Assessment of the bacteriological activity associated with granular activated carbon treatment of drinking water

Stewart, Mic H.; Wolfe, Roy L.; Means, Edward G.

doi:10.1128/aem.56.12.3822-3829.1990

Cited by 98 publications

(35 citation statements)

References 22 publications

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“…In spite of ozone disinfecting, the BAC effluent had higher bacterial counts than the one from ozonation, probably because of the release of excess biofilm (Stewart et al, 1990). Our first attempt to characterize the microbial composition of the effluent showed that, among the analyzed microrganisms, the beta class is the most represented in the BAC effluent, while the alpha-proteobacteria seem the most sensitive to ozone effect.…”

Section: Discussionmentioning

confidence: 92%

Analysis of Microbiological Characteristics of Wastewater Along the Polishing Sequence of a Treatment Plant

Mezzanotte¹,

Prato²,

Sgorbati³

et al. 2004

Water Environment Research

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Microbial populations were studied by plate counts and flow cytometry along the polishing sequence of a wastewater plant. The comparison between plate count and flow cytometry showed comparable trends, but plate counts detected less than 10% of the total intact bacteria counted by flow cytometry. Six months monitoring showed that, in spite of the high ozone doses, the disinfection effect of ozonation was insignificant. This is in agreement with the variability of ozone demand, not only related to chemical oxygen demand or total suspended solids. Membrane-intact bacterial population decreased after ozonation, slightly regrew between ozone and biological activated carbon (BAC), and sharply increased after BAC, probably for damaged bacteria regrowth and saprophytes release; BAC effluent had the highest bacterial counts. Preliminary investigations on the effluent microbial composition showed that the beta Proteobacteria subclass is the most represented in the BAC effluent, whereas the alpha subclass is the most sensitive to ozone effect.

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Section: Discussionmentioning

confidence: 92%

Analysis of Microbiological Characteristics of Wastewater Along the Polishing Sequence of a Treatment Plant

Mezzanotte¹,

Prato²,

Sgorbati³

et al. 2004

Water Environment Research

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“…As observed by Morton and O l i x r (199.C), most of these proteins are induced at the beginning (from 0 to 3 h) of stress conditions, or assuming that bacterial aggregates ma!-contribute to the heterotrophic plate count. Each of these aggregates can contain a high and variable number of cells (Hicks and Rowbury 1986;Van Loosdrecht 1988;Stewart et a/. 1990).…”

Section: Observation Of Aggregatesmentioning

confidence: 99%

Resistance to chlorine of freshwater bacterial strains

1997

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The disinfectant properties of chlorine have been known for centuries but in the last few years water chlorination has attracted some criticism due to its secondary effects and the increased resistance of bacterial strains to chlorine inactivation. In this paper the kinetics of inactivation by chlorine of different Gram‐positive and Gram‐negative bacterial strains isolated from chlorinated water is studied. The Gram‐positive strains were more resistant to chlorine and the behaviour of some of them in the presence of chloramphenicol suggests either the synthesis of unique proteins or aggregation of the bacteria as mechanisms of resistance to inactivation. The concept of Ki, the inactivation rate constant, by comparison with Ks in Michaelis‐Menten enzyme kinetics (considering enzymic saturation), or with Ks in Monod growth kinetics (considering limiting rates of transport and metabolism of substrates), may be an interesting parameter to define microbial resistance to disinfectants and toxics.

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“…Carbon particles provide attractive sites for the attachment of bacteria. The number of bacteria attached to GAC particles in the effluent of a water treatment pilot plant was assessed in a study conducted by Stewart et al (1990). With scanning electron microscopy, it was found that 85% of the GAC particles harbored fewer than 50 bacteria and 8% harbored anywhere from hundreds to thousands of bacteria.…”

Section: Introductionmentioning

confidence: 99%

“…LeChevallier (1984LeChevallier ( , 1988b found that bacteria attached to GAC particles were more resistant to chlorine disinfection than free-swimming bacteria. Stewart et al (1990) reported that neither free chlorine nor combined chlorine successfully inactivated bacteria attached to GAC particles.…”

Section: Introductionmentioning

confidence: 99%

Particle‐associated coliform in secondary effluents: shielding from ultraviolet light disinfection

Parker¹,

Darby²

1995

Water Environment Research

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ABSTRACf: In this research, the effectivenessof various blending and sonication techniques were investigated for extracting particle-associated coliforms from secondary effluent samples. The amount of shielding from ultraviolet disinfection afforded these coliforms by the particulates was then assessed. It was found that blending samples for 1.5 minutes at 19000 rpm at 4°C in a mixture of chemicals (resulting in concentrations of 10-6 M Zwittergent 3-12, 10-3 M EGTA, 0.0 I M Tris buffer, 0.1 % peptone, and pH 7) resulted in the greatest recovery of particleassociated coliform, as detected by the multiple tube fermentation (MTF) test. Fragmentation of large floes during homogenization, as evidenced by the change in particle size distribution, was most likely the responsible mechanism. Sonication proved ineffective. It was found that particle association and shielding of coliforms significantly affect accurate measurements of coliform density in secondary effluent using the standard MTF test and that significantly more coliforms may be present in disinfected secondary effluents than is indicated by the standard enumeration procedure.

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Assessment of the bacteriological activity associated with granular activated carbon treatment of drinking water

Cited by 98 publications

References 22 publications

Analysis of Microbiological Characteristics of Wastewater Along the Polishing Sequence of a Treatment Plant

Analysis of Microbiological Characteristics of Wastewater Along the Polishing Sequence of a Treatment Plant

Resistance to chlorine of freshwater bacterial strains

Particle‐associated coliform in secondary effluents: shielding from ultraviolet light disinfection

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