Assessment of changes in microbial community structure during operation of an ammonia biofilter with molecular tools

Article Abstract:

A study was conducted to characterize microbial community structure in a laboratory-scale ammonia biofilter designed to remove ammonia through nitrification. Genomic DNA was purified from the perlite matrix while a sequence analysis was carried out on the cloned 16s rRNA genes to determine the individual members of the heterotrophic community. Results indicated that the amoA genes of clone BAC6 and Nitrosococcus oceanus were closely related to the pmoA genes of methane oxidizers than to the amoA genes of other ammonia oxidizers.

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Ethylene removal by a biofilter with immobilized bacteria

Article Abstract:

Isolated ethylene-oxidizing bacteria were immobilized on peat soil reduced ethylene concentration to a minimum level to 0.017 ppm after stable operation with 2.05 ppm of ethylene for 16 days. Moreover, the inlet ethylene concentration of 1177 ppm decreased to less than 0.04 ppm. The ethylene removal rate increased during operation with 2 and 117 ppm of ethylene due to the growth of the immobilized bacteria, but decreased with increasing storage time.

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Ethylene removal at low temperatures under biofilter and batch conditions

Article Abstract:

Research demonstrates that plant hormone ethylene can be removed from horticultural storage facilities by microbes incorporated into the soil. Data show that under batch and biofilter conditions, the method effectively removes ethylene at temperatures as low as 0 to 2 C.

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