| http://www.w3.org/ns/prov#value | - To determine how much of each type of nutrient is released by mechanical shearing forces alone or in combination with other treatments, a sample of the type of sludge to be processed is placed in a device such as a ball mill or colloid mill, and operated at speeds and times already known by the manufacturer to produce a substantial proportion of particles of a size about 2 microns or less in diame
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