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Bacteriological Quality of a Forage Grass (<i>Pennisetum purpureum Schumach</i>) Used in Constructed Wetland Removing Domestic Wastewater Pathogenic Microorganism

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Journal of Environmental Protection 2021年第5期12卷 311-327页

作者： Franck Michaël Zahui Élisée Napari Yeo Jean-Marie Pétémanagnan Ouattara Lacina Coulibaly Laboratory of Environment and Aquatic Biology Department of Sciences and Environment Management Nangui Abrogoua University Abidjan C&ocirc te d’Ivoire University of Man Man C&ocirc te d’Ivoire Ecology Research Center Nangui Abrogoua University Abidjan C&ocirc te d’Ivoire

Constructed Wetlands (CWs) are an adequate wastewater treatment system with possibility to generate income, in particular by the use of plants of economic interest. However, very few studies deal with the bacteriological quality of plants after wastewater treatment. Thermotolerant coliforms and Sulfite-reducing bacteria were investigated on the above-ground biomass of a species of forage plant (Pennisetum purpureum) as well as their removal in an experimental pilot consisting of four beds, for three months. Two beds were planted and two unplanted beds were used as control. Germs in the wastewater were significantly reduced in both filtrates, with higher removal efficiency of 97.4% for Thermotolerant coliforms and 87.5% for Sulfite-reducing bacteria, in the planted bed. Wastewater treatment resulted in bacteriological contamination of the above-ground plant biomass with a significant decreases in number of germs from 660 to 28 CFU/g (Thermotolerant coliforms) and from 15 to 0 CFU/g (Sulfite-reducing bacteria), when the harvest height increased from the base to the upper end of the plants. However, averages of 305 CFU/g of Thermotolerant coliforms and 5 CFU/g of Sulfite-reducing bacteria were obtained in the above-ground plant biomass which would not present any potential risks for a possible use of the plant biomass as fodder. Thus, the use of forage plant suggests good prospects for upgrading said plants for animal feed.

关键词： Constructed Wetlands pathogens microorganisms Forage Plant Above-Ground Plant Biomass Quality

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