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首页> 外文学位 >Formaldehyde Sorption and Biological Activity in Porous Media.
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Formaldehyde Sorption and Biological Activity in Porous Media.

机译：多孔介质中的甲醛吸附和生物活性。

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摘要

Formaldehyde is a common indoor air pollutant, which poses negative health effects to building occupants, and it is found in commercial, residential, and occupational spaces. Its removal is usually achieved by augmenting ventilation rates, an approach that is energy-intensive. Formaldehyde is a volatile organic compound (VOC) that is very hydrophilic and can be sorbed onto organic materials and porous media sorbents. The objective of the research is to quantify the rate of formaldehyde sorption on several porous media and determine if microbial degradation could occur in these media. Four porous media (Growstone, Hydroton expanded clay, coco coir, and activated carbon) were tested and found to have average sorption potentials of 0.241, 0.572, 42.36, and 174.13 mg/g media, respectively. In addition, microbial communities extracted from several soils and these porous media were tested for their potential to survive on various levels of formaldehyde. One soil, thought to be exposed to formaldehyde, produced microbes able to survive on LB agar medium containing 20 mM (736.7 ppm) formaldehyde, but these CFU's were absent when the same soil was tested nine months later. Neat (not inoculated with microbes) porous media were also tested for their formaldehyde-resistant microbial communities before and after exposure to gaseous formaldehyde. Activated carbon, Growstone, and Hydroton expanded clay were largely sterile both before and after exposure. Coco coir exhibited colony growth at 1 mM formaldehyde before exposure and a 156.7% increase in colony counts on 1 mM plates after exposure to gaseous formaldehyde. The use of low-cost porous media such as coco coir should be further investigated as an alternative for the removal and degradation of formaldehyde in indoor environments.
机译：甲醛是一种常见的室内空气污染物，会对建筑居民的健康产生负面影响，并且存在于商业，住宅和职业场所。通常通过增加通风量来实现去除，这是一种能耗大的方法。甲醛是一种非常亲水的挥发性有机化合物（VOC），可以吸附到有机材料和多孔介质吸附剂上。该研究的目的是量化甲醛在几种多孔介质上的吸附速率，并确定这些介质中是否可能发生微生物降解。测试了四种多孔介质（Growstone，Hydroton膨胀粘土，椰壳纤维和活性炭），发现它们的平均吸附势分别为0.241、0.572、42.36和174.13 mg / g。此外，还测试了从几种土壤中提取的微生物群落以及这些多孔介质在各种甲醛水平下生存的潜力。一种土壤被认为暴露于甲醛，产生的微生物能够在含有20 mM（736.7 ppm）甲醛的LB琼脂培养基上存活，但是在9个月后测试同一土壤时，这些CFU却不存在。还测试了纯净（未接种微生物）的多孔介质在暴露于气态甲醛之前和之后的耐甲醛微生物群落。活性炭，Growstone和Hydroton膨胀黏土在接触前后均基本无菌。在暴露于气态甲醛后，可可椰皮在1 mM甲醛下显示菌落生长，在1 mM平板上菌落计数增加156.7％。应该进一步研究使用低成本多孔介质（如椰壳纤维）作为室内环境中甲醛的去除和降解的替代方法。

著录项

  • 作者

    Wrobetz, Anne Victoria.;

  • 作者单位

    University of Colorado at Boulder.;

  • 授予单位 University of Colorado at Boulder.;
  • 学科 Environmental engineering.
  • 学位 M.S.
  • 年度 2015
  • 页码 107 p.
  • 总页数 107
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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