Aerobic stabilization of primary and mixed primary-chemical (alum) sludge |
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Authors: | AS Eikum DA Carlson B Paulsrud |
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Affiliation: | Norwegian Institute for Water Research, Gaustadalleen 25, P.O. Box 333 Blindern, Oslo 3, Norway |
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Abstract: | This study was conducted to investigate the feasibility of using aerobic digestion as a method for the stabilization of mixed primary-chemical (alum) sludge from a physical-chemical treatment plant. Aerobic digestion was carried out in “continuous” flow (batch fed once a day) laboratory reactors with detention times ranging from 5 to 35 days held at 7, 12, 18 and 25°C.Temperature was found to have a slightly greater influence on the reduction of volatile suspended solids in primary sludge than in mixed primary-chemical sludge. Nitrification took place in the reactors treating both primary and mixed primary-chemical sludge. The high content of aluminum in the mixed primary-chemical sludge did not inhibit the nitrifiers. The oxygen-uptake rate varied between approximately 5 mg O2 g−1 VSS h−1 and 1 mg O2 g−1 VSS h−1 depending on the detention time and the reactor temperature. Adenosine triphosphate content per unit volatile suspended solids indicated a low content of active biomass during aerobic digestion. |
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