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Home List of Titles A comparison of biological nutrient removal in intermittent cyclic and continuous activated sludge systems
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/232302
- A comparison of biological nutrient removal in intermittent cyclic and continuous activated sludge systems
- Ho, K. M.; Greenfield, P. F.; Blackall, L. L.; Bell, P. R. F.; Krol, A.
- An assessment was made of biological phosphorus and nitrogen removal and related sludge bulking control in both intermittent cyclic and continuous activated sludge systems. Experimental results from a laboratory-scale investigation using fermented domestic sewage indicated the advantages of achieving high levels of P and N removal and good sludge-settling properties using the intermittent cyclic process, as compared to the continuous process. The modified intermittently fed and decanted system incorporating non-mixing sequences produced an effluent quality of NO3-N < 5 mg L^-1, PO4-P < 1 mg L^-1 and NH3-N < 2 mg L^-1, with a non-bulking sludge having a sludge volume index < 120 mL g^-1, despite unfavourable influent characteristics (TCOD : TKN < 7, TKN > 60 mg L^-1, TP-9 mg L^-1 and RBCOD < 30 mg L^-1). In contrast, the modified 4-stage Bardenpho process could not achieve effluent NO3-N and PO4-P concentrations of < 10 and < 1 mg L^-1, respectively. The sludge volume index (SVI) values were always higher than 250 mL g^-1 and occasionally reached as high as 422 mL g^-1. The causative filaments were low F:M growers - Types 0041/0675.
- Publication type
- Journal article
- Resources, Conservation and Recycling: incorporating Proceedings of the International Conference on Environmental Biotechnology in Waste Treatment and Recycling, Hong Kong, Hong Kong, 12-14 January 1993, Vol. 11, no. 1-4 (Jun 1994), pp. 149-159
- Publication year
- FOR Code(s)
- 05 Environmental Sciences; 09 Engineering; 12 Built Environment and Design
- Activated sludge; Biological nutrient removal; BNR; Chemical oxygen demand; Continuous activated sludge system; Denitrification; Nutrient; Phosphorus; Sewage treatment; SVI; Waste water management
- Publisher URL
- Copyright © 1994 Published by Elsevier BV.
- Peer reviewed