ANALYSIS OF TOXIC AND HARMFUL METALS CONTENT AND ECOLOGICAL RISK IN WASTE LCD PANELS

WANG Yu; ZHUANG Xu-ning; MAO Shao-hua; GU Wei-hua; BAI Jian-feng

doi:10.13205/j.hjgc.202001018

Volume 38 Issue 1

Mar. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(1): 117-121

WANG Yu, ZHUANG Xu-ning, MAO Shao-hua, GU Wei-hua, BAI Jian-feng. ANALYSIS OF TOXIC AND HARMFUL METALS CONTENT AND ECOLOGICAL RISK IN WASTE LCD PANELS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(1): 117-121. doi: 10.13205/j.hjgc.202001018

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WANG Yu, ZHUANG Xu-ning, MAO Shao-hua, GU Wei-hua, BAI Jian-feng. ANALYSIS OF TOXIC AND HARMFUL METALS CONTENT AND ECOLOGICAL RISK IN WASTE LCD PANELS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(1): 117-121. doi: 10.13205/j.hjgc.202001018

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ANALYSIS OF TOXIC AND HARMFUL METALS CONTENT AND ECOLOGICAL RISK IN WASTE LCD PANELS

doi: 10.13205/j.hjgc.202001018

1. School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai 201209, China;
2. Research Center of Resource Recycling Science and Engineering, Shanghai Polytechnic University, Shanghai 201209, China;
3. Shanghai Collaborative Innovation Centre for Waste Electrical and Electronic Equipment Recycling, Shanghai Polytechnic University, Shanghai 201209, China

Received Date: 2019-02-20

Abstract

Abstract

Focusing on the environmental risks of heavy metals contained in discarded LCD panels, the contents of nine major toxic and harmful metals in three typical LCD panels, desktop computer display, notebooks and liquid crystal television were analyzed. Furthermore, the occurrence forms, ecological risks and leaching toxicity of metals were analyzed and evaluated by BCR sequential extraction method, individual contamination factors method (ICF) and TCLP standard toxicity leaching method respectively. The results showed that As had the highest concentration in LCD panel in the experimental range, which was 1.8×10³ mg/kg, followed by Zn, Cr, Sn, Ni, In, Cu and Cd, with their concentration ranging from 26.20~413.00 mg/kg, and Pb was not detected. In LCD panels, As, Cd, Sn, Cr, Ni and Zn mainly existed in residual form, with a lower ecological risk level. In and Cu took the reducible state as their main existing form, with higher ecological risk level. As, Ni and Zn had certain leaching toxicity risks, in which the leaching concentration of As and Ni exceeded the limit of toxicological index of Rank Ⅲ of Groundwater Quality Standard (GB/T 14848—2017), and the leaching concentration of Zn exceeded the limit of general chemical index of rank Ⅲ of GB/T 14848—2017.
- LCD panel,
- heavy metals,
- occurrence form,
- environmental risks,
- leaching toxicity

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References(30)

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