A Comprehensive Review on Sustainable Metal Recovery from E-waste based on Physiochemical and Biotechnological Methods

Navashree Nagarajan1

Parthasarathy Panchatcharam2,Email

1Junior Research Fellow-SERB, Department of Electronics and Communication Engineering, CMR Institute of Technology, Bengaluru-560037, India.
2Assistant Professor, Department of Electronics and Communication Engineering, CMR Institute of Technology, Bengaluru-560037, India.

 

Abstract

Numerous studies have been concentrated on the recovery of valuable metals from the waste printed circuit boards (WPCBs) in recent years. In this review study, metal recovery based on various physiochemical and biotechnological methods are reviewed majorly classified into five techniques: (i) physical recyclingtechniques, (ii) thermo-chemical techniques, (iii) pyrometallurgical method, (iv) hydrometallurgical method, and (v) bio-metallurgical method. Beneficially, these techniques favor reusing of valuable metals from e-waste. It is found that some of the techniques such as pyrometallurgy and hydrometallurgy has been used traditionally which requires high cost and also have some harmful effect to the environment. In order to obtain socio-economic and eco-friendly methods, the development of bioleaching using various microorganisms emerged in the field of biotechnology precedes the way to recover heavy metals. Based on the literature review, some of the important and experimentally proven techniques analysed over years have been stated in this study. The significance of recovering metals from e-waste and their applications in various fields were also discussed.

A Comprehensive Review on Sustainable Metal Recovery from E-waste based on Physiochemical and Biotechnological Methods