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Enhanced coagulation for improving coagulation performance and reducing residual aluminum combining polyaluminum chloride with diatomite

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Abstract

The feasibility of using enhanced coagulation, which combined polyaluminum chloride (PAC) with diatomite for improving coagulation performance and reducing the residual aluminum (Al), was discussed. The effects of PAC and diatomite dosage on the coagulation performance and residual Al were mainly investigated. Results demonstrated that the removal efficiencies of turbidity, dissolved organic carbon (DOC), and UV254 were significantly improved by the enhanced coagulation, compared with PAC coagulation alone. Meaningfully, the five forms of residual Al (total Al (TAl), total dissolved Al (TDAl), dissolved organic Al (DOAl), dissolved monomeric Al (DMAl), and dissolved organic monomeric Al (DOMAl)) all had different degrees of reduction in the presence of diatomite and achieved the lowest concentrations (0.185, 0.06, 0.053, 0.014, and 0 mg L−1, respectively) at a PAC dose of 15 mg L−1 and diatomite dose of 40 mg L−1. In addition, when PAC was used as coagulant, the majority of residual Al existed in dissolved form (about 31.14–70.16 %), and the content of DOMAl was small in the DMAl.

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Acknowledgments

This research was financially supported by the National Nature Science Foundation of China [Nos. 51078148 and 41173103].

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Authors and Affiliations

  1. School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People’s Republic of China

    Wenchao Hu & Chunde Wu

  2. The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, People’s Republic of China

    Wenchao Hu & Chunde Wu

  3. The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou, 510006, People’s Republic of China

    Chunde Wu

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  1. Wenchao Hu
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  2. Chunde Wu
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Correspondence to Chunde Wu.

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Responsible editor: Philippe Garrigues

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Hu, W., Wu, C. Enhanced coagulation for improving coagulation performance and reducing residual aluminum combining polyaluminum chloride with diatomite. Environ Sci Pollut Res 23, 498–503 (2016). https://doi.org/10.1007/s11356-015-5282-0

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