Abstract
A fragrance manufacturing wastewater is to be treated using a flowsheet which includes combined equalization and organics stripping, biological treatment followed by catalyzed chemical oxidation and waste sludge handling. Two biological processes were investigated for comparison. The first was a conventional extended aeration process, using a bench-scale reactor; the second was a cyclically operated activated sludge system batch reactor using a demonstration unit on-site. Operating parameters for generating an effluent quality of around 600 mg/L COD, through biological treatment, were established. It was found necessary to adjust the feed substrate concentration with a concentrated wastewater component to support microbial growth. The combined fragrance manufacturing waste stream was characterized by an initial COD of around 23000 mg/L. The treatment facility is required to meet a 300 mg/L COD, 175 mg/L BOD and 250 mg/L TSS effluent quality by the regulatory authorities. Satisfactory removal of residual COD to meet the discharge specification was obtained in bench tests using catalyzed chemical oxidants following biological treatment. The design intent of the full-scale facility is 38000 litres/day.
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