Newspaper article St Louis Post-Dispatch (MO)

Chemical to Help Mask Mulch Odor

Newspaper article St Louis Post-Dispatch (MO)

Chemical to Help Mask Mulch Odor

Article excerpt

Ladue has turned to a chemical to mask odor from its mulch site.

A consultant has recommended a product called Enviro-Chem Cx.

The product contains copper sulfate, said Dat Ngo, an environmental engineer for Monsanto. The chemical can be an irritant in high concentrations, but the product used on the compost contains minute amounts of the chemical, Ngo said. Ngo has suggested using 200 pounds of the product for one million pounds of compost.

Ngo recommended that the city line the bottom of a compost storage pile with a solid version of the product and then spray compost with more of it. Workers already have tested the chemical on city mulch.

"This treatment should go a long way toward controlling the odor," Ngo told Ladue's council Monday.

For about a month, Ngo has investigated odor at the city's mulch site south of U.S. Highway 40 (Interstate 64) and east of Warson Road. Neighbors have complained that the site smells.

Ngo found a strong manure odor when workers turned the compost pile. …

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