation confirms what was widely speculated, which is that the DOJ appears to be pooling the data and using it to identify potential issues with suspected voting irregularities ahead of the midterms, which is a core part of Trump’s broad attack on elections.
Neff and the DOJ did not respond to repeated requests for comment.
Critics have grown increasingly concerned about the DOJ’s voting section, which has undergone a stark transformation since President Donald Trump has retaken office. A newly installed coterie of inexperienced but ultra-loyal lawyers in the DOJ’s voting section, many of whom have supported election denial conspiracy theories, have spent their time on forcing states to hand over their voter roll information.
The initiative began in May last year, when the Department of Justice sent letters to election officials in at least 48 states and Washington, DC, asking for unredacted voter rolls. Some Republican-led states immediately handed over the information, but dozens of others pushed back. As a result, Neff and his colleagues have sued 30 states, asking courts to force them to hand over the information. So far, courts have sided with the states, with judges already dismissing cases in California, Michigan, and Oregon.
In many of the lawsuits, state election officials pointed out the huge security risk involved in sharing such sensitive data, especially when it was unclear how the data would be stored or who it would be shared with. “We still have no idea what the government is doing with this data,” says David Becker, the head of the Center for Election Innovation and Research and a former Justice Department lawyer. “No idea where it is being stored, how it is being protected, or who has access to it. This data is incredibly sensitive. If someone has any of these three data points on any of us, Social Security number, driver’s license number, or date of birth, they can wreck us financially. This is why the states protect this data, and they do a good job of it.”
-
Sports1 week agoUSMNT handed reality check by Doku, Belgium ahead of World Cup
-
Uncategorized4 days ago
[CinePlex360] Please moderate: “Trump signals p
-
Sports1 week ago2026 NCAA men’s hockey tournament: Schedule, results
-
Uncategorized1 week ago
[CinePlex360] Please moderate: “Further tariff
-
Entertainment3 days agoJoe Jonas shares candid glimpse into parenthood with Sophie Turner
-
Tech3 days agoOur Favorite iPad Is $50 Off
-
Politics7 days agoTrump considers asking Arab allies to help to pay for Iran war
-
Sports7 days agoFakhar Zaman denies ball-tampering charge in PSL match | The Express Tribune
