서지주요정보
전산유체를 이용한 여과지 역세척공정의 평가방법에 관한 연구 = Development of an evaluation method of the backwash process in granular filtration using computational fluid dynamics
서명 / 저자 전산유체를 이용한 여과지 역세척공정의 평가방법에 관한 연구 = Development of an evaluation method of the backwash process in granular filtration using computational fluid dynamics / 김성훈.
저자명 김성훈 ; Kim, Sung-Hoon
발행사항 [대전 : 한국과학기술원, 2000].
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소장정보

등록번호

8011107

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 00011

SMS전송

도서상태

이용가능

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반납예정일

초록정보

Filtration in water treatment is the last process that removes suspended solid and other substances after sedimentation process. The most critical process in filtration is backwash which removes the deposit in the filtration media. The basic factors of backwash efficiency are size of the media, shape of the media, density of the media, quality of the influent water, temperature of the water and use of coagulant. Many researchers have studied the backwash mechanisms to develop theories of media expansion according to the backwash rate, optimum backwash velocity to produce optimum shear force, etc. The mudballs formed during the filtration process are not easily removed even by hard backwash. To cope with this problem, a new method of air-scoured backwash was introduced. In spite of its disadvantages of media loss and abrasion, its implementation is growing because of its advantages such as reduced wastewater and no need for re-stratification. Recently, as the numerical calculation techniques improve, CFD(Computational Fluid Dynamics) methods are introduced into environmental engineering. The analysis of filtration process must be based on 2 or 3 phase formulation, so CFD is useful in analyzing the filtration and backwashing process. In this thesis, multi-phase model and buoyant model in CFX version 4.2 were used to simulate the expansion model which takes the particle size distribution into account. And from the result of this simulation, predictions were made for other various conditions. To interpret the experimental result, the behavior of the bubbles in the bed was speculated. The modeling and experimental results conclude as follows: ① Through modifications and evaluations, CFX codes were used to predict the expansion of the media in the bed during the backwash process. The model which incorporates the particle size distribution produced results closer to the experimental data. ② As the result of this CFD analysis, it was found out that current backwashing process is operated in excessive condition. ③ Sensitivity analysis on the model reveals that viscosity plays a critical role in the media expansion. ④ In the case of air-scoured backwash, smaller bubbles produced larger effect, and a model was developed to explain this.

서지기타정보

서지기타정보
청구기호 {MCE 00011
형태사항 v, 59 p. : 삽도; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Sung-Hoon Kim
지도교수의 한글표기 : 박희경
지도교수의 영문표기 : Hee-Kyung Park
학위논문 학위논문(석사) - 한국과학기술원 : 토목공학과,
서지주기 참고문헌 : p. 56-59
주제 여과 공정
역세척 공정
공기병용 역세척
전산유체해석
Filtration
Backwash
Backwash with air scour
Computational Fluid Dynamics(CFD)
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