Houston researchers harness dialysis for new wastewater treatment process

waste not

Rice University's Menachem Elimelech and Yuanmiaoliang “Selina” Chen published a study in Nature Water on mimicking dialysis from the medical field to treat wastewater. Photo by Gustavo Raskosky/Rice University

By employing medical field technology dialysis, researchers at Rice University and the Guangdong University of Technology in China uncovered a new way to treat high-salinity organic wastewater.

In the medical field, dialysis uses a machine called a dialyzer to filter waste and excess fluid from the blood. In a study published in Nature Water, Rice’s team found that mimicking dialysis can separate salts from organic substances with minimal dilution of the wastewater, addressing some of the limitations of previous methods.

The researchers say this has the potential to lower costs, recover valuable resources across a range of industrial sectors and reduce environmental impacts.

“Traditional methods often demand a lot of energy and require repeated dilutions,” Yuanmiaoliang “Selina” Chen, a co-first author and postdoctoral associate in Elimelech’s lab at Rice, said in a news release. “Dialysis eliminates many of these pain points, reducing water consumption and operational overheads.”

Various industries generate high-salinity organic wastewater, including petrochemical, pharmaceutical and textile manufacturing. The wastewater’s high salt and organic content can present challenges for existing treatment processes. Biological and advanced oxidation treatments become less effective with higher salinity levels. Thermal methods are considered “energy intensive” and susceptible to corrosion.

Ultimately, the researchers found that dialysis effectively removed salt from water without requiring large amounts of fresh water. This process allows salts to move into the dialysate stream while keeping most organic compounds in the original solution. Because dialysis relies on diffusion instead of pressure, salts and organics cross the membrane at different speeds, making the separation method more efficient.

“Dialysis was astonishingly effective in separating the salts from the organics in our trials,” Menachem Elimelech, a corresponding author on the study and professor of civil and environmental engineering and chemical and biomolecular engineering at Rice, said in a news release. “It’s an exciting discovery with the potential to redefine how we handle some of our most intractable wastewater challenges.”

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Onshore upstream meets greener pastures in the city where the earth meets the sky at URTeC 2023 in Denver. Photo via Shuttersock.

Can't miss: Unconventional Resources Technology Conference

ROAD TRIP

June 13-15 | Unconvetional Resources Technology Conference (URTeC)

Take a trip to higher ground and cooler temperatures next week at URTeC 2023 in Denver, Colorado. This technically focused event, hosted annually by the Society of Petroleum Engineers, American Association of Petroleum Geologists, and Society of Exploration Geophysicists, features the best and brightest minds in onshore oil and gas sharing novel applications of science and technology in pursuit of a more sustainable upstream energy base.

The event kicks off with almost two hours of discussion amongst industry leaders like Clay Gaspar, executive vice president and COO of Devon Energy, Amy Henry, CEO of Eunike Ventures, Robert E. Fast, CTO of Hess Corporation, and Neil McMahon, managing partner of Kimmeridge. The plenary panel will address the role of unconventionals in a lower carbon energy world, from tackling emissions to making advances in CCUS.

Chevron puts safety in the spotlight with a two-part session devoted to cleaner, more efficient engineering methodologies deployed to support corporate objectives while safely delivering higher returns and lower carbon. Hear from Vice President of the Rockies business unit, Kim McHugh, Johannes Alvarez, EOR and CO2 advisor for the Mid-Continent business unit, Vanessa Ryan, methane reduction manager of strategy and sustainability, and more leaders across Chevron building a new future for upstream energy.

Before the event wraps, be sure to catch an engaging discussion late Thursday morning with Christine Ehlig-Economides, professor and Hugh Roy & Lillie Cranz Cullen Distinguished University Chair at the University of Houston, on decarbonizing tight oil and shale gas, re-use opportunities for wastewater, and repurposed operations through closed-loop geothermal.

Registration currently remains open, with one- and three-day event options, as well as an exhibit hall-only option. The event usually draws over 3,000 attendees, so don’t wait to sign up.

For a complete list of upcoming energy events, visit the Events tab right here on EnergyCapitalHTX.com.

