Active carbon biodisk,a new biodisk,was manufactured by fixing granular active carbon on the disk with fixative.Stimulated chemical wastewater was treated by a single stage biodisk process.The treatment effects by active carbon diodisk,quartzite biodisk and polypropylene biodisk were compared.The experimental results indicate that active carbon biodisk has better COD removal than the other two.Under the conditions of influent COD 600mg/L,HRT 6h and rotary speed 4r/min,the COD removal rate by active carbon biodisk is 71.3%.In addition,active carbon biodisk also has a good shock load toleranc.In the process of wastewater treatment,active carbon hs adsorptive action only during the first 7d of biofilm-forming,the main effect is biodegradation after biofilm has been formed.