Probing Coagulation Behavior of Individual Aluminum Species for Removing Corresponding Disinfection Byproduct Precursors: The Role of Specific Ultraviolet Absorbance

PloS One
He ZhaoJiuhui Qu

Abstract

Coagulation behavior of aluminum chloride and polyaluminum chloride (PACl) for removing corresponding disinfection byproduct (DBP) precursors was discussed in this paper. CHCl3, bromine trihalomethanes (THM-Br), dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA) formation potential yields were correlated with specific ultraviolet absorbance (SUVA) values in different molecular weight (MW) fractions of humic substances (HS), respectively. Correlation analyses and principal component analysis were performed to examine the relationships between SUVA and different DBP precursors. To acquire more structural characters of DBP precursors and aluminum speciation, freeze-dried precipitates were analyzed by fourier transform infrared (FTIR) and C 1s, Al 2p X-ray photoelectron spectroscopy (XPS). The results indicated that TCAA precursors (no MW limits), DCAA and CHCl3 precursors in low MW fractions (MW<30 kDa) had a relatively good relations with SUVA values. These DBP precursors were coagulated more easily by in situ Al13 of AlCl3 at pH 5.0. Due to relatively low aromatic content and more aliphatic structures, THM-Br precursors (no MW limits) and CHCl3 precursors in high MW fractions (MW>30 kDa) were preferentially removed by PA...Continue Reading

References

Jan 25, 2003·Environmental Science & Technology·Jerry A Leenheer, Jean-Philippe Croué
May 6, 2005·Environmental Science & Technology·Bradley P AllpikeGary Amy
Jan 26, 2006·Environmental Science & Technology·Chengzhi HuJia Rut
Jun 2, 2007·Environmental Science & Technology·Guanghui Hua, David A Reckhow
Aug 22, 2008·Water Research·Jr-Lin LinDongsheng Wang
Sep 20, 2008·Environmental Science & Technology·Christopher W K ChowMary Drikast
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Jan 1, 2012·Journal of Environmental Sciences (China)·Linan XingDongsheng Wang

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Methods Mentioned

BETA
X-ray
PCA

Software Mentioned

TCAAFP
SUVA

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