Mysterious Poop Foam Causes Explosions on Hog Farms

A sample of the manure foam that caused an explosion that lifted a hog barn two feet off the ground and blew a man 20 feet away from where he had been standing (see video below). Screenshot from the video embedded below.

Fight disinformation: Sign up for the free Mother Jones Daily newsletter and follow the news that matters.

When you hear about foam in the context of food, you might think of the culinary innovations of the Spanish chef Ferran Adrià, who’s famous for dishes like apple caviar with banana foam.

But this post is about a much less appetizing kind of foam. You see, starting in about 2009, in the pits that capture manure under factory-scale hog farms, a gray, bubbly substance began appearing at the surface of the fecal soup. The problem is menacing: As manure breaks down, it emits toxic gases like hydrogen sulfide and flammable ones like methane, and trapping these noxious fumes under a layer of foam can lead to sudden, disastrous releases and even explosions. According to a 2012 report from the University of Minnesota, by September 2011, the foam had “caused about a half-dozen explosions in the upper Midwest…one explosion destroyed a barn on a farm in northern Iowa, killing 1,500 pigs and severely burning the worker involved.”

And the foam grows to a thickness of up to four feet—check out these images, from a University of Minnesota document published by the Iowa Pork Producers, showing a vile-looking substance seeping up from between the slats that form the floor of a hog barn. Those slats are designed to allow hog waste to drop down into the below-ground pits; it is alarming to see it bubbling back up in the form of a substance the consistency of beaten egg whites.

And here’s the catch: Scientists can’t explain the phenomenon.

Check out this amazing 2011 video presentation on the matter by University of Minnesota researcher David Schmidt. He opens by describing a 2009 explosion that lifted a hog barn a “couple of feet off the ground” and blew the farm operator himself 20 feet from the building. (Thankfully, he wasn’t injured, and there were no animals in it.) And check out the footage, starting about 3:19 in, of the foam itself, which must be seen to be believed. At one point , a shovel dips into the mire and scoops up as sample—which jiggles and pulsates, alive, apparently, with microbial activity. Schmidt also does a great job of explaining just how manure foam can cause explosions.

David Schmidt: Foaming Manure Pits from Iowa State University Extension on Vimeo

I wrote about the phenomenon about a year ago. But these days, there’s not much in the agriculture trade press about it. Which led me to wonder: Has the mysterious foam subsided—or congealed into yet another fact of factory farming that isn’t even notable anymore, like, you know, raising hundreds of pigs over pits that concentrate their waste, or dosing them them daily with low levels of antibiotics, leading to rampant antibiotic-resistant bacteria?

I decided to do a bit of digging for an update. Via email, Angela Kent, an associate professor in the department of natural resources and environmental sciences at the University of Illinois, informed me that “manure foaming” is “still a very serious problem among pork producers in the Midwest.” Scientists have still not been able to finger the cause of it, but “we are in the midst of a large multi-institution investigation focused on finding the cause of this very serious problem.”

So: still happening, and still no explanation.

Surveys show that around 25 percent of operations in the hog-intensive regions of Minnesota, Illinois, and Iowa are experiencing foam—and “the number may be higher, because some operators might not know that they have it.”

I then got Larry Jacobson, a professor and extension engineer at the University of Minnesota who has been working on the issue, on the phone. He confirmed that the problem persists—just about a month ago, he said, workers were welding metal fixtures in an empty hog facility and a fire broke out, likely because a spark managed to penetrate foam enough to free trapped methane and ignite it. (No one was injured.)

Jacobson said that surveys show that around 25 percent of operations in the hog-intensive regions of Minnesota, Illinois, and Iowa are experiencing foam—and “the number may be higher, because some operators might not know that they have it.”

He added that the practice of feeding hogs distillers grains, the mush leftover from the corn ethanol process, might be one of the triggers. Distillers grains entered hog rations in a major way around the same time that the foam started emerging, and manure from hogs fed distillers grains contains heightened levels of undigested fiber and volatile fatty acids—both of which are emerging as preconditions of foam formation, he said. But he added that distillers grains aren’t likely the sole cause, because on some operations, the foam will emerge in some buildings but not others, even when all the hogs are getting the same feed mix.

