Impact of Tannery Effluent on the Self-purification Capacity and Biodiversity Level of a River

Bulletin of Environmental Contamination and Toxicology
Embialle MengistieIlse Smets

Abstract

The present study investigates the impact of tannery effluents on the self-purification capacity and the local macroinvertebrate community of one natural stream. As the concentration of chromium and sulfide increased from up- to downstream sites, the reduction of suspended solids, 5-days biological oxygen demand (BOD5), chemical oxygen demand and nitrification capacity decreased by 61 %, 21 %, 30 % and 74 %, respectively. Similarly, the share of Ephemeroptera, Plecoptera, and Trichoptera on the macroinvertebrate community decreased from 24 % to 0 %. Also the diversity (Simpson's) index and the correlation between the physicochemical parameters, BOD5 reduction, the macroinvertebrate abundance and the chromium concentration underpin the importance of the contamination by tannery effluents for the degradation of the stream habitat quality. In conclusion, although the physicochemical parameters indicate that the self-purification of the river can be maintained for a certain stream section, the biodiversity of the river is severely compromised.

References

Mar 1, 1992·Bulletin of Environmental Contamination and Toxicology·J A Camargo
Oct 1, 1996·Occupational Medicine·T L Guidotti
Jul 10, 1999·Archives of Environmental Contamination and Toxicology·H A LeslieM H Kraak
Jan 5, 2006·Archives of Environmental Contamination and Toxicology·Mwinyikione MwinyihijaKen Killham
Jan 1, 2013·Water Research·Ren-Cun JinBao-Shan Xing
Mar 13, 2014·Archives of Microbiology·Natella Mirzoyan, Harold J Schreier

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