Quick Cultivation of Micro-Aerobic Granular Sludge for Simultaneous Nitrogen Removal

Abstract:

In order to accelerate the cultivation of micro-aerobic granular sludge for domestic sewage treatment, an expanded granular sludge bed (EGSB) reactor seeded with excess sludge was employed. It was found that micro-aerobic granules can form and grew compact within one month, and remained stable during the later operation, the mature cultivation had average particle size of 0.81mm, and 64% of the granules had settling velocity above 35m•h^-1. Moreover, excellent COD and nitrogen removal were obtained. For hydraulic retention time (HRT) of 5h, as the recirculation ratio and oxygenation rate were set at 6.5 and 0.25g•L^-1d^-1 respectively, COD removal ranged in 80%-91%, leaving effluent COD below 50mg•L^-1. The removal efficiency of ammonium and total nitrogen (TN) were 72%-89% and 76%-87%, respectively with effluent concentration down to 3-12mg•L^-1 and 5-14mg•L^-1. Results showed that the efficiency of simultaneous nitrogen removal was much influenced by effluent recirculation and oxygenation rate in micro-aerobic EGSB reactor.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1239-1242
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1239
• Online since: December 2011
• Authors: Xiao Liu, Li Na Guo
• Keywords: Expanded Granular Sludge Bed (EGSB) Reactor, Micro-Aerobic Granular Sludge, Oxygenation Rate, Simultaneous Nitrogen Removal

References

[1] X. W. Liu, G. P. Sheng and H. Q. Yu: Biotechnol Adv. Vol. 27(2009), p.1061

[2] L.B. Chu, X.W. Zhang, F.L. Yang and X.H. Li: Desalination. Vol. 189 (2006), p.181

[3] N. Weissenbacher, C. Loader, K. Lenz, S. N. Mahnik, B. Wett and M. Fuerhacker: Water Res. Vol. 41(2007), p.397

[4] L.B. Chu, X.W. Zhang, X.H. Li and F.L. Yang. Desalination. Vol. 72 (2005), p.271

[5] A. Mosquera-Corral, M.K. de Kreuk, J.J. Heijnen and M.C.M. van Loosdrecht: Water Res. Vol. 39(2005), p.2676

[6] Chinese NEPA: Water and wastewater monitoring methods, 4th, Chinese Environmental Science Publishing House, Beijing, 2003, In Chinese

[7] Y. L.iu, H. L. Xu, Sh. F. Yang, and J.H. Tay: Water Res. Vol. 37(2003), p.661