Abstract
The adsorption of Cu(II), Cd(II) and Ni(II) ions from aqueous solutions by activated sludge and dried sludge was investigated under laboratory conditions to assess its potential in removing metal ions. The adsorption behavior of metal ions onto activated sludge and dried sludge was analyzed with Weber–Morris intra-particle diffusion model, Lagergren first-order model and pseudo second-order model. The rate constant of intra-particle diffusion on activated sludge and dried sludge increased in the sequence of Cu(II) > Ni(II) > Cd(II). According to the regression coefficients, it was observed that the kinetic adsorption data can fit better by the pseudo second-order model compared to the first-order Lagergren model with R 2 > 0.997. The adsorption capacities of metal ions onto activated sludge and dried sludge followed the sequence Ni(II) ≈ Cu(II) > Cd(II) and Cu(II) > Ni(II) > Cd(II).
Highlights
Heavy metal ions such as Cu(II), Ni(II), Zn(II), Cd(II) and Pb(II) are among the toxic inorganic pollutants that may cause environmental problem, at low concentration in surface or subsurface water
The adsorption behavior of metal ions onto activated sludge and dried sludge was analyzed with Weber–Morris intra-particle diffusion model, Lagergren first-order model and pseudo second-order model
The adsorption behavior of heavy metals on activated sludge and dried sludge was analyzed with Weber–Morris intraparticle diffusion model, Lagergren first-order model and pseudo second-order model
Summary
Heavy metal ions such as Cu(II), Ni(II), Zn(II), Cd(II) and Pb(II) are among the toxic inorganic pollutants that may cause environmental problem, at low concentration in surface or subsurface water. Removal of the metal ions from the cellular surface of microbial biomass could be attributed to physical adsorption, complexation or chemical adsorption (Ting et al 1991). The high adsorption capacities of Cd(II) and Cr(VI) ions by Staphylococcus xylosus and Pseudomonas sp. In this work, activated sludge and dried sludge were used as adsorbents for removing Cu(II), Cd(II) and Ni(II). The excess biological sludge waste from the biological reactor can be used as a low cost adsorbent for metal ion removal. The adsorption behavior of heavy metals on activated sludge and dried sludge was analyzed with Weber–Morris intraparticle diffusion model, Lagergren first-order model and pseudo second-order model
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