Skip to main content

Ingenious new sewage treatment system generates electricity and clean water

newgenerator wastewater power water treatment waste purification urban plant facility
Image used with permission by copyright holder
We have a long ways to go towards a truly sustainable future. But a device called the NEWgenerator may help us get there by generating two of our fundamental needs — clean water and energy.

Developed by Daniel Yeh, an associate professor of engineering at the University of South Florida, the device is designed to kill two proverbial birds with one stone — generate power while cleaning wastewater, simultaneously solving the global need for water and sanitation. The off-grid device was recently awarded a $1.14 million grant from the Bill & Melinda Gates Foundation, which will help install the next generation of the device in Durban, South Africa.

Recommended Videos

Yeh began developing the NEWgenerator through his research on anaerobic membrane bioreactors (AnMBRs), a technology that turns sewage into biogas, which can later be used to generate electricity. Regarded as a sustainable means to treat wastewater, AnMBR is especially promising for developing regions, where water sanitation problems are most prevalent.

“I believe that it has great potential for accomplishing high performance, small-scale wastewater treatment and water recycling, bypassing vast, expensive sewer networks that are difficult to achieve in many developing countries,” Yeh told Digital Trends. “The NEWgenerator is a way for us to engineer the AnMBR into a compact, solar-powered, mini container form factor and represents the embodiment of 15 years of research on this technology.”

Beyond extracting energy, the NEWgenerator also recovers nutrients like nitrogen and phosphorus from the urine and fecal matter found in wastewater. Those nutrients could then be used as fertilizer. Though these nutrients would otherwise be recycled naturally, it would take much longer, according to Yeh. “We essentially accelerate what nature would do, with the help of engineering,” he said.

In a 2015 project, Yeh and his team field-tested a compact version of the device for a year at a school in India. “During this entire period, the NEWgen operated solely on solar energy and provided wastewater treatment and water recycling at a rate of over 100 uses per day,” he said.

Yeh and his team will now use the two-year, $1.14 million grant to begin installing improved NEWgenerators in developing regions, where sewage infrastructures struggle to keep up with increasing amounts of waste. But the researchers also think the technology could help in remote regions around the world that lack connected sewage systems.

Dyllan Furness
Former Digital Trends Contributor
Dyllan Furness is a freelance writer from Florida. He covers strange science and emerging tech for Digital Trends, focusing…
Nissan joins ChargeScape, a way for EV owners to sell watts back to the grid
electrify america home charging station for electric cars

EV owners already enjoy the benefits of knowing their vehicle is charging up quietly while they sleep. Now they can dream about how much money they can make in the process.That’s the bet Nissan is making by joining ChargeScape, a vehicle-to-grid (V2G) venture that is already backed by BMW, Ford, and Honda.ChargeScape’s software wirelessly connects electric vehicles to power grids and utility companies. When connected with ChargeScape's platform, EV drivers can receive financial incentives for temporarily pausing charging during periods of high demand. ChargeScape says they will eventually also be able to sell the energy stored in their vehicle's battery back to the power grid.
A 2021 study by the University of Rochester found that EV owners could save up to $150 a year by using V2G technology. But the technology has evolved in recent years. V2G company Fermata Energy says that in some circumstances, a customer using its bi-directional charger was able to save $187.50 in 15 minutes by drawing energy from a Nissan LEAF to avoid costly demand charges.
Nissan intends to roll out the ChargeScape technology to its EV drivers across the U.S. and Canada. The company says the move is of particular significance given its U.S. sales of 650,000 Leaf models, one of the first EVs with the capability to export power back to the grid.ChargeScape, which launched in September, is equally owned by BMW, Ford, Honda, and now Nissan. But it expects other automakers to join the party.In August, GM announced that V2G technology will become standard in all its model year 2026 models. The project comes at a time when EV sales and infrastructure growth are ramping up quickly, along with challenges for the electric grid. Simply put, more EVs on the road means more demand on utilities to provide the needed power.At the same time, more and more EV makers seek to incorporate automotive software that provide advanced driver aids and other connected features. With vehicle-to-grid (V2G) technology quickly spreading, ChargeScape is entering a landscape where competitors such as ChargePoint, Electrify America, Fermata Energy, and BP Pulse are already vying for a piece of the action.
But there is one good reason for ChargeScape to move in now: Tesla, which otherwise dominates the field in the U.S., has so far backed off from embracing V2G technology, focusing instead on its Powerwall home-battery solution to store solar energy and provide backup power. However, CEO Elon Musk has hinted that Tesla could introduce V2G technology for its vehicles in 2025.

