공기리프트 반응기에서의 생물입자를 이용한 폐수 질화 및 유기물 동시산화에 대한 반응기 모델을 제시하였다. 생물막 내에서 물질확산과 반응, 액-고 물질전달 및 기-액 산소전달을 고려하였으며, 반응기 액상 부유균체에 의한 질화 및 유기물 산화도 동시에 고려하였다. 이중 모노드 식을 질화 및 유기물 산화 반응을 묘사하는데 적용하였다. 수치모사방법을 사용하여 생물막 유효물질확산계수, 담체크기, 공기유속 및 반응기 운전압력, 유입수 유량 및 유기물농도, 그리고 생물막 내 유기물 최대산화속도가 공기리프트 반응기에서의 폐수 질화 및 유기물 산화에 미치는 영향을 분석하였다. 공기유속, 담체질량 및 생물막 두께 등의 주어진 조건에서 담체크기가 감소함에 따라 암모니움 및 아질산 산화속도는 증가하였다. 질화 및 유기물 동시산화 반응에서 반응기 용존산소농도에 아질산 산화반응이 먼저 영향을 받으며 유기물 산화반응은 부유균체 농도에 영향을 받는 것을 보였다. 유입수 유기물농도가 증가함에 따라 유기물 산화속도는 증가하였고 암모니움 및 아질산 산화속도는 감소하였다.

A reactor model was developed for the simultaneous nitrification and organic oxidation of wastewater in airlift reactors with bioparticles. The diffusion and reaction in the biofilm of bioparticles, liquid-solid mass transfer, and gas-liquid oxy-gen transfer were taken into account together with the consideration of the nitrification and organic oxidation by the biomass suspended in the liquid phase of the reactor. Double Monod-type kinetics was employed for representing the reactions of the nitrification and the organic oxidation. Using the numerical simulation, it was discussed how the nitrification and the organic oxi-dation of the wastewater were influenced in the airlift reactor by effective diffusivity in the biofilm, bioparticle media size, air_x000D_ velocity and reactor operation pressure, flow rate and organic concentration of the feed, and maximum organic oxidation rate in the biofilm. The oxidation rate of ammonia and nitrite increased at the given conditions of the air velocity, the media amount and the biofilm thickness, as decreasing the media size. It was demonstrated in the simultaneous nitrification and organic oxidation of wastewater that the nitrite oxidation was first affected by the reactor liquid-phase concentration of dissolved oxygen and the organic oxidation was influenced by the biomass suspended in the liquid phase of reactor. As increasing the organic concentra-tion of the feed, the organic oxidation rate increased but the oxidation rates of ammonia and nitrite decreased.

Nitrification Organic Oxidation Airlift Biofilm Suspension Reactor Biofilm Model Gas-Liquid Mass Transfer Liquid-Solid Mass Transfer

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