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A jet loop bioreactor was used for the biological treatment of dyeing wastewater. Volumetric oxygen transfer coefficient(k_(La) of jet-loop reactor was significantly larger that of air-lift reactor. When HRT was 48 hours, almost all organics were removed by jet loop bioreactor and the removal efficiencies of BOD, COD_(Mn) and COD_(Cr) were 100, 87.2 and 83.5%, respectively. When HRT was 48 hours, the removal efficiencies of BOD, COD_(Mn), and COD_(cr) were 100, 80.1 and 79.4%. respectively. The specific removal rate was proportionally increased from 0.25 to 1.72 kg COD_(Mn)-removed/kgMLVSSㆍday as specific loading rate was increased from 0.25 to 1.60 kg COD_(Mn)/MLVSSㆍday. Therefore, jet loop bioreactor could treat effectively dyeing wastewater containing high concentration of organic compounds.
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