Biodegradation of Effluents from Dairy Plant by Bacterial Isolates

Document Type: Research Article

Authors

1 Biochemical and Bioenvironmental Research Center (BBRC), Sharif University of Technology, P.O. Box 11365-6891 Tehran, I.R. IRAN

2 Department of Chemical and petroleum Engineering, Sharif University of Technology, P.O. Box 11365-6891 Tehran, I.R. IRAN

Abstract

Micro flora of the effluents from a dairy factory in Tehran(Pegah Dairy Processing Plant) were isolated and screened for their ability to reduce the organic matter content and COD of the effluents. 10 bacteria were selected due to  reduction in COD content from the 4th to 6th day of incubation at 30 °C and  pH =11. Highest COD reduction were obtained by two isolates, BP3 and BP4, 70.7 % and 69.5 %,, respectively (The initial COD concentration was 3000 mg/l and reduced to 880 and 920 mg/l).After optimization of the condition for test organisms, big reductions in COD, carbohydrate, fat and protein content of the effluents were observed by BP3 up to 84.70 %, 98 %, 45.30 % and 53 %, respectively .The mixture of BP3 and BP4 did not show the good results as the BP3 alone .Therefore, BP3 has been selected as the most efficient microorganism for the system.Theoverallefficiency of the system willbe increased if it is added toanaerobic activatedsludge tank.

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[1] Healy,  M. G., et al.,  “Biotreatment of Marine Crus-tancean and Chicken Egg Shell Waste”, Environmental Biotechnology: Principles and Applications, Kluwer, Academic Publishers, Printed  in the Netherlands, pp. 302-319(1995).

[2] Zamora, A. Z. and Lit, M. A. L., “Biodegradation of Effluents from Dairy Products Processing Plant”, Environmental Biotechnology: Principles and Applications, Kluwer, Academic Publishers, Printed in the Netherlands, pp. 481-490 (1995).

[3] Harrigan, W. F., “Laboratory Methods in Food Microbiology”, Academic Press, Third Edition (1998).

[4] Atlas, R. M., Handbook of Microbiological  Media, Second edition, edited by Parks, L. C., Academic Press, (1996).

[5] Guillen -Jimenez, E., et al., Bio- Mineralization of Organic Matter in Dairy Wastewater, as Affected by pH. The Evolution of Ammonium and Phosphates, Wat. Res., 34 (4), 1215 (2000). 

[6] Carata-Escobar, J., et al., Aerobic Purification of Dairy Wastewater in Batch Reactor, Process Biochemistry, 40 (2), p. 549 (2005).

[7]  Vidal, A., et al., Influence of the Content in Fats and Protein on the Anaerobic Biodegradability of Dairy Wastewater, Bioresource Technology, 74, 231 (2000).

[8] Alavez-Mateos, P., et al., Influence of the Inocolum and Initial pH on Dairy Effluent Biodegradation and Mineralization, Chem. Biochem. Eng. Q., 14 (3), 101 (2000).

[9] Viraraghavan, T. and Kikkeri, S. R., Effect of Temperature on Anaerobic Filler Treatment of Dairy Wastewater, Wat. Sci. Tech., 22 (9), 191 (1999).