The effects of various control and water treatment processes on the membrane integrity and toxin fate of cyanobacteria

Fan, Jiajia; Hobson, Peter; Ho, Lionel; Daly, Robert; Brookes, Justin D.

doi:10.1016/j.jhazmat.2013.10.059

Cited by 92 publications

(53 citation statements)

References 48 publications

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“…This result is consistent with the previous findings that algae cells oxidized by lower doses of KMnO 4 can still keep their integrity (Chen and Yeh, 2005;Xie et al, 2013;Fan et al, 2014). Oxidants like KMnO 4 , H 2 O 2 , CuSO 4 , ozone and chlorine have all been proved to be capable of damaging algae cells using flow cytometer, but the damage level is highly dependent on the oxidant dose and exposure time (Wert et al, 2013;Fan et al, 2014;Zhou et al, 2014b). Interestingly, the 5-min exposure to KMnO 4 also mainly damaged the protective barrier rather than inactivating algae cells, as indicated from the low ratios of damaged cells even at KMnO 4 dose of as high as 60 mM.…”

Section: Effects Of Kmno 4 Doses On M Aeruginosa Cell Integritysupporting

confidence: 93%

KMnO 4 –Fe(II) pretreatment to enhance Microcystis aeruginosa removal by aluminum coagulation: Does it work after long distance transportation?

Lan

Miao

et al. 2016

Water Research

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a b s t r a c tKMnO 4 eFe(II) pretreatment was proposed to enhance Microcystis aeruginosa (M. aeruginosa) removal by aluminum (Al) coagulation in drinking water treatment plants (DWTPs) in our previous study. This study aims to optimize this process and evaluate the feasibility of using the process at water sources, which are usually far away from DWTPs. The optimum molar ratio of KMnO 4 to Fe(II) ½R KMnO4:FeðIIÞ is observed to be 1:3 with respect to algae removal and residual manganese (Mn) control. As indicated from flow cytometer analysis, KMnO 4 at <20 mM promisingly maintains cell integrity, with damaged cell ratios of below 10%. KMnO 4 at 30 and 60 mM damages M. aeruginosa cells more significantly and the damaged cell ratios increase to 21% and 34% after 480 min. The intracellular organic matter (IOM) release can be controlled by the subsequent introduction of Fe(II) to quench residual KMnO 4 . KMnO 4 eFe(II) pretreatment at the KMnO 4 dose of 10 mM dramatically enhances the algae removal by over 70% compared to that by Al coagulation, even if KMnO 4 and Fe(II) are introduced 480 min prior to the addition of Al 2 (SO 4 ) 3 . The Al doses can be reduced by more than half to achieve the same algae removal. Furthermore, the deposition of the tiny FeeMn precipitates formed rarely occurs, as indicated by a settleability evaluation prior to Al addition. The KMnO 4 eFe(II) process can be sequentially dosed at intake points in water sources to achieve moderate inactivation of algae cells and to enhance algae removal in DWTPs thereafter.

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Section: Effects Of Kmno 4 Doses On M Aeruginosa Cell Integritysupporting

confidence: 93%

KMnO 4 –Fe(II) pretreatment to enhance Microcystis aeruginosa removal by aluminum coagulation: Does it work after long distance transportation?

Lan

Miao

et al. 2016

Water Research

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“…A similar procedure has been used to model the release and oxidation of cell-bound cyanotoxins (produced by laboratory-cultured and natural bloom cells) using chlorine, hydrogen peroxide, potassium permanganate and copper sulphate (Fan et al, 2014;Zamyadi et al, 2013c). Rate constants for the ozonation of total microcystins (k total e M À1 s À1 ) can be derived using Equation (3), where CT, X CT , X 0 and k equal the ozone exposure, the total concentration of a specific toxin after a given ozone exposure, the total toxin concentration at the CT ¼ 0 mg min/L, and the rate at which the total toxin oxidation (k total ) occurs.…”

Section: 3mentioning

confidence: 99%

Fate of toxic cyanobacterial genera from natural bloom events during ozonation

et al. 2015

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“…Furthermore, extracellular geosmin dominated when copper sulphate had been dosed (Table 1) into the water at 1e2 mg/L (WTP#6, Fig. 2a) to control cyanobacterial bloom formation and lower the risk of cell breakthrough and accumulation in the WTP (Hobson et al, 2010;Zamyadi et al, 2013c;Fan et al, 2014). Release of high concentrations of intracellular metabolites during copper treatment of water bodies prone to bloom events has been documented (Fan et al, 2014).…”

Section: Source Water Characterizationmentioning

confidence: 99%

“…2a) to control cyanobacterial bloom formation and lower the risk of cell breakthrough and accumulation in the WTP (Hobson et al, 2010;Zamyadi et al, 2013c;Fan et al, 2014). Release of high concentrations of intracellular metabolites during copper treatment of water bodies prone to bloom events has been documented (Fan et al, 2014). However, removal of intact cells and their intracellular compounds is a preferred operational practice particularly in conventional WTPs; hence addition of copper, a heavy metal, to the source water is not recommended.…”

Section: Source Water Characterizationmentioning

confidence: 99%