• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Investigation of pyrolysis and electrokinetics as remediation techniques for the treatment of CCA-treated wood waste
【24h】

Investigation of pyrolysis and electrokinetics as remediation techniques for the treatment of CCA-treated wood waste

机译：热解和电动学作为处理CCA处理的木材废料的修复技术的研究

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Increasing volumes of Chromated Copper Arsenate (CCA) treated wood materials are being removed from service, either as a result of reaching the end of their service life or being replaced with non-treated wood materials. These materials, while not regulated as hazardous wastes, have the potential to leach toxic metals into the environment. Incineration and landfilling are not ideal disposal methods as incineration could result in the volatilization of carcinogenic arsenic and chromium, while landfilling requires the waste to be sorted and placed in appropriately lined landfills to prevent contaminant release. Viable disposal methods must be considered to manage the significant waste stream of CCA-treated wood.;This study investigates pyrolysis and electrokinetics (EK) as possible remediation techniques for the treatment of CCA-treated wood waste. A unique bench pyrolysis reactor was designed and optimized over three pyrolysis temperatures for retention of CCA metals within the char and bio-oil pyrolysis products. A batch pyrolysis system was constructed to produce large quantities of pyrolysis char for use in EK experiments. Mass balances were performed across both bench and batch pyrolysis systems, with metal distribution trends ascertained. EK experiments were performed on the char generated during batch pyrolysis as well as CCA-treated wood waste to evaluate the efficiency of coupling the two technologies. These EK studies were performed using pH regulation at the cathode and applying constant current. Distribution of the CCA metals post-EK experiment was determined and removal efficiencies were calculated. The mobility of the CCA metals was evaluated during all phases of this investigation using Toxicity Characteristic Leaching Procedure (TCLP), Synthetic Precipitation Leaching Procedure (SPLP), and Deionized Water Leaches to determine the likelihood of metal leaching under different environmental conditions.
机译：由于使用年限已达到终点，或已用未经处理的木质材料代替，因此越来越多的经铬酸砷酸铜（CCA）处理的木质材料已停止使用。这些材料虽然未作为危险废物进行管理，但有可能将有毒金属浸出到环境中。焚化和掩埋不是理想的处置方法，因为焚化可能导致致癌性砷和铬挥发，而掩埋则需要将废物分类并放置在有衬里的填埋场中，以防止污染物释放。必须考虑采用可行的处置方法来管理经CCA处理的木材的大量废物流。；本研究调查了热解和电动学（EK）作为处理经CCA处理的木材废物的可能补救技术。设计了一个独特的台式热解反应器，并在三个热解温度上进行了优化，以将CCA金属保留在焦油和生物油热解产物中。构建了批量热解系统，以生产大量的热解炭，用于EK实验。在台式和间歇式热解系统中均进行了质量平衡，并确定了金属分布趋势。对分批热解过程中产生的焦炭以及经CCA处理的木材废料进行EK实验，以评估两种技术结合的效率。这些EK研究是使用阴极的pH调节并施加恒定电流进行的。确定了CCA金属在EK后的分布，并计算了去除效率。在本研究的所有阶段，均使用毒性特征浸出程序（TCLP），合成沉淀浸出程序（SPLP）和去离子水浸出法评估了CCA金属的迁移率，以确定在不同环境条件下金属浸出的可能性。

著录项

  • 作者

    Parker, Amy Marie.;

  • 作者单位

    Mississippi State University.;

  • 授予单位 Mississippi State University.;
  • 学科 Chemical engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 270 p.
  • 总页数 270
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号