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Bioaugmentation effect of Aeromonas hydrophila and Pseudomonas putida on kinetics of activated sludge process in treating pharmaceutical industrial wastewater

BACKGROUND: Pharmaceutical industrial wastewater represents a challenge for biological treatment due to complexity in its composition. This research investigates the bioaugmentation effect of indigenous bacterial strains on kinetics of activated sludge process in treatment of real high‐strength pharmaceutical industrial wastewater. RESULTS: Two bacterial strains were isolated from pharmaceutical effluent and identified as Aeromonas hydrophila and Pseudomonas putida. The highest removal efficiency of dissolved organic matter from pharmaceutical wastewater was 71.43% within 24 h, obtained by bioaugmented activated sludge with P. putida, at the initial concentration of activated sludge 4.39 ± 0.37 g L−1. The biokinetic parameters of biodegradation process were calculated using Endo‐ Haldane model, where bioaugmented activated sludge showed higher affinity to pharmaceutical wastewater. CONCLUSION: Biodegradation process of high strength pharmaceutical wastewater showed enhancement through bioaugmentation of activated sludge with indigenous bacterial isolates. Considering the increasingly demand for pharmaceuticals on global scale, bioaugmentation potential of A. hydrophila and P. putida could contribute to enhancement of biodegradation in means of reduction in process time and environmental impact.

bioaugmentation ; activated sludge ; pharmaceutical wastewater ; kinetics ; Aeromonas hydrophila ; Pseudmonas putida

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