Abstract
A study was conducted to investigate the sediment health and water quality of the River Sagana, Kenya, as impacted by the local tanning industry. Chemical analysis identified the main chemical pollutants (pentachlorophenols and chromium) while a bioassay addressed pollutant bioavailability. The bioassay, exploiting the luminescence response of a lux marked bacterial biosensor, was coupled to a dehydrogenase and Dapnia magna test to determine toxicity effects on sediments. Results highlighted the toxicity of the tannery effluent to the sediments at the point of discharge (64% of control bioluminescence) with gradual improvement downstream. There was a significant increase in dehydrogenase downstream, with the enzyme activity attaining a peak at 600 m, also indicating a gradual reduction of toxicity. Biological oxygen demand (19.56 mg L−1) dissolved oxygen (3.97 mg L−1) and high lethal dose value (85%) of D. magna also confirmed an initial stress at the point of discharge and recovery downstream. Optical density of surface water demonstrated an increase in suspended particulates and colour after the discharge point, eventually decreasing beyond 400 m. In conclusion, the study highlighted the importance of understanding the biogeochemistry of river systems impacted by industries discharging effluent into them and the invaluable role of a biosensor-based ecotoxicological approach to address effluent hazards, particularly in relation to river sediments.
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The Kenya government is acknowledged for funding the study, and the University of Aberdeen is acknowledged for logistic support. The valuable comments by the anonymous reviewers are also acknowledged.
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Mwinyihija, M., Meharg, A., Dawson, J. et al. An Ecotoxicological Approach to Assessing the Impact of Tanning Industry Effluent on River Health. Arch Environ Contam Toxicol 50, 316–324 (2006). https://doi.org/10.1007/s00244-005-1049-9
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DOI: https://doi.org/10.1007/s00244-005-1049-9