Enhanced coagulation for high alkalinity and micro-polluted water: the third way through coagulant optimization

Water Research
Mingquan YanChristopher W K Chow

Abstract

Conventional coagulation is not an effective treatment option to remove natural organic matter (NOM) in water with high alkalinity/pH. For this type of water, enhanced coagulation is currently proposed as one of the available treatment options and is implemented by acidifying the raw water and applying increased doses of hydrolyzing coagulants. Both of these methods have some disadvantages such as increasing the corrosive tendency of water and increasing cost of treatment. In this paper, an improved version of enhanced coagulation through coagulant optimization to treat this kind of water is demonstrated. A novel coagulant, a composite polyaluminum chloride (HPAC), was developed with both the advantages of polyaluminum chloride (PACl) and the additive coagulant aids: PACl contains significant amounts of highly charged and stable polynuclear aluminum hydrolysis products, which is less affected by the pH of the raw water than traditional coagulants (alum and ferric salts); the additives can enhance both the charge neutralization and bridging abilities of PACl. HPAC exhibited 30% more efficiency than alum and ferric salts in dissolved organic carbon (DOC) removal and was very effective in turbidity removal. This result was confirm...Continue Reading

References

Aug 15, 2006·Water Research·Mingquan YanHongxiao Tang
Oct 9, 2007·Journal of Environmental Sciences (China)·Ming-Quan YanHong-Xiao Tang
Sep 13, 2011·Water Research·James K Edzwald, Johannes Haarhoff

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Citations

Apr 15, 2010·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Aleksandra TubićMilena Dalmacija
May 1, 2012·Environmental Science and Pollution Research International·Davor DolarDragana Mutavdžić Pavlović
May 13, 2011·Journal of Hazardous Materials·Eran TzfatiAmos Bick
Jul 22, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Mingquan YanJixia Cheng

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