Oxidation of Excess Organic Sludge from a Moving-bed Biofilm Process
Biological oxidation of organic sludge yielded by a moving-bed biofilm process utilizing PVA-gel beads as the biocarrier was investigated. In contrast to previous studies with industrial wastewaters free of suspended solids (SS), in this pilot test treatment of a municipal wastewater was considered where the influent SS could have a significant impact on sludge decay. Under steady-state conditions without wasting any sludge from the system, excess sludge was maintained in an aerobic oxidation process at a level of 8 g/L with a hydraulic retention time of 8 h. A mass-balance across the system indicated biomass yield and decay rates suitable for effective elimination of organic sludge. Though further observation is warranted to evaluate performance over long-term operation, results here suggest that excess organic sludge of a municipal wastewater treatment plant can be greatly reduced in quantity by using a PVA-gel biofilm process coupled with endogenous decay of excess biomass.
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Document Type: Research Article
Publication date: 2007-09-01
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