The Impact of Phosphate Mine Tailings on the Bioaccumulation of Heavy Metals in Marine Fish and Crustaceans from the Coastal Zone of Togo

Gnandi, Kissao; Tchangbédji, Gado; Killi, K.; Baba, Gnon; Abbe, K.

doi:10.1007/s10230-006-0108-4

Cited by 61 publications

(33 citation statements)

References 10 publications

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“…qui a fonctionné de 1893 jusqu'en 1993, a engendré des centaines de milliers de mètres cubes de terrils riches en métaux toxiques (mLAyAH et al, 2009;ZAiER, 1999). Plusieurs études ont montré que les mines de phosphates en Tunisie, comme dans le reste du monde, présentent des teneurs élevées en métaux (ANOUAR et al, 2006;BEJi SASSi et SASSi, 1999;GNANDi et al, 2006;TLiG et al, 1987). Dans le but de déterminer les éléments indésirables qui peuvent détériorer la qualité de l'eau, sept échantillons représentatifs ont été prélevés au niveau du terril de la mine de K. Kh (KK1-KK7).…”

Section: Mine De Phosphates De Kalaa Khasbaunclassified

Bassin d'oued Serrat : terrils et rejets domestiques, reconnaissance des métaux lourds et polluants, impact sur les eaux souterraines (nord-ouest de la Tunisie)

Mlayah

Silva

Hatira

et al. 2011

rseau

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Le présent travail visait à déterminer l'impact de rejets de deux mines de fer et de phosphates sur la qualité physicochimique de l'eau d'un système aquifère alluvial (nord-ouest de la Tunisie). Des échantillons de terrils, de sols ainsi que de l'eau de puits captant la nappe ont été prélevés et analysés. Les résultats d'analyses des échantillons de terrils ont montré que cette matrice renferme des concentrations remarquables en métaux lourds (essentiellement le Cd, Cr, Pb et Zn). Ces éléments métalliques ont été également détectés à des concentrations non négligeables dans la fraction fine des sols situés en aval des rejets miniers, suite à son transport éolien et hydrique. En ce qui concerne les eaux de la nappe, il s'avère que le transport des métaux issus des terrils est totalement atténué par les éléments constituant le sous-sol. Ces eaux, de bonne qualité géochimique, sont toutefois assez contaminées en nitrates dû aux pratiques agricoles intenses et à l'absence de systèmes d'assainissement urbains.The aims of this work were to determine the impacts of releases from two iron and phosphate mines (North West Tunisia) on the physico-chemical water composition of the related alluvial aquifer system. Samples from tailings, soil and water wells were collected and analyzed. The analytical results of tailing samples showed that this matrix contains high concentrations of heavy metals (mainly Cd, Cr, Pb and Zn). These metals were also detected at significant levels in the fine soil fraction downstream from the mine waste discharge due to transport by wind and water. The heavy metal concentrations in groundwater showed that the metal transport from the tailings is completely attenuated by the soil constituents. Overall, the physic-chemical quality of the groundwater is good, except for nitrates, which are present at relatively high concentrations due to intensive agricultural practices and the absence of urban wastewater treatment plants

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Section: Mine De Phosphates De Kalaa Khasbaunclassified

Bassin d'oued Serrat : terrils et rejets domestiques, reconnaissance des métaux lourds et polluants, impact sur les eaux souterraines (nord-ouest de la Tunisie)

Mlayah

Silva

Hatira

et al. 2011

rseau

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“…Extreme concentrations of Fe in near-shore marine waters can be expected to lead to bioaccumulation of Fe in fish and crustaceans to levels in excess of human consumption guidelines (cf. Gnandi et al 2006). It is stressed that no such cases have been reported in practice in relation to coal mine discharges.…”

