The flash-dryer incinerator process was first introduced in the 1930s as a low-capital-cost, space-saving alternative to air drying sludge on sand beds. This method of drying is advantageous because the resulting heat-dried sludge is virtually free of pathogens and weed seeds and the process is flexible enough to produce only the amount of dried sludge that could be marketed. The disadvantages of this process are dust and odor. These problems, while manageable through the use of dust collectors and afterburners, make the flash-dryer less popular than multiple-hearth and flu-idized-bed incinerators.
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