Regeneration of Granular Activated Carbon (GAC) Columns Used for Removal of Lead

Reed, Brian E.; Robertson, Jared; Jamil, M.

doi:10.1061/(asce)0733-9372(1995)121:9(653)

Cited by 19 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These are responsible for enhanced adsorption of singly charged PbOH + species through surface complexation model at higher pH (above 5.0). The adsorption of PbOH + on the oxide/hydroxide phases of SNR is in accordance with the observations of Reed et al [26,27] that the surface pH is higher by 0.5-1 unit in comparison to the solution pH thereby causing hydrolysis of lead. The SEM examination (Fig.…”

Section: Effect Of Phsupporting

confidence: 90%

Systematic studies on adsorption of lead on sea nodule residues

Agrawal

Sahu

Pandey

2005

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Section: Effect Of Phsupporting

confidence: 90%

Systematic studies on adsorption of lead on sea nodule residues

Agrawal

Sahu

Pandey

2005

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…For example, based on the current media capacity, reducing the diameter of the MOPM from current 3.44-mm to 1-mm, all other media characteristics remaining constant (the same coating thickness), the adsorption capacity per gross media weight would increase by a factor of 30. This adsorption capacity is comparable with these reported for granular activated carbon (GAC) (Reed et al 1996;Reed et al 1995), iron oxide coated sand and iron sorbent (Sansalone 1999a;1999b;Smith and Amini 2000). Competitive adsorption behavior of Zn, Cd, Cu and Pb onto MOPM is clearly shown in the results as illustrated in Figure 6.…”

Section: Batch Adsorption Equilibriasupporting

confidence: 86%

“…Comparing the column breakthrough results of MOPM with granular activated carbon (GAC) (Reed et al 1996;Reed et al 1995), iron oxide coated sand and iron sorbent (Benjamin et al 1996;Sansalone 1999a;1999b;Smith and Amini 2000), MOPM has a comparable removal capability for divalent heavy metal removal. The MOPM can be a viable alternative adsorption medium for heavy metal removal and take advantage of buoyant characteristics for designing upflow heavy metal removal devices such as sorptive buoyant media clarifiers (SBMC).…”

Section: Column Breakthrough Studymentioning

confidence: 99%

Divalent Heavy Metal Removal Using Manganese Oxide Coated Polymeric Media for Storm Water Treatment

Liu¹,

Sansalone²,

Cartledge³

et al. 2001

proc water environ fed

View full text Add to dashboard Cite

Urban storm water runoff mobilizes and transports significant loads of heavy metals. Promulgation of NPDES Phase II regulations has spurred development of Best Management Practices (BMPs) for treatment of urban storm water. Recent BMP designs provide both adsorption and filtration using engineered media such as manganese oxide coated polymeric media (MOPM). In this study, a method was developed to coat spherical polymeric media with an iron oxide scratch coating and a manganese oxide outer coating creating a buoyant polymeric media with a specific gravity less than 1.0. SEM images and BSE thin section images depict a porous MOPM surface with a dense coverage of rough spherically-shaped manganese oxides. The oxide coating increased media specific surface area from less than 0.1-m 2 /g to 27-m 2 /g, provided a negatively charged surface (PZC = 4.0), and significantly greater adsorption capacity for the divalent heavy metals studied. Freundlich adsorption isotherms were fit to batch equilibrium data. Results indicate the adsorption onto the MOPM is very sensitive to the pH. The order of adsorption affinity on this manganese oxide coated media for the four divalent heavy metals studied is Pb(II) > Cu(II) > Cd(II) > Zn(II). Triple layer surface complexation model were used to model the adsorption equilibrium of divalent heavy metal for MOPM. The intrinsic surface acidity constants for MOPM were determined using FITEQL-TLM and are int 1 log a K =3.196 and int 2 log a K = -5.802. The intrinsic surface reaction constants for divalent heavy metals studied are int log Pb K = -1.91, int log Cu K = -2.53 and intlog Zn K = -4.45. Adsorption rates for MOPM in the flowthrough batch system were rapid with over 50% removal in the first 30 minutes and over 90% removal within 5 hours. A chemisorption kinetic model, the Elovich model, was applied successfully to fit batch kinetic data. Results of batch equilibrium and column breakthrough indicated that MOPM had a comparable removal capability to other commercial and research sorptive media. The MOPM can be a viable alternative adsorption medium for heavy metal removal while taking advantage of buoyant media characteristics for designing upflow Best Management Practices (BMPs), such as sorptive buoyant media clarifiers (SBMC).

show abstract

“…Equations that are often used to describe the experimental isotherm data were developed by Freundlich and Langmuir. The Freundlich isotherms are used most commonly to describe the adsorption characteristics of the resin used in solutions or wastewater treatment [26][27][28][29].…”

Section: Adsorption Isothermsmentioning

confidence: 99%