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Research Journal of Environmental Toxicology

Year: 2017 | Volume: 11 | Issue: 3 | Page No.: 90-96
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Authors

T. Minuta

D. Jini

D. Jini

Keywords

Research Article

Impact of Effluents from Wet Coffee Processing Plants on the Walleme River of Southern Ethiopia

T. Minuta and D. Jini D. Jini's LiveDNA
Background and Objective: Ethiopia is one of the well-known coffee producing countries in the world. Coffee processing industries in Ethiopia are generating very high amount of pollution in the water resources because they are disposing its effluent to the nearby water course without any treatment. Therefore, the present study was conducted to evaluate the impact of effluents from wet coffee processing plants discharged into Walleme river. Materials and Methods: Water samples from 4 sampling stations were analyzed for pH, conductivity, total dissolved solids (TDS), total suspended solids (TSS), chemical oxygen demand (COD), biochemical oxygen demand (BOD5), total nitrogen, ammonium nitrogen (NH4+-N) and phosphate (PO43–). Sampling stations were designated as S1 (upstream station above effluent discharge point) and three downstream stations (S2, S3 and S4). One-way ANOVA was used for analysis of data. Results: The mean values for all analyzed parameters, except phosphates were significantly (p<0.05) higher at the stations found below the coffee effluent discharge points than the upstream one. TSS, total ammonia, total nitrogen, COD, BOD5 and pH were found to exceed the maximum permissible limit (MPL) set both by Ethiopian Environmental Protection Agency and World Health Organization (WHO). Conclusion: The study has clearly indicated that the water quality of the river was significantly affected by the discharge of un-treated effluents and by-product from coffee washed plants. Therefore, urgent interference should be taken for effluent management options to avoid further needless damage to the environment.
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