• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Biodegradation of dihydroxybenzenes (hydroquinone, catechol and resorcinol) by granules enriched with phenol in an aerobic granular sequencing batch reactor.
【24h】

Biodegradation of dihydroxybenzenes (hydroquinone, catechol and resorcinol) by granules enriched with phenol in an aerobic granular sequencing batch reactor.

机译：在好氧颗粒测序批处理反应器中，富含苯酚的颗粒对二羟基苯（对苯二酚，邻苯二酚和间苯二酚）进行生物降解。

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

During the last 20 years, intensive research in the field of wastewater treatment has been conducted to focus on aerobic granular sludge because of its efficiency for water purification. Previous researchers have studied the characterization of the granules and the granular sequencing batch reactor's (GSBR) applications. However, there is little research done on how enrichment with one compound influences the biodegradation of structurally similar compounds. In this research, phenol-enrichment was investigated as a potential method to improve the biodegradation of the three dihydroxybenzenes (hydroquinone, catechol and resorcinol), which are structurally similar to phenol and even share biodegradation pathway reactions. The objectives of this research were: (1) Cultivate stable aerobic phenol-degrading granular sludge using acetate-fed granules as microbial seed; (2) Compare the removal over one anaerobic/aerobic cycle of the three dihydroxybenzene compounds (hydroquinone, catechol and resorcinol) added individually by the phenol-enriched acetate-fed granules (PAFG) reactor and the non-phenol-enriched acetate-fed granules (NPAFG) reactor (control); (3) Compare the removal of phenol and the three dihydroxybenzene compounds (hydroquinone, catechol and resorcinol) added individually during the anaerobic phases and the aerobic phases; (4) Compare the removal of the dihydroxybenzenes when they are provided as a mixture to the PAFG and the NPAFG reactors; (5) Discuss implications for GSBR operation to treat aromatic chemicals. Two reactors, the PAFG reactor and the NPAFG (control) reactor, were created and used in this project. GSBRs are thought to require both anaerobic and aerobic phases (and phosphorous-accumulating organisms) in order to form granules and there are anaerobic pathways for degradation of phenolics, so to determine the possible significance of the anaerobic degradation one GSBR cycle included both anaerobic and aerobic phases in this study. Stable aerobic acetate-degrading granules were cultivated first using acetate-containing synthetic wastewater of 600 mg COD/L (chemical oxygen demand), resulting in two identical reactors, both with more than 90% acetate-removal and a 6-hour hydraulic retention time (HRT). Then the PAFG reactor was fed synthetic wastewater containing acetate and phenol at a total of 600 mg COD/L, while the NPAFG reactor was still fed with acetate-containing synthetic wastewater at 600 mg COD/L. In the PAFG reactor, phenol concentrations were gradually increased from 10 mg/L to 100 mg/L (246 mg COD/L). Removal tests of three dihydroxybenzenes were conducted individually at 25 mg/L, 50 mg/L, 75 mg/L and 100 mg/L and the removal test of a mixture of the four compounds stated above was conducted at 50 mg/L each. Samples from degradation experiments with phenol