A biofilter study was performed in order to remove mixed benzene and ethylene emitted from soil and groundwater remediation. In particular, more than 96% of ethylene was removed at residence times of 10～15 min, and the possibility of use of the biofilter was obtained. The benzene removal efficiency was achieved as much as 100% at residence times of 2～15 min. With a residence time of 15 min, the maximum elimination capacity of benzene and ethylene was 4.3 g/$\textrm{m}^3$hr and 1.4 g/$\textrm{m}^3$hr, respectively. The maximum elimination capacity of benzene was 3 times higher than that of ethylene. Carbon dioxide concentration decreased as residence times were lowered due to low ethylene degradation rate. The maximum carbon dioxide production rate of 3,169 [mg-$CO_2$/(g-${C_2}{H_4}$＋${C_6}{H_6$)] was investigated when benzene and ethylene were completely removed. It was found that dominant bacteria in the benzene-degrading microorganisms were identified as Bacillus mycoides and Pseudomonas fluorescens. Dominant bacteria in the ethylene-degrading microorganisms were identified as Pseudomonas putida and Pseudomonas fluorescens.

토양 및 지하수 복원 과정에서 벤젠과 에틸렌이 혼합되어 배출될 경우 이를 biofilter에 의해 처리한 결과, 에틸렌은 생분해가 잘 되지 않는 화합물인데도 불구하고 체류시간이 10～15분에서는 96%이상 높은 생물학적 처리를 보여 biofilter운전 가능성이 제시되었다. 2～15분 체류시간에서 혼합 VOCs중 벤젠은 모든 조건에서 100% 제거되었다. 체류시간이 15분일 경우 벤젠과 에틸렌의 최대 제거능은 각각 4.3과 1.4g/$\textrm{m}^3$hr로서 벤젠이 에틸렌에 비해 3배 정도 컸다. 체류시간이 작을수록 에틸렌 분해율 감소로 인하여 이산화탄소 발생도 감소함을 발견하였으며 벤젠과 에틸렌이 모두 제거되는 운전에서 최고 이산화탄소 발생률은 3,169 [mg-$CO_2$/(g-${C_2}{H_4}$＋${C_6}{H_6}$)]이었다. 벤젠 산화 미생물은 Bacillus mycoides와 Pseudomonas fluorescens로 동정되었고, 에틸렌 산화 미생물은 Pseudomonas putida와 Pseudomonas fluorescens로 각각 동정되었다.

Keywords: Activated carbon;Benzene;Biofilter;Degradation;Ethylene;Filter media;

Keywords: 활성탄;벤젠;분해;에틸렌;여재;