The use of microemulsions to remove chromium from industrial sludge

被引：30

作者：

Dantas, T. N. Castro ^{[1
]}

Oliveira, K. R. ^{[1
]}

Dantas Neto, A. A. ^{[2
]}

Moura, M. C. P. A. ^{[2
]}

机构：

[1] Univ Fed Rio Grande do Norte, Dept Quim, BR-59072970 Natal, RN, Brazil

[2] Univ Fed Rio Grande do Norte, Dept Engn Quim, BR-59072970 Natal, RN, Brazil

来源：

WATER RESEARCH | 2009年 / 43卷 / 05期

关键词：

Leather sediments; Digestion process; Chromium; Microemulsion; Scheffe Net; EXTRACTION; BEHAVIOR; METALS;

D O I：

10.1016/j.watres.2008.12.047

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this work microemulsion systems were used to remove chromium from leather tannery sediments. The sludge was treated by a solid-liquid extraction process (acid digestion). The effects of particle size, digestion temperature and digestion time with regards to the efficiency of chromium removal were considered. The raw sludge (3 Mesh) was dried, grounded and sieved. Particles with 3, 14, 65, 100, 200, and 325 Mesh were evaluated. Sludge digestion solutions were prepared using each studied granule size at 25 degrees C, 70 degrees C, and 95 degrees C. Microemulsion extraction experiments to remove chromium III from the acid digestion solution were made according to a Scheffe Net experimental design methodology, using microemulsion systems inside the Winsor II region (System I) and inside the microemulsion region (Winsor IV - System II). A statistical treatment was used to obtain the isoresponse plots. Chromium extraction percentages were up to 73.3% for System I and up to 93.4% for System II. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1464 / 1470

页数：7

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