S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Civil & Environmental Engineering (건설환경공학부) Journal Papers (저널논문_건설환경공학부)
16S rRNA 염기서열을 이용한 낮은 용존산소농도에서 발생한 벌킹슬러지의 우점종 분석
Analysis of Dominant Microorganisms of Bulking Sludge at Low Dissolved Oxygen Concentration using 16S rRNA Sequences
- 김윤중; 박은혜; 김규동; 남경필; 정태학
- Issue Date
- 한국물환경학회지, 20(5), pp. 506-511
- Maintaining dissolved oxygen(DO) at sufficiently low concentration in the aeration tank at a wastewater treatment plant(WWTP) is essential for reduction of the costs ofoperation and maintenance. On the other hand, the low DO level may result in adverse effect on the integrity of the activated sluge. A typical and disastrous outcome frequently experienced is the outgrowth of filamentous microorganisms, whichi is called as filamentous bulking. In addition to the traditional methods such as sludge settleability and microscopic observation of the culture, molecular techmiques including polymerase chain reaction(PCR) amplification followed by 16S rRNA sequencing were applied to identify filamentous bacteria present in bulking sludge under a condition of low DO concentration. Two morphologically distinct groups, presumably consisting of Sphaerotilus natans, and Eikelboom Type 1701 or Type 1851, were identified through microsecopic observation. They were further confirmed by subsequent 16S rRNA sequecing. Dominant filamentous bacteria identified by the molecular techniques were consisted of three major groups. Sequences of partial 16S rRNA cloned showed that the filamentous bulking organisms were closely related to Eikelboom Type 021N and Eikelboom Type 1701, and Sphaerotilus natans, respectively. Molecular methods were found to possess a strong potential of direct exmination of the microbial community of an activated sludge system.
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