Impact of chlorination on cell inactivation, toxin release and degradation of cyanobacteria of development and maintenance stage

Xi, Li; Chen, Sheng; Zeng, Jie; Chabi, Kassim; Song, Weidong; Xian, Xuanxuan; Yu, Xin

doi:10.1016/j.cej.2020.125378

Cited by 29 publications

(24 citation statements)

References 45 publications

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“…Although this study demonstrated that moderate chlorination (1 mg L À1 ) eliminated the risk of elevated DOC after PACl coagulation, other undesirable metabolites (e.g., cyanotoxins; taste/odor compounds) would be released after cell rupture (Zamyadi et al 2012;Fan et al 2013;Li et al 2020aLi et al , 2020b. Notably, disinfection by-products would be another troubled problem after chlorination, since previous study found that AOMs could be important precursors to form DBPs after chlorination (Zamyadi et al 2012;Zhou et al 2014;Wu et al 2019).…”

Section: Practical Implicationmentioning

confidence: 73%

“…The two parameters were measured using a two-channel fluorometer (AmiScience, USA). Microcystis samples were filtered with 0.45 μm Millipore filter before the measurement of dissolved organic carbon (DOC) and DOC concentration was measured by persulfate wet oxidation technique (Shimadzu TOC-V WP, Japan), as also described by Li et al (2020aLi et al ( , 2020b. Cellular size of Microcystis was measured with a Bettersize2600E laser particle size distribution instruments (Jinke, China).…”

Section: Methodsmentioning

confidence: 99%

“…It was purchased from the Institute of Hydrobiology, Chinese Academy of Sciences. The strain was cultured in BG11 medium at 28°C with a 12 h:12 h light-dark cycle under light intensity of 35 μmol m À1 s À1 (Li et al 2020a(Li et al , 2020b. Culture volume of 1 L was employed with an inoculation volume of 1: 10, and these cultures were shake once at 10:00am in each day.…”

Section: Materials and Reagentsmentioning

confidence: 99%

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Cyanobacterial biomass: a striking factor to decrease polyaluminium chloride (PACl) coagulation efficiency during a successive bloom

Song

Zeng

et al. 2021

Water Supply

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Occurrence of cyanobacterial blooms in source waters challenges water treatment processes. During a successive bloom, typical characteristics of elevated cell-density and pH was observed from development to maintenance stage. However, studies about their influences on coagulation process were limited. Here, PACl coagulation experiments were conducted to investigate Microcystis removal with varied pH and cell-density. Results showed that PACl coagulation alone was sufficient to remove Microcystis with low cell-density (105–106 cells mL−1), since elevated pH value (8.5–9.5) can promote PACl coagulation possibly ascribed to sweeping cells via neutral gelatinous precipitate of alum. Nevertheless, elevated cyanobacterial biomass was a striking factor to decrease Microcystis removal (80–100%) by PACl coagulation, since its inhibitory effects on coagulation process could not be offset by in situ elevated pH value. Chlorination-assisted (1 mg L−1) coagulation was recommended to treat cyanobacteria-laden source waters with high cell-density of >107 cells mL−1, as it promoted cyanobacterial removal and achieved the highest removal ratio of DOC and turbidity among these treatments. These findings would provide an important reference for water supplies to choose proper water treatment process to treat cyanobacteria-laden source waters during a successive bloom.

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Section: Practical Implicationmentioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Section: Materials and Reagentsmentioning

confidence: 99%

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Cyanobacterial biomass: a striking factor to decrease polyaluminium chloride (PACl) coagulation efficiency during a successive bloom

Song

Zeng

et al. 2021

Water Supply

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“…However, dominance of Eucapsis sp., Microcystis wesenbergii, and Anabaena osaquae might result in a decrease in numbers of others (Fares et al, 2020). Because these species in Cyanophyta assemblage has an effect on ltration, they are hard to be digested and also for the reason of that they release toxins, leading to changes in biodiversity (Yang et al, 2017;Li et al, 2020). After that, there are some detailed species of Bacillariophyta assemblage.…”

Section: Species Of Phytoplankton Assemblagementioning

confidence: 99%

Temporal variation revealed the composition change of phytoplankton assemblage responds to varied environmental indicators within an artificial freshwater engineered ecosystem

