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首页> 外文期刊>Environmental Science & Technology >Two-Phase Partitioning Bioreactors Operating with Polymers Applied to the Removal of Substituted Phenols
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Two-Phase Partitioning Bioreactors Operating with Polymers Applied to the Removal of Substituted Phenols

机译：与聚合物一起操作的两阶段分配生物反应器，用于去除取代的苯酚

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摘要

Significant improvement in biodegradation performance has been demonstrated arising from the reduction of cytotoxicity provided by the sequestering of 4-nitrophenol (4NP) within Hytrel polymer beads added to a two-phase partitioning bioreactor (TPPB) operating in sequencing batch reactor (SBR) mode. This reduced toxicity is particularly apparent as the feed substrate concentration is increased; in fact it was shown that at a feed of 1000 mg/L 4NP, the inhibitory effect of the substrate completely prevents degradation from occurring in a single-phase system, whereas at only a 5% polymer loading, rapid and compete biodegradation is achieved. Different polymer/ aqueous phase ratios were used to detoxify varying feed concentrations, and degradation rates were enhanced through the use of increased polymer loadings. As demonstrated in oxygen uptake experiments, the addition of polymers also reduces the maximum demand for oxygen, relative to single-phase operation, and smoothes the demand for oxygen throughout the degradation process. Polymer regeneration has also been further characterized by quantifying the number of methanol washes required to achieve satisfactory 4NP residuals, and the addition of a small amount of cosolvent has been shown to dramatically increase the rate of bioregeneration to produce beads ready for reuse.
机译：已经证明，通过将Hytrel聚合物珠粒中的4-硝基苯酚（4NP）螯合添加到以分批分批反应器（SBR）模式运行的两相分配生物反应器（TPPB）中，可以降低细胞毒性，从而证明了生物降解性能的显着改善。随着饲料底物浓度的增加，这种降低的毒性尤为明显。事实上，事实证明，在进料为1000 mg / L 4NP的情况下，底物的抑制作用完全防止了单相系统中的降解，而仅在5％的聚合物负载量下，即可实现快速而竞争的生物降解。使用不同的聚合物/水相比率对不同的进料浓度进行解毒，并且通过使用增加的聚合物负载来提高降解速率。如氧气吸收实验所示，相对于单相操作，添加聚合物还降低了对氧气的最大需求，并在整个降解过程中使对氧气的需求趋于平稳。聚合物再生的特征还在于通过量化获得令人满意的4NP残留物所需的甲醇洗涤次数，并且显示出添加少量的助溶剂可显着提高生物再生的速度，以生产可重复使用的珠子。

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  • 来源
    《Environmental Science & Technology》 |2010年第19期|p.7254-7259|共6页
  • 作者

    M. CONCETTA TOMEI; M. CRISTINA ANNESINI; SARA RITA; ANDREW J. DAUGULIS;

  • 作者单位

    Water Research Institute, C.N.R., Via Salaria km 29.300, CP 10-00015 Monterotondo Stazione (Rome) Italy;

    rnDepartment of Chemical Engineering Materials & Environment, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy;

    rnWater Research Institute, C.N.R., Via Salaria km 29.300, CP 10-00015 Monterotondo Stazione (Rome) Italy;

    rnDepartment of Chemical Engineering, Queen's University,Kingston, Ontario, Canada K7L 3N6;

  • 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);
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