title: Application of immobilized TiO2 photocatalysis to improve the inactivation of Heterosigma akashiwo in ballast water by intense pulsed light.
abstract: Ballast water exotic discharge has been identified as a leading vector for marine species invasion. Here immobilized TiO2 photocatalysis is introduced to improve the performance of intense pulsed light. For intense pulsed light/TiO2 photocatalysis, a typical inactivation of 99.89±0.46% can be achieved under treatment condition of 1.78 L min(-1) flow rate, 300 V pulse peak voltage, 15 Hz pulse frequency and 5 ms pulse width. Moreover, within tested 220-260 V peak voltage, 18.37-40.51% elevation in inactivation is observed in comparison with intense pulsed light treatment alone. The rough energy consumption of the tested intense pulsed light/TiO2 treatment system is about 1.51-2.51 times higher than that of the typical commercial UV ballast water treatment system. The stability of the photocatalytic reactivity and intactness of loaded TiO2 film is proved within 20-d's test, while local erosion on stainless steel support is observed after 30-d's test. The results indicate that intense pulsed light/TiO2 photocatalysis is likely to be a competitive ballast water treatment technique, while further measures is needed to reduce the energy consumption and ensure the performance of TiO2 film in a long run.
authors.affiliation: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, PR China. Electronic address: fengdaolun@aliyun.com.
authors.forename: Daolun
authors.initials: D
authors.lastname: Feng
authors.affiliation: School of Environmental Science and Engineering, Donghua University, Shanghai 201620, PR China.
authors.forename: Shihong
authors.initials: S
authors.lastname: Xu
authors.affiliation: Maritime College, Shandong Jiaotong University, Shandong Province 264200, PR China.
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
mesh_terms: D002384:Catalysis; D008027:Light; D010777:Photochemistry / Q000379:methods*; D012767:Ships; D058009:Stramenopiles / Q000187:drug effects*; D014025:Titanium / Q000737:chemistry* / Q000494:pharmacology; D018508:Water Purification / Q000379:methods*
chemical_list: C009495:titanium dioxide; D014025:Titanium
keywords: Ballast water; Energy consumption; Heterosigma akashiwo; Intense pulsed light/TiO(2)