공업용수 정수장 설계시 적용가능한 첨두부하에 관한 연구

Abstract

The industrial water can be defined as the water used water used for directly operating the process by boiling, cooling, raw water, product management, washing, or for the incidental precess. Needed amount of water supply of industrial water treatment plants(WTPs) can be calculated based on various conditions including the characteristics and size of companies, operating times, types of operation, characteristics of location, industrial complexes or areas. To apply the basic unit for site area which normally used for the calculation of water demand in Korea, accurate and sufficient data on previous industrial water supply should ob obtained. Otherwise, the possibility of errors is increasing from the designing phase Designers of industrial WTPs have considered only the basic unit of site area based on daily average supply unlike designers of domestic WTPs who have adopted the peak load coefficients as well as daily average supply amount. This is because designers have assumed that operation rate might reach nearly steady state and water supply pattern rarely change when the plant is operating normally, 100% of operating rate. In addition, installation of own water reservoir in the large industrial complexes was assumed to minimize the fluctuation of water supply. To date, basic unit of site area was applied for the design of the industrial WTPs without considering detailed information on industrial complexes and regional characteristics, which might lead to the excessive design of industrial WTPs. The peak load (i.e., ratio of the daily average supply and daily maximum supply) was calculated as 1.10(On-san WTPs, 2014) ~ 2.53(Chungju WTPs, 2011) based on the analysis of daily average water supply of 9 multi-regional industrial WTPs from 2009 to 2014. Operation rates of national industry complexes were expected to reach 30% in one year, 50% in 5 years and 100% of water demand in 10 years of operation at the designing phase, but 9 industrial WTPs of operation period of 9 ~ 38 years in this study showed 23.8%(Chungju WTPs) ~ 102.9%(Cheonan WTPs) of operation rate and average rate showed a somewhat insufficient level of 69.3%. Even considering the reserve capacity, the operation rate of industrial WTPs that has been operating for more than 10 years does not reach 80%, that means those WTP were somewhat excessively designed. To minimize the oversized design, designers need to consider the peak load presented in this study in addition to the basic unit of site area method. However, the results of this study do not take into account the many variables like operation patterns, weather conditions in the area or types of industries, only consider operation data of 6 years(2009 ~ 2014) daily average water supply of multi-regional water supply industrial WTPs. Therefore, further researches on consideration of location conditions are needed for planning a new construction or extension of industrial WTPs.