CHARACTERIZATION AND PLIMINARY DESIGN OF A TANNERY WASTEWATER TREATMENT PLANT
2024
Adamu Dandajeh, Aliyu | Zainab Uyoh Abdullahi | Aliyu Ishaq | Abdullahi Umar
The tannery industry produces pollutants that possess physical, chemical, and biological characteristics, necessitating their characterization and treatment before being discharged into receiving streams. Effluent samples were sourced from the Nigeria Institute of Leather Science and Technology in Zaria, Nigeria, and the physico-chemical parameters were examined on a weekly basis for a duration of 7 weeks. The findings demonstrate pH values ranging from 7.64 to 10.45, while the temperature ranged from 22 to 28 oC. In addition, the alkalinity levels were found to range from 1900 to 5200 mg/l, acidity (900 to 6800 mg/l), BOD (120 to 600 mg/l), and total solids (390 to 9850 mg/l). Moreover, the dissolved solids were discovered to range from 210 to 6650 mg/l, suspended solids (172 to 2470 mg/l), chloride (250 to 2399 mg/l), phosphate (1.2 to 3.6 mg/l), nitrate (0.0 to 2.4 mg/l), cadmium (0.001 to 0.008 mg/l), chromium (0.788 to 1.665 mg/l), and lead (0.018 to 0.049 mg/l). On this note, a preliminary design for waste treatment reveal that 1 anaerobic pond (10.2 m length, 3.4 m breadth, and 3.0 m depth), 2 facultative ponds (21.45 m length, 7.15 m breadth and 1.5 m depth), and 1 maturation pond (16.89 m length, 5.63 m breadth, and 1.5 m depth) are required for effluent treatment with a land area of 435.92 m2. These results indicate that the effluents fail to meet the standards for discharge into surface water and land application. Keywords: characterization, effluent, pollutants, tannery industry, treatment
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