Xu¹,

Wang²,

Chen³

et al. 2021

Preprint

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Artificial freshwater engineering ecosystems (AFwEEs) have attracted more and more attention. Phytoplankton is critical to the fluctuation of water quality in the AFwEEs. However, there is still a major knowledge gap regarding the ecology, composition, and temporal dynamics of phytoplankton assemblage composition in AFwEEs. Hence, an AFwEEs designed base on the submerged macrophytes (i.e., Vallisneria natans, Najas marina, and Potamogeton crispus) and fishes (i.e., Hypophthalmichthys molitrix, Hypophthalmichthys nobilis, and Ctenopharyngodon idellus) was established. The initial purpose for this survey was to conduct almost entire year (April/2019 – December/2019) sampling investigation to explain the interactions and relationship between multifarious environmental indicators and phytoplankton, also for the different phenomenon explanation of composition change in phytoplankton assemblage between AFwEEs and natural water environments. Consequences exhibited the assemblage dynamics of the phytoplankton were significant varied with seasonal succession, in which Cyanophyta dominated the phytoplankton assemblage while the mean relative abundance accounted for 66.4%, and then was Chlorophyta, for 18.8%. Principal component analysis (PCA) demonstrated temporal variation was significant impacted on phytoplankton assemblages. The dominant species, different assemblages, and distribution of phytoplankton were closely related to the dynamic changes of seasonal succession, which might change the composition of phytoplankton assemblage in the FwAEEs. Results of redundancy analysis (RDA) revealed the water temperature, nutrient concentration, DO concentration, and pH value were the main abiotic environmental indicators affecting phytoplankton assemblage. The trend of the four diversity indices indicated the phytoplankton assemblage became more stable in winter while the change extent of that was more significant in summer.

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“…Catalysts 2020, 10, x FOR PEER REVIEW 5 of 11 The development of cyanobacterial blooms is a seasonal phenomenon, mainly influenced by the water temperature but also by the availability of nutrients [17]. On the other hand, it must be noted that the bloom itself is a successional process that includes growth, maintenance and decay stages [18,19]. Accordingly, notable fluctuations in cyanotoxin concentration are expected in the drinking water sources affected by cyanobacterial blooms.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Wet Peroxide Oxidation of Cylindrospermopsin over Magnetite in a Continuous Fixed-Bed Reactor

et al. 2020

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The development of cost-efficient and environmentally friendly technologies for the removal of cyanotoxins from water is crucial, given the increasingly frequent appearance of toxic cyanobacterial blooms. In this work, the application of catalytic wet peroxide oxidation (CWPO) promoted by natural magnetite for the removal of the highly toxic cyanotoxin cylindrospermopsin (CYN) has been investigated. A fixed-bed reactor packed with magnetite powder and granules was used to treat a continuous flow of CYN-bearing water. Experiments were carried out under ambient conditions and circumneutral pH (pH0 = 5). The effect of the main variables of the process, viz. magnetite load (8–14 g), feed flow rate (0.1–0.25 mL min−1), H2O2 dose (0.5–8 mg L−1) and initial CYN concentration (25–100 mg L−1), were systematically analyzed. CYN conversion values and kinetic constants were calculated to evaluate the feasibility of the catalytic system. The process was highly effective in the removal of the cyanotoxin, achieving up to 80% CYN conversion under optimized conditions (flow rate = 0.2 mL min−1, [H2O2]0 = 5 mg L−1, WFe3O4 = 14 g, pH0 = 5, T = 25 °C). It also showed reasonable activity (~55% CYN conversion) in two real samples (pond and river water). The decay on CYN conversion in these cases was mainly due to the scavenging of hydroxyl radicals by the co-existing species present in the matrices. Remarkably, the catalytic system showed high stability with limited iron leaching (the iron leached at the end of the experiments represented less than 0.2 wt.% of the catalyst’s initial iron content) in all cases. Its stability was further confirmed in a long-term continuous experiment (60 h time on stream). Furthermore, the magnetite granules at the top layer of the packed bed avoided the loss of magnetite powder from the reactor, confirming the suitability of the system for continuous long-term application.

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Impact of chlorination on cell inactivation, toxin release and degradation of cyanobacteria of development and maintenance stage

Cited by 29 publications

References 45 publications

Cyanobacterial biomass: a striking factor to decrease polyaluminium chloride (PACl) coagulation efficiency during a successive bloom

Cyanobacterial biomass: a striking factor to decrease polyaluminium chloride (PACl) coagulation efficiency during a successive bloom

Temporal variation revealed the composition change of phytoplankton assemblage responds to varied environmental indicators within an artificial freshwater engineered ecosystem

Catalytic Wet Peroxide Oxidation of Cylindrospermopsin over Magnetite in a Continuous Fixed-Bed Reactor

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