摘要：Slag ceramics, which were made from steel slag as well as a small percentage of clay and poreforming materials, were applied to a biological contact oxidation reactor for the treatment of micro-aerobic effluent. The experiment results showed that slag ceramics exhibited some favourablecharacteristics for removing pollution, such as lighter mass, larger specific surface area and easierbiofilm-attachment compared with steel slag. In addition, a contact oxidation process filled with slagceramics was multifunctional in pollutant removal, namely, COD, nitrogen and phosphorus weresimultaneously removed. Under the hydraulic retention time (HRT) of 2.5 h, the removal efficiencies ofNH 3 -N, TN, COD and TP were 99%, 84%, 63% and 82%, respectively, and the effluent concentrationsranged in 12~27 mg/L, 0.1~1.0 mg/L, 0~0.6 mg/L and 1.0~6.8 mg/L, respectively. Mineralogical andchemical investigations revealed that the mechanisms for P removal by slag-ceramics filler, were thecombination of adsorption and Ca phosphate precipitation. Therefore, the mechanisms of pollutantremoval through the contact oxidation reactor filled with slag ceramics were complicated, includingadsorption, precipitation, bio-oxidation and bio-reduction, etc. Meanwhile, phosphate saturation shouldbe considered for the long-term operation.
