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http://dx.doi.org/10.17663/JWR.2018.20.3.263

The investigation of adsorption properties of filter media for removal efficiency of nitrogen, phosphorus using experimental and density functional theory  

Kim, Taeyoon (Department of Civil & Environmental Engineering, Pusan National University)
Kwon, Yongju (Department of Civil & Environmental Engineering, Pusan National University)
Kang, Choonghyun (Department of Civil & Environmental Engineering, Pusan National University)
Kim, Jongyoung (Department of Civil & Environmental Engineering, Pusan National University)
Shin, Hyun Suk (Department of Civil & Environmental Engineering, Pusan National University)
Kwon, Soonchul (Department of Civil & Environmental Engineering, Pusan National University)
Cha, Sung Min (Jeollanam-do Environmental Industries Promotion Institute)
Publication Information
Journal of Wetlands Research / v.20, no.3, 2018 , pp. 263-271 More about this Journal
Abstract
In this study, we analyzed the removal efficiency of ammonia nitrogen and phosphate dependant on the column depths using various absorbents such as zeolite silica sand, and activated carbon through the column test. In addition, we analyzed electrochemical adsorption behaviors of ammonia nitrogen and phosphate through the quantum mechanical calculation based on density functional theory calculation. Experimental results represent the removal efficiency of ammonia nitrogen and phosphate are zeolite > activated carbon > silica sand, and activated carbon > zeolite > silica sand, respectively. Zeolite shows high adsorption property for ammonia nitrogen over 90%, regardless of the column depth, while activated carbon exhibits high adsorption property for both ammonia nitrogen and phosphate as the column depth for filter media increases. Theoretical findings using DFT calculation for the adsorption behaviors of adsorbents (activated carbon and silica sand) and nutrients ($PO_4{^{3-}}$, $NH_4{^{+}}$) show that activated carbon represented narrower HOMO-LUMO band gap with high adsorption energy, and even more favorable environment for electron adsorption than silica sand, which leads to the effective removal of nutrients.
Keywords
Activated carbon; Zeolite; Silica sand; Density functional theory; Binding energy;
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