SPIC Glycol Biohydrolysis (GBT) Process, Petrochemical Industries, Propylen Oxide, Propylene Glycol, Propylene

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	SPIC glycol biotreatment (GBT) process. In petrochemical industries, propylene oxide (PO), propylene glycol (PG) and polyols are produced from propylene and are released in the effluents. These effluents have high biological oxygen demand (BOD) and chemical oxygen demand (COD), besides high chlorine concentration. This process developed by SPIC and known as ‘glycol biotreatment process’ involves the use of mixed culture of Pseudomons and Aerobacter which have a synergistic effect. The treatment allows more than 95% biodegradation in terms of BOD/COD.
The biodegradation of glycols involves two steps: (i) conversion of PO/PG to volatile two (e.g., lactic acid, pyruvic acid and formic acid) with the help of Pseudomonas and (ii) degradation of volatile acids into CO₂ and H₂O with the help of Aerobacter The above glycol biotreatment process for treating PO/PG/Polyol effluents is the first in the world. The captical cost is half that of imported known-how based on activated sludge process (ASP). The commercial plant has already been contruced at Manali Petrochemical Ltd. (MPL) Madras and was commissioned in March, 1991. A saving of Rs. 2.10 per kg of COD is achieved in the treatment. When compared with ASP. This process also earned several awards