LIBERTY Feedstock

Collecting feedstock for LIBERTY has morphed over the years from massive cob piles to a simple EZ Bale™

When POET announced in 2007 that Project LIBERTY would use corn cobs to produce cellulosic ethanol, they knew it would be an uphill climb to collect the feedstock.

Looking at the history of comparable collection projects, POET researchers only found one. And that project – in which just 50,000 tons of biomass was collected in Iowa in the late 1990s – was discontinued after one year.
In order for Project LIBERTY to be fully operational at commercial scale, POET would need to collect 285,000 tons of corn cobs annually in the Emmetsburg, Iowa area.

“We realized we needed to collect cobs on a scale never seen before,” says Adam Wirt, POET’s Biomass Logistics Director. “With only one harvest a year, we needed to get into the fields and learn by doing.”

In 2007, POET partnered with a single farmer – Darrin Ihnen – and tested collection methods on 4,000 acres of his Hurley, South Dakota land. They retrofitted combines to collect both cobs and broken cobs and towed specially-designed cob collectors behind combines.

“We were testing equipment never seen in a field before, or since,” says Ihnen. “It felt like we were on the cutting edge of farming technology, and we were.”

2008 LIBERTY Equipment Field Days

While the processes may have been cutting edge, the results often created more questions than answers.

“It was challenging,” says Wirt. “Those first bales weren’t even bales, just loose material. Imagine a large pile of cobs at the edge of a field. Storage was a problem. Transportation was a problem.”

When it came to the production side of cellulosic ethanol, much of POET’s initial work had been based on extracting ethanol from corn cobs.

“Cobs are a great source for ethanol,” says Wirt. “But we also needed to be able to collect and transport cobs effectively. Around the same time, on the production side, we realized that we could bring in other elements of the corn plant, like some stalks and husks, and still be effective in making ethanol.”

2008 cob harvest

After similar cob collection and transportation issues in 2008, the team knew they needed a new direction.

Project LIBERTY was a year away from requiring 50,000-plus tons of biomass for its first large-scale test run. POET, in its most productive year, had only collected 15,000 tons.

“We learned a lot from those first two years, but we had to rethink our approach,” says Wirt. “When we realized we could incorporate other plant materials into the ethanol process, that gave us more options, and we started to think about baling the materials.”

While farmers regularly bale stover (the stalk, husks, cob, and leaves left in the field following harvest) for animal feed, these bales contain too little cob and too much stalk and ash for Project LIBERTY.

“In 2009, one of our team members, [POET Commodities Manager] BJ Schany, devised a bale-based method that collected a higher percentage of cob and less stalk and ash,” says Wirt.

That bale-based process, called EZ Bale™, allowed farmers to collect biomass with a traditional combine and baler and store it like hay or straw. In testing, EZ Bales contained nearly four times the amount of cobs as a traditional stover bale and required less nutrient replacement. EZ Bales proved better for farmland and also may increase future corn yields.

EZ Bales™

“If you want to talk about one major shift that moved us in the right direction, it’s the day we committed to EZ Bales,” says Wirt.

In 2010, POET collected 56,000 tons of biomass from 85 farmers who could now deliver to Project LIBERTY’s new, 22-acre stockyard. EZ Bale allowed farmers to bale biomass in round or square bales and to store the bales in various configurations. While the tonnage increased dramatically, it was the buy-in from growers that moved the collection process forward.

“That year we went through the motion of collecting, storing and delivering bales,” says Wirt. “We stumbled a bit, but we had growers right there helping us. We learned better ways to set balers. We learned how not to handle bales. We ultimately failed enough to make for a huge jump in efficiencies.”

While 2011 and 2012 saw steady increases in biomass collected (63,000 and 72,000 tons) and continued improvements in the collection process, the biggest breakthroughs came in the increased options and ease for farmers selling biomass.

“Today, selling biomass to Project LIBERTY has really become a no-brainer for area farmers,” says Schany. “They not only make extra money, but they also get rid of some of that extra residue from the field, which is a real benefit for future yields.”

When it comes to the collection and transportation of biomass, farmers can choose from either the Grower Model or the Custom Model.

In the Grower Model, farmers (or biomass collection agents) bale, stage, store and transport biomass.

“It’s just like selling grain,” says Schany. “The farmer is going to bale it, pick a delivery month, and haul it in.”

In the Custom Model, the grower harvests the grain and forms the windrow, then simply calls POETDSM who takes over from there.

“We’re doing all the work and they’re getting paid,” says Schany. “We’ve got farmers that say this is the easiest money they’ve ever made. Either way, farmers have a newfound revenue stream for something that had previously been a waste product.”

Last year’s biomass harvest produced 110,000 tons, and 2014 is expected to reap 285,000 tons.

“Tons are fun to measure,” says Wirt. “But the greatest measure of our success is the number of growers. Today, we have more than 250 farmers, compared to just one back in 2007.”

That original farmer, Darrin Ihnen, has seen firsthand how POET’s biomass collection process has improved in the last seven years and changed farming.

Darrin Ihnen

“I remember my grandfather collecting cobs so he could burn them in the cookstove,” Ihnen says. “Look what POET-DSM is doing today by collecting biomass on a scale never seen before. I wish my grandfather was alive to see how far biomass collection has come.”

For Wirt, those piles of corn cobs in the corners of farm fields seem like a world of technological advancements away. “In 2007, this was just a hope and a prayer,” he says. “Today, it’s happening. That dream has become reality.”



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