Lead Removal in Fixed Beds by Recycled Iron Material

Smith, Edward H.; Amini, Afshin

doi:10.1061/(asce)0733-9372(2000)126:1(58)

Cited by 28 publications

(12 citation statements)

References 19 publications

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“…By comparing the D s, theory withthe D s of 2.95 × 10 −11 m 2 /s used in the modeling, we can know that these two values are quite close to each other. Comparing the kinetic parameters obtained here with the literature showed that the values here are within the ranges reported [16][17][18]. The D s and k f for the adsorption of Cd 2+ onto aluminum oxide with an averaged diameter of 60 m were 1.5 × 10 −11 m 2 /s and 1.7 × 10 −3 m/s [17].…”

Section: Biosorption Kineticssupporting

confidence: 85%

“…The D s and k f for the adsorption of Cd 2+ onto aluminum oxide with an averaged diameter of 60 m were 1.5 × 10 −11 m 2 /s and 1.7 × 10 −3 m/s [17]. For the recycled iron material, the D s and k f values were 1.5 × 10 −14 and 1.5 × 10 −4 m/s (60 × 80 mesh) and 1.5 × 10 −11 and 1.7 × 10 −3 m/s (30 × 40 mesh), respectively as reported by Smith and Amini [18].…”

Section: Biosorption Kineticssupporting

confidence: 69%

See 1 more Smart Citation

Determination of lead biosorption properties by experimental and modeling simulation study

Chen

Wang

Zou

2007

Chemical Engineering Journal

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Section: Biosorption Kineticssupporting

confidence: 85%

Section: Biosorption Kineticssupporting

confidence: 69%

Determination of lead biosorption properties by experimental and modeling simulation study

Chen

Wang

Zou

2007

Chemical Engineering Journal

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“…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%

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

Liu¹,

Sansalone²,

Cartledge³

et al. 2001

proc water environ fed

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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).

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“…Several natural and synthetic hydrous solids have been investigated as adsorbents of heavy metals. Among these, metal oxides [3,4] and activated carbon [5] are the most extensively employed, but the high cost of these materials limits their large-scale use for the removal of metals [6,7]. Therefore, numerous approaches have been studied for the development of low-cost adsorbents such as fly ash [8], peat [9], activated sludge [2], waste slurry, and biosorbents [6,10].…”

Section: Introductionmentioning

confidence: 99%