Evidence of emerging challenge of chlorine tolerance of Enterococcus species recovered from wastewater treatment plants

Owoseni, Mojisola Christiana; Okoh, Anthony I.

doi:10.1016/j.ibiod.2017.02.016

Cited by 16 publications

(5 citation statements)

References 52 publications

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“…As a matter of fact, some authors have reported the tolerance of Enterococcus sp. to disinfection treat ments as chlorination [29]. In addition, the higher resistance of En terococcus sp.…”

Section: Homogeneous Iron Mediated Activation Of Pms and Psmentioning

confidence: 99%

Assessment of different iron species as activators of S2O82- and HSO5- for inactivation of wild bacteria strains

Rodríguez-Chueca

Guerra-Rodríguez

Raez

et al. 2019

Applied Catalysis B: Environmental

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“…As a matter of fact, some authors have reported the tolerance of Enterococcus sp. to disinfection treat ments as chlorination [29]. In addition, the higher resistance of En terococcus sp.…”

Section: Homogeneous Iron Mediated Activation Of Pms and Psmentioning

confidence: 99%

Assessment of different iron species as activators of S2O82- and HSO5- for inactivation of wild bacteria strains

Rodríguez-Chueca

Guerra-Rodríguez

Raez

et al. 2019

Applied Catalysis B: Environmental

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“…However, limitations in the use of chlorine include the production of off-tastes and odours, and potential formation of disinfection by-products (DBPs) such as trihalomethanes (THMs), Haloactic acids (HAAs), Haloacetylnitrile (HAN) and nitrosodimethylamine (NDMA) [13][14][15]. In addition, recovery of chlorine tolerant microbial pathogens at low chlorine dosages has been reported [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Chlorine Tolerance and Inactivation of Escherichia coli recovered from Wastewater Treatment Plants in the Eastern Cape, South Africa

2017

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Featured Application: This study examined the tolerance of Escherichia coli isolates, a fecal indicator of water contamination, to chlorine as a common water disinfectant and the effectiveness of chlorine at different concentrations in eliminating E. coli in wastewater effluent. Data obtained can be used as baseline monitoring data for future epidemiological surveillances that could further enhance the control of E. coli and some bacteria species of public health concern in wastewater treatment plants and ensure protection of public and environmental health.Abstract: This study investigated the survival of Escherichia coli (E. coli) recovered from secondary effluents of two wastewater treatment plants in the Eastern Cape Province, South Africa, in the presence of different chlorine concentrations. The bacterial survival, chlorine lethal dose and inactivation kinetics at lethal doses were examined. The bacterial isolates were identified by 16S rRNA gene sequencing. Comparison of the nucleotide sequences of 16S rRNA gene of bacteria with known taxa in the GenBank revealed the bacterial isolates to belong to Escherichia coli. At the recommended free chlorine of 0.5 mg/L, reduction of E. coli isolates (n = 20) initial bacterial concentration of 8.35-8.75 log was within a range of 3.88-6.0 log at chlorine residuals of 0.14-0.44 mg/L after 30 min. At higher doses, a marked reduction (p < 0.05) in the viability of E. coli isolates was achieved with a greater than 7.3 log inactivation of the bacterial population. Inactivation kinetics revealed a high rate of bacterial kill over time (R 2 > 0.9) at chlorine dose of 1.5 mg/L. This study indicates poor removal of bacteria at free chlorine at 0.5 mg/L and a greater efficacy of 1.5 mg/L in checking E. coli tolerance.

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“…The antibacterial efficacy of HClO increased as the treatment time increased. Owoseni and Okoh (2017) found that chlorine doses of 0.75 to 1.0 ppm, although very low, reduced the tolerance to HClO of Enterococcus species isolated from two wastewater treatment plants.…”

Section: How Does Chlorine Destroy Bacteria?mentioning

confidence: 96%

“…An additional advantage of chlorine is that it can easily cover large surfaces (Hulkower et al, 2011). Some studies have shown that chlorine can inhibit fungal growth at a concentration of 75 ppm (Zoffoli et al, 2005), while Owoseni and Okoh (2017) reported that the lethal dose against bacteria was 1 ppm. But is chlorine effective against viruses?…”

Section: Antecedentsmentioning

confidence: 99%

Chlorine and its importance in the inactivation of bacteria, can it inactivate viruses?

Muñoz-Castellanos¹,

Borrego-Loya²,

Villalba-Bejarano³

et al. 2021

RMF

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Sodium hypochlorite (NaClO) and its active ingredient, hypochlorous acid (HClO), are the most widely used chlorine-based disinfectants. HClO is a fast-acting antimicrobial that interacts with many biomolecules, including amino acids, lipids, nucleic acids, and sulfur containing membrane components, causing cell damage. In this review, we present examples of the effectiveness of chlorine in general disinfection procedures to inactivate bacteria and, under some conditions, bacteria in biofilms and viruses.

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Evidence of emerging challenge of chlorine tolerance of Enterococcus species recovered from wastewater treatment plants

Cited by 16 publications

References 52 publications

Assessment of different iron species as activators of S2O82- and HSO5- for inactivation of wild bacteria strains

Assessment of different iron species as activators of S2O82- and HSO5- for inactivation of wild bacteria strains

Chlorine Tolerance and Inactivation of Escherichia coli recovered from Wastewater Treatment Plants in the Eastern Cape, South Africa

Chlorine and its importance in the inactivation of bacteria, can it inactivate viruses?

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