Evaluation of &lt;i&gt;Escherichia coli&lt;/i&gt; as indicator of point-of-use chlorination efficiency of drinking water

Adebisi, Olusoji Olusegun; Ifeyinwa, S. Obuekwe; Akinsolu, Folahanmi T.; Olayemi, A. B.

doi:10.4314/jasem.v20i4.7

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…EF-TU in V. cholerae is more sensitive to oxidative stress than E. coli EF-TU, suggesting EF-TU may increase chlorine susceptibility in V. cholerae (Wholey and Jakob 2012). This aligns with our results, and those of previous work, that culturable V. cholerae undergoes greater log reduction than culturable E. coli after water chlorination, and has a lower contact time and disinfectant concentration factor (CT-factor) (Adebisi et al 2017;CDC 2019;Jones et al 1992).…”

Section: Resultssupporting

confidence: 90%

“…Only one organism was evaluated for potential surrogacy. Of the limited existing research on surrogates for V. cholerae, two studies demonstrated promising findings with E. coli in suspension testing, thus we chose to focus on E. coli to expand that work to surface disinfection (Adebisi et al 2017;Jones et al 1992). Following WHO recommendations for surface disinfection in outbreak settings, we tested with a chlorine compound (NaDCC), which prior work has shown to be equivalent to other chlorine compounds in disinfection efficacy of E. coli and V. cholerae (Gallandat et al 2017;String et al 2020).…”

Section: Resultsmentioning

confidence: 99%

“…Surrogates are ideally simple and inexpensive to test, and slightly more resistant to disinfection than the pathogen of interest (Sinclair et al 2012). To identify potential surrogates for V. cholerae, we performed a literature review and found two relevant studies in which culturable Escherichia coli and culturable V. cholerae were compared in suspension tests, with results suggesting that E. coli is slightly more resistant to chlorine disinfection than V. cholerae (Adebisi et al 2017;Jones et al 1992). Both organisms have also demonstrated sensitivity to protein aggregation when exposed to chlorine (Winter et al 2008), suggesting that they may undergo similar inactivation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Culturable E. coli as Surrogate for Culturable V. cholerae in Surface Disinfection Testing with Chlorine

et al. 2021

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During outbreaks, contaminated surfaces can contribute to the spread of cholera; as such, surface disinfection with chlorine is widely recommended. However, confirmation of surface disinfection efficacy against Vibrio cholerae requires testing for the V. cholerae bacteria, which is not commonly completed in outbreak settings. We investigated whether culturable Escherichia coli (commonly measured in outbreak settings) is an appropriate surrogate for culturable V. cholerae by conducting experiments using 0.02% chlorine made with sodium dichloroisocyanurate (NaDCC) on six nonporous and porous surfaces. Across all test conditions, culturable E. coli were reduced by 1.3 to >6.9 log and culturable V. cholerae by 4.9 to 7.0 log. Results suggest culturable E. coli is a conservative surrogate for culturable V. cholerae, and it is recommended that E. coli can be used in households and health care facilities in cholera outbreaks as a conservative indicator of adequate disinfection. Further research is recommended on the relative importance of fomite transmission in cholera contexts, the role that viable but nonculturable (VBNC) V. cholerae (not tested herein) might have in transmission, and potential surrogates for VBNC V. cholerae.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Culturable E. coli as Surrogate for Culturable V. cholerae in Surface Disinfection Testing with Chlorine

et al. 2021

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“…These findings comply with Fouad et al (2017aFouad et al ( , 2017c and Keeley et al (2014Keeley et al ( , 2016 who recorded that the recovered coagulants act as fresh coagulants, showing nearly the same water quality except for organic characteristics. Focusing on the bacterial count in the treated water, however, the key factors influencing the bacterial count reductions are the disinfectant dose and contact time (Adebisi et al, 2016), and coagulant efficacy contributes greatly in achieving efficient disinfection (Branz et al, 2017). Therefore, bacterial count was considered as one of the parameters evaluating the coagulant efficiency.…”

