Sappi, farmers work together to save money (and the world)

Is the Cloquet Sappi mill the greenest in the world?

While there hasn’t been an official trophy awarded by pulp and paper mills worldwide, Cloquet Sappi manager Mike Schultz is quite certain we have a winner here.

It always amazes local people when they find out the Cloquet mill is considered the most environmentally friendly mill in the world.

“Right here in little old Cloquet, Minnesota,” he said with a satisfied smile.

Gone are the days when people used to talk about the “smell” of the paper mill that permeated the air in town — that ended when the new, more efficient pulp mill was constructed some 20 years ago, Schultz said, pointing out that the Cloquet pulp mill (which also now makes chemical cellulose) is still the newest pulp mill in North America.

What began years ago as an effort to prolong the life of the on-site landfill, the Cloquet mill has turned into one of the environmental success stories of the millennium. It’s been a war fought on many fronts, most of them involving reusing waste that used to end up in the landfill or the sewer, along with a shifting focus to using renewable energy as much as possible.

It all began with a wake-up call.

In 2004, at the rate the mill was putting material into its on-site landfill, officials calculated they had eight years of life left. The landfill was going to be full by 2012.

“To get a new permit for a landfill in Minnesota is an act of God,” Schultz said. “The expense of landfilling off-site would have been incredible.”

They started making a concerted effort to reduce their waste, Schultz said, and went from 126,000 cubic yards of material down to 95,000 the following year.

“We just kept going,” he said. “51 (tons), 45, 43 …”

They got as low as around 18,000 tons of waste being landfilled in the early years of this decade before the transition to chemical cellulose brought that number back up to around 30,000 in 2014. Now they’re back down to around 20,000.

“Now, after 2016, we have 25 years of life yet (in the landfill), instead of being closed six years ago,” Schultz said.

The program that has literally made the biggest difference is the mill’s “beneficial use” program, which began around 2005. Local Sappi officials work with Troy Salzer of the Carlton County Extension Agency and local farmers to take the mill’s byproducts — lime mud and boiler ash — and put these materials on the farmers’ fields to increase the soil pH to levels best suited for growing the kinds of crops they’re trying to grow.

Environmental Manager Rob Schilling compared it to watching his grandmother take the ash from her fireplace and dump it in her garden when he was a little boy.

“I always thought that was the craziest thing,” he said, “but we’re doing the exact same thing. Our boilers are like big fireplaces. We’re burning virtually all wood and the ashes at the bottom of our boiler are like the ashes at the bottom of my grandma’s fireplace. And it’s a really important nutrient for agriculture.”

Salzer acts as the go-between for the mill and the farmers and the state agencies that permit the programs. The lime mud is distributed through the Minnesota Department of Agriculture’s ag-lime program. The boiler ash program is overseen by the Minnesota Pollution Control Agency.

“I help the farmers to better understand exactly what the product is, how it is produced and how it will benefit them,” Salzer said. “Once they decide (to enroll), I test the soil and use GIS to identify the location. I determine the application rate based on the soil test.”

Salzer estimated about 100 farmers a year participate in the program, which helps make “the nutrients in the soil more available to the plants.” Most farmers generally mix the two products, because the lime gets into the soil faster, while the ash has a more sustained release over time, Salzer said, adding that the farmers are mostly growing alfalfa, grass and hay.
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