http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
대전지역 공동주택의 급수설비 현황과 개선방안에 대한 조사연구 : 수질분야를 중심으로 focused on Water Quality
어성욱,박승익,박상진 우송대학교 1998 우송대학교 논문집 Vol.3 No.-
The requirements of this safe drinking water impose an additional burden on the water treatment works in that it requires that the quality regulations be met at the consumer's tap-not at the treatment plant. This means that it is essential that the water reach the consumer with the same quality it had at the point of entry to the distribution system. This study was conducted to survey the adaptability that the effluent water qualities from distribution system, especially, in the extra city water facilities of the apartment complex met the regulation of drinking water qualities. The sampling points of water quality analysis were basement storage tank, high tank and tap. 46 apartment complexes (those were constructed before 1990 in Taejoeon) were surveyed and the survey results as follows: 1) The water quality of the influent to extra city water facilities met the regulations of drinking water quality. 2) Ferric ion and residual chloride concentration were the major factor that effected the water quality of tap water. Increased ferric ion concentration due to pipe corrosion and decreased residual chloride concentration due to oxidation of organics deteriorate the water quality of drinking water. 3) The longer the pipe length of extra city water facilities, the higher the ferric ion concentrations of tap water. The relationship between pipe length and ferric ion concentration was revealed as following formular. y = 0.0007X - 0.0056. (r² = 0.5744) 4) The average water qualities of tap water in this survey were 7.07 pH, 50.5 mg/L hardness, 0.178 NTU turbidity, 1.38 mg/L KMnO4 consumption rate, 0.043 mg/L ferric oin, 0.11 mg/L residual chloride and non detectable E. coli concentration. 5) The water quality of tap in this study were satisfied the regulation of drinking water quality in all its aspects. But, it needs to be concerned about that the variations of ferric ion and residual chloride concentration.
통계적 수명곡선함수에 의한 상수관로의 노후상태 평가모델
김주환 ( Ju Hwan Kim ),배철호 ( Cheol Ho Bae ),이두진 ( Doo Jin Lee ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.5
Proper and timely maintenance of water pipes is inevitable to reduce leakage and breakage, to prevent water quality deterioration, to increase hydraulic capacity and so on. Rehabilitation of water pipes is applied to solve these problems and prolong the useful life since water pipes are most expensive part of a water supply system. Residual life of water pipes should be estimated by a current condition for the short and long-term rehabilitation planning. The remaining life of a water pipe buried underground is considerably affected from various factors such as environmental characteristics, pipe characteristics, operation and maintenance, etc. Therefore, it is difficult to determine their service life as uniformly the same value assigned by related laws and ordinances. As a result, the service life should be determined by the technical judgement based on the assessment for the condition of water pipes. In this study, the methodology is proposed to predict a residual life and plan short and long-term strategies for replacement/rehabilitation by introducing statistical life function through the current condition assessment. The methodology was applied for the verification and reliability to several sites selected in multi-regional transmission pipelines. The proposed method could helps to support reasonable and economical decision of rehabilitation/replacement in the present and future. To improve conventional assessment method of aged water pipes, affecting factors are simplified based on the statistical analysis results from the measured data in the field and the physical deterioration mechanism for better reliability.
유도근,이승엽,이호민,전환돈,김중훈 한국방재학회 2015 한국방재학회논문집 Vol.15 No.6
The life cycle energy analysis of social infrastructures including water pipeline system considering installation, maintenance control, operation, and dismantling is essential component. In this study, life cycle energy analysis was applied to establishment of pipe rehabilitation/ replacement strategies and energy consumption and hydraulic factors (nodal pressure) were used for result comparisons. The life cycle of water pipeline system was classified into three steps; 1) manufacturing and installation, 2) rehabilitation, maintenance, replacement and energy recovery form replacement, and 3) disposal. The energy consumption of water pipeline system was calculated at each step. In case of rehabilitation/replacement strategies two criterions were applied; 1) the time after the pipe was laid and 2) variance of pipe roughness coefficient. The developed method in this study was applied to a real water pipeline system of K-block in J-city, Korea and the results were analyzed. The developed method in this study can be applied to suggestion of basic method for specialization of water pipeline system maintenance technique considering energy consumption. 상수관망과 같은 대규모 사회기반시설의 경우 초기 설치부터 유지관리, 운영, 그리고 해체에 이르는 전 과정에서 나타나는 에너지 수지분석이 반드시 필요하다. 본 연구에서는 상수관로의 개량/교체 전략에 따른 생애주기 에너지 분석을 수행하고, 그 결과로 나타나는 에너지 소비량과 수리학적 인자 (수압)의 검토를 통해 개량/교체 전략별 장단점을 파악하고자 하였다. 이를 위하여, 상수관망의 생애주기를 1) 상수관로 제조 및 설치, 2) 상수관로 개량, 보수, 교체, 교체에 따른 에너지 회복, 그리고 3) 관로 교체에 따른 폐기 단계로 구분하여 각각의 단계별 에너지 소비량을 결정한다. 그리고 개량/교체 전략의 경우 1) 매설 후 경과년수 기준의 개량/교체, 그리고 2) 관로 마찰계수 변화에 따른 개량/교체의 두 가지를 적용하였다. 해당 방법론을 국내 실제 대블록 상수관망인 J시 K블록에 적용하여 결과를 분석하여 제시하였다. 제안된 방법론은 향후 에너지 소비를 고려한 상수관망 유지관리 기법 상세화를 위한 기초방법론으로 사용이 가능할 것으로 판단된다.
자동화 장비를 이용한 대형 상수관로 갱생을 위한 코팅재료 선정 및 방법에 관한 연구
김진원,김동현,이영건,이세완,김두일 대한상하수도학회 2016 상하수도학회지 Vol.30 No.6
There is a growing concern on the improvement of water distribution pipeline for multi-regional water supply system in Korea along with its aging infrastructure. Rehabilitation of large diameter pipeline is more efficient in cost and time compared to replacement with trenching. The procedure for rehabilitation are diagnosis, cleaning, spraying coating material, and final inspection. The internal state of pipeline was carefully diagnosed and got C grade, which required rehabilitation. We found that 17,274,787,000 Korean won could be saved after pipe surface coating because of increased C coefficient of Hazen-Williams equation. Optimal coating material was D polyurea. We also found optimal distance between spraying nozzle and pipe wall to be 70 - 80 cm, which were critical factors for coating quality. This study also illustrated the time for spray drying to be more than 30 min. These results could be used in the quality control process during rehabilitation of aged pipelines.