Characterisation of algogenic organic matter extracted from cyanobacteria, green algae and diatoms

Henderson, Rita K.; Baker, Andy; Parsons, Simon A.; Jefferson, Bruce

doi:10.1016/j.watres.2007.10.032

Cited by 618 publications

(338 citation statements)

References 25 publications

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“…In addition, for the same comparison, the charge density was also found to be significantly greater for CS-564/01 (Henderson et al, 2010a). Differences of this scale between species have previously been reported (Henderson et al 2008a(Henderson et al , 2010a; the observation that such differences in charge density can also occur between different strains of the same species is an important consideration.…”

Section: 4supporting

confidence: 69%

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

et al. 2014

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Cyanobacteria Flotation PosiDAFWater soluble polymers a b s t r a c t Dissolved air flotation (DAF), an effective treatment method for clarifying algae/cyanobacteria-laden water, is highly dependent on coagulation-flocculation. Treatment of algae can be problematic due to unpredictable coagulant demand during blooms. To eliminate the need for coagulation-flocculation, the use of commercial polymers or surfactants to alter bubble charge in DAF has shown potential, termed the PosiDAF process. When using surfactants, poor removal was obtained but good bubble adherence was observed.Conversely, when using polymers, effective cell removal was obtained, attributed to polymer bridging, but polymers did not adhere well to the bubble surface, resulting in a cationic clarified effluent that was indicative of high polymer concentrations. In order to combine the attributes of both polymers (bridging ability) and surfactants (hydrophobicity), in this study, a commercially-available cationic polymer, poly(dimethylaminoethyl methacrylate) (polyDMAEMA), was functionalised with hydrophobic pendant groups of various carbon chain lengths to improve adherence of polymer to a bubble surface. Its performance in PosiDAF was contrasted against commercially-available poly(diallyl dimethyl ammonium chloride) (polyDADMAC). All synthesised polymers used for bubble surface modification were found to produce positively charged bubbles. When applying these cationic micro-bubbles in PosiDAF, in the absence of coagulation-flocculation, cell removals in excess of 90% were obtained, reaching a maximum of 99% cell removal and thus demonstrating process viability. Of the synthesised polymers, the polymer * Corresponding author.E-mail address: r.henderson@unsw.edu.au (R.K. Henderson). 1 Current address: School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.Available online at www.sciencedirect.com ScienceDirect journal h ome page: www.elsevier.com/loca te/watres w a t e r r e s e a r c h 6 1 ( 2 0 1 4 ) 2 5 3 e2 6 2 http://dx

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Section: 4supporting

confidence: 69%

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

et al. 2014

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“…Previous studies showed that physiological and ecological structures of algae, algae activities, surface charge and algae metabolites are the primary factors that affect coagulation [14,15]. It is also found that there is a positive correlation between the removal rate of algae and turbidity removal [16].…”

Section: Removal Of Algaementioning

confidence: 99%

Test Study of Enhanced Coagulation for Conventional Treatment with Low Temperature and Low Turbidity

SONG¹,

LI²,

SUN³

et al. 2015

JRST

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Sole use of polymeric aluminum ferric chloride (PAFC) and its combination with composite polymeric aluminum ferric chloride/poly-dimethyl-diallyl-ammonium chloride coagulant (PAFC-PDMDAAC), chlorine dioxide (ClO 2 ) and composite potassium permanganate (PPC) were tested for treating retrieved water from the Yellow river during the period of low temperature and low turbidity. Such tests were carried out under full load operation in a water plant with conventional process. Results showed that the combined use of PPC and PAFC-PDMDAAC was more effective in treating influent with low temperature and low turbidity than the other coagulants. The turbidity, oxygen consumption, total trihalomethanes (THM) and absorbable organic halogens (AOX) in the effluent were compared with effluent under the sole treatment of PAFC, reduced by 76.8%, 14.2%, 60.8% and 19.4%, respectively. The operation cost, however, was only increased by 0.024 yuan/m 3 , denoting that it is a cost-effective method.

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“…DOM represents a complex of compounds and derives from main sources: allochthonous material produced from degradation of humic substances coming from runoff of terrestrial origin (Kieber et al, 2006;Miller et al, 2009); and autochthonous material, produced by autotrophic and heterotrophic in situ activities, but mainly by the bacterial degradation of phytoplankton and macrophytes (Kritzberg et al, 2004;Hanamachi et al, 2008;Henderson et al, 2008;Guillenette and Del Giorgio, 2012). The two different sources of DOM can be distinguished from differences in their optical and chemical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes in optical properties of two contrasting tropical freshwater systems

2016

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Characterisation of algogenic organic matter extracted from cyanobacteria, green algae and diatoms

Cited by 618 publications

References 25 publications

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

Test Study of Enhanced Coagulation for Conventional Treatment with Low Temperature and Low Turbidity

Seasonal changes in optical properties of two contrasting tropical freshwater systems

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