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Optimization process of organic matter removal from wastewater by using Eichhornia crassipes.

Mahunon, Sènandémi Edwige Reine; Aina, Martin Pépin; Akowanou, Akuemaho Virgile Onésime; Kouassi, Edmond Konan; Yao, Benjamin Kouassi; Adouby, Kopoin; Drogui, Patrick (2018). Optimization process of organic matter removal from wastewater by using Eichhornia crassipes. Environmental Science and Pollution Research , vol. 25 , nº 29. p. 29219-29226. DOI: 10.1007/s11356-018-2771-y.

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Résumé

La transcription des symboles et des caractères spéciaux utilisés dans la version originale de ce résumé n’a pas été possible en raison de limitations techniques. La version correcte de ce résumé peut être lue dans le document original.

This study aimed to determine the optimal conditions for organic matter removal from wastewater by Eichhornia crassipes (E.C). As a matter of fact, a complete factorial design was used to determine the effect of residence time (X1), plant density (X2) and initial chemical oxygen demand (COD) concentration (X3) on the phytoremediation process. The process’s performance was measured on COD (Y1), NH4+ (Y2) and PO43− (Y3), with the results indicating a reduction of 8.59–81.71% of COD (Y1); 22.53–95.81% of NH4+ (Y2) and 0.54–99.35% of PO43− (Y3). Then, the first-order models obtained for COD, NH4+ and PO43− removal were validated using different statistical approaches such as statistical and experimental validation. Moreover, multi-response optimization was carried out through different scenarios. On the whole, the results obtained indicated that two serial ponds are required for an optimum organic matter removal by Eichhornia crassipes. Indeed, for the first pond, a residence time of 15 days is needed with a plant density of 60 ft/m2 and an initial concentration of about 944 mg/L. The second was the same residence time as the first with similar plant density of 60 ft/m2 and an initial load 192 mg/L (> 200 mg/L). Optimal organic matter removal from wastewater using Eichhornia crassipes requires two ponds arranged in chain.

Type de document: Article
Mots-clés libres: Eichhornia crassipes; multi-response optimization; phytoremediation
Centre: Centre Eau Terre Environnement
Date de dépôt: 28 nov. 2018 16:12
Dernière modification: 28 nov. 2018 16:12
URI: http://espace.inrs.ca/id/eprint/7736

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