Curbside composting collection, which initially got off to a rocky re-start after a pandemic hiatus, will expand to every borough by the end of next year, having diverted more than 2.7 million pounds of organic waste from Queens alone during a pilot program last fall. The city is also proposing a rule that would require residents to separate their yard waste from recycling so it can be composted instead.
Some of that organic waste might get processed into gas for use as an energy source. Some will end up in Fresh Kills, Staten Island, where the city’s Department of Sanitation (DSNY) has a 33-acre facility devoted to composting food scraps dropped off by residents and collected from school cafeterias, as well as debris collected by landscaping companies.
City Limits took a tour of the site earlier this year, in which Ian Twine, DSNY’s deputy director of composting, explained the months-long process that breaks down organics into nutrient-rich material. That final product, which resembles a deep brown soil, then gets packed into bags and dubbed “Big Apple Compost,” which the city sells or hands out at community events.
Food waste dropped off at the site gets put into a machine called the Tiger, which separates the heavier organic components from lighter contaminants like plastic bags. It’s then mixed with water and the machine grinds the scraps down until they take on “an oatmeal kind of consistency.”
“It then goes into a dump truck that has wood chips in it to absorb any excess liquid so it doesn’t leak anywhere,” Twine explained. “Then once that truck is full, it’s brought over to a specific windrow drop there and then is processed with a machine we call the Scarab, which is literally a broad machine with a rolling pin on the bottom that chops up the material.”
In addition to food scraps, the Staten Island facility also composts yard waste collected by city agencies like the Parks Department and from landscaping companies. The facility is also permitted to process up to 70,000 cubic yards of “woody debris.”
“Which is really targeted for the times when we become a site for any large scale wood event, like a hurricane, that creates a lot of wood waste,” Twine said. “During Sandy we became a city dumping zone for chipping and removal of all those trees.”
Both food and yard waste is eventually moved into long horizontal rows called windrows, which speeds up the composting process, where it sits for a month before being moved into “curing piles” to sit for another month. As worms, bacteria and fungi break down the organic waste, the material turns darker in color.
The piles heat up to around 130 degrees Fahrenheit inside due to the natural composting process. “It’s warmer than the surrounding air so you get this really wonderful steam pile—it’s really dramatic when it’s really cold outside,” Twine said.
From there, a machine stuffs the compost into 40 pound bags with the Big Apple Compost label, which boasts that the product is “Made From 100% NYC Organics.”
“One pallet is 60 bags, of 40-pound bags. We can do a pallet in four minutes,” said Twine. “It’s a fun machine to watch.”