On-line estimation of the VFA concentration in anaerobic digestion processes based on a super-twisting observer

Lara-Cisneros, Gerardo; Dochain, Denis

doi:10.1109/codit.2018.8394870

2018 5th International Conference on Control, Decision and Information Technologies (CoDIT) 2018

DOI: 10.1109/codit.2018.8394870

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On-line estimation of the VFA concentration in anaerobic digestion processes based on a super-twisting observer

Gerardo Lara-Cisneros

Denis Dochain

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Cited by 3 publications

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“…Research on the design of estimators across their many classes is highly relevant to the estimate of immeasurable variables in fermenters and biodigesters, and hence informs this study [23][24][25][26][27]. As a result, it strives to do away with the prohibitive monetary expense of installing such machinery in AD facilities.…”

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confidence: 99%

State Estimation in a Biodigester via Nonlinear Logistic Observer: Theoretical and Simulation Approach

et al. 2023

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The state variables in a biodigester are predicted using an unstructured model, and this study offers an analytical design of a Non-Linear Logistic Observer (NLLO), subsequently comparing its performance to that of other prominent state estimators. Because of variables such as temperature, pH, high pressure, volumetric organic load (VOC), and hydraulic retention time (HRT), among others, biodigester samples can be affected by the use of physical sensors, which are not always practical owing to their sensitivity to the type of sampling and external disturbances. The use of virtual sensors represents one approach to solving this issue. In this work, we suggest experimentally validating a mathematical model, then analytically designing a novel NLLO observer, and finally comparing the results to those obtained using a sliding-mode estimator and a Luenberger observer. By including online CH4 and CO2 measurements as inputs to the proposed observer, the local observability analysis demonstrated that all state variables were recoverable. After showing how well the suggested observer performs in numerical experiments, a proof based on the Lyapunov theory is offered. The primary innovation of this study is the incorporation of a novel algorithm that has been empirically validated and has output resilience to input parametric perturbations.

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confidence: 99%

State Estimation in a Biodigester via Nonlinear Logistic Observer: Theoretical and Simulation Approach

et al. 2023

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Method to obtain parameters k ₂ , k ₃ for dilution rate observer in AM2 model of the anaerobic digestion process in a batch reactor

Harker-Sanchez,

Jaramillo,

Arias

2024

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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A novel nonlinear sliding mode observer to estimate biomass for lactic acid production

López‐Pérez

López-López

Núñez-Colín

et al. 2022

Chemical Product and Process Modeling

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This study deals with the problem of estimating the amount of biomass and lactic acid concentration in a lactic acid production process. A continuous stirred tank bioreactor was used for the culture of Lactobacillus helveticus. A nonlinear sliding mode observer is proposed and designed, which gives an estimate of both the biomass and lactic acid concentrations as a function of glucose uptake from the culture medium. Numerical results are given to illustrate the effectiveness of the proposed observer against a standard sliding-mode observer. It was found that the proposed observer worked very well for the benchmark bioreactor model. Also, the numerical results indicated that the proposed estimation methodology was robust to the uncertainties associated with un-modelled dynamics. These new sensing technologies, when coupled to software models, improve performance for smart process control, monitoring, and prediction.

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On-line estimation of the VFA concentration in anaerobic digestion processes based on a super-twisting observer

Cited by 3 publications

References 22 publications

State Estimation in a Biodigester via Nonlinear Logistic Observer: Theoretical and Simulation Approach

State Estimation in a Biodigester via Nonlinear Logistic Observer: Theoretical and Simulation Approach

Method to obtain parameters k ₂ , k ₃ for dilution rate observer in AM2 model of the anaerobic digestion process in a batch reactor

A novel nonlinear sliding mode observer to estimate biomass for lactic acid production

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On-line estimation of the VFA concentration in anaerobic digestion processes based on a super-twisting observer

Cited by 3 publications

References 22 publications

State Estimation in a Biodigester via Nonlinear Logistic Observer: Theoretical and Simulation Approach

State Estimation in a Biodigester via Nonlinear Logistic Observer: Theoretical and Simulation Approach

Method to obtain parameters k 2 , k 3 for dilution rate observer in AM2 model of the anaerobic digestion process in a batch reactor

A novel nonlinear sliding mode observer to estimate biomass for lactic acid production

Contact Info

Product

Resources

About

Method to obtain parameters k ₂ , k ₃ for dilution rate observer in AM2 model of the anaerobic digestion process in a batch reactor