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김주환 ( Ju Hwan Kim ),성권식 ( Kwon Shic Sung ) 한국수처리학회 2003 한국수처리학회지 Vol.11 No.2
N/A The field investigation was performed to improve the evaluation process of pipe deterioration, which can be the criteria of replacements and rehabilitations of pipelines in water distribution system. To evaluate the deterioration degree of pipelines, accompanied by the field investigation, the data of pipe-related facilities and maintenance history, pipe material, soil types for installation and water qualities etc. are surveyed and collected from six sites of waterworks under local governments. All the variables which is used by conventional models were considered and selected to find out the determination stage of influential factors on the deterioration of water pipelines. The way to find those factors can be divided into two categories as direct and indirect method. Also, the check lists are proposed for the direct and indirect evaluation method for deteriorated pipes. Direct method for the evaluation of the deterioration degree of water pipeline requires excavation at laying sites to collect pre-determined factors. While. deterioration degree can be guessed or predicted roughly by indirect method using pipe history, soil condition data, and so on. Factors can be modified and corrected by the field practitioners or inspectors by consideing a field situation. Also, experts in the area of pipeline management works can judge the deterioration degree of pipeline on their old experiences and accumulated know-how.
수도관의 생물막 형성에 미치는 잔류염소와 파이프 재질의 영향
박세근,박재우,성권식,최성찬,김영관 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B
This laboratory study examined the impact of free chlorine residual and pipe material on the formation of biofilm in drinking water distribution pipe surfaces. Result of heterotrophic plate counts(HPC) of the biofilm in the tap water- supplied reactor averaged 2.17×105CFU/cm2 on PVC and 2.43×105CFU/cm2 on STS 316, respectively. HPCs on the surface exposed to the tap water containing 0.2mg/L of free chlorinne residual averaged 4.24×104CFU/cm2 on PVC and 6.54×104CFU/cm2 on STS 316, respectively Average of HPC/Total direct counts in the tap water-supplied reactor ranged from 1.08%(PVC) to 1.26%(STS 316) and from 0.38%(PVC) to 0.65%(STS 316) in the reactor supplemented with disinfectant, resfectively. No correlation was observed between disinfectant addition and biofilm density. With regard to the biofilm formation, little difference existed between PVC and STS 316. Yellow and red pigmented bacteria were the dominant expressions in bulk fluid, whereas non-pigmented bacteria were found dominant in the biofilm. Pink/red pigmented bacteria were found to be facultative anaerobic, while yellow pigmented bacteria and non-pigmented bacteria were found to be obligate aerobic.