But if the causes of manure foam remain a mystery, a solution seems to be emerging, Jacobson told me: Dump a bit of monensin, an antibiotic widely used to make cows grow faster, directly into the foam-ridden pit. At rather low levels—Jacobson told me that about 25 pounds of the stuff will treat a typical 500,000 gallon pit—the stuff effectively breaks up the foam, likely by altering the mix of microbes present. No other treatment has been shown to work consistently, he said.

Thankfully, monensin isn’t used in human medicine. Still, it’s striking to consider that the meat industry’s ravenous appetite for antibiotics has now extended to having to treat hog shit with them.

WE'LL BE BLUNT

It is astonishingly hard keeping a newsroom afloat these days, and we need to raise $253,000 in online donations quickly, by October 7.

The short of it: Last year, we had to cut $1 million from our budget so we could have any chance of breaking even by the time our fiscal year ended in June. And despite a huge rally from so many of you leading up to the deadline, we still came up a bit short on the whole. We can’t let that happen again. We have no wiggle room to begin with, and now we have a hole to dig out of.

Readers also told us to just give it to you straight when we need to ask for your support, and seeing how matter-of-factly explaining our inner workings, our challenges and finances, can bring more of you in has been a real silver lining. So our online membership lead, Brian, lays it all out for you in his personal, insider account (that literally puts his skin in the game!) of how urgent things are right now.

The upshot: Being able to rally $253,000 in donations over these next few weeks is vitally important simply because it is the number that keeps us right on track, helping make sure we don't end up with a bigger gap than can be filled again, helping us avoid any significant (and knowable) cash-flow crunches for now. We used to be more nonchalant about coming up short this time of year, thinking we can make it by the time June rolls around. Not anymore.

Because the in-depth journalism on underreported beats and unique perspectives on the daily news you turn to Mother Jones for is only possible because readers fund us. Corporations and powerful people with deep pockets will never sustain the type of journalism we exist to do. The only investors who won’t let independent, investigative journalism down are the people who actually care about its future—you.

And we need readers to show up for us big time—again.

Getting just 10 percent of the people who care enough about our work to be reading this blurb to part with a few bucks would be utterly transformative for us, and that's very much what we need to keep charging hard in this financially uncertain, high-stakes year.

If you can right now, please support the journalism you get from Mother Jones with a donation at whatever amount works for you. And please do it now, before you move on to whatever you're about to do next and think maybe you'll get to it later, because every gift matters and we really need to see a strong response if we're going to raise the $253,000 we need in less than three weeks.

payment methods

WE'LL BE BLUNT

It is astonishingly hard keeping a newsroom afloat these days, and we need to raise $253,000 in online donations quickly, by October 7.

The short of it: Last year, we had to cut $1 million from our budget so we could have any chance of breaking even by the time our fiscal year ended in June. And despite a huge rally from so many of you leading up to the deadline, we still came up a bit short on the whole. We can’t let that happen again. We have no wiggle room to begin with, and now we have a hole to dig out of.

Readers also told us to just give it to you straight when we need to ask for your support, and seeing how matter-of-factly explaining our inner workings, our challenges and finances, can bring more of you in has been a real silver lining. So our online membership lead, Brian, lays it all out for you in his personal, insider account (that literally puts his skin in the game!) of how urgent things are right now.

The upshot: Being able to rally $253,000 in donations over these next few weeks is vitally important simply because it is the number that keeps us right on track, helping make sure we don't end up with a bigger gap than can be filled again, helping us avoid any significant (and knowable) cash-flow crunches for now. We used to be more nonchalant about coming up short this time of year, thinking we can make it by the time June rolls around. Not anymore.

Because the in-depth journalism on underreported beats and unique perspectives on the daily news you turn to Mother Jones for is only possible because readers fund us. Corporations and powerful people with deep pockets will never sustain the type of journalism we exist to do. The only investors who won’t let independent, investigative journalism down are the people who actually care about its future—you.

And we need readers to show up for us big time—again.

Getting just 10 percent of the people who care enough about our work to be reading this blurb to part with a few bucks would be utterly transformative for us, and that's very much what we need to keep charging hard in this financially uncertain, high-stakes year.

If you can right now, please support the journalism you get from Mother Jones with a donation at whatever amount works for you. And please do it now, before you move on to whatever you're about to do next and think maybe you'll get to it later, because every gift matters and we really need to see a strong response if we're going to raise the $253,000 we need in less than three weeks.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate