Cr (VI) Removal From Tannery Wastewater by Syrian Natural Pyrite as a Reducing Agent

Ali Zhairy¹ , Areej Adra² , Muhammad Ghafar³

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.6 , pp.1-5, Dec-2020

Online published on Dec 31, 2020

Copyright © Ali Zhairy, Areej Adra, Muhammad Ghafar . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
In this study, the Syrian natural pyrite from Hosen Suleiman area in Safita/Tartous governorate was used as a reducing agent to remove Hexavalent chromium Cr(VI) from tannery wastewater in aerobic conditions. The result showed that pyrite was a sole phase and mainly composed of Fe (43.2%) and S (40.3%) as well as other impurities (16.5%). The analysis of tannery effluent revealed high values of TDS (28.5g/L), COD (3680mg/L), BOD520 (1500mg/L), and Cr(VI) (13.5mg/L). Batch experiments, as a function of contact time, pH, adsorbent dosage, and initial Cr(VI) concentration, were carried out to determine the optimal removal conditions for Cr(VI). The results showed that:(1) contact time was 6 hours to reach a state of equilibrium. (2) The Cr(VI) reduction was found to be pH dependent and occurred under acidic conditions of pH 2.2-2.5. (3) The Cr (VI) reduction rate increased with a decrease in initial Cr (VI) concentration as the rate of Cr(VI) removal was dependent on the initial pyrite concentration. Eventually, these conditions were applied on real tannery wastewater for Cr(VI) removal. The study demonstrated that the percentage of Cr(VI) removal was found to be 77%.

Key-Words / Index Term :
Syrian pyrite, Cr(VI) removal, tannery wastewater

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