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Removal rates of phosphorus by modified anthracite substrates coated with different layered double hydroxides reacted by different metal compounds in vertical-flow constructed wetlands |
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Abstract Nine different kinds of layered double hydroxides (LDHs) were co-precipitated synthesized under alkaline conditions using MgCl2, ZnCl2, CaCl2, CoCl3, FeCl3, and AlCl3. The simulated test columns were constructed using the modified anthracite substrates in-situ coated with the different synthesized LDHs to treat the urban sewage, and the control treatment (using anthracite as the substrates) was set up at the same time. Compared with control, the removal rates of total phosphorus, total dissolved phosphorus, particulate phosphorus and phosphate in the effluent were improved at different degrees after treating with the nine modified anthracite substrates: The modified anthracite substrates with Zn2+ showed good removal efficiency to total phosphorus, total dissolved phosphorus, particulate phosphorus and phosphate. In particular, the modified anthracite substrates coated with ZnCo-LDHs and ZnAl-LDHs showed average removal rates of 95% to total phosphorus and total dissolved phosphorus, and 98% to phosphate.
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Received: 01 January 2014
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