and dihydroxybenzenes were analyzed and quantified with high-performance liquid chromatography using a UV detector (HPLC-UV) to analyze phenol and the three dihydroxybenzenes and NanoDrop to analyze COD concentrations via colorimetric COD assays. After phenol-enrichment, in the PAFG reactor phenol removal percentages were more than 90% in a single cycle. Overall, of the three dihydroxybenzenes tested, hydroquinone was removed most effectively (80% -- 90% in a single cycle) in both the PAFG and the NPAFG reactors at all the four concentrations. There was 20% increase of the catechol removal in the PAFG reactor (80% removal on average) compared with the NPAFG reactor (60% removal on average). Resorcinol removal percentages were lowest overall but they showed the greatest improvement after phenol-enrichment. In the NPAFG reactor, only 20% of resorcinol was removed during one GSBR cycle, while in the PAFG reactor, around 60% of resorcinol was removed. During one cycle, most of the aromatic compounds were degraded in the aerobic phase (most rapidly during the first 40 minutes of the aerobic phase). The observed aerobic degradations of phenol, hydroquinone and catechol were consistent with several kinetics models (first-order, Monod or Haldane kinetics) and the best model cannot be chosen without follow-up studies with many more data points and a wider range of concentrations tested. Together, data from these experiments demonstrated that phenol-enrichment of GSBR granular sludge can improve the biodegradation of the three dihydroxybenzenes (hydroquinone, catechol and resorcinol), which can be potentially used in wastewater treatment.
机译：在过去的20年中，由于废水的净化效率很高，因此在废水处理领域进行了深入研究以关注好氧颗粒污泥。以前的研究人员已经研究了颗粒的表征和颗粒测序间歇反应器（GSBR）的应用。但是，关于一种化合物的富集如何影响结构相似的化合物的生物降解的研究很少。在这项研究中，研究了富集苯酚作为改善三种二羟基苯（对苯二酚，邻苯二酚和间苯二酚）的生物降解的潜在方法，它们在结构上与苯酚相似，甚至具有生物降解途径反应。本研究的目的是：（1）以醋酸盐颗粒作为微生物种子，培养稳定的需氧降解苯酚颗粒污泥。 （2）比较在一个厌氧/好氧循环中，分别由富酚醋酸盐颗粒（PAFG）反应器和非富酚醋酸盐颗粒中添加的三种二羟基苯化合物（对苯二酚，邻苯二酚和间苯二酚）的去除率。 （NPAFG）反应堆（对照）； （3）比较在厌氧阶段和好氧阶段分别添加的苯酚和三种二羟基苯化合物（对苯二酚，儿茶酚和间苯二酚）的去除率； （4）比较将二羟基苯作为混合物提供给PAFG和NPAFG反应器的去除情况； （5）讨论对GSBR处理芳族化学品的影响。创建了两个反应堆，分别为PAFG反应堆和NPAFG（控制）反应堆，并在该项目中使用。 GSBR被认为既需要厌氧相又需要好氧相（以及磷积累的生物体）才能形成颗粒，并且存在厌氧降解酚类的途径，因此为了确定厌氧降解的可能意义，一个GSBR循环包括厌氧和好氧本研究的各个阶段。首先使用600 mg COD / L（化学需氧量）的含乙酸盐的合成废水培养稳定的需氧乙酸盐降解颗粒，形成两个相同的反应器，去除率均超过90％，水力停留时间为6小时（HRT）。然后，向PAFG反应器进料含乙酸盐和苯酚的合成废水，总量为600 mg COD / L，而NPAFG反应器仍进给含乙酸盐和苯酚的合成废水，含量为600 mg COD / L。在PAFG反应器中，苯酚浓度从10 mg / L逐渐增加到100 mg / L（246 mg COD / L）。分别以25 mg / L，50 mg / L，75 mg / L和100 mg / L进行三种二羟基苯的去除测试，并分别以50 mg / L进行上述四种化合物的混合物的去除测试。使用紫外检测器（HPLC-UV）通过高效液相色谱分析和定量苯酚和二羟基苯降解实验的样品，以分析苯酚和三种二羟基苯，而NanoDrop通过比色COD分析来分析COD浓度。苯酚富集后，在PAFG反应器中，单个循环中的苯酚去除率超过90％。总体而言，在所有四种浓度下，在PAFG和NPAFG反应器中，最有效地去除氢醌（一次循环中80％-90％）的三种对苯二酚。与NPAFG反应器（平均去除60％）相比，PAFG反应器中的邻苯二酚去除增加了20％（平均去除80％）。总体而言，间苯二酚的去除百分率最低，但苯酚富集后它们显示出最大的改善。在NPAFG反应器中，在一个GSBR循环中仅去除了20％的间苯二酚，而在PAFG反应器中，去除了约60％的间苯二酚。在一个循环中，大多数芳香族化合物在好氧阶段被降解（在有氧阶段的前40分钟内降解最快）。观察到的苯酚，对苯二酚和邻苯二酚的有氧降解与几种动力学模型（一阶动力学，Monod或Haldane动力学）一致，如果没有后续研究以及更多的数据点和更大范围的浓度测试，则无法选择最佳模型。总之，这些实验的数据表明，GSBR颗粒污泥的苯酚富集可以改善三种二羟基苯（对苯二酚，邻苯二酚和间苯二酚）的生物降解能力，这可潜在地用于废水处理。

著录项

  • 作者

    Zhao, Jing.;

  • 作者单位

    Cornell University.;

  • 授予单位 Cornell University.;
  • 学科 Environmental engineering.
  • 学位 M.S.
  • 年度 2017
  • 页码 105 p.
  • 总页数 105
  • 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