| 吴 悦,李 强,王欣泽,孔海南,林 燕.固磷试剂强化湿地基质吸附磷的研究[J].农业环境科学学报,2014,33(4):772-776. |
| 固磷试剂强化湿地基质吸附磷的研究 |
| Enhancement of Phosphorus Adsorption on Wetland Sediments by Phosphorus-fixing Agents |
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| DOI：10.11654/jaes.2014.04.022 |
| 中文关键词: 湿地 基质 磷吸附 固磷试剂 磷平衡浓度 |
| 英文关键词: wetland sediment phosphorus adsorption phosphorus-fixing agent equilibrium phosphorus concentration（EPC0） |
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| 摘要点击次数: 1644 |
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| 中文摘要: |
| 湿地中基质的吸附与转化是磷去除的主要途径，强化湿地基质对磷的吸附能力是提高磷去除率的关键所在。研究以云南罗时江河口湿地的基质为实验对象，考察了三种固磷试剂（FeCl3、AlCl3、CaCl2）对基质磷吸附性能的强化效果。结果表明，FeCl3和AlCl3的施用比CaCl2更明显有效地增加了基质磷的吸附能、最大吸附容量、最大缓冲容量，同时更大幅度地降低了基质磷平衡浓度（EPC0），从而赋予基质更强的从水相中吸附磷的能力。在同处最低使用剂量时，投加FeCl3降低EPC0值的幅度大于AlCl3，而AlCl3对其他吸附参数的提升高于FeCl3。 |
| 英文摘要: |
| 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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