A study of physicochemical and biological treatment of pharmaceutical wastewater by the activated sludge process was performed in an oxidation ditch. The physicochemical study using different coagulants revealed that all the coagulants used are not effective and their doses required were very high for COD reduction. In the biological oxidation study, it was found that the wastewater could be processed at all organic loadings and phenol concentrations encountered in wastewater. The yield coefficient and decay coefficient were 0.75 (COD basis) and 0.01 day−1 (COD basis), respectively.
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Mayabhate, S.P., Gupta, S.K. & Joshi, S.G. Biological treatment of pharmaceutical wastewater. Water Air Soil Pollut 38, 189–197 (1988). https://doi.org/10.1007/BF00279597
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