Toxic cyanobacterial breakthrough and accumulation in a drinking water plant: A monitoring and treatment challenge

Zamyadi, Arash; MacLeod, Sherri L.; Fan, Yan; McQuaid, Natasha; Dorner, Sarah; Sauvé, Sébastien; Prévost, Michèle

doi:10.1016/j.watres.2011.11.012

Cited by 199 publications

(187 citation statements)

References 40 publications

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“…It should be noted that the intensities of both the septic and musty odors increased markedly after sedimentation. The sludge bed in the sedimentation tanks is the sink of algal cells and organic particles (Zamyadi et al, 2012;Ho et al, 2013). Release of intracellular odorants could lead to an increase of the musty odor intensity (Zamyadi et al, 2015).…”

Section: Mitigation Of the Septic And Musty Odorsmentioning

confidence: 99%

“…Organic particles including algal cells are trapped in flocs during coagulation, and then settle down in the bottom of settlers until the discharge of sludge. Algal cells trapped in sludge may rupture when the sludge residence time in the sedimentation tank was long enough (sludge was removed once a day from the sedimentation tank) or the sedimentation sludge removal was incomplete, releasing the intracellular odorants (Schmidt et al, 2002(Schmidt et al, , 2009Kommineni et al, 2009;Ho et al, 2012;Li et al, 2012aLi et al, , 2012bZamyadi et al, 2012Zamyadi et al, , 2013Zamyadi et al, , 2014Ho et al, 2013). On the other hand, anaerobic digestion could easily take place in sedimentation sludge because of the presence of algal cells and other organic materials.…”

Section: Odorant Removal In Wtpmentioning

confidence: 99%

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Simultaneous removal of multiple odorants from source water suffering from septic and musty odors: Verification in a full-scale water treatment plant with ozonation

Guo

Yang

et al. 2016

Water Research

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a b s t r a c tOzonation is known to be very effective in the removal of odorants from source water. However, it is not known if ozonation is effective in the removal of multiple odorants causing different types of odors. In this study, the removal performance for odors and odorants were evaluated in a Water Treatment Plant (WTP), which was equipped with coagulation, sedimentation, ozonation, biological activated carbon (BAC) filtration, sand filtration, and chlorination in succession and located in the downstream of the Huangpu (HP) River, over the period from April, 2014 to April, 2015. Flavor profile analysis (FPA) results showed that the source water was constantly associated with septic and musty odors. Geosmin and 2-MIB, with an average OAV of 4.54 and 1.38, respectively, were the major odorants for musty odor, while bis(2-chloroisopropyl) ether, DEDS and DMDS with an average OAV of 2.35, 1.65 and 0.78, respectively, might be responsible for the septic odor. While the musty odor could be removed effectively through the combination of ozonation and BAC, the septic odor and associated odorants required further treatment with sand filtration and chlorination for complete removal. It is clear that the advanced treatment process was effective for the treatment of source water containing complicated odorants. It should be noted that the sedimentation process needs careful management because release of odorants may occur during the treatment. The result of this study will be helpful for the mitigation of odors in WTP using source waters suffering from complicated odor problems.

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Section: Mitigation Of the Septic And Musty Odorsmentioning

confidence: 99%

Section: Odorant Removal In Wtpmentioning

confidence: 99%

Simultaneous removal of multiple odorants from source water suffering from septic and musty odors: Verification in a full-scale water treatment plant with ozonation

Guo

Yang

et al. 2016

Water Research

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“…These toxins enter water supplies after lysis of cyano-bacterial cells, as induced by water collection and treatment activities resulting in subsequent release of toxins in finished treated waters. The toxins released by bluegreen algae cannot be removed by conventional treatment methods (Merel et al, 2010;Newcombe and Nicholson, 2002;Nicholson et al, 2003;Szlag et al, 2015;Westrick et al, 2010;Zamyadi et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Risk assessment of cyanobacteria-toxins for small drinking water treatment plants with lake water intakes

Uduma¹,

McBean²,

Gharabaghi³

2017

Int. J. Water Res. Environ. Eng.

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Recent increases in the frequency and severity of toxic algae blooms in freshwater lakes has been a major concern for small communities that rely on them for drinking water supply. A hazard quotient approach to risk characterization is employed to analyze the effectiveness of five conventional treatment methods for removal of cyanotoxins. The application of the method for risk assessment and mitigation is demonstrated for five case studies, including Lake Champlain (Quebec), Coal Lake (Alberta), Butte Lake (Alberta), Kubbani Lake (Nigeria) and Bomo Lake (Nigeria).

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“…Potent toxins and other constituents of some algae are harmful to aquatic organisms, and other animals including humans. The presence of these toxins and odors associated with algal blooms presents challenges for the use of freshwaters for producing high quality, aesthetically pleasing drinking water [1,2]. While many types of algae accumulate in aquatic environments, cyanobacteria are responsible for producing seasonal mass accumulations known as cyanobacterial harmful algal blooms or cyanoHABs.…”

Section: A Backgroundmentioning

confidence: 99%

Cyanobacterial Toxins of the Laurentian Great Lakes, their Toxicological Effects, and Numerical Limits in Drinking Water

Miller

Beversdorf

Weirich

et al. 2017

Preprint

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Cyanobacteria are ubiquitous phototrophic bacteria that inhabit diverse environments across the planet. They dominate many eutrophic lakes impacted by excess nitrogen (N) and phosphorus (P) forming dense accumulations of biomass known as cyanobacterial harmful algal blooms or cyanoHABs. Their dominance in eutrophic lakes is attributed to a variety of unique adaptations including N and P concentrating mechanisms, N fixation, colony formation that inhibits predation, vertical movement via gas vesicles, and the production of toxic or otherwise bioactive molecules. While some of these molecules have been explored for their medicinal benefits, others are potent toxins harmful to humans, animals, and other wildlife known as cyanotoxins. In humans these cyanotoxins affect various tissues, including the liver, central and peripheral nervous system, kidneys, and reproductive organs among others. They induce acute effects at low doses in the parts-per-billion range and some are tumor promoters linked to chronic diseases such as liver and colorectal cancer. The occurrence of cyanoHABs and cyanotoxins in lakes presents challenges for maintaining safe recreational aquatic environments and the production of potable drinking water. CyanoHABs are a growing problem in the North American (Laurentian) Great Lakes basin. This review summarizes information on the occurrence of cyanoHABs in the Great Lakes, toxicological effects of cyanotoxins, and appropriate numerical limits on cyanotoxins in finished drinking water.

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Toxic cyanobacterial breakthrough and accumulation in a drinking water plant: A monitoring and treatment challenge

Cited by 199 publications

References 40 publications

Simultaneous removal of multiple odorants from source water suffering from septic and musty odors: Verification in a full-scale water treatment plant with ozonation

Simultaneous removal of multiple odorants from source water suffering from septic and musty odors: Verification in a full-scale water treatment plant with ozonation

Risk assessment of cyanobacteria-toxins for small drinking water treatment plants with lake water intakes

Cyanobacterial Toxins of the Laurentian Great Lakes, their Toxicological Effects, and Numerical Limits in Drinking Water

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