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首页> 外文期刊>Journal of Environmental Science and Health >Biodegradation of airborne acetone/styrene mixtures in a bubble column reactor
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Biodegradation of airborne acetone/styrene mixtures in a bubble column reactor

机译：鼓泡塔反应器中机载丙酮/苯乙烯混合物的生物降解

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摘要

The ability of a bubble column reactor (BCR) to biodegrade a mixture of styrene and acetone vapors was evaluated to determine the factors limiting the process efficiency, with a particular emphasis on the presence of degradation intermediates and oxygen levels. The results obtained under varied loadings and ratios were matched with the dissolved oxygen levels and kinetics of oxygen mass transfer, which was assessed by determination of k(L)a coefficients. A 1.5-L laboratory-scale BCR was operated under a constant air flow of 1.0L.min(-1), using a defined mixed microbial population as a biocatalyst. Maximum values of elimination capacities/maximum overall specific degradation rates of 75.5 gC.m(-3).h(-1)/0.197 gC.gdw(-1).h(-1), 66.0 gC.m(-3).h(-1)/0.059 gC.gdw(-1).h(-1), and 45.8 gC.m(-3).h(-1)/0.027 gC.gdw(-1).h(-1) were observed for styrene/acetone 2:1, styrene-rich and acetone-rich mixtures, respectively, indicating significant substrate interactions and rate limitation by biological factors. The BCR removed both acetone and styrene near-quantitatively up to a relatively high organic load of 50g.m(-3).h(-1). From this point, the removal efficiencies declined under increasing loading rates, accompanied by a significant drop in the dissolved oxygen concentration, showing a process transition to oxygen-limited conditions. However, the relatively efficient pollutant removal from air continued, due to significant oxygen mass transfer, up to a threshold loading rate when the accumulation of acetone and degradation intermediates in the aqueous medium became significant. These observations demonstrate that oxygen availability is the limiting factor for efficient pollutant degradation and that accumulation of intermediates may serve as an indicator of oxygen limitation. Microbial (activated sludge) analyses revealed the presence of amoebae and active nematodes that were not affected by variations in operational conditions.
机译：评估了鼓泡塔反应器（BCR）对苯乙烯和丙酮蒸气混合物进行生物降解的能力，以确定限制工艺效率的因素，尤其着重于降解中间体和氧含量的存在。在不同的载荷和比例下获得的结果与溶解氧水平和氧传质动力学相匹配，这可以通过确定k（L）a系数来评估。 1.5升实验室规模的BCR在1.0 L.min（-1）的恒定气流下运行，使用定义的混合微生物种群作为生物催化剂。消除容量/最大总比降解率的最大值为75.5 gC.m（-3）.h（-1）/0.197 gC.gdw（-1）.h（-1），66.0 gC.m（-3） .h（-1）/0.059 gC.gdw（-1）.h（-1）和45.8 gC.m（-3）.h（-1）/0.027 gC.gdw（-1）.h（- 1）分别观察到苯乙烯/丙酮2：1，富含苯乙烯和富含丙酮的混合物，表明存在显着的底物相互作用，并且受生物学因素的限制。 BCR几乎定量地除去了丙酮和苯乙烯，直到有机负载量达到50g.m（-3）.h（-1）为止。从这一点出发，去除率随着负载率的增加而下降，同时溶解氧浓度显着下降，表明工艺过渡到了氧气受限的条件。但是，由于丙酮和降解中间体在水介质中的积累变得显着，由于有效的氧气质量转移，从空气中去除污染物的效率仍然很高，直至达到阈值加载速率。这些观察结果表明，氧气的可获得性是有效降解污染物的限制因素，而中间体的积累可作为氧气限制的指标。微生物（活性污泥）分析显示不受操作条件变化影响的变形虫和活性线虫的存在。

著录项

  • 来源
    《Journal of Environmental Science and Health》 |2017年第10期|905-915|共11页
  • 作者

    Vanek T.; Silva A.; Halecky M.; Paca J.; Ruzickova I.; Kozliak E.; Jones K.;

  • 作者单位

    Univ Chem & Technol, Dept Biotechnol, Prague, Czech Republic;

    Inst Super Tecn, Ctr Biol & Chem Engn, Lisbon, Portugal;

    Univ Chem & Technol, Dept Biotechnol, Prague, Czech Republic;

    Univ Chem & Technol, Dept Biotechnol, Prague, Czech Republic;

    Univ Chem & Technol, Dept Water Technol & Environm Engn, Prague, Czech Republic;

    Univ North Dakota, Dept Chem, Grand Forks, ND USA;

    Texas A&M Univ Kingsville, South Texas Environm Inst, Kingsville, TX USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Acetone; biodegradation; bubble column reactor; intermediates; styrene; waste air treatment;

    机译：丙酮;生物降解;鼓泡塔反应器;中间体;苯乙烯;废气处理;

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