Garbage left outside leaves you saying, “ew, what is that smell?” This is especially true when it’s a hot, humid day because food rots faster when it’s warm. Household waste is mostly food. When the trash is full inside, it gets tossed into an outside bin, causing foul odors. Acetic acid is to blame.
A new solar-powered garbage lid insert combats this smelly issue. It fits onto standard wheeled trash bins and breaks down the chemicals causing the smell.
No More Smelly Garbage
Activated charcoal filters are a common solution for garbage odors, but they tend to struggle in warmer weather. Ironically, researchers use the sun as a solution.
“Our motivation was therefore very practical,” said Jinlong Wang, a corresponding author of the study. “We wanted to address the odor at its source, inside the bin itself, instead of letting it escape into the street.”
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The team made a special catalyst using an inexpensive chemical called manganese oxide. To make it more efficient, they bonded lithium to it as an electronic booster. When sunlight hits this mix, it absorbs organic acids and physically breaks the chemical bonds of the acetic acid. Lab tests showed this lithium-boosted version works better than standard manganese oxide or activated carbon.
Taking Out the Trash
Outside of the lab, the team built a clear, gas-permeable insert with a lens that focuses natural sunlight directly onto the catalyst layer. They designed this removable module to snap right onto a regular trash bin lid.
Then they tested it with real old fruit, bread, and wine to see how the lid would handle the smell of garbage. The insert successfully decomposed acetic acid for more than 40 days under natural sunlight. It also proved stable and worked well in humid conditions where normal filters fail.
“Conventional catalytic odor abatement relies on electrical heating to activate the catalyst, but we use light instead,” Wang concluded.
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