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사여과수에 존재하는 우점세균의 중압 자외선 램프 소독능
안승구(Seoung Koo Ahn),양윤용(Yoon Yong Yang) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.12
상수공급계 모래여과수에 존재하는 종속영양 호기성 세균을 NA 및 TSBA 고체배지로 분리하고 군체의 형태 및 색체로 구분 정량하여 우점종 8종을 선정, 정제하고 Sherlock System으로 동정하였다. 이들 각 종류의 세균에 대하여 액체배양한 후 세정하여 10(6)~10(7) cells/mL 증류수 현탁액을 조제하여 CBD 중압 자외선 램프로 0, 5, 16, 40, 60 mJ/cm2 조사량으로 조사한 후 희석, 평판배지에 접종 배양하여 생존 세균농도를 정량하여 불활성화율을 평가하였다. Gram 양성균으로 Bacillus subtillis, Bacillus megaterium, Rhodococcus erythropolis, Microbacterium laevaniformans 등이 Gram 음성균으로 Pseudomonas pseudoflava, Pseudomonas vesicularis, Alcaligenes paradoxus, Zooglea ramigera 등이 동정되었다. 분리된 세균종들은 중압 자외선 조사에 높은 저항성을 나타내었으며, 표준균주보다 강하였다. 또한 Gram 양성세균이 Gram 음성세균에 비해 월등히 강한 내성을 나타내었다. 중압 자외선 램프를 상수처리장의 소독목적으로 도입할 경우 60~100 mJ/cm2의 조사량으로 높여 조사하여야 할 것으로 판단된다. Isolated the heterotrophic aerobic bacteria in sandfiltered water on NA and TSBA solid medium, selected 8 dominant species and identified by Sherlock System. Each samples are irradiated 0, 5, 16, 40 and 60 mJ/cm2 using on CBD (Collimated Beam Device) Medium Pressure UV lamp after these identified bacterium did liquid culture how to make 10(6)~10(7) cells/mL suspended in dilution water. Then cultured bacteria are estimated inactivation rate on plate media. Identified Gram positive group are Bacillus Subtilus, Bacillus megaterium, Rhodococcus erythropolis and Microbacterium laevaniformans; Gram negative group are Pseudomonas vesicularis, Pseudomonas pseudoflava, Alcaligenes paradoxus and Zooglea ramigera. These isolation of bacterium are more stronger reference strain and high resistance of MP UV irradiation, Besides Gram negative bacterium are more sensitive Gram positive bacterium on MP UV dose. Now we are estimating to 60~100 mJ/cm2 MP UV dose for efficient disinfection in water treatment plant.
이희자(Hee Ja Lee),안승구(Seoung Koo Ahn) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.2
In this study, methane-oxidizing bacteria were isolated from a landfill cover soil and cultured in inorganic nutrient medium with methane as a carbon and energy source. The methane oxidation rate on O₂/CH₄ ratio and other important factors affecting the growth of methanotrophs were evaluated by batch cultures. Also, the possibility of aerobic denitrification by mixed culture of methanotrophs, NH₃ and NO₃^- removal rate on nitrogen concentration were investigated. The results of the study showed that methane-oxidizing bacteria were short rod and gram negative, and formed pink colonies. The settleability of the sludge was very good When O₂/CH₄ volume ratio were 1.8, 2.2 and 5.4, methane was oxidized in a first-order reaction with respect to the concentration of methane and rate coefficients of the reactions were 0.7, 0.9 and 1.1, methane was oxidized in a second-order reaction. Methanotrophs could tolerate pH fluctuations of influent, and the maximum denitrification rate and cell yield at pH 7.5 was 16.4㎎ NO₃^- -N/g VSS·hr and 12.2㎏ VSS/㎏ NO₃^- -N, respectively. The maximum specific growth rate of the methanotrophs was 0.3/day at 30℃, and the maximum denitrification rate was 35㎎ NO₃^- -N/g VSS·hr at 35℃. At a Cu variation of 0-30ppm, the growth rate of methanotrophs was highest at 1ppm. At an O₂/CH₄ volume ratio of 1.3, at which the growth rate was highest, and the maximum denitrification rate was 45㎎ NO₃^- -N/g VSS·hr. In the aerobic condition with DO concentration of 1.2㎎/L, denitrification rate was increased in porportion to nitrate concentration, Vmax and Ks were 3.5㎎ NO₃^- -N/g VSS·hr, 145㎎ NO₃-N/L, respectively.