Izvorni znanstveni članak

https://doi.org/10.31881/TLR.2020.07

Removal of Chromium(III) and Other Physical Parameters from Chrome Tan Wastewater and Recovery of Chromium from the Precipitating Sludge

Md. Minhaz Uddin ; Institute of Leather Engineering and Technology, University of Dhaka, Bangladesh
Md. Jawad Hasan ; Institute of Leather Engineering and Technology, University of Dhaka, Bangladesh
Md. Didarul Islam ; Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Bangladesh
Ashiqur Rahaman ; Institute of Leather Engineering and Technology, University of Dhaka, Bangladesh
Sayed Md. Shamsuddin ; Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Bangladesh

Sažetak

This study was adopted to investigate the removal of Cr(III) and other physicochemical parameters of chrome tan wastewater. For this purpose, three precipitating agents, CaCO3, NaHCO3, and MgO, were used to treat chrome tan wastewater. After treatment, it was found, in three different dose trials, that each agent removed almost 97-99.5 % of chromium. At the same time, it was observed that with the increase of doses, removal percentage of TDS, conductivity, and turbidity of effluent were reduced. In the case of NaHCO3 and CaCO3, Cr(III) removal percentage at optimum pH was found to be 99.97% and 99.95% respectively, whereas the maximum removal percentage for MgO was found to be 99.98%. The NaHCO3 and CaCO3 were found to be comparable to MgO for Cr(III) removal from chrome tan wastewater. The recovered chromium concentration in the sludge for NaHCO3 and CaCO3 were also similar to that of MgO. This research suggests that these two precipitating agents can be used in the same way as MgO, for Cr removal and recovery treatments. Moreover, this recovered chromium can be reused, thus reducing the environmental pollution.

Ključne riječi

Chromium, precipitation, wastewater, environment, pollution

Hrčak ID:

239379

URI

https://hrcak.srce.hr/239379

Datum izdavanja:

16.6.2020.

Posjeta: 1.227 *