Effects of ferric ion on bioleaching of heavy metals from contaminated sediment.

IF 2.5 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Water Science and Technology Pub Date : 2003-11-01 DOI:10.2166/WST.2003.0464

S. Y. Chen, J. Lin, C. Y. Lee

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引用次数: 18

Abstract

Bioleaching is one of the promising procedures for removal of heavy metals from contaminated sediments. The advantages of this biotechnology are that it is easy, efficient, less costly and friendly to the environment. However, the principal disadvantage of this process is its slow kinetics in metal solubilization, which may limit practical application of the bioleaching process. In order to enhance the rate and efficiency of metal solubilization, the ferric ion was used as a catalytic agent in the bioleaching process. It was found that the sediment pH apparently decreased in the bioleaching after addition of ferric ion. The metal solubilization increased quickly after the addition of ferric ion. The rate of metal solubilization was enhanced by the addition of ferric ion, especially for Cr and Pb. An increase in the amount of ferric ion added increased the final efficiency of metal solubilization. The highest final efficiency of metal solubilization was obtained in the bioleaching with 1 g/L of ferric ion. Besides, the growth of sulfur-oxidizing bacteria was not affected by addition of ferric ion in the bioleaching. It was concluded that the kinetics of metal solubilization were enhanced by addition of ferric ion in the bioleaching process.

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铁离子对污染沉积物中重金属生物浸出的影响。

生物浸出是去除污染沉积物中重金属的一种很有前途的方法。这种生物技术的优点是操作简单、效率高、成本低、对环境友好。然而，该工艺的主要缺点是其缓慢的金属增溶动力学，这可能限制了生物浸出工艺的实际应用。为了提高金属的溶出速率和效率，在生物浸出过程中采用了铁离子作为催化剂。结果表明，在生物浸出过程中，添加铁离子后，沉积物pH值明显降低。加入铁离子后，金属的增溶作用迅速增强。铁离子的加入提高了金属的增溶速度，特别是对Cr和Pb。随着铁离子加入量的增加，最终金属增溶效率提高。当铁离子浓度为1 g/L时，金属的最终溶出效率最高。此外，在生物浸出过程中添加铁离子对硫氧化菌的生长没有影响。结果表明，在生物浸出过程中，铁离子的加入增强了金属的增溶动力学。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Science and Technology 环境科学-工程：环境

CiteScore

4.90

自引率

3.70%

发文量

366

审稿时长

4.4 months

期刊介绍： Water Science and Technology publishes peer-reviewed papers on all aspects of the science and technology of water and wastewater. Papers are selected by a rigorous peer review procedure with the aim of rapid and wide dissemination of research results, development and application of new techniques, and related managerial and policy issues. Scientists, engineers, consultants, managers and policy-makers will find this journal essential as a permanent record of progress of research activities and their practical applications.