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| Adsorption of phosphorus in livestock wastewater by Hibiscus mutabilis L. and Erythrina corallodendron L. modified with La and Fe |
| Received:February 19, 2020 |
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| KeyWord:branch powders;lanthanum-modified;iron-modified;phosphorus adsorption;wastewater treatment |
| Author Name | Affiliation | E-mail | | ZENG Qin-yao | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Shi-rong | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | rsz01@163.com | | WANG Xin-yue | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | FENG Can | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | WANG Ya-ting | Chengdu Academy of Environmental Sciences, Chengdu 610072, China | |
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| Abstract: |
| 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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