THE USE OF THREE STAGE DIGESTION TO MITIGATE THE ADVERSE IMPACTS OF THERMOPHILIC DIGESTION
In an effort to reduce sludge production, the Inland Empire Utilities Agency (IEUA) set goals to improve sludge dewaterability, improve volatile solids reductions, and produce Class A biosolids exclusively through digestion while maintaining odors to a minimum. Several phased digestion approaches were evaluated to meet these initial goals. Through full-scale operation, IEUA determined that a three stage mesophilic acid/thermophilic gas/mesophilic gas digestion system was able to meet the Agency's original criteria. The use of the three stage system consistently produced sludge with less than 1,000 MPN fecal colifom per gram of dry sludge, two percentage points dryer sludge cake, increased overall facility gas production, and a reduced biosolid hauling quantity while maintaining odors at a minimum.
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Document Type: Research Article
Publication date: 01 January 2001
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