Identification of the potential capacity of an Intermittently Decanted Aerated Lagoon (IDAL) through process optimisation

Identification of the potential capacity of an Intermittently Decanted Aerated Lagoon (IDAL) through process optimisation

An optimization programme was conducted at the Sydney Water Quakers Hill sewage treatment plant to determine the nitrification and denitrification capacity of the intermittently decanted aerated lagoon (IDAL). The effects of changing from aerobic to anoxic selectors and the effects of implementing a...

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Bibliographic Details
Published in:Water science and technology Vol. 39; no. 6; pp. 135 - 142
Main Authors: RAJANAYAGAM, C. D, NGUYEN, T, SINANOVIC, Y, WALKER, J. W
Format: Conference Proceeding Journal Article
Language:English
Published: Oxford Pergamon Press 01-01-1999
IWA Publishing
Subjects:
Aerated lagoons
Aeration
Anoxia
Applied sciences
Biological and medical sciences
Biological treatment of waters
Biotechnology
Capacity
Control
Decantation
Denitrification
Environment and pollution
Exact sciences and technology
Excess capacity
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
Nitrification
Optimization
Other wastewaters
Pollution
Process control
Process controls
Selectors
Sewage
Sewage treatment
Sewage treatment plants
Wastewater treatment
Wastewater treatment plants
Wastewaters
Water treatment and pollution
Intermittent running
Aerated lagoon
Nitrification
Denitrification
Urban waste water
Waste water purification
Decantation
Optimization
Biological purification
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Summary:An optimization programme was conducted at the Sydney Water Quakers Hill sewage treatment plant to determine the nitrification and denitrification capacity of the intermittently decanted aerated lagoon (IDAL). The effects of changing from aerobic to anoxic selectors and the effects of implementing aeration control were examined. Changing from aerobic to anoxic selectors had no significant effect on the sludge volume index in the IDAL. Use of anoxic selectors improved denitrification. The activity of heterotrophs significantly increased with reduced sludge age, while the activity of autotrophs increased only marginally. Ammonia uptake rate and nitrate uptake rate could be used as process control parameters to determine the biomass required to achieve the desired effluent quality. The IDAL could be operated with a sludge age as low as 13 d. The denitrification performance of the IDAL could be improved by increasing the contact time between the biomass and the bulk liquid during settling and decant cycles.
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ISBN:0080436463
9780080436463
ISSN:0273-1223
1996-9732
DOI:10.1016/S0273-1223(99)00132-8