TY - JOUR
T1 - The effect of hydrodynamic cavitation on Microcystis aeruginosa
T2 - Physical and chemical factors
AU - Li, Pan
AU - Song, Yuan
AU - Yu, Shuili
AU - Park, Hee Deung
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China ( 51208366 ), the Science and Technology Commission of Shanghai Municipality, China ( 12ZR1451000 ) and the Foundation of the State Key Laboratory of Pollution Control and Resource Reuse, China ( PCRRY12001 ) and the 111 Project, China.
Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015
Y1 - 2015
N2 - The various effects of hydrodynamic cavitation (HC) on algal growth inhibition were investigated. The gas-vacuolate species Microcystis aeruginosa responded differently to the gas-vacuole-negative alga Chlorella sp. When M. aeruginosa was subjected to HC, both its cell density and photosynthetic activity were subsequently reduced by nearly 90% after three days culture. However, the cell density of Chlorella sp. was reduced by only 63%, and its final photosynthetic activity was unaffected. Electron microscopy confirmed that HC had a minimal impact on algal cells that lack gas vacuoles. Shear stress during recirculation only modestly inhibited the growth of M. aeruginosa. The relative malondialdehyde (MDA) content, a quantitative indicator of lipid peroxidation, increased significantly during HC treatment, indicating the production of free radicals. Accordingly, the addition of H2O2 to the HC process promoted the production of free radicals, which also improved algal reduction. A comparison of the outcomes and energy efficiency of HC and ultrasonic cavitation indicated that HC gives the best performance: Under 10min cavitation treatment, the algal removal rate of HC could reach 88% while that of sonication was only 39%.
AB - The various effects of hydrodynamic cavitation (HC) on algal growth inhibition were investigated. The gas-vacuolate species Microcystis aeruginosa responded differently to the gas-vacuole-negative alga Chlorella sp. When M. aeruginosa was subjected to HC, both its cell density and photosynthetic activity were subsequently reduced by nearly 90% after three days culture. However, the cell density of Chlorella sp. was reduced by only 63%, and its final photosynthetic activity was unaffected. Electron microscopy confirmed that HC had a minimal impact on algal cells that lack gas vacuoles. Shear stress during recirculation only modestly inhibited the growth of M. aeruginosa. The relative malondialdehyde (MDA) content, a quantitative indicator of lipid peroxidation, increased significantly during HC treatment, indicating the production of free radicals. Accordingly, the addition of H2O2 to the HC process promoted the production of free radicals, which also improved algal reduction. A comparison of the outcomes and energy efficiency of HC and ultrasonic cavitation indicated that HC gives the best performance: Under 10min cavitation treatment, the algal removal rate of HC could reach 88% while that of sonication was only 39%.
KW - Algae
KW - Free radical
KW - Gas vacuole
KW - Hydrodynamic cavitation
KW - Lipid peroxidation
UR - http://www.scopus.com/inward/record.url?scp=84983119926&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2015.05.017
DO - 10.1016/j.chemosphere.2015.05.017
M3 - Article
C2 - 26026840
AN - SCOPUS:84983119926
SN - 0045-6535
VL - 136
SP - 245
EP - 251
JO - Chemosphere
JF - Chemosphere
ER -
