Algal Control by Low-Frequency, Low-Power Ultrasonic in Eutrophic Water Bodies

Jiang, Deng Ling; Ni, Guo Wei; Zhang, Yu Min; You, Suya

doi:10.4028/www.scientific.net/amr.433-440.811

Cited by 4 publications

(7 citation statements)

References 10 publications

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“…Advanced oxidation systems include ozonation 36 , ozone/hydrogen peroxide 37,38 , ozone/UV 39 , hydrogen peroxide/UV 40 , UV/chlorine [41][42][43] , UV/TiO 2 44 , ultrasonic irradiation 45 or sonolysis 46,47 , photocatalysis 48,49 , photo fentons 50 , dielectric barrier discharge 51,52 and electrochemical 53 reactions, which all work by producing short-lived but highly reactive free radicals and have been used most effectively in combined systems for the degradation or destruction of complex organic compounds in water. A thorough investigation is needed in the Western Cape on viable advanced oxidation technologies to add to the conventional treatment train of coagulation, flocculation, adsorption, precipitation, reverse osmosis, membrane bioreactors, nanofiltration and electrodialysis, recognising that the treatment of sewage and wastes is just as important to public health as the supply of fresh water is.…”

Section: Implications Of Findings For Desalinationmentioning

confidence: 99%

Desalination and seawater quality at Green Point, Cape Town: A study on the effects of marine sewage outfalls (with corrigendum)

Petrik¹,

Green²,

Abegunde³

et al. 2017

S. Afr. J. Sci.

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This paper presents our collection methods, laboratory protocols and findings in respect of sewage pollution affecting seawater and marine organisms in Table Bay, Cape Town, South Africa, then moves to consider their implications for the governance of urban water as well as sewage treatment and desalination. A series of seawater samples, collected from approximately 500 m to 1500 m offshore, in rock pools at low tide near Granger Bay, and at a depth under beach sand of 300-400 mm, were investigated for the presence of bacteriological load indicator organisms including Escherichia coli and Enterococcus bacteria. A second series of samples comprised limpets (Patella vulgata), mussels (Mytilus galloprovincialis), sea urchins (Tripneustes ventricosus), starfish (Fromia monilis), sea snails (Tegula funebralis) and seaweed (Ulva lactuca), collected in rock pools at low tide near Granger Bay, and sediment from wet beach sand and where the organisms were found, close to the sites of a proposed desalination plant and a number of recreational beaches. Intermittently high levels of microbial pollution were noted, and 15 pharmaceutical and common household chemicals were identified and quantified in the background seawater and bioaccumulated in marine organisms. These indicator microbes and chemicals point to the probable presence of pathogens, and literally thousands of chemicals of emerging concern in the seawater. Their bioaccumulation potential is demonstrated.In respect of proposed desalination, the findings indicate that desalinated seawater must be subjected to treatment protocols capable of removing both bacterial loads and organic chemical compounds. The terms of reference for desalination plants must specify adequate testing and monitoring of chemical compounds as well as microorganisms in the intake and recovered water. Drinking water supplied by the proposed seawater desalination plants should be carefully tested for its toxicity.In respect of water management, our findings suggest the need for the City of Cape Town to move to an integrated water and sewage management plan that treats urban water, including seawater, as a circulating system that is integral to the health of the City, and which excludes marine outfalls.

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Section: Implications Of Findings For Desalinationmentioning

confidence: 99%

Desalination and seawater quality at Green Point, Cape Town: A study on the effects of marine sewage outfalls (with corrigendum)

Petrik¹,

Green²,

Abegunde³

et al. 2017

S. Afr. J. Sci.

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“…AGRIEAST 2020 Vol.14 (2): 1-8 DOI: http://doi.org/10.4038/agrieast.v14i2.92 2 water quality issue in drinking water supply reservoirs. Algae massively reproduce under sufficient nitrogen and phosphorus (Jiang et al, 2012). Algae population causes serious problems.…”

Section: Removal Of Algae By Sonicatormentioning

confidence: 99%

“…Hence aquatic organisms die due to oxygen deficient. Thus ecological equilibrium of water body is destroyed by algal bloom (Jiang et al, 2012). Algae population not only increase water turbidity but also the source of undesirable taste and odour concerns (Hitzfeld et al, 2000).…”

Section: Removal Of Algae By Sonicatormentioning

confidence: 99%

“…The sound layer has a direct impact on the buoyancy of the algae. The algae cells will sink to the bottom and are unable to photosynthesize and eventually die due to a lack of light (Jiang et al, 2012). Ultra-sonic can destroy the algae by initially physical pathways that the main destroying performed by cavitation phenomena (Lee et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Removal of algae by sonicator: a case study from per Aru reservoir

Thurkka

Anoja²,

Mikunthan

et al. 2020

AGRIEAST: J. Agri. Sci.

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“…In the current research, the focus is placed on the causes and species of red tide. On this basis, biological, physical and chemical methods [5][6][7] have been developed to control red-tide algae, namely, controlling algae growth using the nutrient antagonism in plant, killing the algae with chemical reagents and optically controlled ultraviolet radiation. In addition, field sampling and remote sensing [8,9] have been adopted to monitor red tide.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Acoustic Measurement of Prorocentrum Donghaiense Concentrations

Qin¹,

Shang²

2019

I2M

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Through lab acoustic measurement, this paper explores the features of backscattering ultrasound waves in Prorocentrum donghaiense (P. donghaiense) at different concentrations, and establishes the correlation curves between the integrated backscatter (IBS), an indicator of backscattering intensity, and P. donghaiense concentration. The experimental results show a highly linear correlation between the IBS with low concentration, and a reduced linear correlation between the IBS with high concentration; the reduction is attributable to the acoustic attenuation effect of dense algae particles in the high concentration solution. Then, the acoustic measurement performance was improved through particle size correction, leading to a good overall characterization effect. Finally, the proposed method was proved valid through data analysis. The research findings shed new light on acoustic monitoring of phytoplankton concentration, and provide a good reference to the forecast, prevention and control of marine red tides.

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Algal Control by Low-Frequency, Low-Power Ultrasonic in Eutrophic Water Bodies

Cited by 4 publications

References 10 publications

Desalination and seawater quality at Green Point, Cape Town: A study on the effects of marine sewage outfalls (with corrigendum)

Desalination and seawater quality at Green Point, Cape Town: A study on the effects of marine sewage outfalls (with corrigendum)

Removal of algae by sonicator: a case study from per Aru reservoir

Laboratory Acoustic Measurement of Prorocentrum Donghaiense Concentrations

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