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This study was conducted to remove the dissolved humic acid which is well known as precursor of trihalomethanes(THMs) by ozone oxidation, coagulation. In this study, ozone oxidation and coagulation process were not effective to remove the dissolved humic acid. But with pre-ozonation, THMFP and CODCr were removed 85% and 83% respective. When ozone oxidation was applied to remove the dissolved humic acid, ozone oxidation by-products such as Formaldehyde, Acetaldehyde, Pentanal and Methyl glyoxal were generated, and in experiments of the disinfection by-products by the chlorination, only THMs were generated.
In order to reduce the pollution load from the livestock farms and to improve the water quality of the effluent in livestock wastewater, the electrolysis system is introduced. For the selection of optimal electrode, various combination of electrodes such as carbon, A1 and Fe were examined. In this study, electrode material, electrolyte concentration, electrode distance, current density, and pH value were found to have significant effect on both pollutant removal efficiency and current efficiency in electrochemical oxidation process. After electrolysis for 90 min with carbon/Al, it was observed that COD, T-N, T-P and NT₄+-N of livestock wastewater were removed with 80%, 61%, 81% and 87%, respectively.
본 연구는 SBR 변법을 이용한 생물 반응공법을 이용하여 생활하수에 대한 생물학적 유기물과 영양소 제거 특성을 검토하였다. 전체 운전기간 동안 COD, BOD 및 SS의 평균 제거율은 90%, 94% 및 98%의 제거효율을 나타내어 안정적인 유기물 제거가 가능하였다. TN 제거효율은 63%로 매우 낮게 나타났으며, 제거효율 개선을 위해서는 단위공정의 배열을 변경하거나, 후탈질 공정의 도입이 필요할 것으로 판단되었다. 전체적인 인 제거 효율은 78%로 나타났으며, 회분식 혐기조로 반송되는 슬러지의 양을 조절하여 제거효율을 향상시킬 수 있을 것으로 판단된다. The purpose of this study is to clarify the removal efficiency of containing textile wastewater by coagulation at each test conditions. The COD concentration was reduced after coagulation compared with raw water. The average of COD concentration after coagulation was 150mg/L. And also, after coagulation, the SS concentration was reduced 64% compared with raw water. The variation of water quality after coagulation was similar to raw water.
본 연구에서는 물가상승 요인에 따라 공공하수처리시설의 운영비의 절감을 위해 기존 처리시설 운영개선을 통한 원가절감과 처리효율향상에 대해 알아보았다. DOF Process의 연간제거율은 강화된 수질방류기준을 만족하였다. DAF와 DOF의 처리효율을 비교해본 결과 대장균을 제외한 다른 항목에서는 큰 차이를 보이지 않았다. Alum 주입 시와 미주입 시의 처리효율을 비교해본 결과 T-P와 대장균을 제외한 나머지 항목에서는 큰 차이를 보이지 않았고 Alum 주입 시 T-P와 대장균의 제거효율이 증가하였다. DAF운전조건에서 Alum을 주입하였을 시 대장균의 제거율은 91.9%이고 DOF운전조건에서 대장균의 제거율은 94.3%이다. 대장균제거에 있어 DAF운전조건에서 Alum을 주입하는 것과 DOF로 운전하는 것은 처리효율에 큰 차이를 보이지 않았다 DAF운전만으로도 대장균외 다른 항목이 강화된 방류수질기준을 만족하므로 DAF를 주력운영방안으로 간헐적인 DOF 운전을 한다면 전력비감소에 의해 운영비 절감효과도 기대된다. In this study, we surveyed the improvement of treatment efficiency and cost saving by controling treatment facilities for wastewater. The removal efficiency in each year of DOF process satisfied the enhanced effluent standards. There was no the different throughout the removal efficiency of DAF and DOF, except coliform. The removal efficiency of coagulation was not different its non-coagulation excepting T-P and coliform. The removal efficiency of T-P and coliform was increased by the increasing of Alum concentration. The removal efficiency of coliform by coagulation was 91.9% under the DAF condition. Under the DOF condition, it was 94.3%. There was no difference between the DAF process and the DOF process of removal efficiency. Therefore, it could be decrease the electricity cost of facilities by the main of DAF process and auxiliary DOF.
Recently, sanitary landfill was one of the most widely used for disposal of waste in Korea. With increasing of use and public awareness of this method for disposal. there is an increased concern With respect to the pollution potential by the landfill leachate. Especially, an aged landfill leachate contained relatively large amount of the nonbiodegradable substances which could not be removed by biological treatment processes. So, this study was conducted to the removal of nonbiodegradable substances, such as Humic acid and Fulvic acid with the electrolysis.<br/> In this study, electrode materials, electrolyte concentration, electrode distance, current density, and pH value were found to have significant effect on both pollutant removal efficiency and current efficiency in electrochemical oxidation process.
