Effects of Varying Particle Sizes and Different Types of LDH-Modified Anthracite in Simulated Test Columns for Phosphorous Removal

Xiangling Zhang, Qiaozhen Chen, Lu Guo, Hualing Huang and Chongying Ruan
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Xiangling Zhang: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
Qiaozhen Chen: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
Lu Guo: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
Hualing Huang: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
Chongying Ruan: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China

IJERPH, 2015, vol. 12, issue 6, 1-13

Abstract: A comparative study was carried out for the removal of phosphorus in simulated unplanted vertical-flow constructed wetlands with different layered double hydroxide (LDHs) coated anthracite substrates. Three particle sizes of anthracites were selected and modified separately with nine kinds of LDH coating. The simulated substrates test columns loaded with the original and modified anthracites were constructed to treat the contaminated water. For the medium and large particle size modified anthracite substrates, the purification effects of total phosphorus, total dissolved phosphorus and phosphate were improved by various degrees, and the purification effect of the medium particle size anthracite is better than that of the large size one. The medium size anthracite modified by ZnCo-LDHs had optimal performance with average removal efficiencies of total phosphorus, total dissolved phosphorus and phosphate reaching 95%, 95% and 98%, respectively. The maximum adsorption capacity on ZnCo-LDHs and ZnAl-LDHs modified medium sizes anthracites were 65.79 (mg/kg) and 48.78 (mg/kg), respectively. In comparison, the small size anthracite is not suitable for LDHs modification.

Keywords: LDHs; coating modification; anthracite substrate; phosphorous removal; sewage treatment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
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