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首页> 外文会议>Air Waste Management Association's Annual conference Exhibition >Screening of Fungi for Biodegradation of Volatile Organic Compounds
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Screening of Fungi for Biodegradation of Volatile Organic Compounds

机译：挥发性挥发性有机化合物生物降解的真菌筛选

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Many industrial practices and waste treatment operations produce gas streams containing volatile organic compounds (VOCs) that require treatment. Although biological treatment has been applied successfully to treat many waste gases, the literature contains numerous reports of diminished treatment performance under conditions of excessive drying or low pH in biofilter beds. Use of fungi in biofilter treatment systems may mitigate these effects. Recent research indicates that some fungal species are able to tolerate low pH conditions and low moisture environments. Although many fungal species have been tested for their ability to degrade nonvolatile compounds, relatively few accounts of fungal degradation of VOCs have appeared in the literature to date. In the studies described herein, five fungal species, Exophiala lecanii-corni, Mucor rouxii (ATCC 44260), Phanerochaete chrysosporium (ATCC 24725), Cladosporium sphaerospermum (ATCC 200384), and Cladosporium resinae (ATCC 34066) were screened for their ability to degrade compounds commonly found in paint spray booth off-gases. Fungal cultures inoculated on to ceramic support media were provided VOCs as their sole carbon and energy sources. Compounds tested included aromatic hydrocarbons (benzene, p-xylene), ketones (methyl ethyl ketone), and an organic acid (n-butyl acetate). Experiments were conducted using a variety of pH values ranging from 3.5 to 6.5. Fungal ability to degrade each VOC was determined by observing presence or absence of visible growth on the ceramic support media during a 30-day test period. Results indicate that Exophiala lecanii-corni and Cladosporium sphaerospermum can readily utilize n-butyl acetate, methyl ethyl ketone, benzene, and p-xylene as their sole carbon and energy source. Phanerochaete chrysosporium was able to degrade n-butyl acetate, methyl ethyl ketone, and benzene but not p-xylene under the conditions tested. Cladosporium resinae was able to degrade n-butyl acetate and methyl ethyl ketone but not benzene or p-xylene under the conditions tested. Mucor rouxii was able to use n-butyl acetate as a sole carbon and energy source; however, it was unable to utilize any of the other VOCs tested under the conditions imposed. Maximum growth for most of the tested fungi was observed at a pH value of approximately 5.0. Results of these screening studies reveal that not only are several fungal species capable of degrading the compounds tested, they also suggest that the experimental methods described herein may be of use in conducting further screening studies for candidate microorganisms.
机译：许多工业实践和废物处理操作产生的气体流含有挥发性有机化合物，需要处理（VOC）的。尽管生物治疗已成功地应用于治疗多种废气，该文献中的过度干燥或低pH生物滤池床的情况下减弱处理效果的许多报告。在生物滤池处理系统使用的真菌可以减轻这些影响。最近的研究表明，一些真菌物种能够忍受低pH值条件和低湿度的环境中。虽然许多真菌物种已被其降解挥发性化合物的能力，挥发性有机物的降解真菌相对较少的账户已经出现在迄今的文献。在研究中本文所描述，五个真菌物种，外瓶枝菌三级-山茱萸，毛霉鲁氏（ATCC 44260），黄孢原毛平革（ATCC 24725），枝孢sphaerospermum（ATCC 200384）和枝孢resinae（ATCC 34066）进行筛选的能力降解化合物中的喷漆室的废气中常见的。接种到陶瓷载体介质真菌培养物的VOC提供作为其唯一碳和能量来源。测试的化合物包括芳族烃（苯，对二甲苯），酮类（甲基乙基酮），和有机酸（乙酸正丁酯）。实验使用的各种pH值下，从3.5至6.5下进行。降解每个VOC真菌能力通过在30天的测试期间观察存在或不存在的陶瓷载体介质上可见生长的确定。结果表明，外瓶枝菌三级-山茱萸和枝孢sphaerospermum可以容易地利用乙酸正丁酯，甲基乙基酮，苯和对二甲苯作为其唯一的碳源和能源。孢原毛平革菌是能够降解乙酸正丁酯，甲基乙基酮，和在测试条件下苯但不是对二甲苯中。枝孢resinae是能够降解乙酸正丁酯和甲基乙基酮而不是测试条件下的苯或对二甲苯。鲁氏毛霉能够使用乙酸正丁酯作为唯一碳源和能量源;但是，它无法利用任何所施加的条件下测试的其它VOC的。在约5.0的pH值，观察到对于大多数所测试的真菌的最大生长。这些筛选研究的结果显示，不仅能够降解化合物测试了几种真菌种类，但它们还表明，本文中描述的实验方法可以是使用在进行进一步筛选研究候选微生物。

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