Read more
Waymo’s Hyundai robotaxi deal may steal the show from Tesla
A Hyundai Ioniq 5 is equipped as a robotaxi.

Just days ahead of Tesla’s much anticipated robotaxi event on Thursday, Hyundai unveiled a partnership with Waymo that will add Hyundai’s Ioniq 5 to the fleet of the robotaxi operator.In the first phase of the partnership, Waymo will integrate its sixth-generation fully autonomous technology, called the Waymo Driver, into the all-electric Ioniq 5 SUV, which will be added to the Waymo One fleet over time.On-road testing with Waymo-enabled Ioniq 5s is due to start in late 2025 and become available to riders of the Waymo One robotaxi service the following year.Alphabet-owned Waymo currently operates the only functioning robotaxi service in the U.S., with a fleet of about 700 self-driving vehicles already on the road in Phoenix, Los Angeles and San Francisco. The service is also being tested in Austin, Texas.Last year, General Motors’ competing robotaxi service Cruise had to stop operations after one of its vehicles struck a pedestrian in San Francisco. Cruise’s GM vehicles are nonetheless expected to resume operations next year through a partnership with Uber.Driverless vehicles have stumbled on two main obstacles on the road to commercialization: The complexity of the technology and tight safety regulations.For now, Waymo’s existing footprint gives it a marked advantage over its competitors. Its sixth-generation technology is said to handle a wider array of weather conditions with fewer on-board cameras and sensors. In their joint statement, Waymo and Hyundai emphasized the proven safety of both the Waymo technology and the Ioniq 5. Waymo’s technology relies on pre-mapped roads, sensors, cameras, radar and lidar (a laser-light radar). It's an approach that might be very costly but has met the approval of safety regulators. All this adds pressure on Tesla to deliver the goods with the launch of its robotaxi -- expected to be called the Cybercab.Tesla’s ambition has been to eventually provide full driverless capacity directly to consumers. Tesla owners can already buy software called Full Self-Driving (FSD) that operates like an advanced driver assistance system and requires constant driver supervision.Tesla’s FSD relies on multiple onboard cameras to feed machine-learning models that, in turn, help the car make decisions based on what it sees.The technology, however, has not yet convinced all current and former traffic safety officials.

Read more
Tesla reveals price range for Optimus Gen2, its ‘robot without wheels’
Tesla's 2022 Optimus robot prototype is seen in front of the company logo.

“The future should look like the future”, CEO Elon Musk said at the Tesla "We Robot" special event held in Burbank, California, earlier this week. Sure enough, Tesla’s much-anticipated autonomous robotaxi, the Cybercab, and its large-van counterpart, the Cybervan, seemed straight out of celebrated sci-fi movies. But as the name of the event hinted at, a vision of the future would not be complete without robots: Several of the Optimus Gen 2, Tesla’s latest version of humanoid-like robot, were found serving drinks, holding conversations with guests, and even dancing at the event.Tesla has recently pitched the Optimus as a potential replacement for factory workers in China and elsewhere. Musk previously said he expects the Optimus to start working at Tesla factories in 2025 and to be available to other firms in 2026.
Yet, at the event, the Tesla boss revealed his expanded vision of a household robot that can do “everything you want: Babysit your kid, walk your dog, mow your lawn, get the groceries, just be your friend, serve drinks”.He also gave a closer estimate of the robot’s price tag: Once produced "at scale," Optimus should cost somewhere between $20,000 and $30,000. Musk had previously said the robot’s price would be about half that of a car. 
Staying true to his sci-fi vision, the Tesla CEO referred to Optimus as a cross between R2D2 and C-3PO, the famous droids from the Star Wars film series.
Ever since the first generation of the Optimus was revealed in 2022, Tesla has emphasized the continuity between its cars and the robot. “Everything that we’ve developed for our cars -- the battery power’s electronics, the advanced motor’s gearboxes, the software, the AI inference computer -- it all actually applies to a humanoid robot,” Musk said at the event. “A robot with arms and legs, instead of a robot with wheels.”
Tesla would not be the first to offer a domestic robot on the market. Hyundai-owned Boston Dynamics has already commercialized a home service-type robot called Spot with a hefty price tag of $74,500. BMW and Open AI are backing robots made by Figure, a California-based company. Meanwhile, Nvidia is developing Project GR00T to also deliver humanoid robots.Earlier this year, Goldman Sachs forecast that the annual global market for humanoid robots could reach $38 billion by 2035, with robot shipments of 1.4 million units both for industrial and consumer applications. It also said that robots could become more affordable as their manufacturing cost has been decreasing more than expected -- leading to faster commercialization.

Read more