• Journal of Korean Society on Water Environment
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• v.29 no.2
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• pp.170-175
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• 2013

Achieving very low phosphorus levels in treated wastewater will require the installation of additional treatment. Phosphorus removal experiments by chemical coagulation were carried out for the effluent of wastewater treatment plant in this study. TP (total phosphorus) or phosphate were highly related to the addition of PAC (poly aluminium chloride) which is one of the inorganic coagulants. But, organic polymer did not significantly affect the phosphorus removal efficiency. Polymer affected the flocculation of particle especially particle matter less than 10 micrometer so, the number of micro particles was decreased by polymer dose. Chlorination would not affect on chemical coagulation process and TP and turbidity could be effectively removed by the co-addition of PAC and polymer.

• Journal of Environmental Science International
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• v.1 no.2
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• pp.93.1-104
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• 1992

Because of varied functions and characteristics, water soluble polymers have lone attracted much intrest in both academic and industrial fields, especially now in pollution problems such as wastewater treatment through ployrneric flocculants. In this regard, the main objective of this study is to synthesize polymeric floccuants containning hydrophobic group in presence of the potassium persulfate/sodium thiosulfate redox system and to estimate their flocculating ability on the kaolin suspension. In order to test the flocculating power of flocculant prepared on the kaolin suspension system, turbidity of the supernatant liquid, residence time, filtration rate of flocculated samples, have additionally been measured from the flocculation experiments and analysed In comparision with the theoretical background.

• Economic and Environmental Geology
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• v.33 no.3
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• pp.239-246
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• 2000

The 3.5kHz sub-bottom profiling was carried out over both Gwangyang Bay and the Yeo Sound . High -resolution digital images of uppermost sediment layers are obtained from the field data which were originally recorded in analog mode. Most prominent feature along the acoustic profiles is the chaotic reflections which imply the presence of shallow gas within the silty sediments. In the western part of Gwangyang Bay, the gas-charged sediments are assoicated with the acoustic turbidity of the blanket type. Across the Seomjin Delta in the eastern part of Gwangyang Bay, the gas-charged seismic facies are observed just beneath the sea bottom. In the western Yeoul Sound , the gassy seiments occur widely , whereas it is rare in the eastern counterpart with the <30-m-deep channel. We postulate that this gas was biogenetically produced within the organic-rich deposits.

• Journal of Environmental Impact Assessment
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• v.20 no.4
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• pp.575-583
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• 2011

In this study, the plausible grid size was estimated to increase for efficiency of reservoir management using 3 dimensional water quality model. To validate utilization of a real time water quality management tool, ELCOM-CAEDYM model was applied to Soyang reservoir in korea. 100m grid size can represent the real topography and take out exact analysis results. $400{\times}400m$ grid can be easily used to analysis because of data capacity. Consequently, the grid size of 200m or 300m was recommended to establish 3D model considering the required simulation time and the irrelevance between horizontal grid size and vertical distribution for temperature and turbidity analysis.

• Korean Membrane Journal
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• v.11 no.1
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• pp.15-20
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• 2009

The periodic water-back-flushing using permeate water was performed to minimize membrane fouling and to enhance permeate flux in tubular ceramic ultrafiltration (UF) system for Gongji stream water treatment in Chuncheon city. The filtration time (FT), which was the water-back-flushing period, 2 min with periodic 15 sec water-back-flushing showed the highest value of dimensionless permeate flux ($J/J_o$), and the lowest value of resistance of membrane fouling ($R_f$), and we acquired the highest total permeate volume ($V_T$) of 6.35 L. Consequently FT 2 min at back-flushing time (BT) 15 sec could be the optimal condition in advanced UF water treatment of Gongji stream. Then the average rejection rates of pollutants by our tubular ceramic UF system were 99.4% for Turbidity, 31.8% for $COD_{Mn}$, 22.6% for $NH_3$-N and 65.9% for T-P.

