Etat d’eutrophisation de la lagune continentale Ono (Bonoua sud-est de la Côte d’Ivoire) dans un environnement agro-industriel durant la crue du fleuve Comoé

Gboko, Affoua Jeanne; Akobe, Apie Colette; Aka, Ané Maurice; Aka, Charles Albéric; Adou, K.; Yapo, Ossey Bernard; Monde, Sylvain; Kouamé, Aka

doi:10.4314/ijbcs.v13i6.40

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…However, the weak correlation between nitrites and nitrates ions (r = 0.51), shows that the nitrite contents in the water column are linked to the nitrification activity of bacteria. This result is in the same vein as the conclusions of Gboko et al 2019 [37] *Significant correlation (P < 0.05) T: temperature, EC: electrical conductivity, TDS: total dissolved solids, TP: total phosphorus, IP: inorganic phosphorus, OP: organic phosphorus, NO3 -: nitrate ions, NO2 -: nitrite ions, NH4 + : ammonium ions, Chl a: chlorophyll a, Fe-P: iron-bound P, Ca-P: calcium-bound P, TP (S): total phosphorus in sediments, Org-P (S): organic phosphorus in sediments and IP (S): inorganic phosphorus in sediments 1994 [38] is greater than 7 in all stations (Fig. 7).…”

Section: Spatial Distribution Of Nutrients In the Water Columnsupporting

confidence: 90%

Eutrophication of a River Impacted by Agricultural Activities (N’zi River, Côte D’ivoire)

Soro¹,

Ouattara²,

N’Goran³

et al. 2021

IRJPAC

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Water eutrophication is a global environmental problem. In Côte d'Ivoire, no data is available to predict this phenomenon in rivers. The purpose of this study is to evaluate the impact of agricultural activities on the eutrophication phenomenon of the N'zi River in Côte d'Ivoire. The approach used focused on two points. The first one was to determine the different dissolved forms of phosphorus and nitrogen in the water of the N'zi River using AFNOR methods. The second focused on the mobility of phosphorus in sediments using the sequential extraction procedure of Williams. Results show that the inorganic phosphorus concentrations (IP) in sediments decrease in favor of contents in the water. Moreover, nitrate ions (NO3-) quantitatively dominates the nitrogenous forms in water. These results are attributable to the intensive use of fertilizers in agriculture, the leaching of cropland and/or contamination by human or animal waste. The phosphorus sequential extraction shows that 29 to 72% of the iron-bound bioavailable P (Fe-P) in sediments is likely to be mobilized into the water column and contributes to the N'zi River eutrophication. Therefore, an awareness and monitoring program must be put in place to reduce the nutrients inputs in the N'zi River upstream.

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Section: Spatial Distribution Of Nutrients In the Water Columnsupporting

confidence: 90%

Eutrophication of a River Impacted by Agricultural Activities (N’zi River, Côte D’ivoire)

Soro¹,

Ouattara²,

N’Goran³

et al. 2021

IRJPAC

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“…Cette augmentation de la chlorophylle B serait due à la diminution de la chlorophylle A, principal pigment photosynthétique, entraînant ainsi l'inhibition de la photosynthèse consommatrice de la teneur de ce pigment. En effet, la chlorophylle B est le pigment accessoire qui collecte l'énergie et la transmet à la chlorophylle Ace qui signifie qu'en absence de la chlorophylle A, la chlorophylle B n'est pas utilisé par les macrophytes (Féret, 2009). Enfin, l'élimination de la pollution organique évaluée par la DCO et la DBO (Tableau 2) vient confirmer l'efficacité de ce dispositif expérimental à la dépollution des eaux usées domestiques.…”

Section: Discussionunclassified

“…Au nombredes procédés de traitement, le lagunage naturel constitue une technologie efficace à moindre coût et le mieux adapté pour les pays en développement à climat tropical (Kone, 2002). Toutefois, un des défis à relever pour ce système de traitement est l'élimination des nutriments qui causent toujours un véritable problème compte tenu des rejets qui ne respectent pas des normes (Mama et al, 2012;Wang and Sample, 2014;Gboko et al, 2019).…”

Section: Introductionunclassified

Actions combinées de Eichhornia crassipes et Pistia stratiotes pour traitement tertiaire de l’effluent des bassins facultatifs de la station d’épuration de Buterere, Burundi

