Chen Mengjun, Jiang Pengfei, Chen Haiyan, Ogunseitan Oladele A, Li Yungui
a Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education , Southwest University of Science and Technology , Mianyang , People's Republic of China.
J Air Waste Manag Assoc. 2015 Jun;65(6):743-50. doi: 10.1080/10962247.2015.1016634.
The plasma display panel (PDP) is rapidly becoming obsolete, contributing in large amounts to the electronic waste stream. In order to assess the potential for environmental pollution due to hazardous metals leached from PDP glass, standardized leaching procedures, chemical speciation assessments, and bioavailability tests were conducted. According to the Toxicity Characteristic Leaching Procedure (TCLP), arsenic in back glass was present at 4.46 ± 0.22 mg/L, close to its regulation limit of 5 mg/L. Zn is not available in the TCLP, but its TCLP leaching concentration in back glass is 102.96 ± 5.34 mg/L. This is because more than 90% of Zn is in the soluble and exchangeable and carbonate fraction. We did not detect significant levels of Ag, Ba, or Cu in the TCLP leachate, and the main fraction of Ag and Ba is residual, more than 95%, while the fraction distribution of Cu changes SEP by SEP. Ethylenediamine tetraacetic acid (EDTA)- and diethylenetriamine pentaacetic acid (DTPA)-extractable Ag, As, Ba, Cu, Zn, and Ni indicate a lower biohazards potential. These results show that, according to the EPA regulations, PDP glass may not be classified as hazardous waste because none of the metals exceeded their thresholds in PDP leachate. However, the concentrations of As and Zn should be lowered in the manufacturing process and finished product to avoid potential pollution problems.
The plasma display panel is rapidly becoming obsolete because of the liquid crystal display. In this study, the leachability of heavy metals contained in the waste plasma display panel glass was first examined by standardized leaching tests, typical chemical speciation assessments, and bioavailability tests, providing fundamental data for waste PDP glass recovery, recycling, and reuse.
等离子体显示板（PDP）正在迅速过时，成为电子废物流的大量来源。为了评估PDP玻璃中浸出的有害金属造成环境污染的可能性，进行了标准化浸出程序、化学形态评估和生物可利用性测试。根据毒性特征浸出程序（TCLP），后玻璃中的砷含量为4.46±0.22毫克/升，接近其5毫克/升的监管限值。锌不在TCLP的检测范围内，但其在后玻璃中的TCLP浸出浓度为102.96±5.34毫克/升。这是因为超过90%的锌处于可溶、可交换和碳酸盐部分。我们在TCLP浸出液中未检测到显著水平的银、钡或铜，银和钡的主要部分是残留的，超过95%，而铜的部分分布因SEP而异。乙二胺四乙酸（EDTA）和二乙烯三胺五乙酸（DTPA）可提取的银、砷、钡、铜、锌和镍表明生物危害潜力较低。这些结果表明，根据美国环境保护局（EPA）的规定，PDP玻璃可能不会被归类为危险废物，因为没有一种金属在PDP浸出液中超过其阈值。然而，在制造过程和成品中应降低砷和锌的浓度，以避免潜在的污染问题。
由于液晶显示器，等离子体显示板正在迅速过时。在本研究中，首先通过标准化浸出试验、典型化学形态评估和生物可利用性测试，研究了废弃等离子体显示板玻璃中所含重金属的浸出性，为废弃PDP玻璃的回收、再循环和再利用提供了基础数据。
