Authors: Xiang Hu, Yanfang Shi, Jianlong Wang
Addresses: Department of Environmental Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China. ' Department of Environmental Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China. ' Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China
Abstract: In this paper, the bio-activity of activated sludge was investigated using Oxygen Uptake Rate (OUR) as an indicator. The activity of ammonium oxidation and COD removal of both attached- and suspended-growth sludge was determined under different temperature and organic loading rates. The experimental results indicated that at 5°C, the nitrification activity was about 60% of that at 18°C. The nitrification activity of attached sludge was 20-30% lower in comparison with suspended sludge. The denitrification rate of sludge in zones I and II was 0.44 mg NO3−/g MLSS•h and 0.63 mg NO3−/g MLSS•h, respectively, which revealed that the denitrification activity of sludge-II was higher compared with sludge-I, the results also indicated that the accumulation of nitrite was very low.
Keywords: moving-bed biofilm reactors; oxygen uptake rate; nitrification; denitrification; municipal wastewater; wastewater treatment; bioactivity; activated sludge; ammonium oxidation; COD removal; chemical oxygen demand.
International Journal of Environment and Pollution, 2009 Vol.37 No.2/3, pp.177 - 185
Published online: 13 May 2009 *Full-text access for editors Access for subscribers Purchase this article Comment on this article