Evaluation of the efficiency of activated sludge process with extensive aeration and sludge return in reducing the COD of effluent of beverage industries

Document Type : Research Article

Authors

1 Department of Civil Engineering, Faculty of Engineering, University of Birjand, Birjand, Iran

2 Associate Professor, Faculty of Engineering, Civil-Environmental Department of Birjand University

3 Department of Civil Engineering-Environment-Faculty of Engineering-Birjand University-Birjand-Iran

4 Department of Civil-Environment, Faculty of Engineering, University of Birjand, Birjand, Iran

Abstract

The effluent of the beverage industry has a higher yield, which is biological. Locations The overall objective of this study is to evaluate the efficiency of the activated sludge process with extensive aeration and sludge return to reduce the COD of beverage industry effluents. For evaluation, a 20-liter tank was completely used anaerobically, from which the artificial effluent was transferred to the pilot. The organic load increased from 1.03 kgCOD/m3.day to 1.93 kgCOD/m3.day. In this study, the COD parameter was used to measure the pollution of the beverage industry effluent and its working cycle was 24 hours. Hydraulic retention time, temperature and pH were also measured. The results of this process showed that with a final organic load of kg COD/m3.day of 1.93, the removal efficiency was 90%, which is part of the removal efficiency (20 to 30%) of the anaerobic tank used in the first pilot. By examining the hydraulic retention times of 6, 12, 18 and 24 hours, the highest efficiency was obtained in the retention time of 24 hours and in the research process, the pH was between 7 and 9 and the temperature was in the mesophilic range. Therefore, it can be concluded that the process of activated sludge with extensive aeration and sludge return is effective in the treatment of effluents of beverage industries with medium organic load.

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Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 6
September 2022
Pages 2343-2352

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