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首页> 外文学位 >Study of alfalfa phytofiltration technology to clean heavy metal contaminated waters.
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Study of alfalfa phytofiltration technology to clean heavy metal contaminated waters.

机译：紫花苜蓿植物过滤技术用于清洁重金属污染水的研究。

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摘要

Heavy metal contamination of the environment has become a serious concern. Traditional methods which are currently used are costly and may prove prohibitive for some contaminated sites. Therefore, there is a need for the development of a cost effective remediation system for the removal and recovery of these contaminants. If a remediation system can be made that is profitable, more industries will clean their effluents and protect the environment and remediation of current sites could be achieved. The main objective of this project is to determine the ability of alfalfa biomass to bind different heavy metal ions under a variety of harsh conditions in order to develop an innovative filtration system using alfalfa for the economical removal of toxic heavy metal ions from contaminated waters in a recyclable form for industrial reuse.;Results of these studies have shown that alfalfa is not only effective at removing contaminants from waters, but also possesses the unique ability to allow for recovery of these contaminants in a usable form for industrial recycling. In addition, we have determined that high levels of calcium and magnesium which typically foul conventional commercial systems are do not greatly hinder the binding of some of the metal ions studied. Previously performed column experiments have proven that silica immobilized alfalfa has the capacity to be reused over twenty applications and still remain efficient and practical for the removal and recovery of copper ions from water. These results show that alfalfa is effective for removal of copper, cadmium, chromium, nickel, lead, and zinc from aqueous solutions. Even with mixed-metal containing solutions, the alfalfa phytofiltration system has shown remarkable metal recovery. Also, studies were performed to determine the heavy metal binding mechanism through chemical modification and X-ray absorption spectroscopy. Since silica-immobilized alfalfa is biodegradable it will not harm the environment. In addition, the alfalfa biomass has a unique ability to reduce gold(III) to gold(0) through a different binding mechanisms which could allow for the separation of gold ions from other heavy metals. These studies will be important in creating an economical system to clean heavy metals from contaminated waters and industrial effluents.
机译：重金属对环境的污染已成为严重问题。当前使用的传统方法价格昂贵，并且对于某些受污染的地点可能证明是禁止的。因此，需要开发一种成本有效的补救系统，以去除和回收这些污染物。如果可以建立一个有利可图的补救系统，那么更多的行业将清洁他们的污水并保护环境，并且可以实现现有场地的补救。该项目的主要目的是确定苜蓿生物量在各种苛刻条件下结合不同重金属离子的能力，以便开发一种利用苜蓿的创新过滤系统，以经济地从污染水中去除有毒重金属离子。这些研究的结果表明，苜蓿不仅可以有效地去除水体中的污染物，而且还具有独特的能力，可以以可用的形式回收这些污染物，用于工业循环利用。另外，我们已经确定，高含量的钙和镁（通常会破坏常规的商业体系）不会极大地阻碍某些研究的金属离子的结合。先前进行的色谱柱实验已证明，二氧化硅固定的紫花苜蓿具有可在20多种应用中重复使用的能力，并且仍然对于从水中去除和回收铜离子仍然有效而实用。这些结果表明，苜蓿可有效去除水溶液中的铜，镉，铬，镍，铅和锌。即使使用含有混合金属的溶液，紫花苜蓿的植物过滤系统也显示出显着的金属回收率。此外，还进行了研究以确定通过化学修饰和X射线吸收光谱法检测重金属的结合机理。由于二氧化硅固定的苜蓿具有生物可降解性，因此不会损害环境。此外，苜蓿生物质具有通过不同的结合机制将金（III）还原为金（0）的独特能力，该结合机制可将金离子与其他重金属分离。这些研究对于建立一种经济的系统以从污染的水和工业废水中清除重金属非常重要。

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  • 作者

    Tiemann, Kirk Jon.;

  • 作者单位

    The University of Texas at El Paso.;

  • 授予单位 The University of Texas at El Paso.;
  • 学科 Environmental science.;Biochemistry.;Environmental engineering.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 217 p.
  • 总页数 217
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 语言学;
  • 关键词

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