Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 88, Issue -, Pages 1-11Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2019.08.007
Keywords
Al species; Enteromorpha polysaccharides; Polyaluminum chloride; Al-27 nuclear magnetic resonance; Simultaneous removal
Categories
Funding
- Taishan Scholar Program [ts 201511003]
- National Natural Science Foundation of China [51478250]
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Copper oxide nanomaterials have been extensively applied and can have serious impacts when discharged into the aquatic environment, especially when complexed with humic acid (HA) to form composite contaminants. As an innovative recycled coagulant aid, Enteromorpha polysaccharides (Ep) were associated with polyaluminum chloride (PACl) (denoted as PACl-Ep) to simultaneously remove CuO nanoparticles, Cu2+ and HA in this study. The influence of different Al species coagulants (AlCl3, PACl(b) and PACl(c)) and water pH on coagulation performance, floc properties and reaction mechanisms was investigated in detail. Results showed that in the three PACl-Ep systems, PACl(b)-Ep gave the highest removal efficiencies for turbidity and Cu2+, and the best UV254 removal effect was reached by using PACl(c)-Ep. Higher contents of Al-b and Al-c contributed to great coagulation performance because of their stronger bridging and sweeping effects. For all the Al species coagulants, alkalescent conditions were more conducive to removing Cu and HA compared to acidic conditions. Additionally, smaller and more agminated flocs with great recovery ability were formed by PACl(b)-Ep and PACl(c)-Ep systems (bridging and enmeshment effects cooperated with the chelated reticular structure formed by the Ep and Al species). Similarly, due to the increased hydrolysis and hydroxide precipitates, flocs formed under the condition of alkalescence were smaller, denser and stronger compared with weakly acidic conditions. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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