Investigation of Biological Nutrient Removal within the University of Cape Town Process

Blackburne, Richard (2001). Investigation of Biological Nutrient Removal within the University of Cape Town Process Honours Thesis, School of Engineering, The University of Queensland.

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Author Blackburne, Richard
Thesis Title Investigation of Biological Nutrient Removal within the University of Cape Town Process
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2001
Thesis type Honours Thesis
Supervisor Zhiguo Yuan
Total pages 85
Language eng
Subjects 0904 Chemical Engineering
Formatted abstract
Phosphorous effluent quality was not affected by any operational parameters of then UCT Process because the influent quantity was very low. Ammonium concentration was found to reduce to very low values with high DO concentration and SRT but was unaffected by the r-recycle ratio. The effluent Nitrate concentrations showed opposite trends to the Ammonium concentration.

The effects of Nitrification and Denitrification were easily recognised in all results. Nitrification was identified by analysis of the Ammonium and Nitrate concentrations. It resulted in Ammonium concentration decreasing while the Nitrate concentration increased, as expected. Nitrification was found to increase with increasing DO concentration and SRT but was largely unaffected by r-recycle ratio. Denitrification was limited by the amount of soluble biodegradable COD within the effluent. Hence the concentration of Nitrate in the Anoxic reactor was not zero (constraint of the UCT Process) but still low.

Phosphate reactions were found to be intertwined and effects were difficult to identify. Phosphorous uptake was unaffected due to the low amount of Phosphorous in the influent but effects would be recognisable if higher Phosphorous were present. The major negative effect that would lead to poor Phosphorous removal is excessive depletion of PHA at the end of a cycle.

These trends may be used to anticipate appropriate operational set points for maximum nutrient removal based on influent qualities.

The testing process involved using a computer model of the UCT Process to analyse the effects various operational parameters have on nutrient removal. The model used the ASM2d (Henze et al., 1999) to describe the biological reactions and a point settler.
Keyword Nutrient Removal

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Thu, 08 Jan 2015, 11:28:46 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service