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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.
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.
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.
강선홍,이정엽 대한상하수도학회 1999 상하수도학회지 Vol.13 No.2
In this study small glass columns with 2.5cm inner diameter and 24.5cm length were used as many as the sample numbers to study the effects of initial pH, tempera-ture, dissolved oxygen concentration, and sediment depth on the release of phospho-rus from lake sediment. No phosphorus release occurred at 10℃ with all pHs, and release rate at 25℃ was higher than that at 35℃ with pH 4and reverse trends were obscrbcd at pH 7 and 10. Under all conditions, DO concentrations were decreased and equilibrium was obtained after 4-8 days when phosphorus release started and the DO concentrations were less than 1mg/l sediment depth had little effect on phosphorus release rate. It was found that relation hetween released SRP(Soluble Reactive Phosphorus) concentration and time was zero order reaction and reaction rate coefficients were obtained. The amount of phosphorus release from lake sedi-ment can be predicted by considering thess k values.
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.
강선홍,장재구,가순규,김현영,김상돈,이면주 대한상하수도학회 2012 상하수도학회지 Vol.26 No.3
Antibiotics have been issued recently in water environments because of potential impacts on ecosystem and public health. This study was aimed to investigating the degradation of antibiotics such as tetracycline, lincomycin, sulfamethazine and cephradine using gamma ray irradiation. And the toxicity before and after irradiation on antibiotics was tested in order to examine the aquatic eco-risk assessment by aquatic organisms. In addition, comparing tests on toxicity for gamma ray and UV irradiated antibiotics was conducted. Four different antibiotics were prepared by concentration of 30 mg/L with demi-water respectively. The absorption dose of gamma ray was ranged from 0.2 to 2 kGy. The concentration of four antibiotics was gradually decreased corresponding to the increase of the absorption dose. A method for toxicity assessment using Pseudokirchneriella subcapitata was evaluated to the most acceptable compared with methods by Daphnia magna and MicrotoxⓇ in terms of sensibility. It showed that the reduction of toxicity on antibiotics treated by gamma ray was superior comparing to the test results obtained from UV treatment. By-products from antibiotics treated by gamma ray were easily decomposed by microorganism and their toxicity was also evaluated to low.
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.