Separation of Chlorinated Plastics and Immobilization of Heavy Metals in Hazardous Automotive Shredder Residue

Authors: Srinivasa Reddy Mallampati, Chi-Hyeon Lee, Nguyen Thi Thanh Truc, Byeong-Kyu Lee

Abstract:

In the present study, feasibility of the selective surface hydrophilization of polyvinyl chloride (PVC) by microwave treatment was evaluated to facilitate the separation from automotive shredder residue (ASR), by the froth flotation. The combination of 60 sec microwave treatment with PAC, a sharp and significant decrease about 16.5° contact angle of PVC was observed in ASR plastic compared with other plastics. The microwave treatment with the addition of PAC resulted in a synergetic effect for the froth flotation, which may be a result of the 90% selective separation of PVC from ASR plastics, with 82% purity. While, simple mixing with a nanometallic Ca/CaO/PO4 dispersion mixture immobilized 95-100% of heavy metals in ASR soil/residues. The quantity of heavy metals leached from thermal residues after treatment by nanometallic Ca/CaO/PO4 was lower than the Korean standard regulatory limit for hazardous waste landfills. Microwave treatment can be a simple and effective method for PVC separation from ASR plastics.

Keywords: Automotive shredder residue, microwave treatment, chlorinated plastics, separation, heavy metals, Immobilization, separation.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1110557

References:

[1] Solving the E-Waste Problem (StEP) Initiative, StEP E-waste World Map. (2014) http://www.step-initiative.org/step-e-waste-worldmap. html
[2] C. P. Balde, R. Kuehr, K. Blumenthal, S. Fondeur Gill, M. Kern, P. Micheli, E. Magpantay, J. Huisman (2015), E-waste statistics: Guidelines on classifications, reporting and indicators. United Nations University, IAS - SCYCLE, Bonn, Germany. (2015)
[3] Y. C. Jang, Waste electrical and electronic equipment (WEEE) management in Korea: generation, collection, recycling systems, J. Mater. Cycles Waste. Manag. 12 (2010) 283–294.
[4] Korea Ministry of Environment (Korea MOE) (2007) The Act on the Resource Recycling of Waste Electrical Electronic Equipment (WEEE) and End-of-life Vehicles (ELVs), The Ministry, Gwacheon.
[5] T. Takoungsakdakun, S. Pongstabodee, Separation of mixed post-consumer PET-POM-PVC plastic waste using selective flotation, Sep. Purif. Technol. 54 (2007) 248-252.
[6] S. Moriwaki, M. Machida, H. Tatsumoto, Y. Otsubo, M. Aikawa, T. Ogura. Dehydrochlorination of poly(vinyl chloride) by microwave irradiation. Applied Thermal Engineering 26 (2006) 745–750.
[7] M. Ito, K. Ushida, N. Nakao, N. Kikuchi, R. Nozaki, K. Asai, M. Washio. Dechlorination of poly (vinyl chloride) by microwave irradiation I:A simple examination using a commercial microwave oven. Polymer Degradation and Stability 91 (2006) 1694e1700.
[8] Bacalogulu R., Fish MH, Kaufhold J., Sander H. J. In: Zweifel H., editor. Plastics additives handbook. Cincinnati: Hanser Gardner Publications; 2001. p. 427 (chapter 3).
[9] D. A. Jones, T. P. Lelyveld, S. D. Mavrofidis, S. W. Kingman, N. J. Miles. Microwave heating applications in environmental engineering—a review. Resources, Conservation and Recycling 34 (2002) 75–90.
[10] J. A. Menéndez, A. Arenillas, B. Fidalgo, Y. Fernández, L. Zubizarreta, E. G. Calvo, J. M. Bermúdez. Microwave heating processes involving carbon materials, Fuel Processing Technology 91 (2010) 1–8.
[11] Y. Mitoma, S. R. Mallampati, H. Miyata, M. Kakeda, Decomposition of Polychlorinated Biphenyls in Soil With a Dispersion Mixture of Metallic Calcium and Calcium Oxide, Arch. Environ. Contam. Toxicol. 64 (2013) 180–186.
[12] Mallampati S. R., Mitoma Y., Okuda T., Sakita S., Kakeda M. (2012a) High immobilization of soil cesium using ball-milling with nano-metallic Ca/CaO/NaH2PO4: implications for the remediation of radioactive soils. Environ Chem Lett 10:201–207.
[13] Mallampati, S. R., T. Okuda, Y. Mitoma, S. Sakita, and M. Kakeda. 2012b. Enhanced heavy metal immobilization in soil by grinding with addition of 595 nanometallic Ca/CaO dispersion mixture. Chemosphere 89:717–723. doi:10.1016/j.chemosphere.2012.06.030.
[14] M. S. Reddy, T. Okuda, K. Kurose, T. Y. Tsai, S. Nakai, W. Nishijima, M. Okada, Surface ozonation of polyvinyl chloride for its separation from waste plastic mixture by froth flotation, J. Mater. Cycles. Waste., 12 (2010) 326-331.
[15] T. Okuda, K. Kurose, W. Nishijima, M. Okada, Separation of polyvinyl chloride from plastic mixture by froth flotation after surface modification with ozone, Ozone-Sci. Eng., 29 (2007) 373-377.
[16] Regulatory of waste management (Ministry of Environment Report, Seoul, Republic of Korea) (2000) 2-5.