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유기성 폐자원을 이용한 외부탄소원 적용시 질소제거 특성 변화에 관한 연구
오현일,정진도,조경환 (사)한국열환경공학회 2022 열환경공학 Vol.17 No.1
Waste water emitted from industrial facilities is increasing in relative inorganic content along with a decrease in the amount of organic matter every year, making it difficult to remove nutrients caused by high concentrations of organic matter in the early stages of wastewater treatment. In the wastewater treatment process, the denitrification process for nitrogen removal requires organic carbon as an electronic donor, so the addition of external carbon sources is necessary, but there is a concern of increased cost, obstruction of nitrification of residual organic carbon sources. The external carbon sources used for denitrification can include methanol, ethanol, and wastewater, which have been studied in various ways. However, failure to properly use these sources of external carbon can lead to a decrease in denitrification efficiency, which can lead to increased COD(Chemical Oxygen Demand), resulting in deterioration of water quality as well as a decrease in nitric oxide efficiency. Therefore, the purpose of this study was to investigate the nitrogen removal characteristics of wastewater when applying wastewater, methanol, and antibiotic-announced wastewater used as an external carbon source. This study was conducted in a biological diffuse reaction tank, and the KNO3 reagent was injected to 1.4 mg/L within the reaction tank to see the denitrification efficiency, and methanol, A negative wastewater, B negative waste water, and antibiotic fermented waste were injected in the same amount. Methanol, primary treated water, and antibiotic fermented waste reduced the total solids concentration of sludge in bioreactors by 5.2%, 17.4% and 3.4%, respectively, but the total solids concentration of A food wastewater and H food wastewater was increased by 9.1% and 8.3%, respectively. In addition, the concentration of T-N(Total Nitrogen) in bio-reactor treated water decreased by 15.6% and 0.97% and 0.85%, respectively, when methanol, primary treatment water and antibiotic fermented waste liquid were injected, but T-N in A food wastewater and H food wastewater negative waste water increased by 6.7% and 2.9%, respectively. The concentration of NO3 --N in methanol, primary treated water, antibiotic fermented waste solution, A negative wastewater, and H negative wastewater was reduced by 56.4%, 9.95%, 0.85%, 11.8% and 18.3%, respectively. If organic waste resources are applied as external carbon sources in the wastewater treatment process, it is possible to supply insufficient carbon sources during the denitrification process, but the nitrogen concentration of organic waste resources can rather increase the concentration of T-N. Further research on the possibility of decomposition of nitrogen sources contained in drinking water and antibiotic fermented waste liquid in the wastewater treatment process will be conducted through continuous experiments by type of organic waste resources.
오현일,김인수,김기범 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.3
In this paper, a model reference adaptive control (MRAC) scheme is applied for the precise and robust motion control of a pneumatic system with load variation. The reference model for MRAC is designed systematically using linear quadratic Gaussian control with loop transfer recovery (LQG/LTR). The sigmoid function of inverse velocity is used to compensate for the nonlinear friction force between the sliding parts. The experimental results show that MRAC effectively overcame the limit of the PID controller when there was unknown disturbance, including abrupt load variation and model uncertainty in the pneumatic control system.
吳賢一 건국대학교 1981 學術誌 Vol.25 No.1
Die Dichtung entsteht aus der Sehnsucht nach der Wiederkehr zu dem urspru¨nglichen Wesen der Menschen. Der Grundzug der Dichtung ist als eine Phase bezeichnet, in der sich des verborgene Wesen des Ichselbstes kla¨rt. Die Erkenntnis, daβ ich Nichts bin, bird in der Dichtung ausgedru¨ckt, wie wir die menschlichen Grundeigenschaft seven. Je nach der literaturgeschichtlichen Periode habe ich dieses Thema durch die antiken Trago¨dien, Shakes-pear's Trago¨dien, Trago¨diens des deutschen Realismus, Fragmenten von F. Kafka und G. Benn, und Roman von M. Frisch.