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미생물 막을 이용한 유동층 반응기에서의 생물학적 탈질화에 관한 연구
임교빈,김우식 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.2
The effects of initial concentration, flow rate and recycle ratio were studied in a cylinderical reactor packed with activated carbon which was attached with biomass. The optimum conditions of Bacillus licheniformis were showed as pH was 7.0 and temperature was 30 degrees centigrade. In the case of initial concentration of 20mg ??-N/L, the removal efficiency was above 90% and it was from 63 to 80% for 80mg ??-N/L. According to the increase of initial concentration and flow rate, the removal efficiency was gradually decreased. For all of the initial concentrations and flow rates in the range of this experiment, the final concentration of Nitrate was decreased to the concentration of 1∼2mg ??-N/L when the recycle ratio is 4. As a rational basis of reactor design, mathematical model of biological denitrification in Fluidized Bed Biofilm Reactor was derived. ?? where a = ?? b = ??
김우식,오준택,박함용,임교빈 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.2
한외여과에서 난류발생에 의해 농도분극을 감소시켜 막투과 flux를 증가시키고 분리효율을 높이기 위하여 난류촉진물로서 현재 나권형 모듈에서 쓰이는 유로 형성체(feed spacer)를 평판형 한외여과 cell에 적용하였다. 난류촉진물을 사용하여 dextran 500,000 용액의 한외여과 실험결과 막투과 flux는 막의 종류와 압력차, 순환유속, 도입용액 농도 등의 조작조건에 따라 13.8-114.4%의 증가율을 보였다. 한편 농도분극층 내에서의 용질의 물성변화를 고려하여 기존의 Sherwood수 상관관계식을 보정하고, 그 타당성을 검토하였는데, 보정된 Sherwood수 상관관계식은 기존의 관계식에 비하여 향상된 결과를 보였으며, 그 관계식은 아래와 같다. N_(sh)=0.306(N_(Re))^(0.285)(N_(Sc))^(0.330)(N_(Scm))^(0.113) A channel spacer of spiral-wound membrane module was applied to a flat plate ultrafiltration cell as a turbulence promoter in order to reduce concentration polarization in ultrafiltration of dextran(M.W. 500,000) solution. As a result of using turbulence promoter the permeate flux was improved by 13.8-114.4% depending on membranes and operational conditions. Mass transfer correlation was modified by considering variation of physical properties(viscosity, density and diffusivity) in concentration polarization layer. The modified mass transfer correlation showed better agreement with experimental results than the conventional one. The modified mass transfer correlation is as follow: N_(sh)=0.306(N_(Re))^(0.285)(N_(Sc))^(0.330)(N_(Scm))^(0.113)