Heavy Metal Concentrations in some Biotic and Abiotic Components of the Olezoa Wetland Complex (Yaoundé-Cameroon, West Africa)

Fonkou, Théophile; Agendia, Philip; Kengne, Ives Magloire; Akoa, Amougou; Derek, Focho; Nya, Jean; Dongmo, Francois

doi:10.2166/wqrj.2005.048

Cited by 21 publications

(14 citation statements)

References 16 publications

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“…Concerning the removal capacity of P. stratiotes for various nutrients from the WSR during all seasons tested, the values of nutrient removal observed after ten days of experimentation (TKN = 22–91%, N‐NH 4 + = 96–99%, P‐PO 4 3− = 95–99%, N‐NO 3 − = 17–98%) are similar or even higher to those that have been reported in other studies performed with this species .…”

Section: Discussionsupporting

confidence: 84%

Dual Purpose System for Water Treatment From a Polluted River and the Production of Pistia stratiotes Biomass Within a Biorefinery

Robles-Pliego¹,

Olguín²,

Hernández-Landa³

et al. 2015

CLEAN Soil Air Water

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The use of lagoons with floating aquatic plants for the treatment of a polluted urban river with recovery of Pistia stratiotes biomass was investigated. A first group of experiments was performed during spring, comparing three different media: synthetic wastewater (SWW), water from the Sordo River (WSR), and WSR amended with fertilizer (WSR + F). The second and third experiments were performed during summer and winter, respectively, using only WSR. During spring, the productivity in WSR and WSR + F was similar between them and significantly higher compared to the one observed in the SWW: 0.949 versus 0.379 g dry weight (dw) m−2 day−1, respectively. During summer, the productivity in the WSR was similar to the one observed in spring but significantly different to the one registered in winter: 0.946 versus 0.347 g dw m−2 day−1. During spring and summer, the uptake rate of ammonium nitrogen was significantly higher compared to the one registered for nitrate, although in winter there were no differences between such rates. For phosphates, the removal percentage was similar in spring and winter (96.25 and 99.1%, respectively). It was concluded that this system serves a dual purpose, treating water from a polluted river effectively and producing high biomass yield during spring and summer.

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Section: Discussionsupporting

confidence: 84%

Dual Purpose System for Water Treatment From a Polluted River and the Production of Pistia stratiotes Biomass Within a Biorefinery

Robles-Pliego¹,

Olguín²,

Hernández-Landa³

et al. 2015

CLEAN Soil Air Water

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“…Furthermore, the concentrations of the heavy metals in the water were below those in the fish tissues which may be due to bio-accumulation. Similar findings by Fonkou et al (2005), Senarathne and Pathiratne (2007), Mohammed et al (2009) and Abdel-Baki et al (2011) also showed that the metal levels in fish were higher than the levels in both water and sediment, thus indicating bioaccumulation. However, there was no particular trend in the concentrations of heavy metals in all the fish organs with time.…”

Section: Discussionsupporting

confidence: 62%

Fish (Arius heudelotii Valenciennes, 1840) as bio-indicator of heavy metals in Douala Estuary of Cameroon

Fonge¹

2011

Afr. J. Biotechnol.

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This study assessed and monitored accumulation levels of heavy metals (Fe, Pb, Cu, Zn and Mn) in a prominent benthic mangrove fish species (Arius heudelotii Valenciennes, 1840) from the Douala Estuary, Cameroon. Fish species selection was based on signs of deterioration in taste and texture. Sampled estuarine water and tissue parts (liver, gut, flesh, gills and bones) of the captured fish were analyzed using atomic absorption spectrophotometer. The results show that concentration of the heavy metals except Mn in water was below the permissible limits imposed by WHO and USEPA for aquatic life. The metal levels in fish collected were significantly higher (p<0.05) than the levels in water, indicating bioaccumulation. Metal levels in the fish organs varied considerably with the highest mean concentrations of Pb and Zn found in the flesh and gills. The high concentration of heavy metals in these parts makes the fish unsafe for consumption as the majority of consumers depend on these parts for their livelihood. This calls for environmental surveillance and monitoring of these water bodies and their surrounding environment.

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“…In many cases, sewage from industries and agglomerations is piped or drained into the nearby aquatic ecosystems. As a result, surface and ground water are heavily polluted (Fonkou et al, 2005a).…”

Section: Introductionmentioning

confidence: 99%

Performances of a Yard-Scale Surface Flow Wetland Vegetated with Echinochloa Crus-Pavonis in the Removal of Nutrients and Faecal Bacteria from Domestic Wastewater

Fonkou

Lekeufack

Teguimdje

2013

JBLS

Self Cite

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Several macrophytes are being tested in experimental wetlands systems in Cameroon, for the treatment of domestic wastewater. The aim of the present research was to assess the performances of a yard scale surface flow wetland vegetated with Echinochloa crus-pavonis, ISSN 2157-6076 2013 www.macrothink.org/jbls 252 in the removal of nutrients and faecal bacteria from primarily treated effluent. A wetland vegetated with the macrophyte and a non-vegetated wetland (control) were continuously fed with primarily treated domestic wastewater at organic loading rates varying from 20.74 to 27.15 g BOD/m 2 /day in dry season and the rainy season for two consecutive years. Journal of Biology and Life SciencePhysicochemical and microbiological characteristics of water were monitored at the entries and exits of the wetlands alongside the growth attributes of the young plants during each season. Plant densities in the bed increased with time during each season of the experiment, and not significantly lowered during the following season after harvest. Percentage removal ranges of 89-95 % and 75-93 % were observed for faecal bacteria during the dry and the rainy seasons respectively in the vegetated beds, as compared to ranges of 25-71 % and 24-73 % recorded in the control bed. The same trend was observed for nitrates and orthophosphates with removal rates of up to 62 % and 82 % respectively as compared to 40 % and 47 % recorded in the control. The vegetated bed was significantly more efficient than the control in the reduction of several parameters, but this varied with seasons.

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Heavy Metal Concentrations in some Biotic and Abiotic Components of the Olezoa Wetland Complex (Yaoundé-Cameroon, West Africa)

Cited by 21 publications

References 16 publications

Dual Purpose System for Water Treatment From a Polluted River and the Production of Pistia stratiotes Biomass Within a Biorefinery

Dual Purpose System for Water Treatment From a Polluted River and the Production of Pistia stratiotes Biomass Within a Biorefinery

Fish (Arius heudelotii Valenciennes, 1840) as bio-indicator of heavy metals in Douala Estuary of Cameroon

Performances of a Yard-Scale Surface Flow Wetland Vegetated with Echinochloa Crus-Pavonis in the Removal of Nutrients and Faecal Bacteria from Domestic Wastewater

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