Removal of heavy metals from water by lignite-based sorbents

Jochová, Miluše; Punčochář, M.; Horáček, J.; Ştamberg, K.; Vopálka, D.

doi:10.1016/j.fuel.2003.11.014

Cited by 44 publications

(21 citation statements)

References 12 publications

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“…As sorption is one of the key removal mechanisms, a partial displacement of previously sorbed Ni and Zn occurred as the remaining capacity decreased and led to effluent concentrations that were higher than the influent concentrations. A higher selectivity of lignite for Cu removal (followed by Zn and Ni) was also measured by Jochová et al [44]. Anthracite had an exhaustion of the capacity before the first sampling ( Figure 5).…”

Section: Column Experimentssupporting

confidence: 74%

“…Therefore, the kinetics of the heavy metal removal is very important to characterize the suitability of a material for this application. Since the removal mechanisms in porous media are controlled by physical-chemical processes or by chemical-dominant surface reactions (i.e., adsorption, desorption, surface complexation, ion exchange, and precipitation), the capacities after several minutes or hours depend on the filter material and the substances of interest as some processes are rate limited (e.g., intraparticle transport and dissolution of carbonates) [31,43,44].…”

Section: Batch Experimentsmentioning

confidence: 99%

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Evaluation of Factors Influencing Lab-Scale Studies to Determine Heavy Metal Removal by Six Sorbents for Stormwater Treatment

Huber

Badenberg

Wulff

et al. 2016

Water

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For the development of decentralized treatment systems for road runoff, the determination of pollutant removal capacities is essential. The aim of this study was to evaluate the impact of boundary conditions on the simultaneous removal of copper, nickel, and zinc by six sorbents used for urban stormwater treatment (i.e., granular activated alumina, anthracite, granular reactivated carbon, granular ferric hydroxide, calcium carbonate, and granular activated lignite). For batch experiments, capacities were determined at initial concentrations within the range of 2.5-180 mg/L with a rotary shaker. Further influences were investigated: the use of a horizontal shaker for concentrations of up to 1080 mg/L, a variation of the initial pH value (5 and 7), and the presence of a buffer. Furthermore, the influences of the filtration process on the capacities were studied. Kinetic experiments were conducted for contact times between 5 min and 120 min. Lab-scale column experiments with inflow concentrations of 2.5 mg/L (copper and nickel) and 5.0 mg/L (zinc) at an initial pH of 5 and a contact time of 11 min were performed for comparison. Selected experiments were subsequently carried out with changes in initial concentrations and contact time. One result is that it is essential to conduct batch experiments with the metals of interest. The capacities determined by column experiments deviated from batch experiments. Batch experiments under well-defined conditions can be used to evaluate different production batches. Column experiments give a more faithful capacity by considering realistic boundary conditions and should be preferred to determine efficiencies and service lives.

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Section: Column Experimentssupporting

confidence: 74%

Section: Batch Experimentsmentioning

confidence: 99%

Evaluation of Factors Influencing Lab-Scale Studies to Determine Heavy Metal Removal by Six Sorbents for Stormwater Treatment

Huber

Badenberg

Wulff

et al. 2016

Water

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“…Mechanisms involved in heavy metal retention by biochars mainly involve: (i) the formation of metal hydroxide, carbonate, or phosphate precipitates (Uchimiya et al, 2010); (ii) ion exchange, which leads to the release of H + and other metal ions (e.g., Ca 2+ , Mg 2+ , Na + and K + ) (Mohan et al, 2007); and (iii) complexation with functional groups such as carboxyl or hydroxyl groups (Jochová et al, 2004;Ahmad et al, 2014a). The adsorption of heavy metals in the biochars is influenced by solution pH and electrolyte composition (Rivera-Utrilla and Sánchez-Polo, 2011) (Ma et al, 2010;Tong et al, 2011;Jiang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Copper and zinc adsorption by softwood and hardwood biochars under elevated sulphate-induced salinity and acidic pH conditions

et al. 2016

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“…I -V, two ratios bentonite/sand m B /m S , two values of initial Cs concentration and two different column heights were used). The transport of Cs influenced by sorption on the surface of the sorbent packed in a column can be described by 1D transport equation (9) [11,12].…”

Section: Column Experimentsmentioning

confidence: 99%

Modeling of cesium transport through sand-bentonite mixtures

2006

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The sorption and transport of Cs through mixture of Ca/Mg-bentonite and sand have been studied using five column experiments with different bentonite/sand ratio, initial Cs concentration and column height. For comparison the batch experiments with small m/V ratio and high Cs concentration were performed. The results showed that Cs removal from aqueous solution by bentonite is controlled by ion-exchange reaction between Cs and Ca/Mg initially sorbed on bentonite and that there is a consistency between the results obtained from batch equilibrium data and the results obtained from column experiments verified in the environment of PHREEQC.

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Removal of heavy metals from water by lignite-based sorbents

Cited by 44 publications

References 12 publications

Evaluation of Factors Influencing Lab-Scale Studies to Determine Heavy Metal Removal by Six Sorbents for Stormwater Treatment

Evaluation of Factors Influencing Lab-Scale Studies to Determine Heavy Metal Removal by Six Sorbents for Stormwater Treatment

Copper and zinc adsorption by softwood and hardwood biochars under elevated sulphate-induced salinity and acidic pH conditions

Modeling of cesium transport through sand-bentonite mixtures

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