OP-II-3

PP-III-47PERFORMANCE OF PHOTOCATALYST FOR PURIFICATIONOF RE-FLOW FURNACE EXHAUST GASRyoko Nakano 1 , Eiko Obuchi 2 , Katsumi Kato 2 , Katsuyuki Nakano 11 Department of Energy and Environment Systems Faculty of Engineering,Fukuoka University, Fukuoka University 8-19-1 Nanakuma, Jonan-ku,Fukuoka 814-0180, Japan, td095503@cis.fukuoka-u.ac.jp2 Department of Chemical Engineering, Fukuoka University8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanINTRODUCTIONThe RoHS (Restriction of Hazardous Substances) has been enforced in EU sinceJuly 1, 2006. Due to this enforcement, 6 substances including lead are subjected tothis regulation. It is more common to use lead-free solder rather than using soldercontaining lead these days. The melting point of lead-free solder is 220° which ishigher than lead-containing solder (mp: 183°). Thus the re-flow furnace needs to becontrolled at high temperature (around 240°) when using lead-free solder. However,there might be a possibility of generation of hazardous substances such as organicnitrogen compounds from the furnace when it is controlled at such high temperature.To solve these problems, Yasukawa Ltd. has developed “Scavenger” as a novelexhaust gas treatment device for re-flow furnace. It takes in the exhaust gas from reflowfurnace and the (harmful) organic compounds in the exhaust gas are absorbedin the nano-bubble water.The purpose of our research is to purify the waste water by using TiO 2photocatalytic ceramic filter. At the initial stage of this research, we have investigatedthe characteristic degradability of organic compounds in the wastewater by usingtitania photocatalyst supported on silica beads.EXPERIMANTALFigure 1 shows a diagram of thelaboratory scale experimentalapparatus. TiO 2 /SiO 2 photocatalystReactor100ml/minFlaskStirrerExperimental conditionsLight source:Black Light(6W×4, 3.52mW/cm 2 )Germicidal Light(6W×4, 5.38mW/cm 2 )Reactor size : H270×i.d.10mmbeads were filled in the tubelar reactorPumpand the waste water (C 0 :20ppm) wasFig. 1 Diagram of the experimental apparatus.circulated at a flow rate of 100ml/min. After adsorption has equilibrated, 6W×4 blacklights (BL) or 6W×4 germicidal lights (GL) were irradiated on the surface ofcatalyst[1]. Analysis of organic compounds in wastewater was conducted using TOC524