Removal of blue-green algae using the hybrid method of hydrodynamic cavitation and ozonation

Zhilin Wu, Haifeng Shen, Bernd Ondruschka, Yongchun Zhang, Weimin Wang, David H. Bremner

Research output: Contribution to journalArticle

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Abstract

A suspension of Microcystis aeruginosa (30 μg L−1chlorophyll a) was circulated in a hydrodynamic cavitation device and ozone was introduced at the suction side of the pump. The removal of algae over 10 min using hydrodynamic cavitation alone and ozone alone is less than 15% and 35%, respectively. The destruction of algae rises significantly from 24% in the absence of the orifice to 91% with the optimized orifice on 5 min of processing using hydrodynamic cavitation along with ozone (HC/O3) and the utilization of ozone increases from 32% to 61%. Interestingly, the suction process is more effective than the extrusion method (positive pressure) and the optimal bulk temperature for algal elimination was found to be 20 °C. Increasing the input concentration of ozone is favorable for the removal of algae but leads to a greater loss of ozone and a decrease in the utilization of ozone. Under the optimal conditions, the algal cells and chlorophyll a are completely destroyed in 10 min by use of the hybrid method.
Original languageEnglish
Pages (from-to)152-158
Number of pages7
JournalJournal of Hazardous Materials
Volume235-236
DOIs
Publication statusPublished - 15 Oct 2012

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cavitation
cyanobacterium
hydrodynamics
ozone
alga
suction
ozonation
method
removal
extrusion
pump
chlorophyll a

Cite this

Wu, Zhilin ; Shen, Haifeng ; Ondruschka, Bernd ; Zhang, Yongchun ; Wang, Weimin ; Bremner, David H. / Removal of blue-green algae using the hybrid method of hydrodynamic cavitation and ozonation. In: Journal of Hazardous Materials. 2012 ; Vol. 235-236. pp. 152-158.
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abstract = "A suspension of Microcystis aeruginosa (30 μg L−1chlorophyll a) was circulated in a hydrodynamic cavitation device and ozone was introduced at the suction side of the pump. The removal of algae over 10 min using hydrodynamic cavitation alone and ozone alone is less than 15{\%} and 35{\%}, respectively. The destruction of algae rises significantly from 24{\%} in the absence of the orifice to 91{\%} with the optimized orifice on 5 min of processing using hydrodynamic cavitation along with ozone (HC/O3) and the utilization of ozone increases from 32{\%} to 61{\%}. Interestingly, the suction process is more effective than the extrusion method (positive pressure) and the optimal bulk temperature for algal elimination was found to be 20 °C. Increasing the input concentration of ozone is favorable for the removal of algae but leads to a greater loss of ozone and a decrease in the utilization of ozone. Under the optimal conditions, the algal cells and chlorophyll a are completely destroyed in 10 min by use of the hybrid method.",
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Removal of blue-green algae using the hybrid method of hydrodynamic cavitation and ozonation. / Wu, Zhilin; Shen, Haifeng; Ondruschka, Bernd; Zhang, Yongchun; Wang, Weimin; Bremner, David H.

In: Journal of Hazardous Materials, Vol. 235-236, 15.10.2012, p. 152-158.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Removal of blue-green algae using the hybrid method of hydrodynamic cavitation and ozonation

AU - Wu, Zhilin

AU - Shen, Haifeng

AU - Ondruschka, Bernd

AU - Zhang, Yongchun

AU - Wang, Weimin

AU - Bremner, David H.

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AB - A suspension of Microcystis aeruginosa (30 μg L−1chlorophyll a) was circulated in a hydrodynamic cavitation device and ozone was introduced at the suction side of the pump. The removal of algae over 10 min using hydrodynamic cavitation alone and ozone alone is less than 15% and 35%, respectively. The destruction of algae rises significantly from 24% in the absence of the orifice to 91% with the optimized orifice on 5 min of processing using hydrodynamic cavitation along with ozone (HC/O3) and the utilization of ozone increases from 32% to 61%. Interestingly, the suction process is more effective than the extrusion method (positive pressure) and the optimal bulk temperature for algal elimination was found to be 20 °C. Increasing the input concentration of ozone is favorable for the removal of algae but leads to a greater loss of ozone and a decrease in the utilization of ozone. Under the optimal conditions, the algal cells and chlorophyll a are completely destroyed in 10 min by use of the hybrid method.

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SN - 1873-3336

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