KMnO4 pre-oxidation for Microcystis aeruginosa removal by a low dosage of flocculant

Wang, Hongqiang; Mao, Tian-Guang; Xi, Beidou; Zhang, Lieyu; Zhou, Qiaohong

doi:10.1016/j.ecoleng.2015.04.015

Cited by 31 publications

(7 citation statements)

References 13 publications

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“…The impact of pre-oxidation on downflow processes should also be considered as it may influence the removal of cyanobacteria by coagulation, flocculation, and sedimentation. Previous studies have been reported that pre-oxidation has a positive impact on enhancing cyanobacterial removal through coagulation/flocculation and sedimentation [27,28,31,32,34,90]. Pre-oxidation can cause morphological deformation [82] and changes in the surface charge of the cells, leading to increased cell removal efficiency during coagulation/flocculation [37].…”

Section: Considerations On the Impact Of Pre-oxidation On Downflow Pr...mentioning

confidence: 99%

Evidence-Based Framework to Manage Cyanobacteria and Cyanotoxins in Water and Sludge from Drinking Water Treatment Plants

Jalili

Moradinejad

Zamyadi

et al. 2022

Toxins

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Freshwater bodies and, consequently, drinking water treatment plants (DWTPs) sources are increasingly facing toxic cyanobacterial blooms. Even though conventional treatment processes including coagulation, flocculation, sedimentation, and filtration can control cyanobacteria and cell-bound cyanotoxins, these processes may encounter challenges such as inefficient removal of dissolved metabolites and cyanobacterial cell breakthrough. Furthermore, conventional treatment processes may lead to the accumulation of cyanobacteria cells and cyanotoxins in sludge. Pre-oxidation can enhance coagulation efficiency as it provides the first barrier against cyanobacteria and cyanotoxins and it decreases cell accumulation in DWTP sludge. This critical review aims to: (i) evaluate the state of the science of cyanobacteria and cyanotoxin management throughout DWTPs, as well as their associated sludge, and (ii) develop a decision framework to manage cyanobacteria and cyanotoxins in DWTPs and sludge. The review identified that lab-cultured-based pre-oxidation studies may not represent the real bloom pre-oxidation efficacy. Moreover, the application of a common exposure unit CT (residual concentration × contact time) provides a proper understanding of cyanobacteria pre-oxidation efficiency. Recently, reported challenges on cyanobacterial survival and growth in sludge alongside the cell lysis and cyanotoxin release raised health and technical concerns with regards to sludge storage and sludge supernatant recycling to the head of DWTPs. According to the review, oxidation has not been identified as a feasible option to handle cyanobacterial-laden sludge due to low cell and cyanotoxin removal efficacy. Based on the reviewed literature, a decision framework is proposed to manage cyanobacteria and cyanotoxins and their associated sludge in DWTPs.

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Section: Considerations On the Impact Of Pre-oxidation On Downflow Pr...mentioning

confidence: 99%

Evidence-Based Framework to Manage Cyanobacteria and Cyanotoxins in Water and Sludge from Drinking Water Treatment Plants

Jalili

Moradinejad

Zamyadi

et al. 2022

Toxins

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“…Thus, supplementary methods may be needed to promote cyanotoxins' decomposition, which increases significantly the overall cost of the process (Geada et al 2017;Oberholster et al 2004). Although numerous studies have been performed to assess the removal efficiency of M. aeruginosa, including the use of magnetic particles (Jiang et al 2010;Lin et al 2015), coagulant/flocculant agents (Lürling et al 2017;Ma et al 2016;Qi et al 2016;Shi et al 2016;Wang et al 2015;Yuan et al 2016;Zhou et al 2014), ultrasounds (Rodriguez-Molares et al 2014, and flotation (Yap et al 2014), none of those presented a comparison between techniques. One of the few exceptions, conducted by Teixeira and Rosa (2007), showed that the best harvesting efficiencies (HEs) were obtained using coagulation/flocculation/ dissolved air flotation when compared to coagulation/flocculation/sedimentation process.…”

Section: Introductionmentioning

confidence: 99%

Comparison and optimization of different methods for Microcystis aeruginosa’s harvesting and the role of zeta potential on its efficiency

Geada

Oliveira

Loureiro

et al. 2019

Environ Sci Pollut Res

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This study has compared the harvesting efficiency of four flocculation methods, namely, induced by pH, FeCl 3 , AlCl 3 and chitosan. No changes were observed on M. aeruginosa cells. Flocculation assays performed at pH 3 and 4 have shown the best harvesting efficiency among the pH-induced tests, reaching values above 90% after 8 h. The adjustment of zeta potential (ZP) to values comprised between − 6.7 and − 20.7 mV enhanced significantly the settling rates using flocculant agents, being FeCl 3 the best example where increments up to 88% of harvesting efficiency were obtained. Although all the four methods tested have presented harvesting efficiencies above 91% within the first 8 h after the optimization process, the highest performance was obtained using 3.75 mg L −1 of FeCl 3 , which allowed reaching 92% in 4 h.

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“…2016), flotation (Chen et al, 1998), filtration (Lee et al, 2012), and many others. Advanced Oxidation Processes (AOPs) are also part of this group of techniques developed recently amongst them one can find ozonation (Miao and Tao, 2009), UV degradation (Sakai et al, 2011), and potassium permanganate oxidation (Wang et al, 2015).…”

mentioning

confidence: 99%

A comparative study on the efficiency of natural and synthetic coagulant for microalgal removal from the Nile water; effect of activated carbon addition

Moghazy¹

2020

Egypt. J. of Aquatic Biolo. and Fish.

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Removal of algae from water is an important and costly work in treating plants that produce drinking water. It will be compulsory that algae are wiped out starting with drinking water, preferably, in the early phases to ensure the minimum effect on processes subsequent (Barrado-Moreno et al., 2016). In general, algae have two reverse roles in water and wastewater, one of them is bioremediation agent for organic and inorganic pollutants (

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KMnO4 pre-oxidation for Microcystis aeruginosa removal by a low dosage of flocculant

Cited by 31 publications

References 13 publications

Evidence-Based Framework to Manage Cyanobacteria and Cyanotoxins in Water and Sludge from Drinking Water Treatment Plants

Evidence-Based Framework to Manage Cyanobacteria and Cyanotoxins in Water and Sludge from Drinking Water Treatment Plants

Comparison and optimization of different methods for Microcystis aeruginosa’s harvesting and the role of zeta potential on its efficiency

A comparative study on the efficiency of natural and synthetic coagulant for microalgal removal from the Nile water; effect of activated carbon addition

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