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首页> 外文学位 >Examining granular activated carbon adsorption of organic contaminants from water: Endocrine disruptors/pharmaceuticals, methyl tert-butyl ether, and benzene.
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Examining granular activated carbon adsorption of organic contaminants from water: Endocrine disruptors/pharmaceuticals, methyl tert-butyl ether, and benzene.

机译：检查颗粒状活性炭对水中有机污染物的吸附：内分泌干扰物/药物，甲基叔丁基醚和苯。

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摘要

Granular activated carbon (GAC) is a widely used and efficient method for removing organic contaminants from drinking water. The work herein examines the use of GAC for removing three contaminants of interest: (i) endocrine disruptors, pharmaceuticals, and personal care products; (ii) methyl tert-butyl ether (MTBE); and (iii) benzene. Each of these contaminants occurs in drinking water sources between part-per-billion (ppb, mug/L) and part-per-trillion (ppt, ng/L) concentrations.;With detection limits at part-per-trillion (ppt) levels, endocrine-disrupting compounds (EDCs) and pharmaceuticals and personal care products (PPCPs) are now identifiable in many drinking waters. This study assessed sorption of 29 EDCs/PPCPs at ppt concentrations using GAC rapid small-scale column tests (RSSCTs). To better understand the adsorption behavior of EDCs/PPCPs at ppt levels, a quantitative structure-activity relationship (QSAR) model was developed using the observed bed volumes to breakthrough, carbon properties, and a defined set of molecular properties and descriptors.;As a relatively water-soluble gasoline additive, MTBE is found in many source waters. The removal of MTBE in RSSCTs was appraised and compared to GAC pore size and empty-bed contact time (EBCT) to determine the influences of these parameters. The performance of seven hydrophobic GACs at three small-scale EBCTs was statistically compared to the pore volume distributions of the GACs. By limiting access to micropores, mesopore volume was shown to be the most controlling factor of the analyzed parameters for RSSCT capacity. The observed mass transfer rate increased with micropore volume and decrease with mesopore volume.;Due to shipping of gasoline on the Ohio River, the Greater Cincinnati Water Works can be heavily impacted by spills, including relatively soluble benzene. The objective of the work herein was to improve the regeneration protocol for benzene removal from the influent Cincinnati water. RSSCTs for benzene removal were performed using a virgin Filtrasorb 400 (F400) GAC, a GAC regenerated at the Greater Cincinnati Water Works (GCWW), three GACs regenerated at Penn State University, and three pilot-scale GACs produced at the GCWW. Spent GAC was acquired from the GCWW and regenerated at PSU via protocols varying the use of steam and treatment time in a thermogravimetric analyzer. These lab-scale regeneration protocols were then applied at the pilot-scale using a reactor at the GCWW. Pilot-scale regeneration produced a GAC with improved benzene removal as compared to the standard regenerated GAC.
机译：颗粒活性炭（GAC）是一种用于去除饮用水中有机污染物的有效方法。本文的工作检验了GAC在去除三种感兴趣的污染物方面的用途：（i）内分泌干扰物，药物和个人护理产品； （ii）甲基叔丁基醚（MTBE）； （iii）苯。这些污染物中的每一种都发生在饮用水源中，其浓度在十亿分之一（ppb，杯子/升）和十亿分之一（ppt，ng / L）浓度之间;检出限在十亿分之一（ppt）之间在许多饮用水中，现在可以确定其浓度，干扰内分泌的化合物（EDC）以及药品和个人护理产品（PPCP）的水平。这项研究使用GAC快速小规模色谱柱试验（RSSCT）评估了ppt浓度下29种EDC / PPCP的吸附。为了更好地了解PDC上EDC / PPCP的吸附行为，建立了定量结构-活性关系（QSAR）模型，该模型使用了观察到的突破床层体积，碳性质以及一组定义的分子性质和描述符。相对水溶性的汽油添加剂，MTBE存在于许多水源水中。评估了RSSCT中MTBE的去除率，并将其与GAC孔径和空床接触时间（EBCT）进行比较，以确定这些参数的影响。统计地比较了七个疏水性GAC在三个小规模EBCT上的性能与GAC的孔体积分布。通过限制进入微孔，中孔体积被证明是RSSCT容量分析参数的最大控制因素。观察到的传质速率随微孔体积的增加而增加，而随中孔体积的变化而减小。；由于汽油在俄亥俄河上的运输，大辛辛那提水厂会受到包括相对可溶苯在内的泄漏物的严重影响。本文工作的目的是改善从辛辛那提水中去除苯的再生方案。使用纯净的Filtrasorb 400（F400）GAC，在大辛辛那提水厂（GCWW）再生的GAC，在宾夕法尼亚州立大学再生的三个GAC和在GCWW生产的三个中试规模的GAC进行了去除苯的RSSCT。用过的GAC是从GCWW获得的，并通过改变热重分析仪中蒸汽的使用和处理时间的规程在PSU进行再生。然后，使用GCWW的反应器将这些实验室规模的再生方案应用于中试规模。与标准再生GAC相比，中试再生产生的GAC具有改善的苯去除率。

著录项

  • 作者

    Redding, Adam Michael.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 126 p.
  • 总页数 126
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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