Application Of Immobilized TiO₂ Photocatalyst In Disposing Wastewater With Pulsed Discharge Technology

High voltage pulsed discharge - Photocatalysis is a kind of new Advanced Oxidation Technology in wastewater treatment, which combines High voltage pulsed discharge technology with traditional photocatalysis technology. Sol-gel method and dipping method was selected to prepare the TiO2 film on the glass beads. The best technological parameter was also determined. Using the streamer produced during high-voltage pulsed discharge to induce the photocatalysis of TiO2. More active particles were produced accordingly to degrade the Acid Orange 7 (AO7).The conclusions of the paper are summarized as follows:1. The technological parameter of prepareing TiO2 film on the glass beads was determined: the best treatment condition is 550°C calcinating temperature; the best dipping times is 10 for film layers..2. The non-electric technologcial conditions were researched and optimized:① The quantity of TiO2 added to the reactor has a best value. The best value is 130 glass beads. ②The initial liquid conductivity affects the degradation of AO7 greatly, the rising of the value reduces the degradation efficiency of AO7. ③The value of PH also affects the degradation of AO7 greatly. In the acdity condition, the degradation efficiency of AO7 is better than alkaline and neuter. ④ The rising of the initial concentration reduces the degradation efficiency of AO7. ⑤Compare the degradation efficiency of AO7 with different treatment time.The research indicates that every 15min the degradation efficiency of the treated one is better than the deposited one. After 24h deposited, the degradation efficiency of the one with 45min is equal to the one with lh treatment time.3. The electric technologcial conditions were researched and optimized: The rising of peak voltage and repeated rate increases the degradation efficiency of AO7, considering the capability of the positive pulsed voltage power supply and the spark-gap, 27Kv and 70Hz were determined as the best parameter of the research.4. In the research, the degradation efficiency of AO7 was 72.14% only by high-voltage pulsed discharge within lh. The efficiency could be improved by 16.73% with the cooperationof high-voltage pulsed discharge and TiO2 potocatalysis within the same time. The quantity of TiO2 added into the reactor was 130 glass beads.5. After treated, the degradation of AO7 solution was still decreasing by no mater the process of high-voltage pulsed discharge-TiO2 potocatalysis or the process of only high-voltage pulsed discharge. One of the possible reasons was that AO7 in the water still reacted with H2O2, which hadn't depleted during the process of discharging, yielded by high-voltage discharge. The other reason was the reaction between outcomes. These kinds of reactions kept on after discharging.