양식장 배출수에 첨가된 항생제 제거 위한 수중 비열 유전체장벽 방전 플라즈마 처리 효과
Effect of plasma treatment using underwater non-thermal dielectric barrier discharge to remove antibiotics added to fish farm effluent
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본 연구의 목적은 양식장 배출수 내에 포함된 5종의 항생제(tetracycline, doxycycline, oxytetracycline, clindamycin 및 erythromycin)를 제거하기 위해 사용한 수중 비열 유전 체장벽 방전 플라즈마(Dielectric Barrier Discharge plasma, DBD plasma) 장치 안으로 공기와 산소를 각각 주입했을 때 항생제의 제거효율을 비교하는 것이다. DBD plasma를 발생시키기 위해서 주어진 전압은 27.8 kV이었고, 처리간격은 0, 0.5, 1, 2, 4, 8, 16 및 32분이었다. 3종의 tetracycline 계 항생제는 공기를 주입했을 때는 4분만에 유의하게 감소하였고, 산소를 주입했을 때는 30초만에 유의성을 나타내었다. 32분째 공기와 산소를 각각 주입한 결과, tetracycline은 78.1%와 95.8%, doxycycline은 77.1%와 96.3% 그리고 oxytetracycline은 77.1%와 95.5% 감소하였다. Clindamycin은 공기를 주입했을 때 59.6%가 감소되었고, 산소는 83.0% 감소되었다. 또한, erythromycin은 공기 주입 시 53.3%가 감소되었고 산소 주입 시 74.3%가 감소하여 두 항생제 모두 tetracycline계 항생제보다 낮은 제거 효율을 보였다. 결론적으로 수중 DBD plasma는 양식장 배출수 내에 포함된 5종의 항생제를 감소시킬 수 있고, 제거 효율은 공기보다 산소를 주입하는 것이 더 효과적이다.
Abstract
The purpose of this study was to compare the efficiency of air and oxygen injected into the underwater non-thermal dielectric barrier discharge plasma (DBD plasma) device used to remove five types of antibiotics (tetracycline, doxycycline, oxytetracycline, clindamycin, and erythromycin) artificially contained in the fish farm discharge water. The voltage given to generate DBD plasma was 27.8 kV, and the measurement intervals were 0, 0.5, 1, 2, 4, 8, 16 and 32 minutes. Tetracycline antibiotics significantly decreased in 4 minutes when air was injected and were reduced in 30 seconds when oxygen was injected. After the introduction of air and oxygen at 32 minutes, 78.1% and 95.8% of tetracycline were removed, 77.1% and 96.3% of doxycycline were removed, and 77.1% and 95.5% of oxytetracycline were removed, respectively. In air and oxygen, 59.6% and 83.0% of clindamycin and 53.3% and 74.3% of erythromycin were removed, respectively. The two antibiotics showed lower removal efficiency than tetracyclines. In conclusion, fish farm discharge water contains five different types of antibiotics that can be reduced using underwater DBD plasma, and oxygen gas injection outperformed air in terms of removal efficiency.
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