The Missouri Department of Natural Resources describes a Yard Waste/ Composting Facility business as:

A facility in the business of collecting, storing or processing organic materials, yard waste, food scraps, various compostable solid waste items, bulking agents or additives for composting.

You may need some or all of the following permits for a Yard Waste/ Composting Facility business:

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Air Major Construction Permit Sections (7), (8) & (9)

If your business plans to construct a new installation or modify an existing minor installation and the project has the potential to emit more than major emission levels of a regulated air containment or construct a new installation or modify an existing major installation and the project has the potential to emit more than the minor levels per year, you may require an Air Major Construction Permit Sections (7), (8) & (9) to address potential air emissions.
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Air Minor Construction Permit Section (5)

If your business plans to construct a new installation or modify an existing minor installation and the project has the potential to emit less than major source levels per year; or you plan to construct a new installation or modify an existing major installation and the project has the potential to emit less than the minor levels per year, you may require an Air Minor Construction Permit to address potential air emissions.
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Feedstock Compost Sites Permit MOG920000

If your business is designed and operated as a no-discharge, mixed feedstock composting facility under 20 acres, you must obtain a Feedstock Compost Sites MOG920000 master general permit.
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Open Burning Notification

Open burning is the burning of any materials in which air contaminants are emitted directly into the air without first passing through a stack or chimney. The Missouri Department of Natural Resources does not issue permits for open burning. Prior to conducting any open burning, businesses and citizens should contact the city or county of jurisdiction for any local restrictions.

The department's Facts on Open Burning Under Missouri Regulations - PUB2047 fact sheet summarizes allowable and prohibited open burning under Missouri regulations. It does not include open burning restrictions that city or county governments may impose in addition to Missouri’s state regulations.