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Houston geothermal company closes $13M in investments to fuel growth

fresh funding

XGS Energy, a California-headquartered geothermal power company with a major presence in Houston, has closed $13 million in new financing that included new investors Aligned Climate Capital, ClearSky, ClimateIC and WovenEarth Ventures, in addition to inside investors.

The company plans to “aggressively expand” its team in Houston this year, according to a news release.

“We are facing global energy supply challenges of unprecedented scale and urgency,” Kevin Kimsa, Managing Partner at ClimateIC, said in the release. “The XGS team is uniquely primed to meet the moment, bringing together innovative technology and leading engineering talent with the deep experience in infrastructure development and financing critical to deploying large-scale energy systems at speed.”

As part of the financing deal, Mano Nazar, ClearSky Senior Advisor and the former Chief Nuclear Officer of NextEra Energy, will join the XGS Energy Board of Directors.

“XGS’s advanced geothermal technology is uniquely positioned to deliver abundant energy to the grid faster than any other baseload energy technology at a time of unprecedented demand for energy resources,” Nazar said in a news release. “We are excited to partner with XGS to deliver on their mission of sustainable, reliable, and scalable geothermal energy.”

XGS is known for its next-gen closed-loop geothermal well architecture. The company saw massive growth in the Houston market last year and recently completed a 100-meter field demonstration in central Texas. The new funding supports the XGS’s multi-gigawatt project pipeline.

The recent financing also builds on an oversubscribed Series A round led by Constellation Technology Ventures, VoLo Earth Ventures, and Valo Ventures that closed last year.

Here are 10+ must-attend Houston energy transition events for Q2 2025

On the Agenda

Editor's note: Spring is here, and this quarter is packed with must-attend events for those in the energy transition sector. Houston plays host to myriad summits, conferences, and expos that you won't want to miss. Mark your calendars and begin registering today. Please note: this article may be updated to include additional events.

March 31-April 2 — World Hydrogen North America 2025

Seize the opportunity to connect with industry leaders from across the hydrogen value chain, fostering long-term business partnerships and exploring potential collaborations. Engage with prominent off-takers, both nationally and internationally, and gain first-hand insights into the latest projects shaping the future of hydrogen in the USA and Canada.

This event begins March 31 at the Marriott Marquis. Click here to register.

April 1-2 — 8th Annual LNG Summit USA

The LNG Summit USA brings together leaders in the LNG sector, who in turn bring solutions to glaring industry challenges. The event addresses key challenges and opportunities within the LNG industry and the broader energy landscape. The conference will also provide insights into alternative energy options that could potentially replace or complement LNG.

This event begins April 1. Click here to register.

April 17 — 2025 UH Energy Symposium Series on Plastics Circularity

Celebrating its 12th year, the UH Energy Symposium Series tackles critical issues impacting the energy sector. This year’s focus on plastics circularity will bring together industry leaders, researchers, and visionaries to explore the intersection of plastics, sustainability, and energy.

This event begins at 8 am on April 17 at UH Student Center South. Click here to register.

April 28-30 — PPDM Energy Data Convention Houston 2025

This flagship conference is dedicated to exploring the latest advancements and trends in energy data, offering opportunities for networking, knowledge exchange, and collaboration. Gain insights into cutting-edge data management practices and how they can enhance operational efficiency, support strategic decision-making, and contribute to achieving long-term objectives. Highlights include keynote presentations from renowned experts, interactive panel discussions, hands-on workshops, and an exhibitor showcase.

This event begins April 28 at Norris Conference Center. Click here to register.

May 12-15 — Enverus Evolve Conference

Staying ahead of the curve in the energy sector is critical. This conference is designed to equip energy leaders with foresight in the energy market, providing cutting-edge technological know-how, sessions and networking opportunities industry leaders, and offering practical guidance on how to apply technology to solve big problems.

This event begins May 12 at Hilton Americas Houston. Click here to register.

May 27-28 — 6th American LNG Forum

Join LNG industry professionals, innovators, and policymakers to discover groundbreaking technologies that are driving the future of liquified natural gas. Topics will include market dynamics and decarbonization strategies, offering attendees the chance to connect, learn, and become part of the LNG revolution.

This event begins May 27 at the Westin Galleria Houston. Click here to register.

