Using sensitive instruments, facility staff monitor the temperature and moisture content of the material to encourage naturally occurring microorganisms and bacteria to do their work.
The optimal temperature for microbial activity is 130 to 140 degrees Fahrenheit, according to Colleen Vanderlinden, About.com's Guide to Organic Gardening. At this temperature, microbes are breaking down organic matter and reproducing at high rates. Additionally, the high temperature will kill most weed seeds and harmful bacteria in the pile.
