Influence of Coagulation on Removal of Organics by Granular Activated Carbon

Semmens, Michael J.; Staples, Alan B.; Hohenstein, Gary; Norgaard, Gregor E.

doi:10.1002/j.1551-8833.1986.tb05804.x

Cited by 15 publications

(2 citation statements)

References 10 publications

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“…Higher alum dosages have been shown to improve GAC performance for TOC, ultraviolet absorbance at 254 nm (UV 254 ), and TTHM precursor removal for Mississippi River water (MRW). 12 Improved GAC performance after more extensive coagulation has been attributed to three factors: (1) lower influent TOC concentration, (2) lower influent pH, and (3) an improvement in the adsorbable character of NOM. Several studies have demonstrated that adsorption capacity increases with decreasing initial TOC concentration utilizing batch isotherm tests.…”

Section: Figurementioning

confidence: 99%

Improving GAC performance by optimized coagulation

Hooper¹,

Summers²,

Solarik³

et al. 1996

Journal AWWA

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Optimized coagulation results in benefits ranging from DBP reduction to improved GAC run times. The effect of optimized coagulation on granular activated carbon (GAC) performance for removal of natural organic matter and control of disinfection by‐products was investigated. Coagulation optimized for total organic carbon (TOC) removal increased GAC run times by a factor of 2–3 over run times observed for GAC receiving conventionally treated water. The improved performance was mainly a result of reductions in influent TOC and pH after optimized coagulation, as compared with conventional pretreatment. Conventional coagulation prior to GAC was more cost‐effective than optimized coagulation, because of increased costs associated with the high alum dosages used in this study.

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Section: Figurementioning

confidence: 99%

Improving GAC performance by optimized coagulation

Hooper¹,

Summers²,

Solarik³

et al. 1996

Journal AWWA

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show abstract

“…The effectiveness of GAC treatment depends on NOM characteristics, including concentration and molecular size. These characteristics can be a function of pH or the effect of pretreatment processes such as coagulation and ozonation (Hooper et al, 1996; Semmens et al, 1986a, 1986b). In drinking water treatment, NOM is often quantified by a surrogate parameter such as TOC or dissolved organic carbon (DOC).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the logistic model for GAC performance in water treatment

Buchberger

Clark

et al. 2012

Journal AWWA

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Full‐scale field measurement and rapid small‐scale column test data from the Greater Cincinnati (Ohio) Water Works (GCWW) were used to calibrate and investigate the application of the logistic model for simulating breakthrough of total organic carbon (TOC) in granular activated carbon (GAC) contactors. The logistic model parameters were estimated using a nonlinear regression algorithm. The calibrated logistic model was validated using data from multiple GAC contactors operating in parallel at the GCWW Richard Miller Treatment Plant. This facility has experienced large seasonal variations in flow rate and TOC influent concentration. Proper estimation of logistic model parameters depends on the run‐time length of the GAC breakthrough data set. A critical minimum runtime threshold must be achieved to produce reliable parameter estimates. A properly calibrated logistic model provides an effective tool for accurately simulating the blended TOC concentrations in the GAC contactor effluent at a municipal drinking water treatment plant.

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Competitive Adsorption of Several Organics and Heavy Metals on Activated Carbon in Water

Mohan

Singh

2004

Water Encyclopedia

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In practice, the water/wastewater/effluents to be treated are multicomponent mixtures. Therefore, other organic or inorganic substances influence the efficacy of activated carbons. In the recent past, most of the research work has been focused on the removal of single solute from its pure solution or a particular solute from a solution having ill‐defined chemical character. The other reports available are addressed to the removal of gross organic/inorganic substances, which are measured in terms of BOD or COD from water/wastewater. In actual practice, the treatment of wastewater by activated carbon normally involves a variety of adsorbates competing for adsorption sites on the carbon surface. Thus, a thorough understanding of the competitive effect on various organic/inorganic compounds on carbon adsorption is a must. Unfortunately, very few reports/papers about the competitive adsorption on activated carbon in aqueous solution are available. Thus, a need exists to explore the current status of the competitive adsorption of various organic/inorganic substances from water/wastewater on activated carbons. Multiion systems received less attention than single ion systems. The adsorption in multicomponent systems is complicated because of the solute–solute competition and the solute‐surface interaction involved. Multicomponent interactions take place at the active adsorption sites where the solid‐liquid phase equilibrium will emerge showing a different capacity of single solute with a new set of isotherm systems. The interpretation of the multicomponent systems has proved to be complex and may be the function of one or all of the following parameters: ionic radii, electronegativity, system pH, and the availability of the active sites on the adsorbent.

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Influence of Coagulation on Removal of Organics by Granular Activated Carbon

Cited by 15 publications

References 10 publications

Improving GAC performance by optimized coagulation

Improving GAC performance by optimized coagulation

Evaluation of the logistic model for GAC performance in water treatment

Competitive Adsorption of Several Organics and Heavy Metals on Activated Carbon in Water

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