Abstract
Expanded-bed granular activated carbon (GAC) anaerobic reactor was applied to treat artificial wastewater which contains high concentration of chloroacetaldehyde as well as sodium acetate. Organic loadings were changed from 1.0 to 6.1g-CODcr·kg-1-GAC·d-1 by changing concentrations of organics (from 90 to 900 mg·l-1 for chloroacetaldehyde, and from 1,000 to 2,000 mg·l-1 for sodium acetate). Hydraulic retention time was changed from 2.2 to 1.1 days based on expanded-bed volume. The operation of the reactor was successfully started without any dilution of the wastewater and the reactor could respond without any deterioration of treatment efficiency to shock load by the adsorption ability of GAC used as attached medium. COD and chloroacetaldehyde removal efficiencies were kept more than 87% and 97% respectively. Biomass in the reactor was 114μgDNA·g-1-GAC, which corresponds to 2,000 mgVSS·l-1 based on the expanded-bed volume.