• Journal of Korean Society of Water and Wastewater
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• v.19 no.3
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• pp.295-300
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• 2005

The performances of electroflotation (EF) on the thickening of activated sludge were investigated using laboratory scale batch flotation reactors. Four activated sludges including bulking sludges were tested. After 30minutes of EF operation, 57-84 % of sludge volume reduction could be achieved by EF, while only about 1.5-14% could be obtained by gravity thickening for the same period. After thickening the effluent water quality in terms of TCOD, SS, and turbidity was improved by EF operation for all sludge samples. It is induced that the air bubbles entrapped in the thickened sludge play a key role in the observed improvement of sludge thickening and effluent quality.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.441-444
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• 2014

공장 사업장 등에서 발생되는 매연은 대기오염의 원인이 될 뿐만 아니라 인체에도 나쁜 영향을 미친다. 따라서 대기오염방지를 위해 배출되는 대기오염물질을 측정하고 이를 관리하여 대기오염을 신속히 파악하고 사전에 방지하기 위한 서비스가 필요하다. 본 논문에서는 광학센싱을 이용해 굴뚝연기의 혼탁도를 측정하고 이를 다양한 모바일 운영체제에서 측정결과를 실시간으로 검색할 수 있는 모바일 웹앱을 설계하고 구현한다. 구현된 시스템에서 사용자는 다양한 모바일기기를 이용하여 굴뚝연기의 혼탁도와 VOC 오염도에 대하여 여러 가지 조건으로 검색할 수 있으며 사용자 정의값을 설정하고 이를 초과하는 경우에 지정된 번호로 알림 서비스를 제공 받을 수 있다. 또한 모바일 운영체제에 독립적인 웹앱의 형태로 제공되어 사용자의 다양한 모바일 기기에서 운영될 수 있으며 실시간으로 유지보수를 제공할 수 있는 장점이 있다.

• Korean Journal of Food Science and Technology
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• v.18 no.2
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• pp.93-97
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• 1986

Dried barley moodle was made with the addition of gelatinized corn flour as binder by using piston type noodle piston press, in which the temperature was kept below the temperature of protein denaturation. The evacuation of air bubble from the dough strengthened the wet noodle strands and improved the cooking quality of the dry noodle. Although the binder was indispensable, the addition should be less than 20%, because the gelatinized corn flour increased the turbidity of the cooking water. Kneading with 3% solution of soy protein resulted in improvement of the noodle's cooking quality.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2004.04a
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• pp.151-154
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• 2004

Despite of the excellent properties of carbon nanofiber, The properties of carbon nanofiber filled polymer composites were not increased largely. The reason is that it is still difficult to ensure the uniform dispersion of carbon nanofiber in a polymer matrix. In this study, For improvement properties of carbon nanofiber filled epoxy composites, the effect of dispersion was investigated. The compounds were prepared by two methods, solution blending and mechanical mixing. Mixing of solution blending method was used using ultrasonic. Dispersion of carbon nanofiber was observed by optical microscope and scanning electron microscope (SEM). UV adsorption and turbidity measured by UV spectrometer was used for the comparison of dispersion of carbon nanofiber.

• Archives of Pharmacal Research
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• v.19 no.1
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• pp.12-17
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• 1996

Our previous studies demonstrate that menadione (MEN) is cytotoxic to platelets of rats by depleting glutathione (GSH). In order to clarify whether GSH has a role in protecting against menadione-induced cytotoxicity, the effect of GSH depletors as well as GSH precusors on menadione-induced cytotoxicity was investigated. Cysteine and dithiothreitol (DTT) prevent MEN-induced cytotoxicity in a dose-dependent manner, as determined by LDH leakage and change in turbidity. When platelets were treated with 1-chloro-2,4-dinitrobenzene (CDNB) and diethylmaleate (DEM), both of which deplete intracellular GSH, MEN-induced cytotoxicity was potentiated in the CDNB-treated paltelets, but not in the DEM-treated platelets. These data suggest that the GSH in platelets plays an important role in protecting against cytotoxicity induced by menadione.