Use of Hydrodynamic Cavitation for Algae Removal: Effect on the Inactivation of Microalgae Belonging to Genus Scenedesmus

Batista, Marylia Duarte; Anhê, Ana Carolina Borella Marfil; Gonçalves, Julio Cesar de Souza Inácio

doi:10.1007/s11270-017-3624-x

Cited by 14 publications

(6 citation statements)

References 26 publications

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“…The most direct physical method is separating out and harvesting the microalgal biomass [14]. Hydraulic management, such as building hydrodynamic cavitation structures or using ultrasound technology, has also been adopted to inhibit algae blooms by damaging specific algae cellular morphology and functions [15,16]. Other physical methods, such as increased flow velocity and turbulence, aim to remove algae by regulating the hydrodynamic conditions [17].…”

Section: Introductionmentioning

confidence: 99%

Cumulative Effects of Physical, Chemical, and Biological Measures on Algae Growth Inhibition

Li¹,

Wang²,

Zhang³

et al. 2022

Water

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Measures based on concurrent alterations of an environment’s physical, chemical, and biological factors are commonly adopted to control harmful algal blooms (HABs). It was postulated that the combinations and interactions of multiple measures could exert cumulative effects (as the overall effect may or may not be equal to the additive sum for each measure individually). However, few studies have further assessed whether the cumulative effect is synergistic, additive, or antagonistic. This study proposed a framework to distinguish and quantify the cumulative effects. We also designed an experiment to investigate the cumulative effect of the combined utilization of physical (flow velocity), chemical (copper), and biological (propionamide) measures on algae growth inhibition. The results show that the cumulative effect of physical and chemical measures on algae growth inhibition was antagonistic; the cumulative effect of physical and biological measures was antagonistic; the cumulative effect of chemical and biological measures was synergistic, and the cumulative effect of all the measures together tended to be antagonistic. These results showed that the synergistic interactions between chemical and biological measures produced antagonistic effects when physical measures were added. Through response surface methodology analysis, we also found that the physical factor was the most significant factor affecting the cumulative effect, followed by the chemical factor and then the biological factor. Our results provide a more detailed understanding of the interaction patterns among multiple measures that affect algal growth. Importantly, this understanding can be further integrated into future strategy development to fully exploit the potential of the cumulative effect at its maximum performance.

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Section: Introductionmentioning

confidence: 99%

Cumulative Effects of Physical, Chemical, and Biological Measures on Algae Growth Inhibition

Li¹,

Wang²,

Zhang³

et al. 2022

Water

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“…With its mechanical and chemical effects, HC is successfully used for foam dust reduction, 7 − 10 quantitative addition of medicament, 9 , 11 , 12 sludge treatment, 13 − 17 water disinfection, 18 , 19 and alga removal. 20 − 22 Furthermore, it is also applied in the oxidation of organic pollutants in aqueous effluents. 23 − 26 Moreover, it has been already proven that HC can lead to a gradual disintegration of sludge suspended particles and also favors an increase of sludge solubilization.…”

Section: Introductionmentioning

confidence: 99%

Research on Noise-Induced Characteristics of Unsteady Cavitation of a Jet Pump

2022

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The dynamic cavitation characteristics of normal-temperature water flowing through a transparent jet pump under different cavitation conditions were experimentally studied by adjusting the pressure ratio. The common results are presented at different pressure ratios, including the temporal and spatial changes of the pressure and noise, together with the visual observation of the cavitation unsteady behaviors using a high-speed camera. The analyses on the measured data and images reveal that the cavitation cloud is generated by periodic oscillations of the jet traveling pressure wave and the bubble traveling pressure wave. The oscillation of the two kinds of interface waves is caused by the collapse of the bubbles, which is the main mechanism of the bubble cloud shedding. As the pressure ratio increases, the maximum length of the jet cloud and bubble cloud linearly decreases, while their oscillation frequency increases gradually. Combined with the cavitation-cloud visualization data and noise frequency analysis, it is proposed that the strong impact between the jet traveling pressure wave and the bubble traveling pressure wave is the main cause of noise. Specially, the acoustic pressure reaches the maximum when the oscillation frequency of the jet traveling pressure wave is the same as that of the bubble traveling pressure wave. Also, the jet traveling pressure wave has a great influence on the migration of bubbles in the cavity. The results can provide guidance for the optimal operating condition in cavitation applications such as jet aerator and quantitative addition.

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“…Hydrodynamic cavitation (HC) is another promising technique for water/wastewater treatment which has been receiving interest in recent years. It is a technique with great potential for several industrial applications and its effectiveness for wastewater treatment has been demonstrated (Joshi and Gogate, 2019;Batista et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Synergistic bromothymol blue dye degradation with hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

Machado¹,

Soeira²,

Pagan³

et al. 2020

Rev. ambiente água

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This study assessed the degradation of bromothymol blue in a Venturi device based on a hybrid process that combines hydrodynamic cavitation (HC) and hydrogen peroxide (H2O2). A Rotatable Central Composite Design (RCCD) was used to optimize the following variables: pressure, reaction time and molar ratio of hydrogen peroxide. Degradation efficiencies were evaluated based on Chemical Oxygen Demand (COD) and color removals before and after Venturi treatment. Maximum COD (93.42%) and color (93.28%) removals were observed at 4.0 bar inlet pressure, at a treatment time of 25 minutes and at H2O2/effluent (dye) molar ratio of 30:1. The hydrodynamic cavitation/hydrogen peroxide system has great potential to remove normally recalcitrant organic pollutants.

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Use of Hydrodynamic Cavitation for Algae Removal: Effect on the Inactivation of Microalgae Belonging to Genus Scenedesmus

Cited by 14 publications

References 26 publications

Cumulative Effects of Physical, Chemical, and Biological Measures on Algae Growth Inhibition

Cumulative Effects of Physical, Chemical, and Biological Measures on Algae Growth Inhibition

Research on Noise-Induced Characteristics of Unsteady Cavitation of a Jet Pump

Synergistic bromothymol blue dye degradation with hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

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