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SBR의 운전주기 변화에 따른 C, N 및 P의 제거특성
엄태규,최연돈 慶星大學校 環境問題硏究所 1998 環境硏報 Vol.8 No.1
In this study, SBR process,known as a suitable process for the treatment of N and P, was used to enqluate the removal of organics, nitrogen and phosphorus at various operation cycle. The operating conditions were as follows ; 150 minutes of aeration, 80 minutes of anoxic, 80 minutes of aeration, 80 minutes of anoxic, 70 minutes of aeration, 80 minutes of anoxic, 100 minutes of aeration, 80 minutes of anoxic, 70 minutes of aeration, 80 minutes of sedementation and withdrawal, continuously in the Run l. 150 minutes of aeration, 60 minutes of anoxic, 70 minutes of aeration, 60 minutes of anoxc, 60 minutes of aeration, 80 minutes of sedementation and withdrawal in the Run 2. The results obtained from the experiments were as follows ; In the first aeration step of Run 1,oxygen consumption rate was lower than value of Run 2. Oxygen consumption rate was decreased as the aeration step. Influent COD concentration was about 500㎎/ℓ for the experimental period. Effluent COD concentration were 25.0 and 32.5㎎/ℓ. Influent ammonia nitrogen concentration was 66.2㎎/ℓ in the Run 2, Effluent ammonia nitrogen concentration were 28.0 and 36.0㎎/ℓ. Also, nitrifying rates were 55.7 and 45.6% Residual nitrite concentration was 0.5㎎/ℓ. Nitrite concentrations were 18.0 and 13.5㎎/ℓ. Total nitrogen removal rates were 30.3 and 24.5%.
하수관거의 침투수/유입수(Ⅰ/Ⅰ) 특성에 관한 연구 : 경남 H군을 중심으로
김종오,최연돈,박희철 경상대학교 생산기술연구소 2002 工學硏究院論文集 Vol.2 No.-
Infiltration/Inflow(I/I) is the major deterrent to the successful performance of the municipal sewer and the treatment system. An excessive I/I in the combined sewer system can hydraulically overload the sewer lines and the wastewater treatment plants. The purpose of this study was to investigate and analyze the I/I characteristics in order to evaluate the sewer system in the rural study area. Eight sub-catchments of the combined sewer system were monitored during two months for flowrate, pH, DO, SS, BOD, COD_Mn, COD_cr, T-N, T-P. As the results, the variations in wastewater flows were basically following a diurnal flow pattern. Minimum flows occured during the early morning hours when water consumption was lowest and when the base flow consisted of infiltration and small quantities of wastewater. The first peak flow occured in the late morning just after the peak morning water use. A second peak flow generally occured in the early evening. The I/I were related to the type of area existing in the sub-basin. During a dry weather period, the I/I were observed to be 22~70% of the average flow. Based on the results of investigation, the repair priority of the sewer system was showed according to the average I/I per the average wastewater flowrates and the I/I per drainage area.
김종오,최연돈,김홍철 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-
The purpose of this study was to develope the economical sewage treatment technology using oyster shells as biological contact media. As the stage of feasibility test in laboratory scale, the new submerged media processes with media-filling ratios of 20% and 55% were compared with the conventional activated process. Comparison parameters were the performance characteristics such as organic, nitrogen, phosphorus removal efficiencies. Operating conditions in terms of hydraulic retention time varied at 12 hr, 10 hr, and 8 hr. The results were as follows; 1.Removal efficiencies of organics such as BOD and COD showed almost the same in activated sludge and submerged oyster shell processes. The different filling ratios in submerged process showed also the same organic removal characteristics. 2.Nitrogen removal efficiencies showed that the submerged oyster shell process were better than activated sludge process. However, the different filling ratios in submerged process showed almost the same nitrogen removal characteristics. 3.Phosphorus removal efficiencies showed almost the same in activated sludge and submerged oyster shell processes. The increasing filling ratios in submerged process showed the little improvement of phosphorus removal efficiency.
QSAR 을 이용한 지방족 할로겐화합물 흡착 및 탈착 계수의 예측
김종오,박증석,최연돈 한국환경과학회 2002 한국환경과학회지 Vol.11 No.7
Sorption and desorption is an important phenomenon to determine the fate of halogenated aliphatic hydrocarbons in the aqueous phase. This study was conducted to develope a predictive equation capable of estimating the sorption and desorption potentials of halogenated aliphatic hydrocarbons onto the sludge from activated process, sediment, and clay. It has shown that the sorption and desorption parameters can be accurately estimated using Quantitative Structural Activity Relationship(QSAR) models based on molecular connectivity indexes of test compounds. The QSAR model could be applied to predict the sorption and desorption capacity of the other halogenated aliphatic hydrocarbons. The QSAR modeling would provide a useful tool to predict the sorption and desorption capacity without time-consuming experiments.
지방족 할로겐화합물의 활성슬러지와 해안저질 및 점토에서의 흡탈착 특성
김종오,박증석,최연돈 한국환경과학회 2002 한국환경과학회지 Vol.11 No.9
This study was performed : 1) to establish the experimental analysis conditions for the sorption and desorption of toxic organic contaminants to/from the activated sludge, sediment, and clay, and 2) to determine the sorption and desorption equilibrium coefficients of some representative halogenated aliphatic compounds. Through the preliminary sorption test using Azo dye, a setting of quantitative experimental conditions to determine the sorption and desorption characteristics was decided as follows; equilibration time of 180 minutes, centrifuge for 15 minutes at 5000×g, and 500㎎/ℓ of TOC concentration. The sorption and desorption characteristics of halogenated aliphatic compounds onto activated sludge, sediment and clay could be described very well using the Freundlich isotherm. The preference of the average sorption capacity of the overall compounds showed in the sequence sediment 0.26㎎/g, clay 0.23㎎/g, and activated sludge 0.11㎎/g. The desorption rate of the sorbed compounds onto activated sludge, sediment and clay was approximately 89.8%, 35.3%, and 66.4%, respectively.