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首页> 外文期刊>Journal of Petroleum & Environmental Biotechnology >Degradation of Elevated Concentrations of Phenol Using Two-StageImmobilized Cell Reactor with Bacillus subtilis and Acinetobacter lwoffii
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Degradation of Elevated Concentrations of Phenol Using Two-StageImmobilized Cell Reactor with Bacillus subtilis and Acinetobacter lwoffii

机译：带有枯草芽孢杆菌和lwoffii不动杆菌的两阶段固定化细胞反应器降解高浓度的苯酚

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Two vertical rotating immobilized cell reactors (VRICRs), one with the Bacillus subtilis, BDCC-TUSA-3 for bisurfactant (surfactin) production and the other with Acinetobacter lwoffii, accession number KM985371 for phenol biodegradation were constructed, with polyurethane foams as the attachment support. They were separately optimized for surfactin production and degradation of phenol respectively. Then, the two reactors were combined to form a two-stage VRICR where an appropriate fraction of Bacillus sp. reactor effluent, containing surfactin (0.20 g.l-1, 0.25 g.l-1 or 0.30 g.l-1), was mixed with the influent fed into A. lwoffii reactor, containing various concentrations of phenol (1500 mg.l-1, 1870 mg.l-1 and 2250 mg.l-1). The VRICR was operated continuously over more than two weeks. Cell growth, cell viability, degradation efficiency of phenol and specific degradation rate (SDR) were followed over periods of operation. The best results were obtained when a steady state was reached with 45.6 g.l-1, 98%, 100% and 810 mg phenol. g immobilized cells-1.h-1 for cell growth, cell viability, degradation efficiency and SDR respectively. Additionally, surfactin was produced from reactor 1 at high concentration (5.05 g.l-1) with a volumetric reactor productivity of 757.5 mg surfactin l-1.h-1 which represents an extra added-value product that could markedly decrease operating costs. The efficient process for phenol degradation, with no secondary by-products, coupled with potential applicability of simultaneously produced surfactin that could be utilized in many industrial applications, makes the two-stage VRICR a potential candidate for a clean, cost-effective and environmentally sustainable process.
机译：建造了两个立式旋转固定细胞反应器（VRICR），一个用枯草芽孢杆菌，BDCC-TUSA-3生产双表面活性剂（表面活性素），另一个用不动杆菌生产，登录号KM985371用于苯酚生物降解，其中聚氨酯泡沫为附着载体。 。它们分别针对表面活性素的生产和苯酚的降解分别进行了优化。然后，将两个反应器合并以形成两阶段的VRICR，其中适当级分的芽孢杆菌属。将含有表面活性素（0.20 gl-1、0.25 gl-1或0.30 gl-1）的反应器流出物与进料到A. lwoffii反应器中的进料混合，其中含有不同浓度的苯酚（1500 mg.l-1，1870 mg。 -1和2250 mg.-1）。 VRICR连续运行了两个多星期。在整个手术过程中，观察细胞的生长，细胞活力，苯酚的降解效率和比降解率（SDR）。当使用45.6 g.l-1、98％，100％和810 mg苯酚达到稳态时，可获得最佳结果。 g固定的cell-1.h-1分别用于细胞生长，细胞活力，降解效率和SDR。另外，从反应器1以高浓度（5.05g.l-1）生产表面活性素，反应器的容积生产率为757.5mg表面活性素1-1.h-1，这是可以显着降低操作成本的额外的增值产品。有效的苯酚降解工艺，没有副产物，再加上同时生产的表面活性剂的潜在适用性，可以在许多工业应用中使用，这使得两阶段VRICR成为清洁，经济高效且环境可持续的潜在候选者处理。

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