직경 0.102 m인 삼상 순환유동층 반응기에서 합성폐수로부터 암모니아 성분 및 COD의 제거를 연구하였다. 대전 원천동의 폐수처리장에서 사용하는 활성슬러지를 미생물로 사용하였다. 여과된 압축공기와 합성폐수를 각각 기체와 액체상으로 사용하였으며, 미생물이 표면에 점착된 직경이 0.4 mm인 음이온 고분자 수지를 유동고체 담체입자로 사용하였다. 폐수 중 초기 암모니아 농도와 담체유동입자의 체류량이 폐수 중 NH4(+)이온과 COD의 제거효율 및 제거량에 미치는 영향을 검토하였다. 반응온도와 pH 그리고 폐수 중 용존산소의 농도는 각각 20 ℃, 7 그리고 6-7 mg/L로 유지하였다. 본 연구의 결과로부터 삼상 순환유동층 생물반응기는 폐수로부터 NH4(+)와 COD의 연속적 제거에 매우 효과적으로 사용될 수 있는 장치임이 판명되었다. 표면에 미생물이 점착된 담체유동입자의 사용은 폐수 중 NH4(+)와 COD의 제거효율을 상당히 증가시킬 수 있었다. 폐수 중 NH4(+)와 COD의 제거효율은 활성미생물이 점착된 담체입자의 체류량이 증가함에 따라 증가하였으나 폐수 중 NH4(+)의 초기농도가 증가함에 따라 감소하였다. 폐수 중 NH4(+)와 COD의 제거효율은 폐수 중 NH4(+)의 농도와 담체입자 체류량의 조합과 밀접한 관계가 있음을 알 수 있었으며, 담체입자의 최적 첨가량은 폐수 중 NH4(+)의 농도에 따라 달라졌다.

The removals of nitrogenous component(NH4(+)) and COD from the synthetic waste water have been investigated in a three-phase circulating fluidized-bed reactor whose diameter is 0.102 m. Activated sludge which is used for waste water treatment at the Wonchun-dong in Daejon has been employed as a microorganism. Filtered compressed air and synthetic waste water have been used as a gas and a liquid phase, respectively. Anion polymer resin whose diameter is 0.4 mm has been used as a fluidized solid substrate, at which microorganism has been adhered. Effects of initial concentration of NH4(+) in the waste water and substrate holdup on the efficiency as well as amount of the removal of NH4(+) and COD have been discussed. The reaction_x000D_ temperature, pH and concentration of dissolved oxygen have been maintained at 20 ℃, 7 and 6-7 mg/L, respectively. It has been found, from the results of this study, that the three-phase circulating fluidized-bed bioreactor can be utilized as an effective scheme to remove the NH4(+) and COD in the waste water continuously. The use of substrate particle with microorganism_x000D_ adhered at its surface can increase the removal efficiency of NH4(+) and COD considerably. The removal efficiencies of NH4(+) as well as COD have increased with increasing the holdup of substrate with active microoranism, but decreased with increasing the initial concentration of NH4_x000D_ (+) in the waste water. The efficiency has been found to be closely related to the combination of_x000D_ the initial concentration of NH4(+) and substrate holdup in the reactor; the optimum amount of substrate has been dependent upon the initial concentration of NH4(+) in the waste water.

Three Phase Circulating Fluidized Bed Ammonia Nitrification Bio-Reactor

Bernard J, "Technical Advanced in Biofilm Reactor," Proceedings of the LAWPRC Conf., 22, Pergamon Press (1990)
Baek NH, Walker I, HWAHAK KONGHAK, 18(2), 117 (1980)
Gallo T, Sandfors DS, Presented at the 86th National Meeting of AIChE, Houston, Taxas, April (1979)
Redman J, The Chemical Engineer, October (1987)
Jung WC, Kim HG, Lee BY, HWAHAK KONGHAK, 24(5), 381 (1986)
Choi HS, Shin MS, Korean J. Chem. Eng., 16(5), 670 (1999)
Lee DH, Epstein N, Grace JR, Korean J. Chem. Eng., 17(6), 684 (2000)
Cho YJ, Park HY, Kim SW, Kang Y, Kim SD, Ind. Eng. Chem. Res., in press (2002)
Park HY, Kim SW, Cho YJ, Kang Y, Kim SD, HWAHAK KONGHAK, 39(5), 619 (2001)
Park YS, Ahn KH, Suh JH, Choi YC, Choo SR, Song SK, HWAHAK KONGHAK, 35(1), 8 (1997)
Liang W, Wu Q, Yu Z, Jin Y, Wang Z, Can. J. Chem. Eng., 73(5), 656 (1995)
Yang WG, Wang JF, Zhou LM, Jin Y, Chem. Eng. Sci., 54(22), 5523 (1999) 
Hamoudi S, Belkacemi K, Sayari A, Larachi F, Chem. Eng. Sci., 56(4), 1275 (2001) 
Cho YJ, Song PS, Kim SH, Kang Y, Kim SD, J. Chem. Eng. Jpn., 34(2), 254 (2001) 
Gabriel B, Wastewater Microbiology, John Wiley & Sons (1994)
U.S. EPA: Process Design Manual for Nitrogen Control, Office of Technology Transfer, Washington, D.C. (1975)
Park IC, Korea Advanced Institute of Science and Technology Master degree Thesis (1995)
U.S. EPA: Nitrogen Control. EPA/625/R-93/010 (1993)
Woo DS, Nam SH, Korean J. Environ. Hlth. Soc., 21, 17 (1995)
Pintar A, Batista J, Levec J, Kajiuchi T, Appl. Catal. B: Environ., 11(1), 81 (1996)