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Removal of chromium(VI) from wastewater through ion exchange. Kinetic and scale up studies

Ahmad Syed Waqas, Zafar Muhammad Shahzad, Ahmad Sajjad, Zia-Ul-Haq M., Ashraf Muhammad, Rabbani Javed, Ullah Sami

Environment Protection Engineering

2019

Vol. 45, nr 1

17--29

Chromium(VI) ions were removed from industrial wastewater. In this regard, a rig was fabricated carrying alkaline anion resin. Various experiments were carried out by varying pH, temperature and volumetric flow rate of solution by employing a rig to study the kinetics of the ion exchange process. The rate constant (k) and maximum solid phase concentration of exchanged solute (q0) were calculated using the Thomson equation to scale up the purification process of industrial runoff of chromium(VI) from the tanning, photography and ceramic industry. Experimental optimization revealed that developed setup will remove chromium(VI) to a level of 5 mg/dm3 from 300 mg/dm3 in 40 000 dm3 of wastewater. To achieve the best results for the flow rate of 10 000 3 3/day, 12.03 kg of anionic resin were recommended by fixing the pH of the setup at 7.4 while maintaining the treatment temperature at 20 °C.

Parametric optimization of coal desulfurization through Alkaline leaching

Rehman F., Ahmad S. W., Zafar M. S., Ahmad S., Zia-Ul-Haq M.

Polish Journal of Chemical Technology

2018

Vol. 20, nr 3

103--109

Desulfurization of Pakistani coal has been carried out through alkaline leaching. During present experimental investigation, the effect of operating parameters like alkali concentration, time, temperature and particle size has also been analyzed, graphically represented and critically discussed. Parametric optimization of leaching process has been carried out by using response surface methodology (RSM) based on central composite design (CCD). The analysis of variance (ANOVA) was performed in order to assess the highest level interactions of variables and three way interactions were observed significant. Further, the optimum value of total sulfur removal was observed as 53% when the operatic conditions fixed at 10% W/V, 60 min, 80°C and 140 mesh for alkaline concentration, leaching time, temperature and particle size, respectively.