A Novel Method for Heavy Metal Removal

The removal of lead and arsenic ions using Atlantic Cod (Gadus morhua) fish scale involves ion exchange, chemisorption, and precipitation of its constituents and is competitive with respect to adsorption onto the negatively charged heterogeneous substrates. The nonlinear sorption equilibrium concept is preceded by pore diffusion of the solute and is utilised for numerical modelling of this binary adsorption. Numerical simulation data demonstrate reasonable agreements with experimental results of dynamic column tests. Sensitivity analyses confirm that parameters such as porosity, adsorption coefficient, mobility of ions, and number of sorption sites contribute significantly to breakthrough interval of contaminant in dynamic columns. At lower pH values (7-8.04), the adsorption coefficients of cations such as lead are significantly lower than at pH value of 11.0. L'élimination des ions de plomb et d'arsenic grâceà l'utilisation desécailles de morues de l'Atlantique (Gadus morhua) comprend deséchanges ioniques, des adsorptions chimiques et la précipitation de ses composants. Cette méthode est efficace par rapportà l'adsorption dans des substrats hétérogènes négativement chargés. Le concept de l'équilibre de la sorption non linéaire est précédé par la diffusion interstitielle des solutés et est utilisé pour créer des modèles numériques de cette adsorption binaire. Les données de simulation numérique sont conformes aux résultats expérimentaux des essais dynamiques en colonne. Les analyses de sensibilité confirment que des paramètres tels que la porosité, le coefficient d'adsorption, la mobilité ionique, ainsi qu'un certain nombre de sites de sorptions contribuent de manière considérableà l'apparition d'intervalles de contaminant dans les tests dynamiques en colonnes.

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“…Mustafiz et al (2002) conducted a series of batch tests with the Godus Morhua Scales of different sizes. Table 3.…”

Section: Methodsmentioning

confidence: 99%

Extension of the pore diffusion approach for modelling binary adsorption of lead and arsenic ions in a fixed‐bed column packed with atlantic cod fish scales

2010

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“…Tunali et al [27] observed maximal absorption of lead in 15 min with Bacillus sp. An extraordinary low rate in the kinetics of lead sorption was reported by Mustafiz et al [28] using fish scales, reached equilibrium at 120 hours.…”

Section: Sorption Kineticsmentioning

confidence: 99%

“…It is assumed that as soon as the adsorption process proceeds, the adsorbed sorbate tends to be released and eventually the rates of adsorption and desorption adjust in a state of equilibrium. Thus, a static equilibrium is reached in a relatively longer period than a dynamic equilibrium [28]. Once this equilibrium has been reached, adsorption becomes irreversible since very little metal will be released even if the solution remains under constant agitation [31].…”

Section: A Bautista-hernández Et Al 210mentioning

confidence: 99%

Zinc and Lead Biosorption by Delftia tsuruhatensis: A Bacterial Strain Resistant to Metals Isolated from Mine Tailings

Bautista-Hernández¹,

Ramírez-Burgos²,

Duran-Páramo³

et al. 2012

JWARP

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A bacterial strain capable of Zinc and Lead biosorption was isolated from mine tailings. This strain showed the highest minimum inhibitory concentrations (MIC) of metals among other isolates in metal-resistance tests. Sorption tests were conducted placing 0.015 g of dry biomass in 10 ml of metallic solution at fixed pH. Contact was analyzed at different times (kinetics) and different initial concentrations (isotherm). The biomass was separated by centrifugation and the concentration of non-absorbed metal was determined using atomic absorption spectroscopy. The strain was identified by 16S sequencing as Delftia tsuruhatensis. The order of toxicity of the metals to the bacterium was Zn > Pb > Se > Ni > Cu = Al. Zinc and Lead absorption kinetics were adjusted to the pseudo second order equation (r 2 = 0.99), showing that equilibrium was reached at 40 and 20 min, respectively. Maximal absorption of Pb and Zn was 0.216 and 0.207 mmol·g -1 , respectively; which can be considered a median magnitude capacity when compared to other biosorbents described in the literature.

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“…Ricordel et al (2001) have studied the adsorption capacity of the active coal obtained from the peanut in retaining the Pb 2þ, Zn 2þ , Ni 2þ , and Cd 2þ ions from wastewater by adsorption. Other studies were made with egg shells (Tsai et al, 2008), ash obtained by coal burning (Papandreou et al, 2007;Matheswaran and Karunanithi, 2007), red clay (Namasivayam et al, 2002), grape residues (Farinella et al, 2007), active coal (Dash and Murthy, 2010;Elaigwu et al, 2009;Hasar, 2003;Khalkhali and Omidvari, 2005;Teker and Imamoglu, 1999;Yahaya et al, 2011;Yantasee et al, 2004), cellulose (Greben et al, 2009;Thanh and Nhung, 2009;Yan Yan et al, 2009), maize (Zvinowanda et al, 2010), plants Typha latifolia (Mânios et al, 2003), fish scales (Mustafiz et al, 2002), and biomass obtained from mushrooms (Sag, 2001). Karapinar Kapdan and Kargi (2000) have investigated the removal of some dyes from the wastewater by means of active coal, zeolites, wood chips, and ash resulting by the wood burning.…”

Section: Environmental Processesmentioning

confidence: 99%