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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

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2018 Impact Factor: 3.883

Front Envir Sci Eng    2012, Vol. 6 Issue (4) : 470-476    https://doi.org/10.1007/s11783-012-0422-y
RESEARCH ARTICLE
Effects of humic acid on residual Al control in drinking water treatment plants with orthophosphate addition
Wendong WANG1(), Hua LI1, Zhenzhen DING2, Xiaochang WANG1, Rui LIU3
1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2. Xi’an Research Academy of Environmental Sciences, Xi’an 710002, China; 3. Institute of Ecology and Environment, Yangtze Delta Region Institute of Tsinghua University, Jiaxing 314050, China
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Abstract

This study aimed to investigate the effects of humic acid (HA) on residual Al control in drinking water facilities that used orthophosphate addition. The results showed that adding orthophosphate was an effective method for residual Al control for the raw water without HA. When orthophosphate was added at 1.0 min before the addition of poly aluminum chloride (PACl), the concentrations of soluble aluminum (Sol-Al) and total aluminum (Tot-Al) residue were 0.08 and 0.086 mg·L-1, respectively; both were reduced by 46% compared with the control experiment. The presence of HA would notably increase the residual Al concentration. For the raw water with 5 mg·L-1 of HA, the concentrations of Sol-Al and Tot-Al increased from 0.136 and 0.174 mg·L-1 to 0.172 and 0.272 mg·L-1, respectively. For water with a HA concentration above 5 mg·L-1, orthophosphate was ineffective in the control of residual Al, though there were still parts of orthophosphate were removed in coagulation. The amounts of Al removal were positively correlated with the solids freshly formed in coagulation. Similar to the raw water without HA, the best Al control was obtained with orthophosphate salt added at 1.0 min before PACl. HA concentrations in the raw water, solution pH, and the orthophosphate dosage suitable for residual Al control by orthophosphate precipitation were also investigated.

Keywords coagulation      drinking water      humic acid      orthophosphate      residual Al     
Corresponding Author(s): WANG Wendong,Email:wwd@xauat.edu.cn   
Issue Date: 01 August 2012
 Cite this article:   
Wendong WANG,Hua LI,Zhenzhen DING, et al. Effects of humic acid on residual Al control in drinking water treatment plants with orthophosphate addition[J]. Front Envir Sci Eng, 2012, 6(4): 470-476.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0422-y
https://academic.hep.com.cn/fese/EN/Y2012/V6/I4/470
parametersunitsdescription
water temperature°C20.0
pH-7.50
turbidityNTU0.1
alkalinity (as CaCO3)mg·L-198.7
Tot-Almg·L-10.130
Sol-Almg·L-10.111
Silicic acidmg·L-14.41
Phosphate (as PO4)mg·L-1ND
Fluoride (as F)mg·L-10.36
Calcium (as Ca)mg·L-120-25
Magnesium (as Mg)mg·L-18-12
Tab.1  Quality of the tap water used in the experiment
Fig.1  Effects of HA on residual Al concentration in the traditional drinking water treatment system
Fig.2  Effects of orthophosphate addition mode on Sol-Al (a) and Tot-Al (b) concentration in the treated water. 1#: control experiment (without orthophosphate addition); 2#: orthophosphate added at 1.0 min before PACl; 3#: orthophosphate added together with PACl; 4#: orthophosphate added at 1.0 min after PACl
Fig.3  Effects of orthophosphate dosage on Sol-Al (a) and Tot-Al (b) concentrations in the treated water. Orthophosphate was added at 1.0 min before PACl
Fig.4  Variations of Tot-Al removal (a) and orthophosphate loss (b) with orthophosphate dosage. Orthophosphate was added at 1.0 min before PACl
Fig.5  Residual Al versus solution pH treated with the raw water with different amounts of HA
Fig.6  Solubility variation of Al with pH in the AlPO and amorphous Al(OH) coexisted system
Fig.7  Relations between solids formed in coagulation (a), raw water turbidity (b) and the amount of Al loss in coagulation
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