하수처리를 위한 MASA 시스템의 동역학적 해석 = Kinetic Analysis of MASA(Modified Advanced Step Aeration) System for Wastewater Treatment

국문 초록 (Abstract)

최근 도시와 산업의 급속한 발달, 인구의 증가와 생활수준의 향상 등으로 인하여 하폐수 발생량이 증가됨에 따라 수질 오염이 가속화되고 있으며, 폐수 중의 난분해성 유기물질 성분이 차지하는 비율이 증가하고 있다. 특히 질소, 인 제거가 큰 과제로 대두되며 문제점을 개선하는 것이 중요한 과제로 남아있다. 따라서 본 연구는 고도 단계 유입 혐기호기공법(ASA: Advanced Step Aeration)에 MAB (Membrane Attached Biofilm)를 적용한 MASA (Modified ASA system)시스템을 이용하여 유기물질과 질소의 동역학적 해석 및 슬러지 발생량 평가를 하였다. MASA 시스템의 동역학적 계수를 산정한 결과 최저 수온인 14.1℃를 기준에서 호기조-1과 호기조-2의 값이 1.56, 0.66 mgN/gMLVSS·hr, 무산소조의 값이 1.09 mgN/gMLVSS·hr로 나타나 기존 ASA 시스템의 호기조의 값이 0.98 mgN/gMLVSS·hr에 비해 질산화 효율이 37.17%로 증가되어 질산화가 효과적으로 일어남을 알 수 있었다. 질소에 대한 물질수지 이론식을 이용하여 반응계수들을 산출하였고 이를 이용하여 반응조 설계가 가능하도록 하였다.

다국어 초록 (Multilingual Abstract)

As waste water amounts increase due to the recent rapid development in the city and industry, population increase, and improvement of living standards, water pollution is being accelerated and the percentage of non-degradable organic material components in wastewater is also increasing. Especially removal of nitrogen and phosphorus is on the rise as a big assignment and therefore, improvement of this problem remains to be an important issue. Therefore, in this study, a pilot - plant experiment was conducted to improve the nitrification, denitrification and phosphorus removal efficiency by using MASA (Modified ASA system) system where MAB (Membrane Attached Biofilm) is applied to ASA: Advanced Step Aeration. And evaluation of dynamic interpretation about organic materials and nitrogen generation amount was conducted. Calculated results of dynamic coefficients in MASA system showed 1.56 mgN/gMLVSS·hr of KN in aerobic-1 reactor, 0.66 mgN/gMLVSS·hr of KN in aerobic-2 reactor, 1.09 mgN/gMLVSS·hr of KDN in anoxic reactor respectively. Regarding nitrification efficiency in NASA system at the lowest temperature of 14.1℃, KN value in ASA system was 0.98 mgN/gMLVSS·hr and KN value in MASA system was 1.56 mgN/gMLVSS·hr, which showed nitrification efficiency increased by 37.17%. Reaction coefficients were drawn using material balance theoretical equation about the nitrogen could be practically applied in the design.

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