TITLE:
Physico Chemical Characterization of Tannery Effluent and Its Impact on the Nearby River
AUTHORS:
Haile Reda Amanial
KEYWORDS:
Modjo Tannery, Modjo River, Wastewater, Physicochemical Parameters, Water Pollution
JOURNAL NAME:
Open Access Library Journal,
Vol.3 No.3,
March
8,
2016
ABSTRACT: A study was conducted to characterize Modjo tannery effluent (wastewater)
and determine its impact on the Modjo River using some physicochemical
parameters. Accordingly, three tannery wastewater samples along wastewater
channel at different distances have been taken and three river water samples
(one upstream and two downstream) were collected along the river to determine
its impact on the river. The samples have been analyzed for temperature, pH,
electrical conductivity (EC), total dissolved solids (TDS), total suspended
solid (TSS), chloride(Cl﹣), biological oxygen demand (BOD5),
chemical oxygen demand (COD), total ammonia (as
N), total nitrogen, total phosphorus and sulphide. The result of tannery wastewater showed that the values of temperature,
pH, EC, TDS, TSS, Cl﹣, BOD5, COD, total ammonia, total nitrogen, total phosphorus and sulphide along the
wastewater channel ranged from 26.97℃ to 24.93℃,
9.33 to 8.33, 15,670.00 to 14,496.67 mg·L﹣1, 9370.00 to 8723.33 mg·L﹣1, 4979.33 to 2647.67 mg·L﹣1, 6111.67 to 5555.78 mg·L﹣1 , 960.34 to 842.00 mg·L﹣1,
2011.00 to 1950.75 mg·L﹣1, 520.44 to 401.23 mg·L﹣1,
720.46 to 665.43 mg·L﹣1, 30.12 to 19.55 mg·L﹣1, 35.56 to
21.05 mg·L﹣1 respectively. And most of the effluent characteristics except pH and temperature were
beyond the provisional discharge limit of tannery effluent to water body set by
the Ethiopian Environmental Protection Authority (EEPA) and Federal Environmental
Protection Agency (FEPA). Analysis of variance (ANOVA) also showed that
variation among sampling points was statistically significant (p