Ntakiyiruta¹,

Nsavyimana²,

Briton³

et al. 2020

Int. J. Bio. Chem. Sci

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Le lac Tanganyika, exutoire des eaux de rejet de la station d’épuration de Buterere, est menacé par l’eutrophisation à cause de l’enrichissement en nutriments. Conséquence de la pression démographique, un redimensionnement en vue d’accroître la performance épuratrice de ladite station nécessiterait d’importants investissements. Fort de cela, l’action combinée de Pistia stratiotes et Eichhornia crassipes en traitement tertiaire a été envisagée. A cet effet, six tanks disposés deux à deux en série ont constitué des bassins de phytoremediation contre deux témoins. Ces tanks étaient alimentés en continu par l’effluent prélevé à la sortie des bassins facultatifs de la station. Les Pistia stratiotes et Eichhornia crassipes étaient respectivement cultivées dans ces tanks placés en amont et aval du pilote expérimental avec une densité initiale de 60 pieds/m2. Ces essais ont été suivis tous les deux jours à la sortie de chaque tank en évaluant les concentrations des paramètres jusqu’à atteindre une efficacité de 86,08%; 57,37%, 46,21%; 57,41%, 74,36%; 99,37%; 93,77% et 100% respectivement pour NH4+, NO3-, PO43- , DCO, DBO, Chlorophylle A, Chlorophylle B et Chlorophylle C. Au vue de ces résultats, cette action combinée est une alternative pour renforcer la capacité épuratrice de la station de Buterere.Mots clés : Eaux usées, nutriments, phytoremédiation, lagunage, tank, mode continu. English Title: Combined actions of Eichhornia crassipes and Pistia stratiotes for tertiary treatment of the effluent from the facultative basins of the Buterere treatment plant, BurundiLake Tanganyika, the outlet for the Buterere sewage treatment plant, is threatened by eutrophication due to nutrient enrichment. As a consequence of population pressure, a resizing to increase the treatment performance of the plant would require significant investments. With this in mind, the combined action of Pistia stratiotes and Eichhornia crassipes in tertiary treatment was considered. For this purpose, six tanks arranged two by two in series constituted phytoremediation basins against two controls. These tanks were continuously fed by the effluent taken at the exit of the optional basins of the station. Pistia stratiotes and Eichhornia crassipes were respectively cultivated in these tanks placed upstream and downstream of the experimental pilot with an initial density of 60 feet/m2. These tests were followed every two days at the exit of each tank by evaluating the concentrations of the parameters until an efficiency of 86.08%; 57.37%, 46.21%; 57.41%, 74.36%; 99.37%; 93.77% and 100% respectively for NH4+, NO3-, PO43-, COD, BOD, Chlorophyll A, Chlorophyll B and Chlorophyll C was reached. In view of these results, this combined action is an alternative to strengthen the scrubbing capacity of the Buterere plant.Keywords: Wastewater, nutrients, phytoremediation, lagooning, tank, continuous mode.

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“…Macrophytic lagoon systems have been recognised as one of the most efective ecotechnologies in eliminating pathogens associated with the long retention time of wastewater in these systems [22,23]. However, a major challenge for this treatment system is the elimination of nitrates and phosphates, which still causes a real problem given that the treated waters do not meet WHO standards for wastewater release into the environment [24,25]. In the tropical and subtropical regions, free-foating macrophytes are dominant in wetlands.…”

Section: Introductionmentioning

confidence: 99%

Eichhornia crassipes Efficacy in Secondary Wastewater Treatment in the Western Highlands of Cameroon

Manekeu Tanetsa,

Lekeufack,

Edzigui Tsimi

et al. 2023

The Scientific World Journal

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Wastewater treatment using lagoons technology is recognised to have potential to protect the environment and preserve water resources. The implementation requires mastery of ecological conditions of operation and management of the plants used. We aimed to contribute to the implementation of macrophyte-based lagoons for wastewater treatment in the Western Highlands of Cameroon. We used two sets of four lagoons in series; one was vegetated with E. crassipes, while the other served as the control. Each set constituted an anaerobic, two facultative, and maturation lagoons. Each lagoon system was supplied with primary-treated domestic wastewater from the wastewater treatment plant of the University of Dschang, Cameroon, at a hydraulic loading rate of 1.13 m3/day. Monthly wastewater samples were collected from the inflow and outflow of each lagoon for physicochemical and bacteriological analyses, and plant growth was assessed biweekly for six months spanning the dry and rainy seasons. Macrophyte lagoons showed positive plant growth during both seasons. The highest plant height (10.67 and 25.21 cm), longer roots (11.3 and 37.41 cm), and the highest number of new buds (14 and 20 buds) were obtained during the dry and rainy seasons, respectively. Plants were significantly ( P < 0.0001) taller in facultative lagoons in the rainy season than in the dry season. Vegetated lagoons significantly ( P < 0.05) contributed to reducing TSS (−08.36% and 82.25%), true color (44.46% and 82.31%), orthophosphates (63.1% and 86.59%), and BOD5 (−56.79% and 56.06%) during the dry and rainy seasons, respectively. 100% elimination of fecal streptococci (FS) and 74.89% and 43.80% of fecal coliforms (FC) were observed in the dry and rainy seasons, respectively. Significant ( P = 0.0019) FS elimination was more in the dry season than in the rainy season. However, the average residual content of FC (190,000 UFC/100 ml) was still higher than WHO limits (≤1000 UFC/100 ml) for nonrestrictive reuse in agriculture. E. crassipes can be efficiently used in lagoon systems for domestic wastewater treatment in the Western Highlands of Cameroon.

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Etat d’eutrophisation de la lagune continentale Ono (Bonoua sud-est de la Côte d’Ivoire) dans un environnement agro-industriel durant la crue du fleuve Comoé

Cited by 3 publications

References 3 publications

Eutrophication of a River Impacted by Agricultural Activities (N’zi River, Côte D’ivoire)

Eutrophication of a River Impacted by Agricultural Activities (N’zi River, Côte D’ivoire)

Actions combinées de Eichhornia crassipes et Pistia stratiotes pour traitement tertiaire de l’effluent des bassins facultatifs de la station d’épuration de Buterere, Burundi

Eichhornia crassipes Efficacy in Secondary Wastewater Treatment in the Western Highlands of Cameroon

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