Estimation of Hydrolysis Parameters in Full-Scale Anaerobic Digesters

Batstone, D. J., Tait, S. and Starrenberg, D. (2009) Estimation of Hydrolysis Parameters in Full-Scale Anaerobic Digesters. Biotechnology & Bioengineering, 102 5: 1513-1520. doi:10.1002/bit.22163

Author Batstone, D. J.
Tait, S.
Starrenberg, D.
Title Estimation of Hydrolysis Parameters in Full-Scale Anaerobic Digesters
Journal name Biotechnology & Bioengineering   Check publisher's open access policy
ISSN 0006-3592
Publication date 2009-04-01
Year available 2008
Sub-type Article (original research)
DOI 10.1002/bit.22163
Open Access Status Not yet assessed
Volume 102
Issue 5
Start page 1513
End page 1520
Total pages 8
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Subject C1
090409 Wastewater Treatment Processes
960912 Urban and Industrial Water Management
Abstract In hydrolysis-limited anerobic systems, the key parameters describing degradation are degradability extent ( fd), and the lumped apparent first order coefficient (khyd). These are often measured in biological methane potential (BMP) tests. Using modern techniques, it should also be possible to estimate these parameters in full-scale systems, especially where inputs are dynamic. In this study, we evaluated fd and khyd values and uncertainty based on nonlinear parameter estimation from (i) BMP tests and (ii) effluent gas and solids from two full-scale digesters fed with highly variable feed flows and concentrations (up to 6 kgCODm3 day1). The substrate was thermally hydrolyzed activated sludge, and the inoculum for BMP tests was from the full-scale digesters. While identifiability of both parameters in the BMP tests was generally good, only fd could be well identified using continuous data. For khyd using continuous data, normally only a lower limit could be found (upper was unbounded). In addition, parameters as estimated on different outputs (VS and gasflow) and two different digesters were consistent, with an fd value of 0.45– 0.55, and a khyd value of >5 day1. Gradual changes in fd over the 450 days could be related to upstream changes. fd values as estimated in BMP tests were consistent (if conservative)with continuous estimates, with a fd in BMP of 0.4–0.5. khyd values were an order of magnitude lower (0.15– 0.25 day1 vs. >5 day1), and this translated to very poor model performance when BMP-estimated values were used in the continuous model. This means that while BMP testing may be used for project feasibility analysis, values obtained should not be used for dynamic modeling. The parameter confidence regions found were highly nonlinear, especially for continuous systems, indicating that iterative or sampling techniques are required for an estimate of real parameter uncertainty.
Keyword hydrolysis
activated sludge
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Advanced Water Management Centre Publications
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Citation counts: TR Web of Science Citation Count  Cited 114 times in Thomson Reuters Web of Science Article | Citations
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Created: Sat, 28 Mar 2009, 21:44:50 EST by Suzanne Read on behalf of Advanced Water Management Centre