Coffee grounds could eliminate bad sewer odors – Gaggia News - Elizabeth Smythe – 2/14/2012 - Eggy-drain smells could soon be a thing of the past, all due to left-over coffee grounds. Coffee grounds have many uses: mulch for the garden and as an effective cellulite body scrub to name but two. Now researchers have discovered a third use for the often-wasted by-product of the coffee machine: to disguise smelly sewer odors.
Tests were made by scientists at the City College of New York (CCNY) in an attempt to find an environmentally-friendly way to eliminate toxic gases from the air. Currently, a form of carbonized-charcoal is being used in filters.
During the experiments, researchers found that nitrogen which is contained in coffee grounds can help boost the power of the carbon’s ‘smell-fighting’ properties, according to World Coffee News. Effectively, it ‘sops up’ the offensive hydrogen sulfide gas, which can linger around drains, via a process called “adsorption”.
Teresa Bandosz, CCNY’s professor of chemistry and chemical engineering, believes that this “natural biomass”, so abundant in sulphur-neutralizing elements, should not be ignored. This is particularly important, she is cited on ccny.cuny.edu, as making carbon absorbents more effective would usually necessitate the additional expense of treating with nitrogen-rich substances.
Professor Bandosz is hopeful that, with its “affinity for toxic gas”, coffee grounds will soon be commercially developed into next generation green waste filters.

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