The number one thing that consumers can remember when it comes to recycling is that thin, pliable plastic should be excluded from standard blue recycling bins. Photos by welcomia/Canva.

As waste-to-energy gains a foothold in the energy transition, trash's more palatable cousin, recycling, sits just close enough for deeper inspection. Plastic, by and large, one of the most loved and loathed petroleum by-products, is often singled out as the most nefarious contributor to our declining climate.

With significant efforts underway to reduce the volume of single-use plastic while reusing or repurposing stronger plastics, let us turn attention to the third action in the timeless mantra–recycling.

Over the last few decades, we have embraced recycling globally, assured in our noble commitment to derive further utility out of items that no longer serve an immediate purpose from our unique perspective.

However, the act of recycling still closely resembles taking out the trash. We place items deemed worthy of secondary use into large, usually plastic, bins for carting far away from the rest of the things that still provide utility to our personal household or place of business.

For the most part, simply believing that there could or should be further utility of an item is criterion enough to warrant placement in the exalted blue bin. The small hit of dopamine elicited from the satisfaction that we are “doing our part” is just strong enough to reinforce the idea that we have also “done enough.”

But according to Vu Nguyen, director of corporate development and innovation, Waste Management, one of Houston’s leading trash, recycling, and environmental services companies, there remains one elusive challenge: the plastic bag.

The plastic bag proves problematic for a multitude of reasons, not least because of its role in ruining literally every.other.recyling.effort.ever. On the whole, we have been blissfully ignorant of the recycling process, and even more so of how much our good intentions to reuse and recycle are thwarting the same process for so many other reusable materials.

“The number one thing that consumers can remember when it comes to recycling is that thin, pliable plastic [like] bags and wrappers should be firmly excluded from standard blue recycling bins,” Nguyen shared at a Houston Tech Rodeo event earlier this spring.

After collection, simple but effective mechanisms sort items delivered to a recycling facility. Individuals pick through discarded materials placed on conveyor belts before the remaining items work their way through heavy magnets that extract useful metals while bursts of air pressure push lightweight items like paper away from heavier items like glass.

Plastic bags, including the lovely little blue ones so many of us like to purchase to fill our quaint non-standard recycling bins, tangle up in these conveyor belts, causing shutdowns to unravel them from materials otherwise well-suited for these sorting efforts. Downtime on the sorting line can get expensive, so much so that many recycling facilities often turn away entire trucks filled with potentially reusable items if even a single plastic bag is discovered inside.

Consider this the start of a public service announcement campaign to raise awareness of that simple fact.

Yasser Brenes, area president – south for Republic Services, echoes this sentiment as he shares a few tips and reminders with EnergyCapitalHTX.

  • Know What to Throw: Educate yourself on what can and cannot go inside your recycling bin. Focus on only recycling rigid plastic containers such as bottles, jugs and tubs, metal food and beverage containers, glass bottles and jars, paper and cardboard. Don’t be a wish-cycler, never throw items in your recycling bin if you are unsure if they can be recycled or not.
  • Empty, Clean, Dry: Recyclables should be rinsed free of residual food and liquid. If recyclables are not empty, clean and dry the residual food or liquid could contaminate other more fragile recyclables, like paper and cardboard, and require them to be thrown away.
  • Don’t Bag It: Recyclables should always be placed loose inside your recycling bin. Flexible plastics, such as grocery bags, wrap and tangle around the sorting equipment and should never be placed in your recycling bin.

That’s not to say that plastic bags and wrappers cannot be recycled at all; on the contrary, they absolutely can. The mechanisms for sorting them from other materials like paper, aluminum, glass, and heavy plastics just aren’t quite mature enough… yet.

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Lindsey Ferrell is a contributing writer to EnergyCapitalHTX and founder of Guerrella & Co.

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Houston researchers propose model to scale e-waste recycling

critical research

The “missing link” in critical minerals may have been in our junk drawers all along, according to new research from the University of Houston.

Jian Shi, an associate professor in the UH Cullen College of Engineering, and his team have unveiled a new supply chain model that aims to make e-waste economically viable and could help make large-scale recycling possible.

Shi, along with professor Kailai Wang and graduate researcher Chuyue Wang, published the work in a recent issue of Nature. Their study outlines how gold, lithium and cobalt from discarded electronics can be kept circulating in the U.S. through the process of “urban mining.” It was supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) through the Vehicle Technologies Office.

The team’s research found that e-waste is the fastest-growing solid waste stream in the world. When waste from smartphones or tablets is left unmanaged, the devices can leak hazardous waste and pose significant fire risks due to aging batteries. Additionally, when they are shipped off to foreign landfills, the U.S. loses the potential to recycle or reuse the critical minerals left inside.

