Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 17, No. 3 (October 2004) 209-218   

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  TREATMENT OF WASTEWATER CONTAINING CARBOHYDRATES USING PICHIA SAITOI CULTURE
 
T. Amani

Biochemical and Bioenvironmental Engineering Research Center, Sharif University of Technology
Tehran, Iran


S. Yaghmaei and V. Maghsoodi

Department of Chemical and Petroleum Engineering, Sharif University of Technology
Tehran, Iran, yaghmaei@mehr.sharif.edu
 
 
( Received: September 14, 2003 – Accepted in Revised Form: August 19, 2004 )
 
 

Abstract    Treatment of wastewater containing carbohydrates by Pichia saitoi growing on beet molasses was investigated in a well-mixed continuous tank as an alternative to bulking control.The yeast strain that used in this work was isolated from non-alcoholic beverage industrial wastewater, with a view on TOC removal compared with other strains in previous study.In this research the isolated yeast showed high COD and TOC removal at three hydraulic retention times, HRT= 48, 24 and 18 hours.Maximum COD and TOC reductions were obtained at HRT=48 hours, which were 96% and 88%, respectively.The influent COD and TOC were 2500 and 148 mg/l, respectively.The pH maintained for synthetic wastewater was about 9.The changes of pH within the aeration tank at each HRT was monitored.Effects of organic loading rate (OLR) on COD and TOC reduction efficiencies were studied in this work.Aeration rate was between 0.2-0.25 vvm, which was very low in comparison to the other studies.This yeast strain had high settling ability (maximum SVI was observed at 60 ml/g) and also high F/M ratios (maximum of F/M was 2.9 kg COD/kg MLSS.day).

 

Keywords    Bulking, Carbohydrates, Pichia Saitoi, Activated Sludge

 

References   

 
1. Metcalf and Eddy, “Wastewater Engineering”, 3rd Ed.,McGraw-Hill, Chapter 8, (1991).

2. Yaghmaei, S., “Studies on Treatments of Carbonaceous Wastewater by Fixed Film Aeration Tank”, Scientia Iranica, Vol. 9, No. 1, (2002), 47-52.

3. Wanner, J., “Activated Sludge Bulking and Foaming Control”, Technomic Publication, Pennsylvania, USA, (1994), 70-72.

4. Great, K., “Environmental Engine-erring”, McGraw- Hill, (1996).

5. Chudoba, J., “Activated Sludge Bulking Control”, Encycloped-ia of Environmental Control Technology, Vol. 3, Wastewater Treatment, P. N. Cheremision off, 2nd Ed. Gulf, Houston, Tx., (1989), 171-202.

6. Bitton, G., “Wastewater Microbiology”, 2nd Ed., University of Florida, Gainesville, (1999).

7. Levenspiel, O., “Chemical Reaction Engineering”, 3rd Ed., John Wiley and Sons, (1999).

8. Maghsoodi, V., “Biological Pretreatment of a Beverage Waste Using Yeast Isolated from the Factory Sludge”, International Journal of Engineering, Vol. 15, No. 3, (October 2002), 223.

9. Ralph, L., Stephenson, J. and Blackburn, Jr. B., “The Industrial Wastewater System Handbook”, Lewis Publisher, (1997).

10. APHA, AWWA and WPCF, “Standard Methods for the Examination of Water and Wastewater”, 18th Ed., (1992).

11. Beausejour, D. and Leduy, A., “Batch Cultivation of Kluyveromyces fragilis in Cheese Whey”, The Canadian Journal of Chemical Engineering, Vol. 59, (August 1981).





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