Hazardous cyanobacteria integrity response to velocity gradient and powdered activated carbon in water treatment plants

Oliveira, Samylla; Clemente, Allan; Menezes, Indira; Góis, A. M.; Carloto, Ismael; Lawton, Linda A.; Neto, José Capelo

doi:10.1016/j.scitotenv.2021.145110

Cited by 11 publications

(2 citation statements)

References 52 publications

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“…As can be seen in Figure 4, the N Re would range from about 100 and 600 under the former growth conditions and about 600 and 2500 under the latter, with respective values of about 400 and 1900 at the recycling flowrate selected for this study (1.0 L min −1 ), corresponding to a residence time of 4 min and a culture speed of about 6.0 m min −1 . Even though the higher value (1900) is about 5% lower than that (2100) required to ensure a turbulence regime [56], which is often considered preferable for satisfactory mixing, it is worth reminding that the mechanical stress under these conditions could lead to the damage of cyanobacterial thricomes [57].…”

Section: Resultsmentioning

confidence: 99%

Arthrospira platensis Cultivation in a Bench-Scale Helical Tubular Photobioreactor

et al. 2022

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Cultivations of Arthrospira platensis were carried out to evaluate the CO2 capture capacity of this cyanobacterium under bench-scale conditions. For this purpose, the influence of light intensity on the microbial growth and the photosynthetic efficiency has been investigated in a helical photobioreactor. Five cultivations were performed at different photosynthetic photon flux densities (23 ≤ PPFD ≤ 225 µmol photons m−2 s−1) by fed-batch pulse-feeding pure carbon dioxide from a cylinder into the helicoidal photobioreactor. In particular, a range of PPFD (82–190 µmol photons m−2 s−1) was identified in which biomass concentration reached values (9–11 gDW L−1) significantly higher than those reported in the literature for other configurations of closed photobioreactors. Furthermore, as A. platensis suspensions behave as Newtonian and non-Newtonian (pseudoplastic) fluids at very low and high biomass concentrations, respectively, a flow analysis was carried out for evaluating the most suitable mixing conditions depending on growth. The results obtained in this study appear to be very promising and suggest the use of this helicoidal photobioreactor configuration to reduce CO2 emissions from industrial gaseous effluents.

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Section: Resultsmentioning

confidence: 99%

Arthrospira platensis Cultivation in a Bench-Scale Helical Tubular Photobioreactor

et al. 2022

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“…However, oxidation processes may result in either complete or partial cell lysis [ 9 , 10 ]. Adsorption processes have also been shown to cause shearing of cells, potentially resulting in the release of intracellular cyanotoxins [ 11 ]. Due to potential for release of intracellular cyanotoxins in either the source water or the treatment process, drinking-water utilities must consider total cyanotoxin concentrations for appropriate planning and risk management.…”

Section: Introductionmentioning

confidence: 99%

Comparative Assessment of Physical and Chemical Cyanobacteria Cell Lysis Methods for Total Microcystin-LR Analysis

Greenstein

Zamyadi

Wert

2021

Toxins

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Standardization and validation of alternative cell lysis methods used for quantifying total cyanotoxins is needed to improve laboratory response time goals for total cyanotoxin analysis. In this study, five cell lysis methods (i.e., probe sonication, microwave, freeze-thaw, chemical lysis with Abraxis QuikLyseTM, and chemical lysis with copper sulfate) were assessed using laboratory-cultured Microcystis aeruginosa (M. aeruginosa) cells. Methods were evaluated for destruction of cells (as determined by optical density of the sample) and recovery of total microcystin-LR (MC-LR) using three M. aeruginosa cell densities (i.e., 1 × 105 cells/mL (low-density), 1 × 106 cells/mL (medium-density), and 1 × 107 cells/mL (high-density)). Of the physical lysis methods, both freeze-thaw (1 to 5 cycles) and pulsed probe sonication (2 to 10 min) resulted in >80% destruction of cells and consistent (>80%) release and recovery of intracellular MC-LR. Microwave (3 to 5 min) did not demonstrate the same decrease in optical density (<50%), although it provided effective release and recovery of >80% intracellular MC-LR. Abraxis QuikLyseTM was similarly effective for intracellular MC-LR recovery across the different M. aeruginosa cell densities. Copper sulfate (up to 500 mg/L Cu2+) did not lyse cells nor release intracellular MC-LR within 20 min. None of the methods appeared to cause degradation of MC-LR. Probe sonication, microwave, and Abraxis QuikLyseTM served as rapid lysis methods (within minutes) with varying associated costs, while freeze-thaw provided a viable, low-cost alternative if time permits.

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Advances and challenges in the technologies for cyanobacterial cells removal in drinking water treatment

Xu,

Yang,

Pang

et al. 2024

Chemosphere

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Hazardous cyanobacteria integrity response to velocity gradient and powdered activated carbon in water treatment plants

Cited by 11 publications

References 52 publications

Arthrospira platensis Cultivation in a Bench-Scale Helical Tubular Photobioreactor

Arthrospira platensis Cultivation in a Bench-Scale Helical Tubular Photobioreactor

Comparative Assessment of Physical and Chemical Cyanobacteria Cell Lysis Methods for Total Microcystin-LR Analysis

Advances and challenges in the technologies for cyanobacterial cells removal in drinking water treatment

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