Avoiding digester imbalance through real-time expert system control of dilution rate

Pullammanappallil, Pratap; Harmon, Jeffrey L.; Chynoweth, D.P.; Lyberatos, Gérasimos; Svoronos, Spyros A.

doi:10.1007/bf02922587

Cited by 12 publications

(5 citation statements)

References 6 publications

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“…The CH 4 and CO 2 percentage can be measured using gas chromatographic methods or infrared measurements. The use of methane production as a process output for control is commonly employed (Renard et al, 1988(Renard et al, , 1991Ryhiner et al, 1992;Boscolo et al, 1993;Polihronakis, Petrou, and Deligiannis, 1993;Ryhiner, Heinzle, and Dunn, 1993;Chynoweth et al, 1994;Ehlinger et al, 1994;Moletta et al, 1994;Pullammanappallil et al, 1991Pullammanappallil et al, , 1992Pullammanappallil et al, , 1998. Pressure sensing is a reliable and straightforward technique for the on-line quantification of gas consumption or production in bioprocesses when only a single gas is involved (Anderlei et al, 2004).…”

Section: On-line Monitoring and Controlmentioning

confidence: 99%

Critical analysis of engineering aspects of shaken flask bioreactors

Suresh

Srivastava

Mishra

2009

Critical Reviews in Biotechnology

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Shaking bioreactors are the most frequently used reaction vessels in biotechnology. Since their inception, shaking bioreactors have been playing a significant role in medicine, agriculture, food, environmental, and industrial research. In spite of their huge practical importance, very little is known about the characteristic properties of shaken cultures from an engineering point of view. In this paper, a critical analysis is presented of the mixing characteristics, aeration, mass and heat transfer, power consumption, and suitability for on-line monitoring and control of various environmental and other operating parameters in aerated and anaerobic/anoxic conditions. Aspects of cell damage due to shear stress generated in shaken flask and loss of sterility due to contamination are also discussed.

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Section: On-line Monitoring and Controlmentioning

confidence: 99%

Critical analysis of engineering aspects of shaken flask bioreactors

Suresh

Srivastava

Mishra

2009

Critical Reviews in Biotechnology

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“…Toxins in feed can inhibit microbial populations and lower biogas and methane production rate. On-line process control and optimization techniques to reject disturbances, usually monitor methane production rate (or methane composition) as a measured variable (Pullammanappallil, 1991(Pullammanappallil, ,1998Chynoweth, 1994;Polag, 2015;Lara-Cisneros, 2015). Therefore, it is essential to monitor in real-time, on-line digester methane concentration and BFR.…”

Section: Introductionmentioning

confidence: 99%

Inexpensive, Arduino-Based Device for on-Line, Automatic, Real-Time Measurement of Methane Composition and Biogas Flowrate From Anaerobic Digesters

Yang

Svoronos

Pullammanappallil

2020

Preprint

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Anaerobic digestion is widely used for waste treatment and for biofuel production in the form of biogas from dedicated energy crops. Proper operation and control of anaerobic digesters require knowledge of biogas flow rate and methane composition of biogas. Methane content of biogas from an anaerobic digester was measured on-line by modifying an off-line measurement device, previously constructed by the authors, that uses a hydrocarbon sensor (MQ-4) and a pressure/temperature/humidity sensor (BME-280) integrated with an Arduino Uno. This modified on-line sensor was programmed to automatically measure methane composition by self-regulated introducing biogas sample and evacuating the device. It also equipped with a function of biogas flow chamber which could calculate the cumulative biogas production over a time interval. Methane composition (v/v) could be measured every three hours. Measurements made by this device agreed within an average absolute difference of 0.81 ± 0.58 % with measurements by a gas chromatograph equipped with a thermal conductivity detector. The volumetric flow rate was directly expressed on a moisture-free basis at standard temperature and pressure. The total cost of this device was under US $140. For an additional US $7, the device can be upgraded with an LED display that toggles between composition and flow rate.

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“…With this objective numerous authors5–9 have proposed control algorithms to secure digesters stability both during start‐up and steady‐state. Renard et al 5.…”

Section: Introductionmentioning

confidence: 99%

Advanced dynamical risk analysis for monitoring anaerobic digestion process

Hess

Bernard

2009

Biotechnology Progress

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Methanogenic fermentation involves a natural ecosystem that can be used for waste water treatment. This anaerobic process can have two locally stable steady-states and an unstable one making the process hard to handle. The aim of this work is to propose analytical criteria to detect hazardous working modes, namely situations where the system evolves towards the acidification of the plant. We first introduce a commonly used simplified model and recall its main properties. To assess the evolution of the system we study the phase plane and split it into nineteen zones according to some qualitative traits. Then a methodology is introduced to monitor in real-time the trajectory of the system across these zones and determine its position in the plane. It leads to a dynamical risk index based on the analysis of the transitions from one zone to another, and generates a classification of the zones according to their dangerousness. Finally the proposed strategy is applied to a virtual process based on model ADM1. It is worth noting that the proposed approach do not rely on the value of the parameters and is thus very robust.

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Avoiding digester imbalance through real-time expert system control of dilution rate

Cited by 12 publications

References 6 publications

Critical analysis of engineering aspects of shaken flask bioreactors

Critical analysis of engineering aspects of shaken flask bioreactors

Inexpensive, Arduino-Based Device for on-Line, Automatic, Real-Time Measurement of Methane Composition and Biogas Flowrate From Anaerobic Digesters

Advanced dynamical risk analysis for monitoring anaerobic digestion process

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