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Changes in Surface Water Physico-Chemical Parameters following the Dredging of Otamiri and Nworie Rivers, Imo State of Nigeria

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Author Affiliations

  • 1Department of pure and Industrial Chemistry, University of Port Harcourt, Rivers State, NIGERIA

Res.J.chem.sci., Volume 2, Issue (3), Pages 7-11, March,18 (2012)

Abstract

In an attempt to study the environmental impact of dredging on water quality, surface water quality parameters were monitored from June 2008 to October 2010. Samples were collected before and after dredging. Collected samples were analysed from five stations within the study area. The water physico-chemistry prior to dredging was consistent with that of researches done previously in that area. As a result of dredging however, the pH of the dredged canal was decreased from a mean value of 6.5 to 6.04, similarly dissolved oxygen(DO) decreased from 13.88mg/l to 8.66mg/l, while TSS, BOD5and COD5 decreased slightly after dredging. Acidity and alkalinity values did not show significant changes. Results of the ten-months post dredging monitoring of the Rivers water revealed that the water quality improved slightly during this period. The pH, DO, and TSS appreciated, while BOD5, COD5 turbidity, Total hardness, Acidity, Alkalinity, and Electrical conductivity depreciated to values close to pre-dredging concentration levels. We therefore concluded that the impact of dredging on the water quality is localised and short term.

References

  1. Iwuoha G.N., The impact of post dredging on surface water quality and sediment of Otamiri and Nworie rivers in Imo State of Nigeria. PhD thesis, university of Port Harcourt, Rivers State Nigeria (2011)
  2. Todd D.K., Ground water Hydrogeology 2nd edition. (1959)
  3. Toumazis A.D., environmental impact dumping of dredged material at sea; a case study of the Limasol Port extension works, Wat. Sci. Technol., 32, 9-10 (1995)
  4. Ohimain E.I., Environmental Impacts of oil mining activities in the Niger Delta mangrove ecosystem, In the proceedings of the International Mine Water Association (IMWA) conference held in Johannesburg, South Africa, Mine Water and the Environment, 503-517 (2003)
  5. Ohimain E.I., Preservation of Niger Delta Wetland Resources Through proper handling and Rehabilitation of Abandoned Waste Sulfidic Dredge Spoils, In: Environmental Science and Technology, 3-12 (2003)
  6. Ohimain E.I., Available options for the bioremediation and restoration of abandoned pyritic dredge spoils causing the death of fringing mangroves in the Niger delta, In: Biohydrometallurgy; a sustainable technology in evolution, 475-481 (2004)
  7. Ohimain E.I., Environmental impacts of dredging in the Niger Delta, options for sediment relocation that will mitigate acidification and enhance natural mangrove restoration, 97, 9-19 (2004)
  8. Ohimain E.I., Bioremediation of heavy metal contaminated dredged spoil from a mangrove ecosystem in the Niger Delta, Ph.D. thesis, University of Benin, Benin City, Nigeria, (2001)
  9. Mohsen M.Y., Mahmoud T.H., Amale, and Talaat A.S., Investigating the impact of flow conditions on metal content in the bed sediment, Thirteenth international water technology conference, IWTC, 13, 983-997 (2009)
  10. Elijah I.O., Tunde O., and Dorcas D.S., Changes in Water Physico-Chemical Properties following the Dredging of an Oil Well Access Canal in the Niger Delta, World Journal of Agricultural Sciences, 4(6), 752-758 (2008)