Physico-chemical treatment for the degradation of cyanotoxins with emphasis on drinking water treatment—How far have we come?

Kumar, Pratik; Hegde, Krishnamoorthy; Brar, Satinder Kaur; Cledón, Maximiliano; Kermanshahi-pour, Azadeh

doi:10.1016/j.jece.2018.08.032

Cited by 29 publications

(32 citation statements)

References 126 publications

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“…This collateral effect represents an important risk for human health and other ecosystem services, as it is expected that 10-95% of the recorded blooms contain cyanotoxins (Antoniou et al 2005;Sivonen and Jones, 1999). Human exposure to these toxins may occur through ingestion of drinking-water and during recreational use of water bodies with cyanobacterial blooms (He et al, 2016;Stewart et al, 2006;Pantelić et al, 2013;Kumar et al, 2018). A number of episodes of human and animal poisoning by ingestion of cyanotoxins-bearing water have been reported since the late 1800s (Antoniou et al, 2005;Carmichael, 1994).…”

Section: Introductionmentioning

confidence: 99%

Degradation of widespread cyanotoxins with high impact in drinking water (microcystins, cylindrospermopsin, anatoxin-a and saxitoxin) by CWPO

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Degradation of widespread cyanotoxins with high impact in drinking water (microcystins, cylindrospermopsin, anatoxin-a and saxitoxin) by CWPO

et al. 2019

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“…This suggests that MC-LR removal lessened in the presence of NOM in the biofilters compared with the nonbioaugmented filter (FC). This can be attributed to the scavenging between the NOMs and the oxidants formed during the oxidation reaction (Kumar et al 2018a), which has been reported to decrease the reaction rate by >50% (Verma and Sillanpää 2015).…”

Section: Mc-lr Analysis and Residual Ozone Determinationmentioning

confidence: 97%

Ozonation in Tandem with Biosand Filtration to Remove Microcystin-LR

2020

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A hybrid ozonation-biofiltration approach is evaluated to understand the necessity and concentration of ozone dose in removing the micropollutant microcystin-LR (MC-LR). To simulate real polluted water, three levels of natural organic matter-1, 2, and 5 mg=L-and cyanobloom intensity-low, medium, and high-under ozone exposure times-C1: 0.8 mg × min=L and C2: 1.6 mg × min=L-were studied (18 combinations in total). The feasibility of filter bioaugmentation (postozone treatment) using known MC-LR degraders Arthrobacter ramosus (Filter FA) and Bacillus sp. (Filter FB) is also discussed and compared with the feasibility of a noninoculated sand filter. Overall, the bioaugmented sand filters, FA and FB, enhanced filter performance by 19.5% and 10.5% for C1 samples and 6% and 2% for C2 samples, respectively, in terms of MC-LR removal. All three filters, including the control (FC), showed a negative correlation (FA: −0.987; FB: −0.973; FC: −0.977) between "residual ozone" and "MC-LR removal due to ozonation." However, A. ramosus (Filter FA) showed strong resilience toward the residual ozone (0.1-0.4 mg=L) and did not affect MC-LR removal due to filtration as much as it affected Filters FB and FC. Only Filter FA showed a significant difference (p-value: 0.047) between bloom condition and MC-LR removal that showed less removal of the latter at higher bloom intensity and vice versa. Statistical analysis, too, suggested a strong influence of natural organic matter (NOM) on filter performance for MC-LR removal. Also, protein phosphatase inhibition assay (PPIA) toxicity showed less toxic by-product formation when native bacteria were co-cultured and inoculated with A. ramosus and Bacillus sp.) in a sand filter. Hence, combined ozonation-biofilter treatment using co-inoculation may simplify (eco)toxicological and biotransformation research. This will enable the study of diverse contaminants under other environmental parameters.

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“…Physical and/or chemical treatments (e.g., reverse osmosis, chlorine, and ozone) are effective for removal of MCs, and several are regularly used in drinking water treatment facilities (Kumar et al, 2018). In addition, efforts have been made to develop alternative strategies for MC removal, e.g., the heterologous expression of the MlrA enzyme (Wang et al, 2017; Dexter et al, 2018), bioreactors with immobilized Escherichia coli expressing the MlrA enzyme (Dziga et al, 2014), or inoculated with MC degrading bacteria (Tsuji et al, 2006; Phujomjai et al, 2016; Kumar et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Source Community and Assembly Processes Affect the Efficiency of Microbial Microcystin Degradation on Drinking Water Filtration Membranes

et al. 2019

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Microbial biofilms in gravity-driven membrane (GDM) filtration systems can efficiently degrade the cyanotoxin microcystin (MC), but it is unclear if this function depends on the presence of MC-producing cyanobacteria in the source water habitat. We assessed the removal of MC from added Microcystis aeruginosa biomass in GDMs fed with water from a lake with regular blooms of toxic cyanobacteria (ExpL) or from a stream without such background (ExpS). While initial MC removal was exclusively due to abiotic processes, significantly higher biological MC removal was observed in ExpL. By contrast, there was no difference in MC degradation capacity between lake and stream bacteria in separately conducted liquid enrichments on pure MC. Co-occurrence network analysis revealed a pronounced modularity of the biofilm communities, with a clear hierarchic distinction according to feed water origin and treatment type. Genotypes in the network modules associated with ExpS had significantly more links to each other, indicating that these biofilms had assembled from a more coherent source community. In turn, signals for stochastic community assembly were stronger in ExpL biofilms. We propose that the less “tightly knit” ExpL biofilm assemblages allowed for the better establishment of facultatively MC degrading bacteria, and thus for higher overall functional efficiency.

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Physico-chemical treatment for the degradation of cyanotoxins with emphasis on drinking water treatment—How far have we come?

Cited by 29 publications

References 126 publications

Degradation of widespread cyanotoxins with high impact in drinking water (microcystins, cylindrospermopsin, anatoxin-a and saxitoxin) by CWPO

Degradation of widespread cyanotoxins with high impact in drinking water (microcystins, cylindrospermopsin, anatoxin-a and saxitoxin) by CWPO

Ozonation in Tandem with Biosand Filtration to Remove Microcystin-LR

Source Community and Assembly Processes Affect the Efficiency of Microbial Microcystin Degradation on Drinking Water Filtration Membranes

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