Effectiveness and mechanism of potassium ferrate(VI) preoxidation for algae removal by coagulation

Ma, Jun; Liu, Wei

doi:10.1016/s0043-1354(01)00282-2

Cited by 240 publications

(99 citation statements)

References 12 publications

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“…The introduction of chemical oxidants, i.e., KMnO 4 , Cl 2 , and O 3 , prior to coagulation can also improve algae removal, and the inactivation of algae cells plays a determining role (Ma and Liu, 2002;Chen and Yeh, 2005;Chen et al, 2008Chen et al, , 2009Shen et al, 2011;Wang et al, 2013). However, excessive inactivation with over-dosed oxidants results in significant rupture of algae cells and the release of IOM accordingly.…”

mentioning

confidence: 99%

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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confidence: 99%

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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“…Furthermore, the algae would also adversely affect the drinking water treatment process because of causing filter clogging and penetrating the filter [2,3].…”

Section: Introductionmentioning

confidence: 99%

Variation of algae scum in electro-coagulation-flotation (ECF) process

Tian¹,

Xu²,

Lu³

et al. 2015

Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015

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Abstract. Algae scum, which is inevitable in the algae water separation process, should be harvested and forbidden to discharge into the water. This paper studied the variation of algae scum in electro-coagulation-flotation (ECF) process. All experiments were conducted in the homemade electro-coagulation-flotation device, and the operating parameters included electric current density and operating time. The results showed that the variation of algae scum is affected by the operating parameters. With increasing of the electric current density and prolongation of the operating time, the moisture content of algae scum decreases gradually. On the contrary, with increasing of the electric current density and prolongation of the operating time, the slag water rate increases gradually. And the values of the moisture content and the slag water rate are relatively lower than other technologies. Overall, the results showed that the electro-coagulation-flotation (ECF) is a well suitable technology for algae water separation.

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“…The eutrophication of the semi-closed water areas has been one of the critical issues in drinking water production, because it brings about the excess growth of cyanobacteria, thereby causing various disorders in drinking water treatment processes (Widrig et al, 1996;Hitzfeld et al, 2000;Ma et al, 2002;Westerhoff et al, 2005;Huang et al, 2009). In particular, coagulation efficiency at the destabilization step is fairly susceptible to the presence of algogenic organic matter (AOM) in source water Cheng and Chi, 2003;Pivokonsky et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Surface-retained organic matter of Microcystis aeruginosa inhibiting coagulation with polyaluminum chloride in drinking water treatment

et al. 2010

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Algogenic organic matter produced by the excess growth of cyanobacteria in semi-closed water areas causes coagulation inhibition in drinking water production. In this study, hydrophilic substances of Microcystis aeruginosa, which were mainly composed of lipopolysaccharide (LPS) and RNA, were prepared, and the involvement of these cyanobacterial hydrophilic substances in coagulation inhibition was investigated. As a result, it was found that the negatively charged hydrophilic substances with a molecular weight higher than 10kDa have a significant role in coagulation inhibition. Further fractionation of cyanobacterial hydrophilic substances revealed that surface-retained organic matter (SOM), including LPS, could exhibit a potent inhibitory effect on the coagulation using polyaluminum chloride (PACl), presumably because of the direct interaction of hydrophilic SOM with cations originated from PACl, which could impede the hydrolysis of the coagulant.

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Effectiveness and mechanism of potassium ferrate(VI) preoxidation for algae removal by coagulation

Cited by 240 publications

References 12 publications

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

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

Variation of algae scum in electro-coagulation-flotation (ECF) process

Surface-retained organic matter of Microcystis aeruginosa inhibiting coagulation with polyaluminum chloride in drinking water treatment

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