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Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter
Kanagawa Academy of Science and Technology, KSP East 407, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
Department of Applied Biological Science, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510, Japan
Department of Microbiology and Immunology, Teikyo University School of Medicine, 2-11-1 Kaga, Itabashi-ku, Tokyo 173-8605, Japan
Kitasato Research Center for Environmental Science, 1-15-1, Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0329, Japan
VIX Corporation, 2-14-8 Midorigaoka, Meguro-ku, Tokyo 152-0034, Japan
* Author to whom correspondence should be addressed.
Received: 26 April 2013; in revised form: 5 June 2013 / Accepted: 11 July 2013 / Published: 22 July 2013
Abstract: The recent applications of a TiO2-modified Ti-mesh filter (TMiP™) for water purification are summarized with newly collected data including biological assays as well as sewage water treatment. The water purification reactors consist of the combination of a TMiP, a UV lamp, an excimer VUV lamp, and an ozonation unit. The water purification abilities of the reactor were evaluated by decomposition of organic contaminants, inactivation of waterborne pathogens, and treatment efficiency for sewage water. The UV-C/TMiP/O3 reactor disinfected E. coli in aqueous suspension in approximately 1 min completely, and also decreased the number of E. coli in sewage water in 15 min dramatically. The observed rate constants of 7.5 L/min and 1.3 L/min were calculated by pseudo-first-order kinetic analysis respectively. Although organic substances in sewage water were supposed to prevent the UV-C/TMiP/O3 reactor from purifying water, the reactor reduced E. coli in sewage water continuously. On the other hand, although much higher efficiencies for decomposition of organic pollutants in water were achieved in the excimer/TMiP reactor, the disinfection activity of the reactor for waterborne pathogens was not as effective as the other reactors. The difference of efficiency between organic pollutants and waterborne pathogens in the excimer/TMiP reactor may be due to the size, the structure, and the decomposition mechanism of the organic pollutants and waterborne pathogens. These results show that a suitable system assisted by synergy of photocatalysts and other technologies such as ozonation has a huge potential as a practical wastewater purification system.
Keywords: photocatalysis; TiO2-modified Ti-mesh filter; ozonation; excimer lamp; advanced oxidation processes; sewage water treatment
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Ochiai, T.; Masuko, K.; Tago, S.; Nakano, R.; Nakata, K.; Hara, M.; Nojima, Y.; Suzuki, T.; Ikekita, M.; Morito, Y.; Fujishima, A. Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter. Water 2013, 5, 1101-1115.
Ochiai T, Masuko K, Tago S, Nakano R, Nakata K, Hara M, Nojima Y, Suzuki T, Ikekita M, Morito Y, Fujishima A. Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter. Water. 2013; 5(3):1101-1115.
Ochiai, Tsuyoshi; Masuko, Ken; Tago, Shoko; Nakano, Ryuichi; Nakata, Kazuya; Hara, Masayuki; Nojima, Yasuhiro; Suzuki, Tomonori; Ikekita, Masahiko; Morito, Yuko; Fujishima, Akira. 2013. "Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter." Water 5, no. 3: 1101-1115.