废印刷电路板中重金属浸出行为的长期静态浸泡实验

A long-term static immersion experiment on the leaching behavior of heavy metals from waste printed circuit boards.

作者信息

Zhao Guo-Hua, Luo Xing-Zhang, Chen Gui, Zhao Yong-Jun

机构信息

College of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, People's Republic of China.

出版信息

Environ Sci Process Impacts. 2014 Aug;16(8):1967-74. doi: 10.1039/c4em00099d.

DOI:10.1039/c4em00099d

PMID:24934650

Abstract

Printed circuit boards (PCBs) are the main components of electrical and electronic equipment (EEE). Waste PCBs contain several kinds of heavy metals, including Cu, Pb and Zn. We characterize the leaching of heavy metals (Cu, Pb, Zn and Ni) from waste PCBs in a pH range of 3.0 to 5.6 using a novel approach based on batch pH-static leaching experiments in this work. The results indicate that the leaching behavior of Cu, Pb, Zn and Ni is strongly dependent on pH. Leaching behavior also varies with different pH values and leaching times. The maximum concentrations of Cu, Pb, Zn and Ni in leachate from waste PCBs were 335.00, 17.57, 2.40 and 2.33 mg L(-1), respectively. The highest Pb, Ni, and Cu concentrations leached significantly exceeded the European Union waste-acceptance limit values with respect to inert waste landfills. The leaching of metals follows the shrinking core model with surface reaction control.

摘要

印刷电路板（PCBs）是电气和电子设备（EEE）的主要组件。废弃印刷电路板含有多种重金属，包括铜、铅和锌。在本研究中，我们采用一种基于批次pH静态浸出实验的新方法，对废弃印刷电路板在pH值为3.0至5.6范围内重金属（铜、铅、锌和镍）的浸出特性进行了表征。结果表明，铜、铅、锌和镍的浸出行为强烈依赖于pH值。浸出行为也随不同的pH值和浸出时间而变化。废弃印刷电路板浸出液中铜、铅、锌和镍的最大浓度分别为335.00、17.57、2.40和2.33 mg L(-1)。浸出的铅、镍和铜的最高浓度大大超过了欧盟关于惰性废物填埋场的废物接受限值。金属的浸出遵循表面反应控制的收缩核模型。