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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.
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.
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.
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.
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.
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.