The Dune Express

The longest conveyer belt in the U.S. is moving sand in Texas

The Dune Express in West Texas. Courtesy of Atlas Energy

It's longer than the width of Rhode Island, snakes across the oil fields of the southwest U.S. and crawls at 10 mph – too slow for a truck and too long for a train.

It's a new sight: the longest conveyer belt in America.

Atlas Energy Solutions, a Texas-based oil field company, has installed a 42-mile long conveyer belt to transport millions of tons of sand for hydraulic fracturing. The belt the company named “The Dune Express” runs from tiny Kermit, Texas, and across state borders into Lea County, New Mexico. Tall and lanky with lids that resemble solar modules, the steel structure could almost be mistaken for a roller coaster.

In remote West Texas, there are few people to marvel at the unusual machine in Kermit, a city with a population of less than 6,000, where the sand is typically hauled by tractor-trailers. During fracking, liquid is pumped into the ground at a high pressure to create holes, or fractures, that release oil. The sand helps keep the holes open as water, oil and gas flow through it.

But moving the sand by truck is usually a long and potentially dangerous process, according to CEO John Turner. He said massive trucks moving sand and other industrial goods are a common site in the oil-rich Permian Basin and pose a danger to other drivers.

“Pretty early on, the delivery of sand via truck was not only inefficient, it was dangerous,” he said.

The conveyor belt, with a freight capacity of 13 tons, was designed to bypass and trudge alongside traffic.

Innovation isn't new to the oil and gas industry, nor is the idea to use a conveyor belt to move materials around. Another conveyer belt believed to be the world’s longest conveyor — at 61 miles long — carries phosphorous from a mine in Western Sahara on the northwest coast of Africa, according to NASA Earth Observatory.

When moving sand by truck became a nuisance, an unprecedented and risky investment opportunity arose: constructing a $400 million machine to streamline the production of hydraulic fracturing. The company went public in March 2023, in part, to help pay for the conveyor belt and completed its first delivery in January, Turner said.

The sand sits in a tray-shaped pan with a lid that can be taken off at any point, but most of it gets offloaded into silos near the Texas and New Mexico border. Along its miles-long journey, the sand is sold and sent to fracking companies who move it by truck for the remainder of the trip.

Keeping the rollers on the belt aligned and making sure it runs smoothly are the biggest maintenance obstacles, according to Turner. The rollers are equipped with chips that signal when it's about to fail and need to be replaced. This helps prevent wear and tear and keep the machine running consistently, Turner said.

The belt cuts through a large oil patch where environmentalists have long raised concerns about the industry disturbing local habitats, including those of the sagebrush lizard, which was listed as an endangered species last year by the U.S. Fish and Wildlife Service.

“In addition to that, we know that the sand will expedite further drilling nearby,” said Luke Metzger, executive director of Environment Texas. “We could see more drilling than we otherwise would, which means more air pollution, more spills than we otherwise would.”

The Dune Express currently runs for about 12 to 14 hours a day at roughly half capacity but the company expects to it to be rolling along at all hours later this year.

In New Mexico, Lea County Commissioner Brad Weber said he hopes the belt alleviates traffic on a parallel highway where car crashes are frequent.

“I believe it’s going to make a very positive impact here,” he said.

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A View From HETI

A team from UH has published two breakthrough studies that could help cut costs and boost efficiency in carbon capture. Photo courtesy UH.

A team of researchers at the University of Houston has made two breakthroughs in addressing climate change and potentially reducing the cost of capturing harmful emissions from power plants.

Led by Professor Mim Rahimi at UH’s Cullen College of Engineering, the team released two significant publications that made significant strides relating to carbon capture processes. The first, published in Nature Communications, introduced a membraneless electrochemical process that cuts energy requirements and costs for amine-based carbon dioxide capture during the acid gas sweetening process. Another, featured on the cover of ES&T Engineering, demonstrated a vanadium redox flow system capable of both capturing carbon and storing renewable energy.

“These publications reflect our group’s commitment to fundamental electrochemical innovation and real-world applicability,” Rahimi said in a news release. “From membraneless systems to scalable flow systems, we’re charting pathways to decarbonize hard-to-abate sectors and support the transition to a low-carbon economy.”

According to the researchers, the “A Membraneless Electrochemically Mediated Amine Regeneration for Carbon Capture” research paper marked the beginning of the team’s first focus. The research examined the replacement of costly ion-exchange membranes with gas diffusion electrodes. They found that the membranes were the most expensive part of the system, and they were also a major cause of performance issues and high maintenance costs.

The researchers achieved more than 90 percent CO2 removal (nearly 50 percent more than traditional approaches) by engineering the gas diffusion electrodes. According to PhD student and co-author of the paper Ahmad Hassan, the capture costs approximately $70 per metric ton of CO2, which is competitive with other innovative scrubbing techniques.

“By removing the membrane and the associated hardware, we’ve streamlined the EMAR workflow and dramatically cut energy use,” Hassan said in the news release. “This opens the door to retrofitting existing industrial exhaust systems with a compact, low-cost carbon capture module.”

The second breakthrough, published by PhD student Mohsen Afshari, displayed a reversible flow battery architecture that absorbs CO2 during charging and releases it upon discharge. The results suggested that the technology could potentially provide carbon removal and grid balancing when used with intermittent renewables, such as solar or wind power.

“Integrating carbon capture directly into a redox flow battery lets us tackle two challenges in one device,” Afshari said in the release. “Our front-cover feature highlights its potential to smooth out renewable generation while sequestering CO2.”

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