Treatment of Waste Water Effluent from Coffee Industry using Anaerobic Mixed Culture Pseudomonas Florescence and Escherichia Coli Bacteria and with Gypsum: A Case in Dilla- Ethiopia
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Date
2019-06
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Addis Ababa University
Abstract
Coffee processing industries generate huge amount of wastewater. The effluent is characterized
by a lot of sludge, high amount of organic load and acidic nature due to fermentation process.
Due to this, it contains high value of COD, BOD, TS and other contaminants. This effluent when
disposed in natural water, it contaminates aquatic animals and plants environment. So, care has
to be taken to ensure the quality of the releasing waters should be reduced below the prescribed
standards. There are many physical and chemical treatment methods available for the removal of
pollutants but all these methods have problems associated with secondary effluent, hazardous
and harmful end products, high energy consuming, non-economic etc. These problems can be
overcome by the use of biological treatment methods which are simple, eco-friendly and efficient
where complete removal of the pollutants is possible. Cognizant of this, the researcher was
initiated to study the treatment of wastewater effluent from coffee industry in the specific area by
using anaerobic Pseudomonas florescence and Escherichia coli bacteria as mixed culture and
with gypsum (CaSO4.2H2O). In this study, the wastewater value of BOD5, COD, TS and
neutralization of the PH reduction was achieved. The results show that the treatment reduced
BOD5, COD and TS from its initial concentration of 320.26 mg/l, 1261 mg/l, and 3545 mg/l to
35.66 mg/l, 97 mg/l and 68 mg/l respectively. The treatment in the study shows 87.74% reduced
of BOD5 load, 92.02% reduced of COD and 98.01% reduced of TS from the initial load using
optimization of the treatment method. Therefore, it can be concluded that mixed culture bacteria
of Pseudomonas florescence and Escherichia coli in combination with gypsum as a new
effective treatment having potential for BOD5, COD and TS reduce from the effluent treated.
The mixed culture of microorganisms is capable to reduce the contaminants that made the
approach cost effective, time saving compared with other results found by other authors without
mixed culture. The microorganisms included in the study can be applied for the treatment of
effluents containing the multiple contaminants.
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Keywords
Effluent, Treatment, Anaerobic Microorganism, Mixed culture, Gypsum