Cadmium and Lead Removal from Aqueous Solution by Grape Stalk Wastes: Modeling of a Fixed-Bed Column

Abstract

Grape stalk wastes generated in the wine production process were used for the removal of cadmium and lead ions from aqueous solutions. The experimental breakthrough curves (BTC) were obtained from fixedbed columns. Experiments were carried out to evaluate the influence of both inlet metal concentration and sorbent particle size. The experimental data were fitted to the Thomas model, a well-established fixed-bed sorption model. The theoretical sorption capacities obtained by the Thomas model were in good agreement with the breakthrough capacities determined from the sorption data. The CXTFIT code was used to determine the transport and sorption parameters of the convective-dispersive equation (CDE) and the two-site deterministic nonequilibrium (TSM/CDE) model by adjusting the models to the experimental breakthrough curves. The results showed that sorption capacities as well as both transport and sorption parameters were affected by the initial metal concentration as well as by the sorbent particle size.

Fixed-bed column adsorption study: a comprehensive review

“…The performance of fixed-bed column is studied by breakthrough curves, i.e., a representation of the pollutant-effluent concentration versus time profile in a fixed-bed column. The mechanism of this adsorption is based on different phenomena, like axial dispersion, film diffusion resistance, intraparticle diffusion resistance (both pore and surface diffusion) and sorption equilibrium with the sorbent (Kafshgari et al 2013;Miralles et al 2010).…”

Grape Canes from Typical Cultivars of Campania (Southern Italy) as a Source of High-Value Bioactive Compounds: Phenolic Profile, Antioxidant and Antimicrobial Activities

“…The wine production process generates a huge quantity of solid residues (skin, cane, stalk, and seed) whose management and disposal presents environmental issues. Several alternatives to the traditional disposal have been investigated, such as composting or removal of heavy metals from aqueous solutions [ 4 , 5 ] although wine residues are rich in bioactive compounds that can be recovered by suitable processes to provide valued products [ 6 ].…”

Estimation on Fixed-Bed Column Parameters of Breakthrough Behaviors for Gold Recovery by Adsorption onto Modified/Functionalized Amberlite XAD7

“…Among the adsorption processes in the column, the adsorption in a fixed bed presents some important advantages: (i) the process is continuous because the adsorbent is continuously in contact with the adsorbent; (ii) it is simple and has low costs; (iii) it can be used on an industrial scale. The disadvantages of the fixed-bed column process are: during the adsorption process, preferential routes can be formed, the adsorption being non-uniform; and the concentration profiles vary in space and time, which makes it very difficult to optimize and design the technique without a quantitative approach [ 4 , 5 ].…”