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Effects of humic acid on residual Al control in drinking water treatment plants with orthophosphate addition

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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.

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Authors and Affiliations

  1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Wendong Wang, Hua Li & Xiaochang Wang

  2. Xi’an Research Academy of Environmental Sciences, Xi’an, 710002, China

    Zhenzhen Ding

  3. Institute of Ecology and Environment, Yangtze Delta Region Institute of Tsinghua University, Jiaxing, 314050, China

    Rui Liu

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  1. Wendong Wang
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  2. Hua Li
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  3. Zhenzhen Ding
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  4. Xiaochang Wang
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  5. Rui Liu
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Correspondence to Wendong Wang.

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Wang, W., Li, H., Ding, Z. et al. Effects of humic acid on residual Al control in drinking water treatment plants with orthophosphate addition. Front. Environ. Sci. Eng. 6, 470–476 (2012). https://doi.org/10.1007/s11783-012-0422-y

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  • DOI: https://doi.org/10.1007/s11783-012-0422-y

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