seeing green

Houston university's compost program reaches major milestone

Rice University, which works with Houston-based Moonshot Compost, reported a milestone achievement this month. Photo via Getty Images

Rice University and its campus community have officially diverted over 1 million pounds of food waste from landfills.

The university, which works with Houston-based Moonshot Compost, reported the milestone achievement this month. The program was originally launched in November 2020.

“The genesis of the current composting program was a partnership between Housing and Dining, the Office of Sustainability and an undergraduate student named Ashley Fitzpatrick,” says Richard Johnson, senior executive director for sustainability at Rice, in a news release.

“We spent quite a bit of time developing options for food waste composting at Rice with those efforts really ramping up in 2019. After a pilot project, further reflection and an interruption due to the pandemic, we found Moonshot Compost, and they proved to be the partner we needed.”

Fitzpatrick, the student who started it all went on to graduate and now works for Moonshot Compost. She did leave a legacy of student involvement in the program, and Isabelle Chang now serves as an undergraduate student intern in the Office of Sustainability. The role includes liaising with students and other major players on campus who have feedback for the program.

Rice previously had a composting program, but it never reached the same level of scale, per the news release.

“Many years ago — from the late 1990s to about 2007 — we had an on-campus composting device called the Earth Tub that provided food waste composting at one campus kitchen,” Johnson said. “However, the device failed, and frankly, the process of operating the device, getting the food waste into the device and maintaining it all proved onerous. Interest in composting remained after we decommissioned the Earth Tub, and for years we looked for alternatives [before finding Moonshot Compost].”

Launched in July 2020 by Chris Wood and Joe Villa, Moonshot operates with a team of drivers utilizing its data platform to quantify the environmental benefits of composting. The duo went on to team up with energy industry veteran Rene Ramirez to harness their compost into clean hydrogen power.

Last fall, Moonshot Hydrogen signed a memorandum of understanding with the Purdue Innovates Office of Technology Commercialization. The agreement includes facilitating the first operating commercial pilot that biologically turns food waste into hydrogen.

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A View From HETI

Simon M. King, a Rice University sophomore, served as the first author on a recent study of a new process for recycling lithium-ion batteries. Photo courtesy Rice

Rice University researchers have uncovered a more energy-efficient and faster way to recycle critical minerals from used lithium-ion batteries.

Traditional methods rely on high heat, long processing times and harsh chemicals to recover a small fraction of critical materials from batteries used in everything from smartphones to electric vehicles. However, the team from Rice's Department of Materials Science and Nanoengineering developed a process that uses a water-based solution containing amino chlorides to extract more metals in less time

The team published the findings in a recent edition of the scientific journal Small.

Simon King, a sophomore studying chemical and biomolecular engineering who completed this work as a summer research fellow at the Rice Advanced Materials Institute, served as first author of the study. He worked with corresponding authors Pulickel Ajayan, the Benjamin M. and Mary Greenwood Anderson Professor of Engineering, and Sohini Bhattacharyya, a research scientist in Ajayan’s lab.

By using a hydroxylammonium chloride (HACI) solution, the team achieved roughly 65 percent extraction of key battery metals in just one minute at room temperature, according to the study. The efficiencies grew to roughly 75 percent for several metals under longer processing times.

“We were surprised by just how fast the reaction occurs, especially without the involvement of high temperatures,” King said in a news release. “Within the first minute, we’re already seeing the majority of the metal extraction take place.”

By not requiring high temperatures or long reaction times, Rice predicts the process could have a major impact on cost and the environmental impact of lithium battery recycling. Additionally, the water-based HACI solution makes waste handling easier and lowers certain environmental risks.

In addition to extracting the materials, the team went on to demonstrate that the recovered metals could be recycled and reprocessed into new battery materials.

“A big advantage of this system is that it works under relatively mild conditions,” Ajayan added in the release. “That opens the door to more sustainable and scalable recycling technologies.”

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