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KMID : 0382420010270010027
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Korean Journal of Environmental Health Society
2001 Volume.27 No. 1 p.27 ~ p.35
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Evaluation of Chlorine Demand and Chlorine Decay Kinetics for Drinking Water
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Lee Yoon-Jin
Jo Kwan-Hyung
Nam Sang-Ho
Choi Jong-Heon
Myung Bok-Tae
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Abstract
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This aim of the work presented in this paper is to investigate the factors that affect chlorine decay and to develop functional relationships that can be used to enhance the durability of network models. Predictive relationships were established that correlated the rate of chlorine decay to the various water conditions such as DOC, NH₃-N, initial chlorine, contact time, temperature and pH values. Free chlorine residual decreased with increasing temperature, DOC, NH₃-N, reaction time and chlorine dose. At 20℃, pH 7, the initial chlorine demand per mg as DOC/L and mg as NH₃-N/L was about 0.43, 2.69 mg/l respectively at 5 minutes contact time and the consumed chlorine per mg as DOC/L and mg as NH₃-N/L was about 0.47, 3.40 mg/l respectively at 180 minutes contact time. The reaction between chlorine and humic acids was lasted until 48 hr, but the reaction between chlorine and NH₃-N was almost completed in 180 min. When the temperature is raised by 10℃, chlorine is more consumed about 0.25 mg/l in the absence of organic substances and it is more consumed about 3.4 mg/l in the presence of humic acid (5 mg/l) in water at pH 7 for 180 min. Regression analysis created the resulting prediction equation for the chlorine decay in a SPSS package of the computer system. The model is as follows; C_t=1.239+0.707(Co)-0.000529(Time)-0.0112(Temp)+0.02227(pH)-0.421(DOC)-2.132(NH₃-N).
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KEYWORD
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