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Optimization of the phytoremediation conditions of wastewater in post-treatment by Eichhornia crassipes and Pistia stratiotes: kinetic model for pollutants removal
Environmental Technology ( IF 2.2 ) Pub Date : 2020-12-07 , DOI: 10.1080/09593330.2020.1852445
Pierre Ntakiyiruta 1, 2 , Bi Gouessé Henri Briton 1 , Gaston Nsavyimana 2 , Kopoin Adouby 1 , David Nahimana 2 , Gaspard Ntakimazi 2 , Laurence Reinert 3
Affiliation  

ABSTRACT

This study aims at determining the optimal conditions for pollutants removal in wastewater using Eichhornia crassipes (E. crassipes) and Pistia stratiotes (P. stratiotes) as appropriate aquatic plants for a post-treatment by phytoremediation. From factors such as residence time, plant density and initial PO43− concentration, four responses, i.e. the removal efficiency of PO43−, NO3, NH4+ and the chemical oxygen demand (COD) were followed, using complete factorial design. After validation of the regression models by the statistical analyses, optimal conditions were obtained by using the global desirability function. Global desirabilities of 0.96 and 0.97 were respectively obtained for E. crassipes and P. stratiotes, for a residence time of 30 days, a plant density of 60 feet/m2 and an initial PO43− concentration of 10 mg/L. Using E. crassipes, this corresponds to the elimination of 94.2% of PO43−; 93.3% of NO3; 95.0% of NH4+ and 63.6% of COD. In the case of P. stratiotes, 93.9% of PO43−; 83.4% of NO3, 99.5% of NH4+ and 84.4% of COD were removed. Finally, under the used conditions, E. crassipes are able to better eliminate phosphorus and nitrates, while P. stratiotes are very effective in removing NH4+ and COD.



中文翻译:

凤眼莲后处理废水植物修复条件优化:污染物去除动力学模型

摘要

本研究旨在确定使用凤眼莲 (E. crassipes)Pistia stratiotes (P. stratiotes)作为合适的水生植物进行植物修复后处理的废水中污染物去除的最佳条件。从停留时间、植物密度和初始PO 4 3-浓度等因素,四个响应,即PO 4 3-、NO 3 -、NH 4 +的去除效率并采用完全析因设计跟踪化学需氧量 (COD)。通过统计分析验证回归模型后,通过使用全局意愿函数获得最佳条件。对于 30 天的停留时间、60 英尺/米2的植物密度和10 毫克/升的初始 PO 4 3-浓度,分别获得了 0.96 和 0.97 的全局期望值使用E. crassipes,这相当于消除了 94.2% 的 PO 4 3-;NO 3 - 93.3% ;95.0% 的 NH 4 +和 63.6% 的 COD。如果是P. striotes , 93.9% 的 PO 4 3− ; 去除了83.4% 的 NO 3 -、99.5% 的 NH 4 +和 84.4% 的 COD。最后,在所使用的条件下,E. crassipes能够更好地去除磷和硝酸盐,而P. stratites在去除NH 4 +和COD方面非常有效。

更新日期:2020-12-07
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