Solar-powered trashcan lid insert gets rid of garbage stink - Energy & Green Tech - Hi Tech & Innovation

A solar-powered insert in the right bin's lid breaks down food waste smells that get stink in a garbage bin with a typical lid (left image). Credit: Adapted from Environmental Science & Technology 2026, DOI: 10.1021/acs.est.6c07573

Garbage left outside starts smelling unpleasant very quickly, especially in warm, humid climates that accelerate food decay. In ACS' Environmental Science & Technology, researchers report a solar-powered lid insert that fits onto standard wheeled trash bins and helps combat the stench. In tests with real food, the lid insert efficiently breaks down acetic acid, the main culprit released from rotting waste that's responsible for its odors, and continues working for more than a month.

Sunlight targets odors at the source

Household waste is often unwanted food that rapidly degrades in bins on neighborhood curbs, producing strong-smelling compounds such as acetic acid (vinegar), an astringent-smelling compound often associated with stinky garbage. Placing filters with activated charcoal, also called activated carbon, under the lid can help keep the stink contained, but they don't work well in hot and humid environments.

Another option is to harness sunlight that hits outdoor garbage bins to remove odor-causing chemicals. "Our motivation was therefore very practical. We wanted to address the odor at its source, inside the bin itself, instead of letting it escape into the street," says Wang, a corresponding author of the study.

An inexpensive catalyst like manganese oxide (MnO₂) could help—when activated with sunlight, it both adsorbs volatile organic acids and breaks the chemical bonds of acetic acid. So, Wang and colleagues wanted to develop a MnO₂-based catalyst and integrate it into a lid insert made from a transparent membrane that concentrates sunlight onto the catalyst. 

Researcher Jinlong Wang stands beside a garbage bin fitted with a solar-powered insert on the lid that efficiently removes food waste smells compared to a garbage bin with a typical lid. Credit: Pan Yan

A boosted catalyst passes outdoor tests

The team ionically bonded lithium to MnO₂ as a kind of electronic booster, creating a refined catalyst that is more effective at breaking down acetic acid than MnO₂ alone or activated carbon in simulated sunlight conditions in the lab. The catalyst also performed well in humid conditions.

For a real-world test, the team developed a transparent, gas-permeable insert containing a lens that concentrated light onto a layer of the catalyst. The removable module fit onto the lid of a standard wheeled trash bin. The catalyst insert continuously and efficiently broke down acetic acid generated by decaying fruit, bread and wine for more than 40 days in natural sunlight, demonstrating its long-term stability.

"Conventional catalytic odor abatement relies on electrical heating to activate the catalyst, but we use light instead," says Wang. The authors anticipate their results could someday provide a sustainable solution for odor control in waste management.

Provided by American Chemical Society 

by American Chemical Society

edited by Gaby Clark, reviewed by Robert Egan 

Source: Solar-powered trashcan lid insert gets rid of garbage stinky