Cu biorecovery from electronic wastes without daily pH adjusting using Acidithiobacillus ferrooxidans

Arshadi, Mahdokht; Yaghmaei, Soheila; Mousavi, Seyyed Mohammad

Cu biorecovery from electronic wastes without daily pH adjusting using Acidithiobacillus ferrooxidans

Authors

M. Arshadi ¹

S. Yaghmaei ²

S. M. Mousavi ³

¹ Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran

² Chemical and Petroleum Engineering Department,Sharif University of Technology, Tehran, Iran

³ Chemical Engineering Department- Tarbiat Modares University-Tehran-Iran

Abstract

Electronic wastes are known as the most important solid wastes in 21th century. They are producing two or three time faster than other solid waste streams. Many researchers studied bioleaching of e-wastes using Acidithiobacillus ferrooxidans. The presence of alkaline metals cause e-wastes show an alkalinity nature. By adding e-wastes to the environment the pH of solution increases sensibly. Many researchers supposed the optimal pH range of A. ferrooxidans which is 1.5-2.5 as the optimal pH range to reach maximum recovery. So in the bioleaching process by daily pH adjusting in the range and using sensible amount of sulfuric acid, control the pH of solution about 2. In this research two same experiments, just the pH of one of them was adjusted daily, were done. In both experiments the environmental situation including pulp density of 15 g/l, inoculum 10% (v/v), the temperature of 30ºC, and shaking rate of 130 rpm was the same. For 25 days Cu recovery, bacterial count, pH, and Eh were examined. The results showed the maximum Cu recovery at the sample without pH adjusting was about 100% but at the sample with pH adjusting recovery was reduced to 90%. The bacterial count diagram showed the bacterium is well active in both experiments. To maximize recovery, reducing acid consumption, and increasing process economy there is no need to adjust the pH of solution.

