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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2007, Vol. 8 Issue (9): 1475-1481    DOI: 10.1631/jzus.2007.A1475
Environmental & Energy Engineering     
Using chloramine as a coagulant aid in enhancing coagulation of Yellow River water in China
YANG Wei, CHEN Jie, LI Xing, LIANG Heng, HE Wen-jie, LI Gui-bai
Department of Environmental Engineering, Harbin University of Commerce, Harbin 150076, China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; Suzhou Litree Ultra-filtration Membrane Technology Co., Ltd., Suzhou 215152, China; College of Civil Engineering and Architecture, Beijing University of Technology, Beijing 100023, China; Tianjin Waterworks Group Company Ltd., Tianjin 300040, China
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Abstract  Considering that contaminated raw water mostly contains high Ammonia-N and a majority of water treatment plants use prechlorination process in China, efficiency of chloramines as a coagulant aid in enhancing coagulation was investigated by Jar stirring and pilot-scale tests, using Yellow River water containing high concentration of natural organic matters (NOM) and bromide in winter. The jar tests results showed that, compared with no preoxidation, preformed chloramine apparently decreased the turbidity of settled and filtered water with low dosage (2.0 mg/L), and the aid-coagulation efficiency was further enhanced with the increase of chlorine (Cl2) to Ammonia-N (N) ratio. Pilot-scale studies indicated that, in comparison to the case without preoxidation, the turbidity removal efficiency of flotation and filtration effluent water was significantly improved, the particle counts of filtered water were decreased 63.4%, the average rate of filter head loss was reduced 18.2%, and filter run time was prolonged 15.7%. Therefore, chloramine preoxidation may substantially enhance the particle separation efficiency.

Key words： Preoxidation      Chloramine      Pilot plant      Turbidity      Particle counts      Filter run time     
Received: 30 November 2006     
CLC:  TU991  
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YANG Wei
CHEN Jie
LI Xing
LIANG Heng
HE Wen-jie
LI Gui-bai
Cite this article:

YANG Wei, CHEN Jie, LI Xing, LIANG Heng, HE Wen-jie, LI Gui-bai. Using chloramine as a coagulant aid in enhancing coagulation of Yellow River water in China. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(9): 1475-1481.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2007.A1475     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2007/V8/I9/1475

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