powders of specific particle size, high productivity and versatile applications. By definition, âSpray drying is the transformation of feed from a fluid state into a dried. particulate form by spraying the feed into a hot drying medium.â (Masters, 1991) A spray dryer operates on convection mode.
Sometimes the grounds and maintenance department of a town or county creates mulch from trees that have been cut down and they make it available to the public. To lay a 4-inch-deep spread of bark mulch in a 300-square-foot area, a landscape or garden service will charge $425, which includes the material and labor. You can buy the mulch for $85 and do it yourself, and pocket a 80 percent saving.
Cost to Deliver Mulch. Mulch usually ranges in price from $10-$60 per cubic yard (27 square feet), not including delivery or spreading. 1  Rough wood chips fall on the low end of that range, while high-quality woods like cedar fall on the high end. 2  Most bark mulch and wood chips fall cost $20-$30 per cubic yard.