The present time, water hyacinth(Eichhoernia crassipes) was widely used for a purification of a polluted lake, livestock wastewater and sewage wastewater treatment. This study was conducted to evaluate the propriety of sewage wastewater treatment by water hyacinth(Eichhornia crassipes). On the study of optimal cultivation density, 3 kg/m² was selected for the most suitable initial cultivation density through the BOD, T-N and T-P removal efficiency. In experiment of purification capacity, hyacinth(Eichhornia crassipes) removed the 267.2 mg BOD/kgㆍday, 72 mg T-N/kg . day and 8.6 mg T-P/kg' day at 30 operation days respectively. The result showed that hyacinth(Eichhornia crassipes) could be used for recovery of eutrophic lake effectively. In the test of optimal HRT(hydraulic retention time), 9 days was selected with the suitable HRT, and BOD, T-N and T-P were removed with 75%, T-N 88% and T-P 97% respectively.
도시환경문제로 발생된 비정상적인 도시생태계와 도시 미기후 개선을 위해서는 작은 면적의 녹지라도 조금씩 확보해 나가는 것이 시급한데, 옥상녹화는 지상에서 확보하기 어려운 녹지량을 충분히 보상할 수 있는 유일한 대안으로 여겨지고 있다. 연구결과, 옥상녹화는 설치장소별로 개인과 사회에 다양한 환경적, 심리적, 경제적 효과를 주고, 현재 가정에 조성된 옥상녹화는 생산과 가사를 위해 이용되고, 직장은 휴양의 장소로 이용되고 있다. 옥상녹화 활성화를 위하여 거주지, 직장 등 생활공간에 우선적으로 옥상녹화를 도입하기를 원하고 지자체의 재료지원과 보조금 지원을 희망하였다. 시민들이 선호하는 옥상녹화 형태는 ‘휴게공간’, 텃밭 및 화단, 화분이용, 지피식물 순이고, 젊은 층과 고소득층의 경우 ‘휴게공간’과 ‘지피식물’ 선호도가 높고, ‘화분이용’과 ‘텃밭 및 화단’ 선호율은 낮았다. Green roof is considered as the only alternative to compensate for lack of green area on the ground sufficiently. To examine revitalization plan of green roof project citizen participates in subjectively, comprehensive research and analysis on opinions of residents in Daegu have been implemented and diversified demands of residents have been identified. As a result, green roof shows environmental, psychological and economical effects on individuals and society and theses effects differ from locations. Green roof in house is used for household affairs and production, and green roof in work place is for rest area. In a method of revitalizing green roof, citizen wants living space, such as resident area and work place, to have green roof preferentially. Also they want local government to support materials and subsidy for green roof. From the result of researching the preference of green roof type, rest area topped the list and then ‘kitchen garden and flower bed’, ‘using flowerpots’ and ‘ground cover plants’ were followed. High income bracket and younger generation presented high preference on ‘rest area’ and ‘ground cover plants’, and showed low interest on ‘using flowerpots’ and ‘kitchen garden and flower bed’.
In this research, sludge was added in the brick manufacturing to reduce the clay usage and examined the plasticity, compressive strength, surface absorption and the quality of the brick with step by step addition of sludge in the raw material, and compare the results with the brick quality standard rules and regulations whether the quality is satisfaction able or not. We examined possibility of recycling waterworks sludge by combining clay, kaolin, and silica as a block. The compressive strength was observed 361.1kgf/㎠ when brick was manufactured with 75% clay and sludge 5% and 20% silica which compete the 1st grade brick standard. The compressive strength was observed 349.9kgf/㎠ when 70% clay, 10% sludge and 20% silica, and 317.3kgf/㎠ was observed when 65% clay, 15% sludge and 20% silica was added, which satisfy the brick quality standard. Absorption of the brick manufactured by the addition 20% silica of 5%, 10% 15% sludge was observed 5%, 7.65%, and 8.92% respectively, satisfying the brick quality standard of grade. Conclusively, absorption and compressive strength with the addition of proper amount of sludge which satisfies the brick quality standard was observed 10 ~ 15%.
본 연구에서는 염색혼합폐수 중의 유기물 제거를 위해 담체를 주입하여 긴 SRT 유지로 폐수 내 난분해성물질에 대한 미생물의 순응성을 증대시켜 실험을 실시하였다. 운전일수 경과에 따른 응집 후의 COD농도는 운전기간 중 평균 150mg/L로 약 50% 이상 감소한 것으로 나타났다. SS의 경우, 응집 후 SS농도는 원수에 비해 평균 64% 제거된 것으로 나타났으며 원수의 수질 변하에 따라 응집 후의 COD, SS농도 값은 원수의 농도변화와 비슷한 변화 경향을 나타내고 있는 것으로 나타났다. 색도의 경우, 응집 후 원수의 색도에 비해 약 70% 이상 감소한 것으로 나타났다. The purpose of this study is to clarify the removal efficiency of containing textile wastewater by coagulation at each test conditions. The COD concentration was reduced after coagulation compared with raw water. The average of COD concentration after coagulation was 150mg/L. And also, after coagulation, the SS concentration was reduced 64% compared with raw water. The variation of water quality after coagulation was similar to raw water.