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Degradation of Microcystins from Microcystis aeruginosa by 185-nm UV Irradiation

文献类型： 外文期刊

作者： Liu, Shuyu 1 ; Hu, Xiaohui 1 ; Jiang, Wenjun 3 ; Ma, Liyan 4 ; Cai, Min 5 ; Xu, Hong 1 ; Wu, Minghong 1 ; Ma, Fang 2 ;

作者机构： 1.Shanghai Univ, Sch Environm & Chem Engn, Shanghai 201800, Peoples R China

2.Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China

3.Florida Int Univ, Dept Chem & Biochem, Miami, FL 33199 USA

4.Chinese Acad Fishery Sci, Minist Agr, Key Lab East China Sea & Ocean Fishery Resources, Shanghai 200090, Peoples R China

5.Univ S Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA

关键词： Microcystins;Immersion;Irradiation;185 nm UV;Degradation

期刊名称：WATER AIR AND SOIL POLLUTION （ 影响因子：2.52； 五年影响因子：2.574 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Microcystins (MCs) are toxic compounds produced by cyanobacteria in eutrophicate water environment and threaten the drinking water quality which often leads to serious sicknesses. MCs are difficult to be removed in water treatment when the concentration is very lowbut still harmful. When theMC concentration is low (mu g/L), filter or some conventional chemical does not work, but UV can keep removing it to a lower level by some active groups. Herein, 185-nmUVirradiation in an immersing mode was used to remove MCs. Compared with the normal radiation mode, the immersing mode showed a remarkable degradation rate ofMCs and a greater removal efficiency than the direct radiation. Radicals of center dot H and center dot OH were produced and strengthened the removal rate, after H2O absorbed 185 nm photons. Three important factors of pH value, initial concentration, and aeration capacity were investigated. When pH was less than 7, a better removal rate by center dot H was found, due to the main path ofMC degradation and Adda strain removal. When the initial concentration increased, the MC removal ratio decreased because HO center dot formed near the lamp surface and degradedMCmolecules fast. When the aeration capacity improved, theMCremoval ratio for the presence of air enforced reaction of dissolved oxygen with hydrated electrons and hydrogen atoms produced in the radiolysis.

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