Section: Resultsmentioning

confidence: 99%

Repeated Aluminum Sulfate Recovery from Waterworks Sludge: A Case Study in El‐Sheikh Zaid WTP

Fouad¹,

Razek

El-Gendy

2018

Water Environment Research

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Although surface water treatment presents a good solution for pollutants in rivers and freshwater lakes, the purification process itself presents a great threat to the aquatic environment through aluminum waste disposal. Recent studies have introduced coagulants recovery from treatment sludge as a green solution for waste handling and cost reduction. This article aims to evaluate repeated aluminum coagulants recovery from sludge using sulfuric acid. The waste from El-Sheikh Zaid Water Treatment Plant (ESZ-WTP) was characterized, then sequential coagulants recovery using optimum conditions was conducted. In addition, treated water was analyzed to determine the efficiency of the obtained coagulants and their influence on treated water quality. Sequential coagulants recovery using acidification revealed that no metals accumulation took place in the produced coagulants until the third recovery from ESZ-WTP sludge. On the other hand, a noticeable increase in trihalomethanes was detected in the treated water, especially using the third recovered coagulant. In conclusion, sequential coagulants recovery and usage in water treatment is an attractive alternative for single-use original coagulant in ESZ-WTP but for no more than three sequential recoveries. It is advisable to apply a fresh coagulant every three sequential recoveries to enrich the aluminum content and regenerate the sludge before restarting the recovery process. Water Environ. Res., 90, 2030Res., 90, (2018.

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“…Access to safe drinking water has improved over the last decades in most parts of the world, but approximately 1.1 billion people still lack access to safe potable water, and over 2.6 billion worldwide lack access to adequate sanitation which causes water-borne diseases (Ademola et al, 2011;Adebisi et al, 2016). In Nigeria, majority of the rural populace do not have access to potable water (Oyedeji and Moninuola, 2011).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Physicochemical and Bacteriological Properties of Borehole Water in Selected Areas of Benin City, Edo State

Obuekwe¹,

Oshoma²,

Omorogbe³

2021

NJLS

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Water is important in African towns and cities, and its quality is paramount to public health. This study therefore, assessed the physicochemical and bacteriological properties of borehole water samples from agricultural, animal farm, and residential areas in Benin City, Edo state. Physicochemical and bacteriological analyses of water samples were based on standard methods. Sheep blood agar was used for hemolytic bacterial isolation, and isolates were subsequently assessed for antibiotic resistance to common antibiotics using Kirby-Bauer disc diffusion method. Physicochemical parameters of borehole water samples assessed were within World Health Organization (WHO) standard with the exception of Total Suspended Solids (TSS). Bacterial analyses revealed counts (1.01±0.10×104 to 4.80±0.10×104 cfu/mL) that were above WHO standard of 100 cfu/ mL as well as high coliform count (1.20 ± 0.23 - 3.00 ±0.63 MPN/10 mL) above WHO standard of 0 MPN/ml. Shigella sp. (23.29%) and Bacillus cereus (21.92%) were the two isolates that occurred most in the study. Hemolytic bacterial pathogens recovered were Bacillus cereus, Staphylococcus aureus, Bacillus subtilis and Micrococcus sp. All four pathogens were resistant to the antibiotic ceftriaxone but Staphylococcus aureus had multiple antibiotic resistant index (MRI) of 0.8 before plasmid curing. This study has shown that borehole water could be sources of bacterial pathogens and therefore, should be properly treated before use. This would help to reduce the incidence of waterborne infections in communities.

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Evaluation of <i>Escherichia coli</i> as indicator of point-of-use chlorination efficiency of drinking water

Cited by 5 publications

References 6 publications

Culturable E. coli as Surrogate for Culturable V. cholerae in Surface Disinfection Testing with Chlorine

Culturable E. coli as Surrogate for Culturable V. cholerae in Surface Disinfection Testing with Chlorine

Repeated Aluminum Sulfate Recovery from Waterworks Sludge: A Case Study in El‐Sheikh Zaid WTP

Evaluation of Physicochemical and Bacteriological Properties of Borehole Water in Selected Areas of Benin City, Edo State

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