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분뇨의 감압증발법 처리과정에서 발생한 응축수의 생물학적 처리에 관한 연구
황규대,정원식,김복현 ( Gye Dae Whang,Won Sick Chung,Bok Hyun Kim ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.1
Depressurizing evaporation process was developed for the treatment of night soil. It is a compact treatment process, and can be built in a small area without malodor generation. However it produces condensate which contain high concentration of organic material and ammonia nitrogen. This study was performed to determine the optimum treatment conditions for the activated sludge and rotating biological contactor process, which were selected as secondary treatment unit for condensate. Six bench scale activated sludge units and rotating biological reactors were operated. Three units received undiluted wastewater and the remaining three units received wastewater diluted with tap water. The dilution ratio was 1 : 1. Test results indicated that the activated sludge unit which received diluted wastewater and was operated 12hours of HRT and l0days of SRT produced the best quality of effluent. The SCOD and NH₃-N removal efficiency were 95% and 18%, respectively. The kinetic coefficients, yield coefficient(Y), and decay coefficient(Kd), were 0.251㎎MLSS/㎎COD and 0.121day ¹, respectively. For RBC process, the unit received diluted wastewater and was operated with hydraulic loading of 30 liter per day produced the best quality of effluent. The SCOD and NH₃-N removal were 90% and 38%, respectively.
한두희,김복현 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-
안경렌즈는 유리를 연마하여 제작하거나 단량체를 세라믹 금형에 넣어 캐스팅공법으로 플라스틱 렌즈를 만드는 것이 일반적인 방법이었다.한편 사출성형에 의한 렌즈 및 안경의 제작은 광학적으로 우수한 재료 및 금형을 개발하지 못하여 국내에서는 시도조차 못하는 형편이다.구미나 유럽의 일부 국가는 PMMA 및 PC를 이용하여 안경 및 안경렌즈를 개발하고 있으며, 이는 공정을 대폭 줄이기 때문에 대량 생산 및 원가절감을 이룩할 수 있다.본 연구에서는 PMMA 및 PC를 이용하여 그동안 성형할 때에 가장 문제가 되었던 오목 렌즈를 제작하기 위한 금본적인 금형 설계의 문제점 해결과 이를 이용한 일체형 안경과 고강도 렌즈의 제작을 고찰하였다.
1차 침전지가 없는 활성슬러지 공정의 동력학 계수 및 슬러지 생산량에 관한 연구
황규대,김복현,정윤진,조종복 한국물환경학회 1993 한국물환경학회지 Vol.9 No.4
The study was carried out to determine the kinetic coefficients and optimum treatment conditions and to evaluate the mass balance for sludge production in activated sludge process without primary clarifier. Eight bench-scale activated sludge units were operated under different operating conditions and by using incoming wastewater to two small scale wastewater treatment plants. The optimum treatment conditions were 8 hours of HRT and 8 days of SRT for $quot;A$quot; plant wastewater and 8 hours of HRT and 3 days of SRT for $quot;B$quot; plant wastewater. The calculated kinetic coefficients, sludge yield coefficients(Y) and decay coefficients (K_d) were 0.695 ㎎ MLVSS/㎎ COD, and 0.186 day^(-1) for $quot;A$quot; plant wastewater and 1.064 ㎎ MLVSS/㎎ COD, and 0.252 day^(-1) for $quot;B$quot; plant wastewater. The amount of sludge calculated by using the proposed solids mass balance model were well agreed with the amount of sludge produced from activated sludge process.
활성슬러지공정에서 철의 전기분해를 이용한 탈인에 관한 연구
황규대,김복현 한국물환경학회 1994 한국물환경학회지 Vol.10 No.4
The objective of this research was to develop and evaluate the combined physicochemical-biological process of phosphorus removal. Four bench scale activated sludge reactors were operated with domestic wastewater generated from Kyung Hee University. Iron electrodes were connected to the aeration basin of three reactors and received an electric current to produce Fe^(3+) formed by the anode dissolution process. One reactor without iron electrode was operated as a control unit. The surface area of iron electrode, phosphorus concentration in influent and operating condition of activated sludge units were changed to study the effect of electrolysis with the iron electrodes. The test results indicated that the electrolysis of iron is an effective way for phosphorus removal and the addition of iron oxide improve the substrate removal efficiency of activated sludge and sludge settling characteristics. It was determined that the effective surface area of iron electrode to obtain 80% of phosphorus removal was 30㎎P/㎠ iron electrode day, and with that condition, more than 90% of TCOD and TSS removal efficiency could be accomplished. It seems that the electrolysis with iron electrode did not affect the biological kinetic coefficients. The obtained yield coefficient(Y) and decay coefficient(K-d), were 0.64㎎MLSS/㎎COD and 0.19day, respectively and were approximately same as the value of conventional activated sludge process.
정윤진,황규대,김복현,조종복,윤치웅,백성기 한국물환경학회 1993 한국물환경학회지 Vol.9 No.4
Wastes from hog farms can contribute considerable pollution loads to receiving streams because it contains high concentration of organic matters and nutrients. Therefore it is required to discharge after proper treatment. The objective of this study was to determine the optimum treatment conditions and to evaluate design parameters for a swine wastewater treatment plant. Three bench scale activated sludge units and two rotating biological contactor units were operated by using swine wastewater. Settling characteristics of suspended solids were very poor, and after 2 hour settling time, removal efficiency of organic matters and suspended solids were about 15% and 23%, respectively. Among the coagulants treated to improve the settleablity of suspended solids, ferric chloride showed the best result at dose concentration of 525㎎/ℓ. The activated sludge unit operated at 6 hours of HRT and 16 days of SRT produced the best quality of effluent. The kinetic coefficients, yield coefficient(Y₁), and decay coefficient(k_d), were 0.32㎎ MLSS/㎎ COD and 0.079 day ^(-1), respectively. RBC process showed about 90% SCOD and 86% TKN removal efficiency. The hydraulic loading did not affect the SCOD removal efficiency significantly. The kinetic coefficients, loading rate(P) and substrate saturation constant(Ks) were 13.7g SCOD/㎡/day and 32.7㎎ SCOD/ℓ, respectively for SCOD removal, and 0.73g TKN/㎡/ day and 25㎎ TKN/ℓ, respectively for TKN removal. Experimental results indicated that RBC process required much larger area than activated sludge process to produce the same quality of effluent.