Removal of Microcystis aeruginosa using hydrodynamic cavitation: Performance and mechanisms

被引：89

作者：

Li, Pan ^{[1
,2
,3
]}

Song, Yuan ^{[4
]}

Yu, Shuili ^{[1
,2
,3
]}

机构：

[1] Tongji Univ, State Key Lab Control & Resource Reuse, Sch Environm Sci & Engn, Shanghai, Peoples R China

[2] Collaborat Innovat Ctr Adv Technol & Equipment Wa, Shanghai, Peoples R China

[3] Collaborat Innovat Ctr Reg Environm Qual, Shanghai, Peoples R China

[4] Tongji Univ, Sch Environm Sci & Engn, Shanghai, Peoples R China

来源：

WATER RESEARCH | 2014年 / 62卷

基金：

中国国家自然科学基金;

关键词：

Algal removal; Microcystis aeruginosa; Hydrodynamic cavitation; Photosynthetic apparatus; Intracellular gas vesicle; Free radical; WASTE-WATER TREATMENT; ULTRASONIC IRRADIATION; GROWTH-INHIBITION; BLOOM CONTROL; ALGAE; CYANOBACTERIA; DISINFECTION; LAKE; COAGULATION; RADIATION;

D O I：

10.1016/j.watres.2014.05.052

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Algal blooms are a seasonal problem in eutrophic water bodies, and novel approaches to algal removal are required. The effect of hydrodynamic cavitation (HC) on the removal of Microcystis aeruginosa was investigated using a laboratory scale device. Samples treated by HC were subsequently grown under illuminated culture conditions. The results demonstrated that a short treatment with HC could effectively settle naturally growing M. aeruginosa without breaking cells. Algal cell density and chlorophyll-a of a sample treated for 10 min were significantly decreased by 88% andv 94%, respectively, after 3 days culture. Various HC operating parameters were investigated, showing that inhibition of M. aeruginosa growth mainly depended on treatment time and pump pressure. Electron microscopy confirmed that sedimentation of algae was attributable to the disruption of intracellular gas vesicles. Damage to the photosynthetic apparatus also contributed to the inhibition of algal growth. Free radicals produced by the cavitation process could be as an indirect indicator of the intensity of HC treatment, although they inflicted minimal damage on the algae. In conclusion, we suggest that HC represents a potentially highly effective and sustainable approach to the removal of algae from water systems. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：241 / 248

页数：8

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