Publications Scientifiques

[ Article ] Study of the Purification Efficiencies of three Floating Macrophytes in Wastewater Treatment

Date de soumission: 27-02-2018
Année de Publication: 2012
Entité/Laboratoire Laboratoire d'Ecologie Appliquée (LEA)
Document type : Article
Discipline(s) :
Titre Study of the Purification Efficiencies of three Floating Macrophytes in Wastewater Treatment
Journal: International Research Journal of Environment Sciences
Catégorie Journal: Internationale
Impact factor: 0
Volume Journal: 1
Resume In Benin, wastewater treatment remains a recurrent problem. While new technologies are in use around the world, sewage treatment process, adapted to the contexts of developing countries is almost inexistent. To overcome these deficiencies and provide practical experience for domestic wastewater treatment, phyto-purification tests on domestic wastewater has been conducted on the Campus of the University of Abomey-Calavi (CUAC). The work focused on three floating species which are Eichhornia crassipes Mart. Solms-Laub. (Water hyacinth), Pistia stratiotes L. (Water lettuce) and Lemna minor L. (Duckweed). A mini system was installed and consisted of an anaerobic lagoon and three different floating macrophyte ponds. The parallel position of the floating macrophyte ponds allowed, during the first phase, to assess the wastewater purification efficiency of individual floating macrophytes.; this was achieved by monitoring the pollution level of the wastewater in terms of its : SS, COD, BOD5, TKN, N-NO3- ,P – PO43-, fecal coliforms and fecal streptococci and monitoring operational parameters such as T, pH, EH , turbidity, electrical conductivity. The results of the first phase showed that water hyacinth has been effective in the removal of carbon and nitrogen for COD 70%, 52.8% BOD5, TKN 78.3% while water lettuce achieved nitrogen (N-NO3-) and P –PO43-, forms abatement at 20.0%, and 92.6% respectively. Duckweed was successful in reducing 35.6% of TKN, and 100% of coliform and fecal streptococci. The complementary effect of the potential of the studied species in a mixed system of floating lagoon gives even better returns, provide that the limit of the salinity content to 1.126 µS / cm in wastewater tolerable by the macrophytes is observed.
Mots clés Domestic sewage, treatment, floating macrophytes, purification efficiency
Pages 37 - 43

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