Kim Daeik, Quinlan Michael, Yen Teh Fu
Sonny Astani Department of Civil and Environmental Engineering, Viterbi School of Engineering, University of Southern California, KAP 210, 3620 South Vermont Avenue, Los Angeles, CA 90089, USA.
Waste Manag. 2009 Jan;29(1):321-8. doi: 10.1016/j.wasman.2008.01.022. Epub 2008 Apr 11.
Discarded computer monitors and television sets are identified as hazardous materials due to the high content of lead in their cathode ray tubes (CRTs). Over 98% of lead is found in CRT glass. More than 75% of obsolete electronics including TV and CRT monitors are in storage because appropriate e-waste management and remediation technologies are insufficient. Already an e-waste tsunami is starting to roll across the US and the whole world. Thus, a new technology was developed as an alternative to current disposal methods; this method uses a concrete composite crosslinked with minute amounts of biopolymers and a crosslinking agent. Commercially available microbial biopolymers of xanthan gum and guar gum were used to encapsulate CRT wastes, reducing Pb leachability as measured by standard USEPA methods. In this investigation, the synergistic effect of the crosslinking reaction was observed through blending two different biopolymers or adding a crosslinking agent in biopolymer solution. This CRT-biopolymer-concrete (CBC) composite showed higher compressive strength than the standard concrete and a considerable decrease in lead leachability.
废弃的电脑显示器和电视机因其阴极射线管（CRT）中铅含量高而被认定为有害物质。超过98%的铅存在于阴极射线管玻璃中。包括电视和阴极射线管显示器在内，超过75%的过时电子产品被储存起来，原因是适当的电子垃圾管理和修复技术不足。一场电子垃圾海啸已经开始席卷美国乃至全球。因此，人们开发了一种新技术来替代当前的处置方法；这种方法使用一种与微量生物聚合物和交联剂交联的混凝土复合材料。市售的微生物生物聚合物黄原胶和瓜尔胶被用于封装阴极射线管废物，按照美国环境保护局（USEPA）的标准方法测量，可降低铅的浸出性。在这项研究中，通过混合两种不同的生物聚合物或在生物聚合物溶液中添加交联剂，观察到了交联反应的协同效应。这种阴极射线管-生物聚合物-混凝土（CBC）复合材料显示出比标准混凝土更高的抗压强度，并且铅的浸出性显著降低。
