Jinkeun Kim

Application of peak load for industrial water treatment plant design

Peak load rate(i.e., maximum daily flow/average daily flow) has not been considered for industrial water demand planning in Korea to date, while area unit method based on average daily flow has been applied to decide capacity of industrial water treatment plants(WTPs). Designers of industrial WTPs has assumed that peak load would not exist if operation rate of factories in industrial sites were close to 100%. However, peak load rates were calculated as 1.10~2.53 based on daily water flow from 2009 to 2014 for 9 industrial WTPs which have been operated more than 9 years(9-38 years). Furthermore, average operation rates of 9 industrial WTPs was less than 70% which means current area unit method has tendency to overestimate water demand. Therefore, it is not reasonable to consider peak load for the calculation of water demand under current area unit method application to prevent overestimation. However, for the precise future industrial water demand calculation more precise data gathering for average daily flow and consideration of peak load rate are recommended.

LSI characteristics based on seasonal changes at water treatment plant of Korea

AbstractCorrosion indices have a historical as well as practical relevance in assessing drinking water treatment systems. The Langelier saturation index (LSI) is commonly used as a corrosive index for drinking water. The systematic regulations including LSI as guideline for reducing corrosion have been established in Korea since 2011. However, studies in terms of seasonal changes are still required even though there are data to analyze corrosion indices. In this paper, LSI, Ryznar stability index (RSI), and aggressiveness index (AI) values of water produced by Seongnam water treatment plant (S. WTP) were analyzed and compared. RSI gives information on corrosion progress and scale in the pipe. AI is a simplified index of LSI, and both indices are based on calcium carbonate saturation. Two-stage control of the LSI value as a measure of the corrosive tendency of water is an alternative proposal. Temperature, pH, alkalinity, calcium hardness, and TDS were measured to evaluate water corrosiveness. Results for ...