“A lot of people have iPads or old iPhones sitting in their drawers right now, and that’s a waste of a critical resource,” Shi said in a news release. “Urban mining allows us to extract the same high-value materials found in traditional mines without the environmental destruction. More importantly, it helps secure our domestic supply chain for the technologies of tomorrow.”

According to UH, recycling e-waste has not succeeded in the U.S. due to a fragmented recycling system, in which manufacturers, collectors and recyclers operate separately, driving up costs.

The UH team's research looks to change that.

In the study, the researchers modeled streamlined recycling efforts by mapping the interactions between manufacturers and independent recycling markets. Their dual-channel closed-loop supply chain (CLSC) model identified how these players can transition from competitors to partners, which can distribute profits more equitably and make recycling efforts more financially attractive.

According to UH, the research has particular significance due to the growing demand for electronic vehicles and their batteries.

“We can improve the performance of the entire recycling ecosystem and make the profit distribution more balanced,” Wang said in the release. “This ensures that the materials we need for EVs and advanced electronics stay right here in the U.S.”

“By making recycling work at scale, we aren’t just cleaning up waste,” Shi added. “We’re building a foundation that benefits both our national security and our economy.”

1PointFive signs latest deal, shares update on $1.3B carbon removal project

DAC deal

Houston-based 1PointFive, a subsidiary of Occidental Petroleum Corp., has secured another buyer of carbon dioxide removal credits for its $1.3 billion STRATOS project as it moves toward operation.

Bain & Company, a Boston-based consulting firm, has agreed to purchase 9,000 metric tons of carbon dioxide removal (CDR) credits from the direct air capture (DAC) facility over three years, according to a news release. DAC technology pulls CO2 from the air at any location, not just where carbon dioxide is emitted.

The deal is Bain's first purchase of DAC removal credits. The company has developed a program that helps clients purchase carbon credits from a range of carbon-removal technologies.

"We are proud to partner with 1PointFive and add them to our portfolio of engineered carbon removal technologies," Sam Israelit, Bain’s chief sustainability officer, said in the news release. "Their track record for developing DAC technology, coupled with their deep understanding of what it takes to deliver large-scale infrastructure projects, uniquely positions them to be a leader in this emerging segment.”

“We believe this agreement demonstrates continued momentum for the solution while supporting the development of vital domestic infrastructure,” Anthony Cottone, president and general manager of 1PointFive, added in the release.

Bain joins others like Microsoft, Amazon, AT&T, Airbus, the Houston Astros and the Houston Texans that have agreed to buy CDR credits from STRATOS.

The Texas-based STRATOS project is being developed through a joint venture with investment manager BlackRock and is designed to capture up to 500,000 metric tons of CO2 per year. The U.S Environmental Protection Agency approved Class VI permits for the project last year.

1PointFive says STRATOS is "progressing through start-up activities." The company shared in a LinkedIn post that Phase 1 of the project is expected to go online in Q2, with Phase 2 ramping up through the remainder of 2026.

Houston researcher develops efficient method to cool AI data centers

cool findings

A University of Houston professor has developed a new cooling method that can remove heat at least three times more effectively from AI data centers than current technologies.

Hadi Ghasemi, a distinguished professor of Mechanical & Aerospace Engineering at UH, published his findings in two articles in the International Journal of Heat and Mass Transfer. The findings solve a critical issue in the growing AI sector, according to UH.

High-powered AI data centers generate huge amounts of heat due to the GPU and operating systems they use with extreme power densities, which introduce complex thermal challenges. Traditionally, cooling methods, like microchannels, which use flow and spray cooling, have had limitations when exposed to extreme heat flux, according to UH.

Ghasemi’s research, however, found a more effective way to design thin-film evaporation structures to release heat from data centers and electronics at record performance.

Ghasem’s solution coupled topology optimization and AI modeling to determine the best shapes for thin film efficiency, ultimately landing on a branch-like structure—resembling a tree.

The model found that the “branches” needed to be about 50 percent solid and 50 percent empty space for optimum efficiency, and that they could sustain high heat fluxes with minimal thermal resistance.

“These structures could achieve high critical heat flux at much lower superheat compared to traditionally studied structures,” Ghasemi said in a news release. “The new structures can remove heat without having to get as hot as previous removal systems.

Ghasemi’s doctoral candidates, Amirmohammad Jahanbakhsh and Saber Badkoobeh Hezave, also worked on the project. The team believes their results show the impact of a physics-aware, AI design and can help ensure reliability, longevity and stability of AI data centers.

“Beyond achieving record performance, these new findings provide fundamental insight into the governing heat-transfer physics and establishes a rational pathway toward even higher thermal dissipation capacities,” Ghasemi added in the release