By Rachel Cohen
Idaho dairy farms were awarded $5 million from a state fund to help improve water quality and reduce greenhouse gas emissions.
The money in the CAFO Improvement Fund, set up by the legislature last year, will go toward 13 projects on 12 dairies. CAFOs, or concentrated animal feeding operations, are big livestock or poultry farms.
Their manure, often held in large pits called lagoons, emits gasses like methane, as well as odor.
While manure can be used as fertilizer, putting it on fields can lead to polluting aquifers or rivers when too many of its nutrients like phosphorous and nitrogen make it to the water.
However, CAFOs are not eligible for one of the Idaho Department of Environmental Quality’s main water quality improvement grants, so agriculture industry groups lobbied the legislature for a separate program.
On Monday, Idaho Dairymen’s Association CEO Rick Naerebout told lawmakers how the awarded projects will deal with the waste’s environmental impact.
“Anything from additional containment, so more lagoon storage, or piping those lagoons to different pivots to be able to spread nutrients further away from the facility, all the way up to some of the most advanced manure technologies we have at our disposal with reverse osmosis being proposed on at least two projects," he said.
Naerebout said some of these technologies are “cutting edge” and aren’t yet in use on any Idaho farms.
A central goal of most of the projects funded is to better separate the solid and liquid parts of cow manure. Drying the solid components on their own makes it easier to spread out over more acres as fertilizer and to transport it to fields farther away. This helps ensure certain plots aren’t being overloaded with phosphorus, in turn improving water quality.
One farm, Desert Ridge Dairy in Boise, is implementing a wastewater filtration system powered by earthworms, according to project applications shared by DEQ, which is administering the grant program. The water the worms filter by eating the contaminants can then be used for irrigating crops.
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