Keywords

Electronic waste

Bioleaching

pH adjustment

Acidithiobacillus ferrooxidans

Cu recovery

Subjects

Biomedical Enginireeng

[1] Rastegar S.O., Bioleaching of Valuable Metal from Power Plant Residue, PhD Thesis, Iran - Tarbiat Modares University, March 2016.
[2] Hudec M.A.R., Sodhi M. and Goglia-Arora D., Biorecovery of Metals from Electronic Waste. 7th Latin American and Caribben Conference for Engineering and Thechnology San Cristobal, Venezuela, 2009.
[3] Pradhan J.k. and Kumar S., Metals Bioleaching from Electronic Waste by Chromobacterium Violaceum and Pseudomonads sp, Waste Managment Research, 30, 1151-1159, 2012.
[4] Ilyas S., Anwar M.A., Niazi S.B. and Afzal Ghauri M., Bioleaching of Metals from Electronic Scrap by Moderately Thermophilic Acidophilic Bacteria, Hydrometallurgy, 88 (1–4), 180-188, 2007.
[5] Pant D., Joshi D., Upreti M.K. and Kotnala R.K,. Chemical and Biological Extraction of Metals Present in E-Waste: A Hybrid Technology, Waste Management, 32, 979-990, 2012.
[6] Lee J.c. and Pandey B.D., Bio-Processing of Solid Wastes and Secondary Resources for Metal Extraction – A Review, Waste Management, 32(1), 3-18, 2012.
[7] Arshadi M. and Mousavi S.M., Simultaneous Recovery of Ni and Cu from Computer-Printed Circuit Boards Using Bioleaching: Statistical Evaluation and Optimization, Bioresource Technology, 174, 233-242, 2014.
[8] Mousavi S., Yaghmaei S., Vossoughi M., Jafari. A. and Hoseini S., Comparison of Bioleaching Ability of Two Native Mesophilic and Thermophilic Bacteria on Copper Recovery from Chalcopyrite Concentrate in an Airlift Bioreactor, Hydrometallurgy, 80, 139-144, 2005.
[9] Mishra D. and Rhee Y., Current Research Trends of Microbiological Leaching for Metal Recovery from Industrial Wastes, Current Research, Technology and Education Topics in Applied Microbiology and Microbial Biotechnology, 2010.
[10] Willner J., Influence of Physical and Chemical Factors on Biological Leaching Process of Copper from Printed Circuit Boards, Metalurgija, 52(2), 189-192, 2013.
[11] Mousavi S.M., Yaghmaei S., Vosoughi M., Roostaazad R., Jafari A., Ebrahimi M., Habibollahnia Chabok O. and Turunen I., The Effects of Fe (II) and Fe (III) Concentration and Initial pH on Microbial Leaching of Low-Grade Sphalerite Ore in a Column Reactor, Bioresource Technology, 99 (8), 2840-2845, 2008.
[12] Arshadi M. and Mousavi S.M., Multi-Objective Optimization of Heavy Metals Bioleaching from Discarded Mobile Phone PCBs: Simultaneous Cu and Ni Recovery using Acidithiobacillus Ferrooxidans, Separation and Purification Technology, 147, 210-219, 2015.
[13] Karwowska E., Andrzejewska-Morzuch D., Lebkowska M., Tabernacka A., Wojtkowska M., Telepko A. and Konarzewska A., Bioleaching of Metals from Printed Circuit Boards Supported with Surfactant-Producing Bacteria, Journal of Hazardous Materials, 264, 203-210, 2014.
[14] Liang G., Mo Y. and Zhou Q., Novel Strategies of Bioleaching Metals from Printed Circuit Boards (PCBs) in Mixed Cultivation of Two Acidophiles, Enzyme and Microbial Technology, 47(7), 322-326, 2010.
[15] Choi M.S., Cho K.S., Kim D.S. and Kim D.J., Microbial Recovery of Copper from Printed Circuit Boards of Waste Computer by Acidithiobacillus Ferrooxidans, Journal of Environmental Science and Health, Part A. 39(11-12), 2973-2982, 2004.
[16] Wang J., Bai J., Xu J. and Liang B., Bioleaching of Metals from Printed Wire Boards by Acidithiobacillus Ferrooxidans and Acidithiobacillus Thiooxidans and Their Mixture, Journal of Hazardous Materials, 172(2–3), 1100-1105, 2009.
[17] Brandl H., Microbial Leaching of Metals, Biotechnology, 10, 191-224, 2001.
[18] Arshadi M. and Mousavi S.M., Enhancement of Simultaneous Gold and Copper Extraction from Computer Printed Circuit Boards Using Bacillus Megaterium, Bioresource Technology, 175, 315-324, 2015.
[19] Arshadi M., Mousavi S.M. and Rasoulnia P., Enhancement of Simultaneous Gold and Copper Recovery from Discarded Mobile Phone PCBs Using Bacillus Megaterium: RSM Based Optimization of Effective Factors and Evaluation of Their Interactions, Waste Management, 57, 158-167, 2016.
[20] Brandl H., Bosshard R. and Wegmann M., Computer-Munching Microbes: Metal Leaching from Electronic Scrap by Bacteria and Fungi, Hydrometallurgy, 59 (2-3), 319-326, 2001.
[21] Arshadi M. and Mousavi S.M., Statistical Evaluation of Bioleaching of Mobile Phone and Computer Waste PCBs: A Comparative Study, Advanced Materials Research, China, 87-92, 2015.
[22] Mäkinen J., Bachér J., Kaartinen T., Wahlström M. and Salminen J., The Effect of Flotation and Parameters for Bioleaching of Printed Circuit Boards, Minerals Engineering, 75, 26-31, 2015.
[23] Bas A.D., Deveci H. and Yazici E.Y., Bioleaching of Copper from Low Grade Scrap TV Circuit Boards Using Mesophilic Bacteria, Hydrometallurgy, 138, 65-70, 2013.
[24] Arshadi M., Yaghmaei S. and Mousavi S.M., Enhanced Bioleaching of Metals from e-Waste: Study of Daily pH Adjustment, Submitted to Journal, 2018.
[25] Ilyas S., Ruan C., Bhatti H.N., Ghauri M.A. and Anwar M.A., Column Bioleaching of Metals from Electronic Scrap, Hydrometallurgy, 101 (3-4), 135-140, 2010.