Abstract
A new porous ceramic carrier based on casting sand, sawdust and zeolite was used to immobilize microorganisms for continuous wastewater treatment in a packed-bed bioreactor. Scanning electron microscopy showed that the ceramic carrier has a high porosity with diameters of around 5~300µm. Immobilization capacity of the carrier was 62 mg/ g dry carrier, in terms of mixed liquor volatile suspended solids. When synthetic wastewater (chemical oxygen demand 250 mg/l) as a model feed solution and 30 mg kaolin/l as a suspended solid (SS) were used, the removal efficiency as measured by the total organic carbon and SS were 91% and 71%, respectively, at a hydraulic retention time of 3 h.
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