Novel Biotreatment Process for Glycol Waters
Propylene oxide (PO), propylene glycol (PG), and polyols are produced from propylene via propylene chlorohydrin. Effluents from these plants contain biological oxygen demand/chemical oxygen demand (BOD/COD) loads besides high chloride concentrations. The high salinity poses severe problem to adopt conventional methods like activated sludge processes. Presently, a simple, economically viable and versatile microbiological process has been developed to get more than 90% biodegradation in terms of BOD/COD, utilizing specially developedPseudomonas andAerobacter. The process can tolerate high salinity up to 10 wt% NaCl or 5 wt% CaCl2 and can withstand wide variations inpH (5.5–11.0) and temperature (15–45°C). The biodegradation of glycols involves two steps. The enzymatic conversion of glycols to carboxylic and hydroxycarboxylic acids is aided byPseudo- omonas. Further degradation to CO2 and H2O by carboxylic acid utilizingAerobacter, and possible metabolic degradative pathway of glycols are discussed. Various process parameters obtained in the lab scale (50 L bioreactor) and pilot scale (20 m3 bioreactor), and unique features of our process are also discussed.
Index EntriesGlycols epoxides glycerol biodegradation Pseudomonas Aerobacter
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- 1.Abele, L., Brochhagen, F. K., and Walber, U. (1984), Polyurethane Hand- book, Gunter, Oertel, ed., Hanser Publishers, Munich, Vienna, New York, 599–603.Google Scholar
- 2.Noel, R. Krieg and Holt, J. G. (1984), Bergey’s Manual of Systematic Bacteriology, Williams and Wilkins, Baltimore, MD.Google Scholar
- 3.Greenberg, A. E., Trussell, R. R., and Cleseeri, L. S., eds. (1985),Standard Methods for the Examination of Water and Waste Water. Amer. Pub. Health Assn., Washington, DC.Google Scholar
- 4.Baumann, F. J. (1974),Anal. Chem. 46, 1337.Google Scholar
- 5.Burns, E. R. and Marshall, C. (1965),Water Pollut. Control Fed. 37, 1716.Google Scholar
- 6.Cripps, J. M. and Jekins, D. A. (1964),Anal. Chem. 36, 1240.Google Scholar
- 8.Woodring, S. L. and Clifford, D. A. (1980),J. Water. Pollut. Control Fed. 60, 537.Google Scholar
- 9.Yoshitake, Tanaka, Fujii, K., Tanaka, A., and Fukui, S. (1975),J. Ferment. Technol. 53, 354–362.Google Scholar
- 10.Huff, E. and Rudhey, H. (1959),J. Biol. Chem. 234, 1060.Google Scholar
- 11.Levenspiel, O. (1969),Chemcial Reaction Engineering, Wiley Eastern, New Delhi, 150–152.Google Scholar
- 12.Atkinson, B. and Mavituna, F. (1983), Biochemical Engineering and Biotechnology Handbook, The Nature Press, USA, 620–624.Google Scholar