Removal of chromium from Cr(VI) polluted wastewaters by reduction with scrap iron and subsequent precipitation of resulted cations

被引:227
作者
Gheju, M. [1 ]
Balcu, I. [2 ]
机构
[1] Politehn Univ Timisoara, Fac Ind Chem & Environm Engn, Timisoara 300223, Romania
[2] Natl Inst Res & Dev Electrochem & Condensed Matte, Timisoara 300587, Romania
关键词
Hexavalent chromium; Scrap iron; Packed column; Horizontal clarifier; Wastewater treatment; ELECTROPLATING WASTE-WATER; ZERO-VALENT IRON; AQUEOUS CONTAMINANT REMOVAL; PERMEABLE REACTIVE BARRIER; HEXAVALENT CHROMIUM; METALLIC IRON; CHROMATE REDUCTION; KINETICS; REMEDIATION; NANOPARTICLES;
D O I
10.1016/j.jhazmat.2011.09.002
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This work presents investigations on the total removal of chromium from Cr(VI) aqueous solutions by reduction with scrap iron and subsequent precipitation of the resulted cations with NaOH. The process was detrimentally affected by a compactly passivation film occurred at scrap iron surface, mainly composed of Cr(III) and Fe(III). Maximum removal efficiency of the Cr(total) and Fe(total) achieved in the clarifier under circumneutral and alkaline (pH 9.1) conditions was 98.5% and 100%, respectively. The optimum precipitation pH range which resulted from this study is 7.6-8.0. Fe(total) and Cr(total) were almost entirely removed in the clarifier as Fe(III) and Cr(III) species: however, after Cr(VI) breakthrough in column effluent, chromium was partially removed in the clarifier also as Cr(VI), by coprecipitation with cationic species. As long the column effluent was free of Cr(VI), the average Cr(total) removal efficiency of the packed column and clarifier was 10.8% and 78.8%, respectively. Our results clearly indicated that Cr(VI) contaminated wastewater can be successfully treated by combining reduction with scrap iron and chemical precipitation with NaOH. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:131 / 138
页数:8
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