양돈폐수에의 응집제 적용 효과 고찰

강선홍 한국폐기물자원순환학회 2002 한국폐기물자원순환학회 학술대회 Vol.2002 No.1

2002년도 춘계 학술연구발표 논문집 : 포스터발표 ; 양돈폐수에의 응집제 적용 효과 고찰

강선홍 한국폐기물자원순환학회(구 한국폐기물학회) 2002 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2002 No.-

Phosphorus Release from Sediment in Lake Sihwa and its Control

강선홍 한국물환경학회 2002 한국물환경학회지 Vol.18 No.2

In this study the effects of initial pH, temperature, dissolved oxygen concentration, and sediment depth on the release of phosphorus from sediment in Lake Sihwa were investigated. No phosphorus release occurred at 10 ℃ for all pH values. DO concentrations were decreased and equilibrium was obtained 4-8 days after phosphorus release started. The DO concentrations were less than 1 mg/L. Sediment depth had little effect on phosphorus release rate. In order to control the released phosphorus, raw sludge and chalk were used. Results showed that a portion of phosphorus was removed by adsorption to chalk and raw sludge. About 90 % phosphorus removal was observed using sludge and calcinated chalk from the water sample in Lake Sihwa.

토양내에 존재하는 석유제품의 거동에 관한 고찰

강선홍,최상일 ( Seon Hong Kang,Sang Il Choi ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.2

Prior studies at Iowa State University tend to indicate that petroleum products such as gasoline, diesel fuel, and crude oil can be removed from soil by bioremediation. These studies also indicate that gasoline would largely be removed by volatilization and that diesel fuel would not. In order to investigate volatilization as a competing process for the removal of fuels with bioremediation, the movement of gasoline in the sand was investigated and a model based on a material balance was developed to predict the evaporation of petroleum products from contaminated sand. The results show that the fuel was drying out from the top down and at the level where the liquid fuel is found, the air in the pore space in the sand is saturated with fuel vapor. Diffusion moves the vapor to the surface of the sand where the flow of air maintains the fuel vapor concentrations near zero. The model explains that the evaporation pressure is an important factor and why the rate of volatilization of gasoline is much higher than that of diesel fuel.

2000 년도 공동추계 학술발표회 / 폐수처리 (2) : 소규모 양돈폐수처리에 관한 연구

강선홍,박영준 대한상하수도학회 2000 공동추계 학술발표회 논문집 Vol.2000 No.-

Thiobacillus ferrooxidans 를 이용한 광산폐기물내의 중금속 용해에 관한 기초연구

강선홍,최상일 ( Seon Hong Kang,Sang Il Choi ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.2

Zinc metal and zinc sulfide were recovered by oxidative dissolution using Thiobacillus ferrooxidans, which is aerobic, autotrophic, and acidophilic bacteria. Thiobacillus ferrooxidans derive energy from oxidation of ferrous iron and elemental sulfur using molecular oxygen as an electron acceptor. From the 10,000㎎/L of initial zinc concentration, 97% solubilization of zinc metal was obtained from coarse FeS₂ due to microbial action. Also, about 70% metal solubilization occurred with fine sized materials in 58days. The general trend observed for the ZnS systems was a decrease in pH with time. The pH drop is an indication that microorganisms are acclimating and producing acidic by-products. The iron oxidation state changes due to substrate containing coarse particle size FeS₂ was shown. The sharp drop of ratio of Fe(II)/Fe(Total) and sharp increase of ratio of Fe(III)/Fe(Total) was observed in 20days after inoculation. Thus, microbial activity began more rapidly for the coarse particle size substrate than for the fine FeS₂.

