A new community housing development in the Bronx will feature a cool piece of kit: an on-site aerobic digester that can turn 1,100 pounds of food scraps into 220 pounds of high-quality fertilizer every single day.

Built by Harp Renewables, it's basically a big stomach filled with bacteria that breaks down food scraps and wasted food into their component parts, and in the future could be a standard part of all apartment units as the amount of food waste in American reaches 30% of the total mass of all trash collection.

The Peninsula, organized by Gilbane Development Company, will feature 740 units of affordable housing, 50,000 square-foot light industrial space and equal sized green space, and 15,000 feet of commercial space, all of which will send their castaway comestibles right into the digester.

Fast Company reports that Christina Grace, founder of a zero-waste food management company, helped plan the design and implementation of the digester into The Peninsula, and helped organize a 40% grant from the city to pay the $50,000 upfront cost.

"The goal is for this material to work its way into the community garden network in the Bronx," Grace told the magazine, adding that she expects it to pay for itself over just a few years. "We see this as highly replicable in both commercial and residential venues. We know there's a need for fertilizer."

Producing fertilizer right there in the city reduces the need for it to be trucked in from afar, chipping away, even if just a bit, at NYC traffic.

Perhaps uniquely beneficial to New York City compared to other spots in the U.S. is that the digester will have a significant impact on the Bronx's share of the city's rodent problem.

Those who've watched the Morgan Spurlock documentary Rats will understand why that's significant—while those that haven't will have to imagine what living in a megacity where rats outnumber people by around 8 or 10 to 1 looks like.

Another big problem the bio-digesters could potentially help is pollution and greenhouse gas emissions. Fertilizer is a big emitter of all three of the most-targeted GHGs. Fertilizer, like quarry dust and ammonia is, like so many commodities, often imported from countries who specialize in its production, such as Norway, but also Russia and Ukraine, whose conflict has recently highlighted the fragility of the supply chain with sharp increases in prices.

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This importation means thousands of tons of CO2 gets emitted during transportation, while producing ammonia is also one of the larger CO2 emitting processes due to the use of fossil fuels to create it. Also produced in huge amounts from natural fertilizer production and landfill decomposition is methane.

Bio-digesters by design keep the CO2 and methane in the fertilizer produced, rather than it entering the atmosphere.

For these reasons and more, the aerobic bio-digester is slowly making its way into residential and industrial spaces around the country.

WS reported on an enormous bio-digester at the heart of the D.C. advanced resource (sewage) recovery center outside the capital, and on the use of bio-digesters on Australian pig farms which are helping reduce the environmental and psychological impact of the effluent produced from such operations.

Harp Renewables tweeted how happy they were to have installed their bio-digester in the town of Cashel, Ireland.

Another successful installation was completed by @Nuplanetss at Cashel Palace Hotel.

The Harp CX2 Biodigester can digest up to 2000L of waste per week. Our industry-leading technology reduces the waste volume and weight by up to 85% in less than 24h. pic.twitter.com/lZwSYB9h8i

— Harp Renewables (@Harp_Renewables) August 20, 2021

Another successful installation was completed by @Nuplanetss at Cashel Palace Hotel.The Harp CX2 Biodigester can digest up to 2000L of waste per week. Our industry-leading technology reduces the waste volume and weight by up to 85% in less than 24h. pic.twitter.com/lZwSYB9h8i

Expect to see more stories like this pop up around the globe.

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