May 28-30 — CHARGE North America

This intimate, immersive experience is tailored to forward-thinking energy professionals. The conference includes hands-on interactive workshops led by top strategists; real-world case studies; and insights from leading speakers on resilient branding, consumer expectations, and climate action. Attendees will engage in panel discussions on sustainability and energy diversification and enjoy exclusive networking opportunities with global executives and innovators.

This event begins May 28 at The Ion. Click here to register.

May 29-30 — 5th Annual American Hydrogen Forum

Connect with hydrogen industry leaders, innovators, and policymakers at the American Hydrogen Forum. Discover groundbreaking technologies and strategies focusing on hydrogen fuel cell technology, hydrogen energy, and low-carbon hydrogen solutions.

This event begins May 29 at the Westin Galleria Houston. Click here to register.

June 4-5 — 2025 AWS Energy Symposium

The fourth annual AWS Energy Symposium is the premier AWS event for the energy industry. Hear from leading energy and utility customers, partners, and startups about how they're using AWS to scale innovation and transform their organizations. The event is invitation only and is geared toward senior leaders and director-level executives from across the energy value chain. Click here to submit a registration request.

June 11-12 — Energy Projects Conference & Expo

The Energy Projects Conference & Expo (EPC Show) is the largest event in North America for professionals working at the heart of major energy projects. The show will bring together five leading conferences under one roof for the first time, uniting 3,000-plus engineering, construction, commissioning, supply chain, operations, and maintenance professionals. Conference subjects span LNG exporting, hydrogen and ammonia, midstream, petrochem and refining, and sustainable aviation fuels.

This event begins June 11 at the George R Brown Convention Center. Click here to register.

June 25-26 — Carbon Capture Technology Expo

Tackling climate change is one of the biggest global challenges that requires immediate action, and many industrial sectors are now looking to new technology to help meet net-zero emission targets. The Carbon Capture Technology Expo is North America's leading event for carbon capture, utilization, and storage. The expo offers opportunities to network with industry frontrunners and best-in-class solution providers.

This event begins June 25 at NRG Center. Click here to register. It is co-located with the Hydrogen Technology Conference & Expo North America. Expo passes are free.

8 Houston energy companies land on Time's top greentech list for 2025

top honor

The accolades keep rolling in for Houston-based Fervo Energy, a producer of geothermal power.

Fervo lands at No. 6 on Time magazine and Statista’s new list of America’s Top GreenTech Companies of 2025. The ranking recognizes sustainability-focused companies based on factors such as impact, financial strength, and innovation.

Time notes that Fervo broke ground in 2023 in Utah on what the company claims will be the world’s largest geothermal plant. The plant is scheduled to start supplying carbon-free electricity to the grid next year and to reach its 400-megawatt capacity in three years.

“Technologies like this only make a difference if we deploy them at large-scale in a way that can reduce carbon emissions and increase the reliability of the grid,” Fervo CEO Tim Latimer told Time in 2023.

The startup was named North American Company of the Year by research and consulting firm Cleantech Group for 2025. Fervo topped the Global Cleantech 100, Cleantech Group’s annual list of the world’s most innovative and promising cleantech companies.

Last year, Fervo also made Time’s list of the 200 Best Inventions of 2024. Fervo was recognized in the green energy category for its FervoFlex geothermal power system.

Founded in 2017, Fervo is now a unicorn, meaning its valuation as a private company exceeds $1 billion. The startup’s valuation is estimated at $1.4 billion. According to PitchBook data, the company raised $634 million in the fourth quarter of 2024.

In all, eight Houston-area companies appear among the top 250 greentech companies ranked by Time and Statista. Other than Fervo, they are:

No. 43 Lancium Technologies, an energy storage and distribution company
No. 50 Solugen, a producer of sustainable chemicals.
No. 56 Quaise Energy, which specializes in terawatt-scale geothermal power.
No. 129 Plus Power, a developer, owner and operator of battery storage projects.
No. 218 Dream Harvest, which promotes sustainable vertical farming.
No. 225 Cemvita, which uses synthetic biology to convert carbon emissions into bio-based chemicals.
No. 226 Syzygy Plasmonics, which decarbonizes chemical production.

Vermont-based BETA Technologies claimed the No. 1 spot. The company manufactures electric aircraft.

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