Section: Issues Truly Relevant To Marine Environmentsmentioning

confidence: 90%

“…The limited data available are consistent with the conclusion that direct toxicity effects of Fe and Al in marine waters are likely to be negligible for all but the most extreme loadings (cf. Younger 2000; Gnandi et al 2006). Although Al is strongly toxic to freshwater organisms, it quantitatively precipitates as innocuous Al(OH) 3 wherever pH rises above 4.5-which is inevitable upon mixing with well-buffered sea water.…”

Section: Issues With Mine Water Discharge To Marine Environmentsmentioning

confidence: 98%

Towards Regulatory Criteria for Discharging Iron-rich Mine Water into the Sea

Younger

2008

Mine Water Environ

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Appropriate criteria are needed for regulating the discharge of mine water into the sea. Simply applying criteria developed for freshwater ecosystems to marine settings would be naïve and highly inappropriate because marine organisms have very different mechanisms for coping with high concentrations of cations than do freshwater species. Furthermore, the hydrodynamics and geochemistry of marine waters mean that certain processes that are very important in determining the magnitude of mine water impacts in freshwater ecosystems are largely irrelevant in the oceans. This is particularly the case relative to benthic smothering by ochre, which does not occur when mine waters are discharged to the sea. Visual impacts of mine water discharge are still important in marine systems, due to the possibility of developing unsightly ''slicks'' of suspended ochre on the water surface (albeit these are actually innocuous in ecological terms). Avoidance of ochre slicks is a common concern wherever ferruginous mine waters are discharged to coastal waters. Compilation of data from a range of case studies indicates that no visible plume of ochre would be expected where the rate of iron release is less than about 200 kg/day. Maintenance of iron loadings below this critical threshold can be ensured by calculating a target maximum iron concentration (Fe MAX , in mg/L) for the final effluent (which must be achieved by treatment if necessary) using the simple formula: Fe MAX = 2,314.8/Q MAX , where Q MAX is the maximum anticipated flow rate in litres per second from the mined system (pumped or flowing by gravity).

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“…According to Jarvis et al (1994), phosphate rocks contain many metal elements, some of them, are considered as impurities and therefore have negative impacts on the environment. Gnandi et al (2006) emphasize in their studies dealing with the environmental impacts of mining and processing of phosphates, that many diseases such as dental fluorosis in children are strongly linked to the presence of fluorine in phosphate rock.…”

Section: The Impact Of Phosphate Activities On the Environmentmentioning

confidence: 99%

Did Socially Responsible Investment Create the Added Value for the Company? A study Case in the Company of Phosphate of Gafsa

Tijani¹,

Hamadi²

2012

JOMS

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Undertake in a vision of social ethics, implies that the company must behave like a responsible citizen. For this propose, the company is now responsible for negative effects of its activities. That mean, the company must actively contribute to minimizing the risks by engaging the environmental projects. While these investments are a threat to performance for some companies, others consider them a competitive factor and a source of value creation.Through this study, the authors will demonstrate, through a case study, that socially responsible investing can be, contrary to what most entrepreneurs think, a lever of value creation for the company. Thus, the first part will discuss the concepts of socially responsible investments and the related objectives. The second part will present the calculations related to the environmental investments and determine the added value of environmental protection while discussing the results emerging from the case study of the Company of Phosphate of Gafsa.

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The Impact of Phosphate Mine Tailings on the Bioaccumulation of Heavy Metals in Marine Fish and Crustaceans from the Coastal Zone of Togo

Cited by 61 publications

References 10 publications

Bassin d'oued Serrat : terrils et rejets domestiques, reconnaissance des métaux lourds et polluants, impact sur les eaux souterraines (nord-ouest de la Tunisie)

Bassin d'oued Serrat : terrils et rejets domestiques, reconnaissance des métaux lourds et polluants, impact sur les eaux souterraines (nord-ouest de la Tunisie)

Towards Regulatory Criteria for Discharging Iron-rich Mine Water into the Sea

Did Socially Responsible Investment Create the Added Value for the Company? A study Case in the Company of Phosphate of Gafsa

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