BTOFTLTRATION FOR CONTROL OF VOLATILE ORGANIC COMPOUNDS CVOCS) Dolloff
نویسنده
چکیده
Air biofiltration is a promising technology for control of air emissions of biodegradable volatile organic compounds (VOCs). In conjunction with vacuum extraction of soils or air stripping of ground water, it can be used to mineralize VOCs removed from contaminated soil or groundwater. The literature (1) describes three major biological systems for treating contaminated air bioscrubbers, biotrickling filters and biofilters. Bioscrubbers, which are not evaluated here, use counter current gas-liquid spray columns with microorganisms freely suspended in the aqueous phase. Biofilters and biotrickling filters use microbial populations in biofilms immobilized on support media to degrade or transform contaminants in air. Filter media can be classified as: bioactive fine or irregular particulates, such as soil, peat, compost or mixtures of these materials; pelletized, which are randomly packed in a bed; and structured, such as monoliths with defined or variable passage size and geometry. The media can be made of sorbing and nonadsorbing materials. Nonbioactive pelletized and structured media require recycled solutions of nutrients and buffer for efficient microbial activity and are thus called biotrickling filters. Filters with bioactive fine or irregular particulates as media, referred to as biofilters, usually do not recycle solutions of nutrients and buffers to prevent media compaction and gas channeling. All filters humidify the contaminated air before biotreatment. .
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