Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran.
Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran.
J Environ Manage. 2019 Nov 15;250:109502. doi: 10.1016/j.jenvman.2019.109502. Epub 2019 Sep 6.
There is a substantial volume of mobile phone waste every year. Due to the disadvantages of traditional methods, it is necessary to look for biological processes that are more eco-friendly and economical to recover metals from e-waste. Fungi provide large amounts of organic acids and dissolve metals but using sucrose in the medium is not economical. In this paper, the main objective is to find a suitable alternative carbon substrate instead of sucrose for fungi bioleaching of Ni and Cu in printed circuit boards (PCBs) of mobile phones using Penicillium simplicissimum. Four kinds of carbon sources (including sucrose, cheese whey, sugar, and sugar cane molasses) were selected. Also, pH and number of spores in inoculum were optimized by response surface methodology (RSM) for all carbon sources. The results showed the simultaneous maximum recovery of Cu and Ni is not possible. For Cu recovery, sugar is the best economical and simplistic medium instead of sucrose. Maximum recovery of Cu (90%) gained at the pH of 7, 3.3 × 10 spores, and in sugar. The amount of Ni recovery (89%) was highest in molasses, at the pH of 2, and 10 spores. The results proved non-conventional carbon sources improve bioleaching efficiency and the possibility of industrialization.
每年都有大量的手机废弃物。由于传统方法的缺点，有必要寻找更环保、更经济的生物过程来从电子废物中回收金属。真菌提供大量的有机酸并溶解金属，但在培养基中使用蔗糖并不经济。本文的主要目的是找到一种合适的替代碳源，而不是蔗糖，用于真菌浸出手机印刷电路板（PCB）中的 Ni 和 Cu，使用青霉菌（Penicillium simplicissimum）。选择了四种碳源（包括蔗糖、奶酪乳清、糖和甘蔗糖蜜）。还通过响应面法（RSM）对所有碳源的接种物的 pH 值和孢子数进行了优化。结果表明，同时实现 Cu 和 Ni 的最大回收是不可能的。对于 Cu 的回收，糖是比蔗糖更经济和简单的培养基。在 pH 值为 7、3.3×10 个孢子和糖的条件下，Cu 的最大回收率（90%）。在 pH 值为 2 和 10 个孢子的条件下，Ni 的回收率（89%）最高。结果证明非传统碳源可提高生物浸出效率和工业化的可能性。
