| 曾溱瑶,张世熔,王新月,冯灿,王亚婷.La和Fe改性木芙蓉和龙牙花树枝粉对畜禽废水中磷的吸附[J].农业环境科学学报,2020,39(8):1828-1836. |
| La和Fe改性木芙蓉和龙牙花树枝粉对畜禽废水中磷的吸附 |
| Adsorption of phosphorus in livestock wastewater by Hibiscus mutabilis L. and Erythrina corallodendron L. modified with La and Fe |
| 投稿时间：2020-02-19 |
| DOI：10.11654/jaes.2020-0167 |
| 中文关键词: 树枝 镧改性 铁改性 磷吸附 废水处理 |
| 英文关键词: branch powders lanthanum-modified iron-modified phosphorus adsorption wastewater treatment |
| 基金项目:四川省重点研发项目（2019YFN0020） |
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| 中文摘要: |
| 畜禽养殖废水中过量的磷排放易导致水体富营养化。为有效去除畜禽废水中的磷和对园林废弃物进行资源化利用，本研究探讨La和Fe分别改性木芙蓉树枝粉（HM）和龙牙花树枝粉（EC）得到的4种材料（La-HM、La-EC、Fe-HM和Fe-EC）在不同投加量、溶液pH、吸附时间和初始磷浓度等条件下对模拟废水中磷吸附的影响。结果表明，4种改性材料对模拟废水中磷的单位吸附量随投加量的增加呈指数或幂函数下降（P<0.05）；随溶液pH的升高，La改性的两种材料对磷的吸附量呈先上升后下降趋势，Fe改性的两种材料则相应呈幂函数下降（P<0.05）。它们的吸附动力学过程符合准二级动力学模型，吸附等温线更适合用Freundlich模型拟合。4种改性材料对模拟废水中磷的理论最大吸附量分别为15.00、12.02、7.18 mg·g-1和8.43 mg·g-1，对实际养猪废水中磷的吸附量为11.63~21.71 mg·g-1，是未改性前的1.58~3.23倍。因此，La和Fe改性木芙蓉和龙牙花树枝粉是吸附畜禽废水中磷的潜在材料。 |
| 英文摘要: |
| Excessive phosphorus discharge from livestock wastewater can easily lead to the eutrophication of waterbodies. In order to effectively remove phosphorus from livestock wastewater and recycle landscaping waste, powders of Hibiscus mutabilis L. and Erythrina corallodendron L. modified by lanthanum(La)and iron(Fe) (La-HM, La-EC, Fe-HM, and Fe-EC)were used to absorb phosphorus in a simulated wastewater under different dosages, solution pH, adsorption times, and initial phosphorus concentrations. The phosphorus adsorption capacities of the four modified materials in simulated wastewater decreased either in an exponential or power function with increasing dosages(P<0.05). The phosphorus adsorption capacities first increased and then decreased for the La-HM and La-EC materials, whereas they decreased in a power function for the Fe-HM and Fe-EC materials with increasing solution pH(P<0.05). The corresponding adsorption kinetic processes were in accordance with the pseudo-second-order kinetic model, and the adsorption isotherms were more suited to the Freundlich model. The phosphorus theoretical maximum adsorption capacities of the La-HM, La-EC, Fe-HM, and Fe-EC in the simulated wastewater were 15.00, 12.02, 7.18 mg·g-1, and 8.43 mg·g-1, respectively. The phosphorus adsorption capacities of lanthanum and iron modified materials in swine wastewater ranged from 11.63 mg·g-1 to 21.71 mg·g-1(i.e., 1.58~3.23 times those of the unmodified materials). |
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