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Cities Turn Sewage Into 'Black Gold' For Local Farms
Originally published on Fri April 12, 2013 12:07 pm
On a normal day, Kansas City, Mo., processes more than 70 million gallons of raw sewage. This sewage used to be a nuisance, but Kansas City, and a lot of municipalities around the country, are now turning it into a resource for city farmers hard up for fertilizer.
After the sewage has been processed at a treatment plant, it's piped out to Birmingham Farm on the north side of the Missouri River.
Tim Walters is the chief agronomist for Kansas City who runs Birmingham. He's got the 1,350-acre farm plumbed with pipes to disperse the smelly stuff.
The city runs much of the heavier goop through a process called anaerobic digestion, which heats the sewage to kill pathogens. When the processed sludge, or "biosolids," arrives at the farm, thick jets of it arc out 30 to 40 feet from giant moving spreaders. (Check out a video from Harvest Public Media.)
"It's black, black gold," says Walters. "Looks like grease. Doesn't smell like grease ... and when you get it on you it's hard to get off."
The sludge is packed with nutrients good for the corn and soybeans grown here that generate almost half a million dollars in profits for the city each year. Walters figures the free fertilizer is worth about $175,000 a year, in last year's prices. But it's in short supply.
"Every year we typically run out, they can't digest enough, they can't get enough down to us," says Walters.
The city's two digesters run all the time, but they still can't keep up with Birmingham's demand, let alone the city's supply of waste. Still, more than half the biosolids are put to use, which makes Kansas City just about average for the U.S., according to Ned Beecher, who directs the North East Biosolids and Residuals Association.
Beecher says cities from Boston to Chicago to Los Angeles now sell or use most of their human waste. Much of it ends up as fertilizer for hay, corn, soybean, wheat or grape crops.
But even with all the well-established, beneficial and even lucrative ways to dispose of solid waste, a lot of it still ends up in landfills or being processed at big, industrial incinerators.
Shaun O'Kelley runs an incineration facility in Kansas City that burns human waste down to a fine ash, using lots of natural gas, electricity and manpower to do it. The incinerator no longer runs all the time, but O'Kelley is about to fire it up again because for now, burning some human waste is cheaper than recycling it.
"Land application has its challenges," says O'Kelley. You need land, patience to deal with regulations and capital, he says.
And, there's the smell; residents aren't always pleased to have an expanding biosolids-application program in their backyard.
So, the drive to make good use of human waste has been largely stalled for years, and despite a steady stream of innovations, almost half of it is still wasted.
AUDIE CORNISH, HOST:
While most Americans contribute to agriculture by buying food at stores and restaurants, about half of us make an additional donation in the form of fertilizer. With spring at hand, farmers are getting ready for planting. That means enriching the soil.
And as Frank Morris, of member station KCUR reports, it may just involve you.
FRANK MORRIS, BYLINE: Here in this bathroom, in busy gas station in Kansas City North, you're reminded that while this place is a major distribution point for fuel, food and drinks, it's also a big collection point for something else.
(SOUNDBITE OF FLUSHING TOILET)
STEVE ZUHLKE: I'd say we're probably running about 70 million gallons a day right now.
MORRIS: In Kansas City, almost all toilets lead here, to a treatment plant where engineer Steve Zuhkle is monitoring the flow.
ZUHLKE: It's got a little, earthy smell to it.
MORRIS: The city runs much of the heavier goop through a process called anaerobic digestion, and then pipes it out to its own farm.
TIM WALTERS: We are down next to the Missouri River. We have 1,350 acres of really good bottom land soil.
MORRIS: Tim Walters is the chief agronomist for Kansas City, the municipal farmer, so to speak. He's got this spread plumbed with what could be mistaken for sewer mains, except these pipes don't collect smelly stuff. They disperse it.
Thick jets of processed sewage arc out 40 or 50 feet from giant, moving sprayers.
WALTERS: It's black. It's black gold. It looks like grease. It doesn't smell like grease but it looks like grease. And when you get it on you, it's hard to get off.
MORRIS: It's also packed with nutrients good for the corn and soybeans that Walters grows here, generating almost half a million dollars in profits for the city each year. Walters figures the free fertilizer is worth nearly $200,000 year. And he'd use more of it, if he could get it.
WALTERS: Every year we typically run out. They can't digest enough. They can't get enough down to us.
MORRIS: The city's two digesters run all the time but can't keep up with Walters' demand, let alone the city's supply. Still, more than half the processed sludge, or biosolids, is put to use, which makes Kansas City just about average for the U.S., according to Ned Beecher.
NED BEECHER: It's actually been a pretty routine practice in a lot of places. In the U.S., about 55 percent of the sewage sludge that's produced at wastewater treatment plants is recycled as biosolids.
MORRIS: Beecher heads the North East Biosolids and Residuals Association. He says cities across the country - from Boston to Chicago to L.A. - sell or use most, if not all, their human waste to fertilize plants.
BEECHER: Hay and corn, but it's also used on soybeans, on wheat, on hops for beer, on grapes.
MORRIS: But Milwaukee wins the award.
JAMIE STAUFENBEIL: Milorganite has been doing this for over 86 years.
MORRIS: Jamie Staufenbeil markets Milorganite, a lawn and garden fertilizer made from sewage collected in Milwaukee. She says the city refines this stuff so much that it's safe for any kind of use.
STAUFENBEIL: We just reached nine billion pounds of Milorgonite sold into the marketplace.
MORRIS: With profits lowering sewer fees for Milwaukee residents. Hundreds of waste water treatment plants collect methane and burn it for energy. But even with all the well-established, beneficial, and even lucrative ways to dispose of solid waste, a lot of it still ends up in landfills or being processed at big, industrial incinerators, like this one in Kansas City.
(SOUNDBITE OF MACHINERY)
UNIDENTIFIED MAN: Watch out. Watch out.
SHAUN O'KELLEY: It's basically a Roman arch structure, eight floors.
MORRIS: Shaun O'Kelley runs this incineration facility, burning human waste down to a fine ash and using lots of natural gas, electricity and manpower to do it. The incinerator no longer runs all the time, but O'Kelley is about to fire it up again, because for now, here, burning some human waste is cheaper than recycling all of it.
O'KELLEY: Land application has its challenges, too. The USDA, the EPA, you know, with the regulations. Plus, you have to have the land available and the capital to invest in that property. Always economics - it's always money.
MORRIS: Biogas and biosolids are also hard on machinery. And, well, there's the smell. Residents aren't always pleased about having an expanding biosolids application program in their backyard. So the drive make good use of human waste has been largely stalled for years. And despite a steady stream of innovations, almost half of it is still wasted.
For NPR News, I'm Frank Morris in Kansas City. Transcript provided by NPR, Copyright NPR.