Multicausal analysis on water deterioration processes present in a drinking water treatment system.

Li Wang, Fang Ma, Changlong Pang, Shaik Firdoz

State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, China. wli@hit.edu.cn

Water environment research : a research publication of the Water Environment Federation 2013 Mar

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The fluctuation of water turbidity has been studied during summer in the settling tanks of a drinking water treatment plant. Results from the multiple cause-effect model indicated that five main pathways interactively influenced thequalityof tank water. During rain, turbidity levels increased mainly as a result of decreasing pH and anaerobic reactions (partial effect = 68%). Increasing water temperature combined with dissolved oxygen concentration (partial effect = 64%) was the key parameterforcontrolling decreases in water turbidity during nighttime periods after a rainy day. The dominant factor influencing increases in turbidity during sunny daytime periods was algal blooms (partial effect = 86%). However, short-circuiting waves (partial effect = 77%) was the main cause for increased nighttime water turbidity after a sunny day. The trade offbetween regulatory pathways was responsible for environmental changes, and the outcome was determined by the comparative strengths of each pathway.

Citation

Li Wang, Fang Ma, Changlong Pang, Shaik Firdoz. Multicausal analysis on water deterioration processes present in a drinking water treatment system. Water environment research : a research publication of the Water Environment Federation. 2013 Mar;85(3):232-8