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Autothermal thermophilic aerobic digestion (ATAD) is an effective method to produce a pasteurized (Class A) biosolid. The process has not been well received in the United States because of problems with odors, poor volatile solids reduction, high dewatering costs and inflexible designs. An improved, 2nd generation ATAD design was developed to provide high total solids reduction in a small reactor for industrial biosolids. The improved design has solved the operating and aesthetic problems inherent in the first generation of ATAD. The new unit operates automatically, reduces the total solids by nearly 50%, dewaters well at a reasonable polymer dose with no metal salt addition required and produces no odors other than ammonia. The original plan for solids handling was a dryer, which was quite expensive. Use of the 2nd generation ATAD allowed the use of a much less expensive dryer, which reduced capital and operating expenses. The use of a “dual A” process also eliminated costly redundant equipment.
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Document Type: Research Article

Publication date: 2003-01-01

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