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姜龍太,李容斗 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-
The main objective of this study was, at first define the effects of dewaterability on concentration dewaterability on difference of chemical composition. For this purpose, experimented on apparatus of gravity dewatering in laboratory. The results of the experiment are the following. 1.The ratios of silica to alumina were eavh 0.899, 0.641 in the water plant sludge in Busan city.(Hwamyeong, Myeong jang) Also, because of water qality changes for the worse, quantity of organics were checked high value. 2.As a result of analysis on filterability in different concentration showed that concentration was proportion to specific resistence. 3.The ratios of silica to alumina were inverse proportion to specific resistence. 4.As a result of analysis on filtration velocity of sludge in different concentration, the optimum concentration was 4.87% for the sludge dewatering by drying bed.
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이용두 대구대학교 산업기술연구소 1986 産業技術硏究 Vol.5 No.-
A/d converters such as sweep type, sequential compared type have been used in the multi-channel analyzer of wave height. Their operational characteristics have been investigated and the sequential compared type has been designed in order to make up for the defects of low-speed conversion in sweep types. The construction of logic circuit has been established and the values in practice of the circuit elements have been computed and experienced for its purpose. The use of metal thin-film resistors reult in reduction of its errors and conversion time.
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이용두,허목 제주대학교 환경연구소 1995 환경연구논문집 : 제주대 Vol.3 No.1
With the increased awareness of the impact of c.lhinated crganics in sewage effluent on reoeiving waters, the trend toward mverting wastewater disinfectrm to Ultraviolet systems is expanding Ultraviolet Disinfection system have many merits At examples no addition of chemicals and no effect on air or aquatic life. So that, in this pilot study was conducred at the Cheju and Suyeong Sewage Fanility to investigate the use of ultradet radiah for disinfectbn of the hated wastewater. The mainly objectives of these tests are to find out effidency by operating factors and water qualities. As a results, When SS of effluents were 3~6㎎/l, effiaenaes were always over 99%. And also, when HRTs were 11-146 sec, efficiencies were usually over 99 %.
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이용두,고인범,김현희 제주대학교 해양연구소 1997 해양자원연구소연구보고 Vol.21 No.-
This study was performed to investigated the removal efficiency of BOD and SS from the retreated water of sewage effluent by upflow filtration system. Flow rate of sewage effluent were 80m/day. 150m/day. 200m/day and 300m/day. The removal rate of SS was above 90%. and independent on the flow rate. However. BOD removal rate decreased with the flow rate increase. And removal rate of BOD was 40-60%. In the results of experiment, it was considered that the treated water was possible to use as the graywater because it was suitable to Flush Toilet, Springkle -Water. Cleaning Car. etc.
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이용두,김창영 제주대학교 해양연구소 1998 해양자원연구소연구보고 Vol.22 No.-
Ozone is a relatively new water quality management tool in the green industry and a powerful oxidizer and sterilizer. This study was conducted to investigated water quality improvement by ozone doze. The results obtained are summarized as follows : 1. SS dropped 58% in Lab test and decreased 77% of SS field study. 2. The removal efficiency of chlorophyll-a is about 90% at 50mg/ℓ of ozone doze. 3. Improvement transparency is increased about 18cm(or degree) with 10mg/ℓ ozone delivery in Lab test. But improvement of transparency is increased 50cm after 30 days of ozone in full scale test. 4. TOC removal rate was 80% in Lab test with 0.25g/l/hr ozonization during 150min.
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이용두 한국지하수토양환경학회 2001 지하수토양환경 Vol.5 No.3
본 연구는 제주도의 전체 지하수공 중 수역별로 대표성이 있는 150공을 선정하여 고도에 따른 수질 특성을 파악하는데 목적을 두었다. 수질특성의 평가는 물리.화학적 특성과 통계분석을 이용하였다. Piper diagram에 의한 수질 유형은 표고 50m이하 지역은 $Na^{+}$+ $K^{+}$-C $l^{-}$ 형태를 보이고 있다. 40~100 m에 위치한 지하수에서는 $Na^{+}$+ $K^{+}$-HC $O_3$$^{-}$ +C $O_3$$^{2-}$ 형태와 일부 $Na^{+}$+ $K^{+}$-C $l^{-}$ 형태의 군을 이루고 있다. 그리고 100 m이상의 지역에서는 $Na^{+}$+ $K^{+}$-HC $O_3$$^{-}$ +C $O_3$$^{2-}$ 형태에 속하고 있다. 요인분석 결과, 50 m이하와 100 m이상 지역에서 공통적으로 TDS와 오염물질 2개 요인이 추출되었다. 50~100m지역에는 3개의 요인이 추출되었으며, 요인1에는 TDS함량으로 요인2는 오염의 영향과 광물용해로 볼 수가 있다. 그리고 요인 3에는 HC $O_3$$^{-}$ 함량으로 나타났다.. This study purpose to elucidate the characteristics of water quality by elevation and groundwater samples has been studied with the samples from 150 selected groundwater represented the watershed of groundwater wells in Cheju Island. The evaluation of the characteristics of water quality utilized the physical and chemical property and the statistical analysis. According to the piper diagram, groundwater in the under 50 m region is shown N $a^{+}$+ $K^{+}$-C $l^{[-10]}$ type, and that groundwater in the 50~100 m region is shown N $a^{+}$+ $K^{+}$-HC $O_3$$^{[-10]}$ +C $O_3$$^{2-}$ type. and partly N $a^{+}$+ $K^{+}$-C $l^{[-10]}$ type. In the above 100 m region belongs to N $a^{+}$+ $K^{+}$-HC $O_3$$^{[-10]}$ +C $O_3$$^{2-}$ type. The result of factor analysis, commonly two factors as TDS(Total Dissolved Solid) and the contaminants extracted in the under 50m region and above 100 m region. Three factors were obtained from the result of the factor analysis in the 50~100 m region. Factor 1, consisting of TRS content. Factor 2, consisting of the contaminant and the dissolution of minerals. and Factor 3, consisting of HC $O_3$$^{[-10]}$ content. content.
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이용두,함진규 제주대학교 환경연구소 2000 환경연구논문집 : 제주대 Vol.8 No.-
Based on the analysis and findmgs of the continuative measurement of the groundwater level data on three observation wells located at esatem part in the mid-mountain area, Jeju Island, the purpose of this study was to clarify the fluctuation characteristics of groundwater level response to rainfalls and groundwater recharge rate in the study area. According to the analysis of the groundwater levels rising with responses to rainfalls, it showed that began to rise between the 7th and 13th days after the rainfall, and then, continued to go up with the value of 1.9m to 8.3m for 15 to 16 days. This result suggested that infiltration occurs slowly in the recharge area rather than the coast area. Based o n the value of both the amount of net groundLvater recharge and infiltration rate; the recharge rate of well I is high with the amount of 32 % under the groundwater level is below 85m, the recharge rate of well II is 65% under the level is below 90m, the recharge rate of well Ill is 50% under the level is below 85m . This result shows that when the groundwater level rises above a certain level, the rising amount of level becomes low in spite of heavy rain.
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