CHROMIUM (III) REMOVAL FROM TANNERY WASTEWATER BY CHEMICAL PRECIPITATION

被引：0
|
作者：
Salih, Alsamani A. M. [1 ,2 ]
Osman, Osman Ateia [2 ]
Al Arni, Saleh [1 ]
Abbas, Nadir [1 ]
Benaissa, Mhamed [1 ]
机构：
[1] Univ Hail, Coll Engn, Dept Chem Engn, POB 2440, Hail 81441, Saudi Arabia
[2] Al Neelain Univ, Fac Engn, Dept Chem Engn, Khartoum, Sudan
来源：
FRESENIUS ENVIRONMENTAL BULLETIN | 2022年 / 31卷 / 07期
关键词：
Chemical precipitation; chromium removal; sodium hydroxide and calcium hydroxide; tannery wastewater; treatment; RECOVERY;
D O I：
暂无
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The removal of trivalent chromium [Cr(III)] from tannery wastewater is necessary for health regulation compliance. In this work, two precipitating agents, namely, sodium hydroxide (NaOH) and calcium hydroxide [Ca(OH)(2)] were used to remove Cr(III) from Amatong Tannery wastewater by chemical precipitation. Wastewater characterization along with the most affecting parameters such as the effect of pH on Cr(III)) removal and sludge volume, average sludge volume and the settling time were investigated. The results show that optimum pH for Cr(III) removal by NaOH and Ca(OH)(2) were found as 8.5 and 8.5-9.0, respectively, with supernatant Cr(III) concentration as 1.23 and 4.1 mg/L, respectively; the removal efficiency of NaOH was 99.94% and 99.8% for Ca(OH)(2). At optimum pH, NaOH exhibited much sludge volume, whereas Ca(OH)(2) displayed higher supernatant volume. NaOH: Ca(OH)(2) volume ratio for sludge volume at optimum pH and average sludge volume were 1:1.24 and 1:1.8, respectively.
引用
收藏
页码：7291 / 7298
页数：8
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