Elements of water bacteriology, with special reference to sanitary water analysis

Prescott, S. C.; Winsløw, Carl

doi:10.5962/bhl.title.54917

Cited by 6 publications

(6 citation statements)

References 32 publications

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“…(Taj and Baqai, 2007). Similarly, alum was not an effective killing agent for cholera organisms (Prescott et al, 1997). Another study reported that alum significantly reduced bacteria, but it did not kill or destroy typhoid and cholera organisms (Prescott et al, 1997).…”

Section: Coagulative Effect Of Plant Extracts and Alum On Untreated Wmentioning

confidence: 96%

Coagulation and disinfection in water treatment using Moringa

Ahmed¹,

Kanwal

Hassan

et al. 2010

Proceedings of the Institution of Civil Engineers - Water Manag

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A low-cost technology for drinking water purification involving plant extracts that are harmful to potentially pathogenic bacteria was developed. The methanolic and aqueous extracts of different parts of the Moringa oleifera vegetable tree were examined for their antibacterial and coagulation properties. The extracts from buds and shoots showed more antibacterial activities against Staphylococcus aureus, Bacillus cereus var. mycoides, Pseudomonas aeruginosa, Klebsiella pneumonia and Shigella flexneri at 378C than those obtained from leaves and seeds. The lowest minimum inhibitory concentrations and minimum bactericidal concentrations were observed for buds and shoots, and not for seeds and leaves. The seeds were associated with higher coagulation activity in comparison with other parts of the plant and alum. These results suggest that bud and seed extracts can be used for water treatment, avoiding the risk of contamination by water-borne pathogens and promoting an indigenous solution to disease control and environmental management.

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Section: Coagulative Effect Of Plant Extracts and Alum On Untreated Wmentioning

confidence: 96%

Coagulation and disinfection in water treatment using Moringa

Ahmed¹,

Kanwal

Hassan

et al. 2010

Proceedings of the Institution of Civil Engineers - Water Manag

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“…The following admonition by Prescott and Winslow (1904) should be kept in mind by any investigator who attempts to use microbiological data obtained from water: The quest for a mathematical relationship between pathogens and other nonpathogenic microorganisms began as soon as results on microbial concentrations were obtained from various water types.…”

Section: Introductionmentioning

confidence: 99%

Pathogens in Water: Value and Limits of Correlation with Microbial Indicators

2010

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This article discusses the value and limitations of using microbial indicators to predict occurrence of enteric pathogens in water. Raw or treated sewage is a primary source of fecal contamination of the receiving surface water or groundwater; hence, understanding the relationship between pathogens and indicators in sewage is an important step in understanding the correlation in receiving waters. This article presents three different datasets representing different concentrations of pathogens and microbial indicators: sewage containing high concentrations of pathogens and indicators, surface water with variable concentrations, and groundwater with low concentrations. In sewage, even with very high levels of microorganisms, no mathematical correlation can predict the type or concentration of any pathogen. After discharge in the environment, direct correlation becomes biologically improbable as dilution, transport, and different inactivation rates occur in various environments. In surface waters, advanced statistical methods such as logistic regression have provided some level of predictability of the occurrence of pathogens but not specific counts. In groundwater, the continuous absence of indicators indicates an improbable occurrence of pathogen. In contrast, when these indicators are detected, pathogen occurrence probability increases significantly. In groundwater, given the nature and dissemination pattern of pathogenic microorganisms, a direct correlation with fecal microbial indicators is not observed and should not be expected. However, the indicators are still useful as a measure of risk. In summary, many pathogens of public health importance do not behave like fecal microbial indicators, and there is still no absolute indicator of their presence, only a probability of their co-occurrence.

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“…The survival and concentration of E. coli in the floc suggested the presence of other pathogenic enteric organisms (Bulson et al 1984). Another study reported that alum significantly reduced bacteria but it did not kill or destroy the greater strength of typhoid and cholera organisms (Prescott et al 1997).…”

Section: Antibacterial Activity Against Waterborne Pathogensmentioning

confidence: 99%

Evaluation and Risk Management by UsingOcimum bacillicumAgainst Waterborne Pathogens

Ahmed

Ayub

Khan

2011

Human and Ecological Risk Assessment: An International Journal

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Food and medicinal plants have been used for centuries against human diseases. The methanolic and aqueous extracts of different parts of Ocimum bacillicum Lam. (Niazboo or Sweet basil) of family Lamiaceae were investigated in vitro for their antibacterial properties against waterborne pathogens. The antibacterial properties of different parts of Ocimum bacillicum samples were assessed against Gram positive and Gram negative bacteria, which were isolated from water samples and identified by the API 20E method. The extracts from leaves and seeds of Ocimum bacillicum showed more antibacterial activities against Staphylococcus aureus, Pseudomonas aeruginosa, and E. coli at 37 • C than those obtained from shoots, roots, and buds. The lowest minimum inhibitory concentrations and minimum bactericidal concentrations were observed for leaves and seeds as compared to other parts of the plant. No activity of alum was observed against the tested bacterial strains. The seeds of Ocimum bacillicum were associated with higher coagulation activity in comparison to other parts of the plant and were comparable with alum. These results suggest that parts of a plant offer a potential for antimicrobial treatment of drinking water, but needs further exploration.

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Elements of water bacteriology, with special reference to sanitary water analysis

Cited by 6 publications

References 32 publications

Coagulation and disinfection in water treatment using Moringa

Coagulation and disinfection in water treatment using Moringa

Pathogens in Water: Value and Limits of Correlation with Microbial Indicators

Evaluation and Risk Management by UsingOcimum bacillicumAgainst Waterborne Pathogens

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