Browsing by Author "Tibebu, Addisu"

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    Characterization the phsico-chemical of textile industries effluent discharge on environment in Oromia region, Ethiopia
    (Addis Ababa University, 2020-06) Tibebu, Addisu; Damene PhD, Shimeles
    Textile wastewater mixed with various contaminants at different ranges. Therefore, environmental legislation commonly obligates textile factories to treat these effluents before discharge into the water bodies. The effluent treatment plant is designed to remove certain pollutants found in the effluent of textile industry. Therefore this study focuses on the Evaluation of phsico-chemical characteristics of textile industries effluent discharge on environment in Oromia region, Ethiopia. Samples of raw effluent discharged were collected from the outlet after different levels of treatment plants (primary, secondary, and tertiary) and analyzed by standard laboratory methods. The laboratory data were statistically analyzed using simple descriptive statistics and one-way ANOVA. The analyzed data was presented by using tables and graphs compared with World Bank and Ethiopian guidelines standard for textile wastewater. The physicochemical characteristics of the textile wastewater fluctuated depending on the level of the textile treatment plant. The one way ANOVA taste result showed that pH, COD, TSS, S-2 , TP, TN, TNH3 - and Phenols exhibited statically significant differences across sampled textile industries with different levels of environmental treatment plants (ETPs). However, the Post Hoc tests based multiple comparisons revealed that statistically insignificant differences were observed in the case of the concentration of heavy metals (Copper, Lead, and Chromium) in the textile wastewater having different levels of ETP. The analysis revealed that most pollutants such as pH, chemical oxygen demand (COD), total suspended solids (TSS), Sulfide (S-2 ), total phosphorus (TP), total nitrogen (TN), Total Ammonia (TNH3 - ), Phenols, Copper (Cu) and Chromium (Cr) form the textile factories that passed the different ETP were found above the permissible limit of World Bank Environmental, Health and Safety Guideline of Textile Manufacturing (EHSGTM) and Ethiopian guidelines standard. Therefore, the textile industries should improve the performance of the wastewater treatment plants to minimize the possible pollution. In this regard, the industries should balance the inlet and outlet to the existing effluent designed capacity level treatment, properly dose treatment chemicals and understand basic concepts of ETP operational process and better to using from preliminary treatment technology up to advanced treatment technology. In addition to this, it is better to recycle wastewater. The relevant government bodies also need to do regular monitoring and enforcement of environmental laws and regulations as per the national standard.