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CMAS公法에 있어서 固定 및 回轉媒體를 利用한 染色廢水의 處理에 關한 硏究
閔庚碩,金弘泰,都仲鎬 경북대학교 산업기술연구소 1990 産業技術硏究誌 Vol.18 No.-
The purpose of the research is determination of the substrate removal efficiencies and sludge productions in complex dyeing wastewater treatment using the Fixed/Submerged Moving Media Complete Mixing Activated sludge(CMAS) process. Laboratory scale CMAS reactors were operated with the organic loading rates from 0.38 to 1.07㎏BOD/㎥/day. The sludge productions were similar in both the fixed and submerged moving media systems. During operating periods the sludge was removed periodically in fixed media system, yet not removed in submerged moving media.
김상현,박남식,김주인,정봉석,도중호 대한상하수도학회 2001 상하수도학회지 Vol.15 No.3
The characteristics of unsteady pipe flow to an external impact such as valve modulation can be detected in a frequency domain. Fast Fourier Transformation is employed to convert the head variation in the time domain to the amplitude of the frequency domain. Application of the method of characteristics to a pipeline provides a range of frequency representing a particular unsteady condition. Inverse Fast Fourier Transformation and a Finite Impulse Response Filter can be used to remove noise present in the frequency range. Characteristics of the frequency range for various conditions such as valve modulation and a minor modification of a pipeline are explored to demonstrate the effectiveness of the noise control method in the frequency domain. A noise contaminated signal was successfully filtered using a low pass filter, which was designed from a frequency analysis of head variation.