HERC upgrade will cut smog-causing pollutant


A $1.5-million upgrade planned for Hennepin County’s downtown Minneapolis incinerator aims to reduce its emissions of nitrogen oxide, a smog-causing gas.

The technology has been tested in other waste-to-energy facilities and is expected to cut nitrogen oxide emissions at the Hennepin Energy Recovery Facility, or HERC, by up to 25 percent. It involves injecting a mixture of water and urea — a compound found naturally in urine but also produced artificially — into the boilers, where it captures some of the ingredients that create nitrous oxide.


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