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| Enhancement of Phosphorus Adsorption on Wetland Sediments by Phosphorus-fixing Agents |
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| KeyWord:wetland; sediment; phosphorus adsorption; phosphorus-fixing agent; equilibrium phosphorus concentration（EPC0） |
| Author Name | Affiliation | | WU Yue | Department of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | | LI Qiang | College of Environmental Science and Engineering, Chang′an University, Xi′an 710064, China | | WANG Xin-ze | Department of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | | KONG Hai-nan | Department of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | | LIN Yan | Department of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: |
| Enhancing phosphorus adsorption on sediments is critical for improvement of the phosphorus removal efficiency in wetland. Sediments from Luoshijiang River wetland in Yunnan Province were used to examine the effects of different phosphorus-fixing agents（FeCl3, AlCl3 and CaCl2） on improving phosphorus adsorption on the sediments. Adsorption data were fitted by Langmuir and modified Freundlich isotherms. Addition of phosphorus-fixing agents increased adsorption energy（K）, maximum adsorption capacity（Qm）, and maximum buffering capacity（MBC）, but decreased equilibrium phosphorus concentration（EPC0）. FeCl3 and AlCl3 had greater effects than CaCl2 did. When the agents were added at a rate of double P amount, EPC0 was 0.000 3 mg·L-1, 0.003 mg·L-1 and 0.049 mg·L-1 for FeCl3, AlCl3 and CaCl2 treatment, respectively, which were 99.8%, 98.2% and 66.8% reduction of the initial phosphorus concentrations. The findings indicate that applying phosphorus-fixing agents could enhance phosphorus adsorption by sediments and improve phosphorus removal from water. |
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