혐기성 순차 회분조를 이용한 폐수처리에 관한 모델링

강선홍 광운대학교 신기술연구소 1997 신기술연구소논문집 Vol.26 No.-

본 논문에서는 Monod 식을 이용하여 폐수내의 유기물질의 제거 기작을 수학적으로 도출한 뒤 graphical method를 이용하여 시간에 따른 기질의 농도를 예측하여 현장에서 ASBR을 설계·적용하는 데 기초적인 도움이 되고자 하였다. 기질의 농도 측정값과 모델에 의한 이론적인 계산 값들을 비교한 결과 실측값과 이론 값들이 잘 일치함을 볼 수 있었고, 따라서 Monod식에 근거한 모델이 적절하게 시간 경과에 따른 기질의 농도변화를 예측함을 알 수 있었다. Many researchers have been conducted on the biological treatment of wastewater using anaerobic sequencing batch reactor (ASBR) system. However, nothing has been done to mathematically describe the substrate removal kinetics to date. To apply ASBR system into the real field, the understanding and knowledge on the microbial growth, activity, and substrate removal phenomenon are required. Therefore, the main objective of this research is to attempt to mathematically describe the substrate removal kinetics using Monod expressions and to predict the substrate concentration changes with respect to time.

초강천의 퇴적물 분석을 이용한 총인 및 질소의 유달 특성 평가

강선홍,서동일 대한상하수도학회 1997 상하수도학회지 Vol.11 No.4

To estimate the nutrients delivery characteristics of Chogang stream to Keum River, sediment, and soil characteristics were analyzed in the stream and in the stream bank. Along the stream, soil samples from river sediment were collected and tested monthly for phosphorus and nitrogen concentrations. Nitrogen concentration in the sediment is much lower than that of soil in the river bank especially in summer presumably due to the high desorption characteristics of nitrogen by the increasing rainfall energy during summer. Instead, the concentrations of phosphorus were similar for the sediment and the soil in the river bank due to the strong adsorption characteristics of phosphorus. Batch tests were performed to evaluate the desorption potential of the sediments. Universal Soil Loss Equation (USLE) was applied to quantify soil erosion in each watershed due to rainfall. It was estimated that approximately 25% of total phosphorus by mass basis could be released from the sediment if the water was disturbed vigorously. The mass load of nitrogen and phosphorus into the Chogang Stream from the watershed were evaluated from the USLE and release ratio of phosphorus.

호수내의 인 제거에 관한 연구

강선홍,김경태 대한상하수도학회 1998 상하수도학회지 Vol.12 No.2

The feasibility of usage of sludge from water treatment plant and chalk from schools and institutes was investigated to remove the phosphorus in the lakes which induce the eutrophication every year. In this study phosphorus removal efficiencies of sludge an chalk were investigated by changing various factors. Higher phosphorus removal efficiency using larger particle size of chalk was observed which means that the surface area is not an important factor in removing phosphorus in aqueous phase. The proper shaking time and temperature were 2 hours and 25℃, respectively. The removal efficiency using sludge from water treatment plant was almost 100%, which is similar to those of CaO and Ca(OH)_2. It means that sludge can be reused in removing phosphorus. It was also found that chalk was better in removing phosphorus under alkaline condition and sludge was better under acidic condition. About 75% phosphorus removal efficiency was observed using sludge from the water sample in Lake Sihwa.

수중의 인 제어기술 개발

강선홍,김경태 대한상하수도학회 1999 상하수도학회지 Vol.13 No.3

In this study the feasibility of usage of raw sludge (sludge from water treatment plant) and chalk from schools and institutes was investigated to remove the phospho-rus in water and wastewater. In this study phosphorus removal efficiencies of sludge and chalk were investigated by changing various factors. The time to reach the equi-librium using chalk and raw sludge under different pHs was obtained. Based on this result, Freudlich adsorption isotherm was applied. Results showed that a portion of phosphorus was removed by adsorption to chalk and raw sludge. The phosphorus removal efficiency using calcingted chalk was about three times higher than that of chalk. It means that some portion of CaCO3 contained in chalk was converted to CaO by calcination and this was proved by X-ray diffraction experiment. About 90% phos-phorus removal was observed using sludge and calcinated chalk respectively while about 20% phosphorus removal efficiency was achieved using chalk from the water sample in Lake Sihwa.