Use of an anaerobic sequencing batch reactor for parameter estimation in modeling of anaerobic digestion

Batstone, D. J., Torrijos, M. J., Ruiz, C. and Schmidt, J. E. (2004). Use of an anaerobic sequencing batch reactor for parameter estimation in modeling of anaerobic digestion. In: Water Science and Technology: Sequencing Batch Reactor Technology III (Selected Proceedings of the IWA International Specialised Conference on Sequencing Batch Reactor Technology. IWA International Specialised Conference on Sequencing Batch Reactor Technology, Noosa, Queensland, Australia, (295-303). 22-26 February, 2004.


Author Batstone, D. J.
Torrijos, M. J.
Ruiz, C.
Schmidt, J. E.
Title of paper Use of an anaerobic sequencing batch reactor for parameter estimation in modeling of anaerobic digestion
Conference name IWA International Specialised Conference on Sequencing Batch Reactor Technology
Conference location Noosa, Queensland, Australia
Conference dates 22-26 February, 2004
Convener International Water Association
Proceedings title Water Science and Technology: Sequencing Batch Reactor Technology III (Selected Proceedings of the IWA International Specialised Conference on Sequencing Batch Reactor Technology   Check publisher's open access policy
Journal name Water Science and Technology   Check publisher's open access policy
Place of Publication London
Publisher IWA Publishing/Portland Press
Publication Year 2004
Sub-type Fully published paper
ISSN 0273-1223
Volume 50
Issue 10
Start page 295
End page 303
Total pages 9
Language eng
Abstract/Summary The model structure in anaerobic digestion has been clarified following publication of the IWA Anaerobic Digestion Model No. 1 (ADM 1). However, parameter values are not well known, and uncertainty and variability in the parameter values given is almost unknown. Additionally, platforms for identification of parameters, namely continuous-flow laboratory digesters, and batch tests suffer from disadvantages such as long run times, and difficulty in defining initial conditions, respectively. Anaerobic sequencing batch reactors (ASBRs) are sequenced into fill-react-settle-decant phases, and offer promising possibilities for estimation of parameters, as they are by nature, dynamic in behaviour, and allow repeatable behaviour to establish initial conditions, and evaluate parameters. In this study, we estimated parameters describing winery wastewater (most COD as ethanol) degradation using data from sequencing operation, and validated these parameters using unsequenced pulses of ethanol and acetate. The model used was the ADM 1, with an extension for ethanol degradation. Parameter confidence spaces were found by non-linear, correlated analysis of the two main Monod parameters; maximum uptake rate (k(m)), and half saturation concentration (K-s). These parameters could be estimated together using only the measured acetate concentration (20 points per cycle), From interpolating the single cycle acetate data to multiple cycles, we estimate that a practical "optimal" identifiability could be achieved after two cycles for the acetate parameters, and three cycles for the ethanol parameters. The parameters found performed well in the short term, and represent led the pulses of acetate and ethanol (within 4 days of the winery-fed cycles) very well. The main discrepancy was poor prediction of pH dynamics, which could be due to an unidentified buffer with an overall influence the same as a weak base (possibly CaCO3). Based on this work, ASBR systems are effective for parameter estimation, especially for comparative wastewater characterisation. The main disadvantages are heavy computational requirement's for multiple cycles, and difficulty in establishing the correct biomass concentration in the reactor, though the last is also a disadvantage for continuous fixed film reactors, and especially, batch tests.
Subjects 090702 Environmental Engineering Modelling
Keyword Engineering, Environmental
Environmental Sciences
Water Resources
ADM1
ASBR
estimation
ethanol
model
parameter
PE
winery
Q-Index Code E1
Additional Notes Sequencing Batch Reactor Technology III (Selected Proceedings of the IWA International Specialised Conference on Sequencing Batch Reactor Technology, held in Noosa, Queensland, Australia, 22-26 February 2004)

 
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Created: Wed, 17 Oct 2007, 13:19:38 EST