Determination of Chromium (III) and Chromium (VI) In The Tannery Effluents of Awash and Addis Ababa Leather Industries
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Date
2006-07
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Addis Ababa Universty
Abstract
The study area located in the two leather industries namely Addis Ababa leather industry
and ELICO-Awash Tannery. The Addis Ababa leather industry is located 18 km of
south-west of the Addis Ababa city, where as the ELICO-Awash tannery is located to the
Southern part of the city. The two industries were located to the riversides and their
leather processing wastes joins to the water systems. High tannery waste disposal,
channeling residual water mixes to the water system.
Water samples were collected from three sites of each leather industry for three days and
for three different times a day. Sample collection time was scheduled according to the
discharging time of the tannery process. The level of chromium species (Cr(III) and
Cr(VI)) were determined using two analytical methods. Total chromium concentration of
the water samples were determined by FAAS. The concentration of total chromium
varies significantly at the three different site of each of the two leather industries. There
was high concentration of chromium at the discharge point of Addis Ababa leather
industry than that of the Awash tannery. The same trends were also observed for the rest
of the sites. The level of chromium was also not the same when the result of the samples
collected at different time was observed.
The amount of Cr(VI) in the down streams of the two leather industries ranges from
0.01ppm to 0.15 ppm, which was not above the permissible level that is allowed to the
natural wate
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Keywords
Chromium (III) and Chromium (VI)