Novel Biotreatment Process for Glycol Waters |
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Authors: | Raja L M V Elamvaluthy G Palaniappan R Krishnan R M |
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Institution: | 1.Centre for Research and Development, Southern Petrochemical Industries Corporation, Ltd., 628005, Tuticorin, India ; |
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Abstract: | 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. |
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Keywords: | Index Entries" target="_blank">Index Entries Glycols epoxides glycerol biodegradation Pseudomonas Aerobacter |
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