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Environmental Monitoring and Assessment

, Volume 131, Issue 1–3, pp 377–386 | Cite as

Optimized Coagulation of High Alkalinity, Low Temperature and Particle Water: pH Adjustment and Polyelectrolytes as Coagulant Aids

  • Jianfeng YuEmail author
  • Dongsheng Wang
  • Mingquan Yan
  • Changqing Ye
  • Min Yang
  • Xiaopeng Ge
Article

Abstract

The Yellow River in winter as source water is characterized as high alkalinity, low temperature and low particle concentrations, which have brought many difficulties to water treatment plants. This study fully examines the optimized coagulation process of the Yellow River by conventional and pre-polymerized metal coagulants, pH adjustment and polyelectrolytes as the primary coagulants or coagulant aids. For all the metal coagulants, polyaluminum chlorides are superior to traditional metal coagulants due to their stable polymeric species and low consumption of alkalinity. The removal of natural organic matter by monomeric metal coagulants can be improved through pH adjustment, which is in accordance with the higher concentration of polymeric species formed at corresponding pH value. With the addition of polyelectrolytes as coagulant aids, the coagulation performance is significantly improved. The effective removal of dissolved organic matter is consistent with high charge density, while molecular weight is relatively important for removing particles, which is consistent with polyelectrolytes as primary coagulants. These results suggest that the coagulation mechanisms in the removal of dissolved organic matter and particles are different, which may be exploited for optimized coagulation for the typical source water in practice.

Keywords

Optimized coagulation Metal coagulants Polyelectrolytes pH adjustment 

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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Jianfeng Yu
    • 1
    Email author
  • Dongsheng Wang
    • 1
  • Mingquan Yan
    • 1
  • Changqing Ye
    • 1
  • Min Yang
    • 1
  • Xiaopeng Ge
    • 1
  1. 1.State Key Lab of Environmental Aquatic ChemistryResearch Center for Eco-Environmental Sciences, Chinese Academy of SciencesBeijingChina

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