Study On Treatment Of Refractory Wastewater By Chlorine Dioxide Catalytic Oxidation

As a kind of water treatment medicament , chlorine dioxide(C10₂) is wildly used in water treatment field because of its excellent functions. Utilizing its strong oxidizability to treat refractory wastewater is one of the primary uses of C10₂ in water treatment.The preparation of catalyst of C10₂ catalytic oxidation , C10₂ chemical oxidation system and C10₂ catalytic oxidation system were studied in this paper. The results showed that 4% dip-liquid , 300℃³50℃ and 2 hours of calcination were the best preparation conditions for catalysts. pH=6⁸, lOOOmg C10₂/L wastewater, reacting 6Omin were the most efficient and economical, when treating Acid Brilliant Scarlet GR dyestuff wastewater, the COD of which was 3500mg/L, by C10₂ chemical oxidation. The COD removal ratio exceeded 50%. When treating the wastewater by catalytic oxidation which was composed of C10₂ and special catalyst , pH=2, 800mg C10₂/L wastewater, reacting 45⁶0min were the most efficient and economical. The COD removal ratio exceeded 80%, and the oxidation index was 3. 49 (COD removal amount/ C10₂ used amount). The cost of oxidant removing 1kg COD was ï¿¥3.72.Catalyst life, catalyst recovery and mechanism of C10₂ catalytic oxidation were elementarily developed . The study illuminated that C10₂ catalytic oxidation was an efficient method to treat refractory wastewater and it had a broad prospect.