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양이온 교환막을 이용한 암모니아의 분리 및 생물학적 질산화
박우신 ( Woo Shin Park ),남윤구 ( Youn Ku Nam ),이면주 ( Myun Joo Lee ),김탁현 ( Tak Hyun Kim ) 한국공업화학회 2009 응용화학 Vol.13 No.1
A novel biological nitrification system was designed. It consists of two chambers separated by a cation exchange membrane. One is an anaerobic fermentation reactor and the other is a biological nitrification reactor. A wastewater is fed into the anaerobic reactor and the ammonia moves to the nitrification reactor via the cation exchange membrane. The ammonia is oxidized to nitrate by nitrifying bacteria in the nitrification reactor. In a conventional process, organics are removed in an anaerobic fermentation reactor and then the ammonia is subsequently oxidized in a nitrifying reactor. Therefore, the total process requires a long period of time and the residual organics inhibit the efficiency of the nitrification. In this system, the ammonia is independently oxidized since the cation exchange membrane allows not the organics but the ammonia to move into the nitrification reactor.
남윤구 ( Youn Ku Nam ),박우신 ( Woo Shin Park ),이면주 ( Myun Joo Lee ),김탁현 ( Tak Hyun Kim ) 한국공업화학회 2009 응용화학 Vol.13 No.1
In this study, it was examined the effects of the pre-treatment of gamma radiation on composting and pathogen bacteria reduction. It was expected that the strong oxidants would be produced by irradiation and they made a critical role in destructing and/or enfeebling solid materials. For the start-up of the all composting reactor, a feedstock was prepared by pig manure and sawdust material mixed of the C/N rate 25. All reactors were packaged with the 4.5kg feedstock. They were irradiated by a cobalt-60 gamma irradiator at the dose of 0, 3, 5, 10 and 20 kGy. The temperature patterns of composting reactor were not different between irradiated and non-irradiated reactors. The CO2 gases of the irradiated reactors were decreased than non-irradiated reactor. the optimal composting condition was 10kGy irradiation and 10~20% seeding ratio.
축산폐기물에서 분리된 항생제 내성균 Escherichia coli와 Brevibacterium sp.의 내성 특성 및 감마선 살균 효능
장은희(Eun Hee Jang),정상혁(Sang Hyuk Jung),남윤구(Youn Ku Nam),박우신(Woo Shin Park),이면주(Myun Joo Lee),김탁현(Tak Hyun Kim) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.7
축산 폐기물에서 항생제에 대해 내성을 가지는 균주을 분리하여, 다양한 항생제에 대한 내성특성을 확인하고, 감마선의 조사에 따른 내성균의 항생제 내성 특성변화와 살균효능에 관한 연구를 수행하였다. 그 결과, 돈분과 돈분퇴비에서 분리된 균주중 Escherichia coli와 Brevibacterium sp.이 다제내정균으로 확인되었다. E. coli는 13종의 항생제 중 9종의 항생제에 대해 내성을 나타내었으며, Brevibacterium sp.는 7종의 항생제에 대한 내성을 나타내었다. 이 두 가지 대표 다제내성균에 대해 감마선을 이용한 살균실험을 시행한 결과,Escherichia coli는 항생제에 대한 내성이 돌연변이적으로 발생하기 쉬운 균주이나 감마선을 이용해 효율적으로 제어할 수 있는 것으로 나타났고, 그에 반해 Brevibacterium sp.는 저선량에서 감마선에 대한 내성을 나타내어 상대적으로 감마선을 이용한 제어가 용이하지 않았다. Brevibacterium sp.는 2.0 kGy의 조사량에 대해 Escherichia coli에 비해 약 100배 정도 낮은 살균 효율을 보임으로써, 감마선에 대한 내성이 강한 것으로 나타났다. Antibiotic resistant bacteria were isolated from livestock wastes and the resistance patterns were investigated using various antibiotic agents. Also, a gamma ray was tested regarding the aspects of the effect on resistance pattern and the efficiency of disinfection. Among the isolates, Esherichia coli and Brevibacterium sp. showed the most serious resistance patterns. Esherichia coli had resistance against 9 agents whereas Brevibacterium sp. against 7 agents. It can be suggested from these results that the abuse of antibiotic agents will cause a serious mutation problem even to Esherichia coli which is ubiquitous in the ecosystem. Esherichia coli could be easily controlled but Brevibacterium sp. had a moderate resistance to the gamma ray under low doses. In the case of Brevibacterium sp, more than 2.0 kGy of a radiation dose will be required in order to achieve an enhanced efficiency of disinfection.