Photoinactivation of Staphylococcus aureus and Vibrio parahaemolyticus in the model aquatic microcosm: effect of light intensity and dissolved biodegradable organic compound

Nola, Moı̈se; Matchim, Armelle G. Simo; Mobili, O. B.; Nougang, Mireille Ebiane; Krier, François; Chihib, Nour‐Eddine; Hornez, Jean‐Christophe; Njiné, Thomas

doi:10.2166/wst.2010.521

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…The light intensity was of the order of 0, 1,000, 2,000 and 3,000 lx. We followed the protocol described by some authors who recommend the use of 100 W Tungsten filament lamps (TESLA HOLESOVICE) to illuminate the solution (Nola et al 2010a). A lamp was placed at 25 cm above each microcosm.…”

Section: Experimental Designmentioning

confidence: 99%

Use of the aqueous extract of Eucalyptus microcorys for the treatment in microcosm, of water containing Enterococcus faecalis: hierarchisation of cells' inhibition factors

et al. 2018

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An experimental study in aquatic microcosm was carried out to determine the major factors involved in the inhibition of Enterococcus faecalis in the presence of aqueous extract of Eucalyptus microcorys. The planktonic bacterial cells remained in various concentrations of the aqueous solution at light intensities which fluctuated between 0 and 3,000 lx and incubation periods which ranged from 3 to 24 hours. A hierarchisation of studied factors revealed that the aqueous extract concentration, followed by experimental temperature, light intensity and incubation duration influence the inhibition of E. faecalis cells, respectively, with a rate of 86.82%, 7.03%, 5.25% and 0.90%. The cell abundances dropped significantly at 1.5% (λ ¼ 0.491 and F ¼ 5.518) and 2% (λ ¼ 0.568 and F ¼ 4.055) concentrations coupled with 1,000, 2,000 and 3,000 lx. The highest light intensities and extract concentration produce the highest log removal values. The disinfectant properties of E. microcorys were evaluated by the Chick-Watson model. This Chick-Watson model so obtained varied between log (N/No) ¼ À0.09 Ct and log (N/No) ¼ À0.17 Ct for extract concentrations of 1, 1.5 and 2%. Aqueous extract of E. microcorys could be used for water disinfection.

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Section: Experimental Designmentioning

confidence: 99%

Use of the aqueous extract of Eucalyptus microcorys for the treatment in microcosm, of water containing Enterococcus faecalis: hierarchisation of cells' inhibition factors

et al. 2018

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Combined Effect of Eucalyptus Microcorys Aqueous Extract and Light on Pathogenic Escherichia Coli Survival in Aquatic Microcosm

Arfao¹,

Ewoti²,

Onana³

et al. 2021

J microb biotech food sci

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Microcosm experiments were carried out to investigate the effect of Eucalyptus microcorys aqueous plant extract on pathogenic Escherichia coli survival in water. The results clearly showed that the combined effect of light and extract concentration impacted significantly survival of the bacteria. The dark inhibition coefficient (KD) was 0.102 h-1, 0.116 h-1, 0.111 h-1, 0.123 h-1, 0.136 h-1 and 0.146 h-1 with 0.05%, 0.1%, 0.5%, 1%, 1.5% and 2% of extract concentration respectively. In the light conditions, we noted a relative increase of light inhibition coefficient (KL). The Self-Organizing Map according to incubation duration of cells in the extract solution permitted to group bacterial abundances in three clusters. Cluster I is the abundance of cells registered after 24 hours incubation in the plant extract solution. Cluster II is made up of all cells abundances registered after 9 and 12 hours incubation and Cluster III is constituted by cells abundances obtained after 3 and 6 hours incubation. Globally, for extract concentration 1, 1.5 and 2%, a calculation using Chick-Watson model resulted to a value of log(N/No) = -0.1Ct which is very close to chlorine disinfectant Chick-Watson model log(N/No) = -0.16 Ct. These results can improve in the new alternative method of treatment water by plant extracts.

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The effect of CO2 addition and hydraulic retention time on pathogens removal in HRAPs

Ruas

Farias

Scarcelli

et al. 2020

Water Science and Technology

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The influence of CO2 addition and hydraulic retention time (5 and 7 days) on removal of Pseudomonas aeruginosa, Clostridium perfringens, Staphylococcus sp., Enterococcus sp., and Escherichia coli was evaluated in a system with three parallel 21 L high rate algal ponds. Both the addition of CO2 and an increase in HRT had no significant influence on bacterial removal, but bacterial removal was higher than found in previous studies. The removal was 3.4–3.8, 2.5–3.7, 2.6–3.1, 2.2–2.6 and 1.3–1.7 units log for P. aeruginosa, E. coli, Enterococcus sp., C. perfringens, and for Staphylococcus sp., respectively. Although CO2 addition did not increase disinfection, it did significantly increase biomass productivity (by ≈60%) and settleability (by ≈350%). Additionally, even at the lower 5-day hydraulic retention time, CO2 addition improves removal of chemical oxygen demand (COD), total organic carbon (TOC), total organic nitrogen and phosphorus by 97, 91, 12 and 50%, respectively.

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Photoinactivation of Staphylococcus aureus and Vibrio parahaemolyticus in the model aquatic microcosm: effect of light intensity and dissolved biodegradable organic compound

Cited by 4 publications

References 21 publications

Use of the aqueous extract of Eucalyptus microcorys for the treatment in microcosm, of water containing Enterococcus faecalis: hierarchisation of cells' inhibition factors

Use of the aqueous extract of Eucalyptus microcorys for the treatment in microcosm, of water containing Enterococcus faecalis: hierarchisation of cells' inhibition factors

Combined Effect of Eucalyptus Microcorys Aqueous Extract and Light on Pathogenic Escherichia Coli Survival in Aquatic Microcosm

The effect of CO2 addition and hydraulic retention time on pathogens removal in HRAPs

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