Abstract
The objective of this work is to utilize a coal beneficiation tailing from Moatize (Mozambique) for the adsorption of hexavalent chromium from water in batch model and fixed bed column. Coal waste was used in particle size between 0.7 and 1.5 mm. The effects of pH, contact time and solid adsorbent concentration were analyzed by batch experiments. The results indicated that it was possible to obtain 98.6% of removal under the experimental conditions of pH 2, 10 h of process and 8 g.L-1 of solid adsorbent. From these experimental results, equilibrium isotherms were build and Langmuir and Sips models presented a better fit to the experimental data. The adsorption of chromium hexavalent from aqueous solution onto coal waste was investigated in a fixed bed column at 298 K. The effects of the inlet concentration, feed flow rate, bed depth on adsorption were investigated. In general, the evaluated parameters improved as a results increase in a Z (bed deep) and decreases in Q (feed flow rate). These performance metrics also improved as C0 (inlet concentration) was increased.
Highlights
Coal mining is criticized for its harmful environmental impact and especially for the large-scale production and inappropriate disposal of waste and by-products that cause acid mine drainage (AMD), which has been a significant environmental problem
To minimize chromium contamination, this study used as solid adsorbent a coal tailing (R1) from Moatize (Mozambique), with adsorption in aqueous solutions in batch and fixed-bed column
We described the fixed-bed column behavior in this study using breakthrough curves, with plots of time vs. C/C0
Summary
Coal mining is criticized for its harmful environmental impact and especially for the large-scale production and inappropriate disposal of waste and by-products that cause acid mine drainage (AMD), which has been a significant environmental problem. This problem results from the microbial oxidation of iron pyrite in presence of water and air, leading to an acidic solution that contains toxic metal ions. To minimize chromium contamination, this study used as solid adsorbent a coal tailing (R1) from Moatize (Mozambique), with adsorption in aqueous solutions in batch and fixed-bed column. Langmuir and Sips models and the Bohart-Adams model were used to describe the breakthrough curves
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
