Experimental investigation of the external nitrification biological nutrient removal activated sludge (ENBNRAS) system

Biotechnology and Bioengineering
Zhi-rong HuG A Ekama

Abstract

A systematic lab-scale experimental investigation is reported for the external nitrification (EN) biological nutrient removal (BNR) activated sludge (ENBNRAS) system, which is a combined fixed and suspended medium system. The ENBNRAS system was proposed to intensify the treatment capacity of BNR-activated sludge (BNRAS) systems by addressing two difficulties often encountered in practice: (a) the long sludge age for nitrification requirement; and (b) sludge bulking. In the ENBNRAS system, nitrification is transferred from the aerobic reactor in the suspended medium activated sludge system to a fixed medium nitrification system. Thus, the sludge age of the suspended medium activated sludge system can be reduced from 20 to 25 days to 8 to 10 days, resulting in a decrease in reactor volume per ML wastewater treated of about 30%. Furthermore, the aerobic mass fraction can also be reduced from 50% to 60% to <30% and concommitantly the anoxic mass fraction can be increased from 25% to 35% to >55% (if the anaerobic mass fraction is 15%), and thus complete denitrification in the anoxic reactors becomes possible. Research indicates that both the short sludge age and complete denitrification could ameliorate anoxic aerobic (AA) or low fo...Continue Reading

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Citations

Jul 2, 2003·Water Research·Zhi-rong HuG A Ekama
May 22, 2007·Biotechnology and Bioengineering·Zhi-rong HuG A Ekama
May 22, 2007·Biotechnology and Bioengineering·Zhi-rong HuG A Ekama
Feb 16, 2006·Biotechnology and Bioengineering·Alessandro MontiHarlan G Kelly
Jul 4, 2007·Water Environment Research : a Research Publication of the Water Environment Federation·Alessandro MontiHarlan G Kelly

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