Biodegradation of benzo[α]pyrene, toluene, and formaldehyde from the gas phase by a consortium of Rhodococcus erythropolis and Fusarium solani
Biodegradation of benzo[α]pyrene, toluene, and formaldehyde from the gas phase by a consortium of Rhodococcus erythropolis and Fusarium solani
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DOI：
10.1007/s00253-017-8400-8
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发表时间：
2017-09-01
影响因子：
5
通讯作者：
Vergara-Fernandez, Alberto
中科院分区：
文献类型：
--
作者：
Morales, Paulina;Caceres, Manuel;Vergara-Fernandez, Alberto
多环芳烃（PAHs）和挥发性有机物（VOCs）是重要的室内污染物。它们的疏水性阻碍了使用生物过滤进行生物减排的可能性。我们的目的是确定是否使用镰刀菌和红红红球菌的联合体显示出改善的性能（在矿化率和程度方面）对甲醛的降解，作为一个轻微的极性VOC；甲苯，作为疏水性VOC；和苯并[α]芘（BaP）作为多环芳烃在低浓度下与血清瓶中以蛭石为固体载体的单一物种生物膜进行比较，模拟生物过滤器，并将可能的改善与三种不同温度下生物质的表面疏水性和分配系数联系起来。结果表明，植物碳源的疏水性会影响生物膜表面的疏水性，而红杉不受其影响。同样，与水中相比，solani生物量（无论是纯培养还是联合培养）中甲苯和BaP的分配系数降低了38倍，而在红杉中这种降低仅为1.5倍。尽管使用F. solani或联合体时，CO2累积量和产速率均有所增加，但甲苯的矿化程度低于25%。在BaP的降解方面，尽管纯培养的红孢霉对BaP的矿化能力较差，但使用茄茄菌和红孢霉联合培养时，CO2产率和产率均较高。
Polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs) are important indoor contaminants. Their hydrophobic nature hinders the possibility of biological abatement using biofiltration. Our aim was to establish whether the use of a consortium of Fusarium solani and Rhodococcus erythropolis shows an improved performance (in terms of mineralization rate and extent) towards the degradation of formaldehyde, as a slightly polar VOC; toluene, as hydrophobic VOC; and benzo[alpha]pyrene (BaP) as PAH at low concentrations compared to a single-species biofilm in serum bottles with vermiculite as solid support to mimic a biofilter and to relate the possible improvements with the surface hydrophobicity and partition coefficient of the biomass at three different temperatures. Results showed that the hydrophobicity of the surface of the biofilms was affected by the hydrophobicity of the carbon source in F. solani but it did not change in R. erythropolis. Similarly, the partition coefficients of toluene and BaP in F. solani biomass (both as pure culture and consortium) show a reduction of up to 38 times compared to its value in water, whereas this reduction was only 1.5 times in presence of R. erythropolis. Despite that increments in the accumulated CO2 and its production rate were found when F. solani or the consortium was used, the mineralization extent of toluene was below 25%. Regarding BaP degradation, the higher CO2 production rates and percent yields were obtained when a consortium of F. solani and R. erythropolis was used, despite a pure culture of R. erythropolis exhibits poor mineralization of BaP.