On-line automatic control system for monitoring an anaerobic fluidized-bed reactor: response to organic overload

Moletta, R.; Escoffier, Y.; Ehlinger, F.; Coudert, Jean-Pierre; Leyris, J.P.

doi:10.2166/wst.1994.0572

Cited by 40 publications

(16 citation statements)

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“…The system used only one process variable, methane production rate, to manipulate the dilution rate. Ehlinger et al (1994) and Moletta et al (1994) developed automatic systems based on the expert system principle to control laboratory-and pilotscale fluidized-bed reactors. The control algorithms used the information of pH, gas production rate, and its hydrogen content to calculate the variation in feed rate.…”

Section: Introductionmentioning

confidence: 99%

Monitoring and control of an anaerobic upflow fixed‐bed reactor for high‐loading‐rate operation and rejection of disturbances

Liu

Olsson

Mattìasson

2004

Biotech & Bioengineering

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A new control strategy has been introduced for operating anaerobic digestion processes efficiently at high load. The control system includes a cascade controller embedded into a rule-based supervisory system based on extremum-seeking control. Three process parameters, considered to be the most realistic variables for monitoring of the bioprocess, were selected (pH, biogas production rate, and the difference between the actual biogas flow and its setpoint). The control system examines these variables and varies the organic load by manipulating the influent flow. Good control performance was achieved during the start-up, during steady-state running operations, and during rejection of disturbances. The main advantages of this control approach can be attributed to its ability to adjust control parameters automatically, both for high-load operation and for rejection of disturbances. Furthermore, the influent flow can be tuned automatically according to variations in organic matter in the feed without the characteristics of the influent being considered.

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Section: Introductionmentioning

confidence: 99%

Monitoring and control of an anaerobic upflow fixed‐bed reactor for high‐loading‐rate operation and rejection of disturbances

Liu

Olsson

Mattìasson

2004

Biotech & Bioengineering

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“…fine sand (0.1-0.3 mm), basalt, pumice, or plastic. The FB system can be regarded as an advanced anaerobic technology (Heijnen et al 1990;Li and Sutton 1981), which may reach loading rates exceeding 40 kg COD m -3 day -1 , when operated under defined conditions (Moletta et al 1994). Good mass transfer resulting from (1) liquid turbulence and high flow rate around the particles, (2) less clogging and less shortcircuiting due to the occurrence of large pores through bed expansion, and (3) high specific surface area of the carriers due to their small size, make FB reactors highly efficient.…”

Section: Fluidized and Expanded Bed Systems (Fb Egsb Ic Reactors)mentioning

confidence: 99%

Celebrating 40 years anaerobic sludge bed reactors for industrial wastewater treatment

Lier

Zee

Frijters

et al. 2015

Rev Environ Sci Biotechnol

243

100

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In the last 40 years, anaerobic sludge bed reactor technology evolved from localized lab-scale trials to worldwide successful implementations at a variety of industries. High-rate sludge bed reactors are characterized by a very small foot print and high applicable volumetric loading rates. Best performances are obtained when the sludge bed consists of highly active and well settleable granular sludge. Sludge granulation provides a rich microbial diversity, high biomass concentration, high solids retention time, good settling characteristics, reduction in both the operation costs and reactor volume, and high tolerance to inhibitors and temperature changes. However, sludge granulation cannot be guaranteed on every type of industrial wastewater. Especially in the last two decades, various types of high-rate anaerobic reactor configurations have been developed that are less dependent on the presence of granular sludge, and many of them are currently successfully applied for the treatment of various kinds of industrial wastewaters worldwide. This study discusses the evolution of anaerobic sludge bed technology for the treatment of industrial wastewaters in the last four decades, focusing on granular sludge bed systems.

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“…For instance, anaerobic digesters require fast measurements of methane, carbon dioxide and volatile fatty acids, among other compounds [8,9]. In this regard, electronic noses permit bioreactor control using real-time sampling methods with low instrumental cost.…”

Section: Introductionmentioning

confidence: 99%

Customized design of electronic noses placed on top of air-lift bioreactors for in situ monitoring the off-gas patterns

Rosi

Miscoria

Bernik

et al. 2012

Bioprocess Biosyst Eng

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A specially designed electronic nose was coupled to an air-lift bioreactor in order to perform on-line monitoring of released vapors. The sensor array was placed at the top of the bioreactor sensing the headspace in equilibrium with the evolving liquor at any time without the need of aspiration and pumping of gases into a separated sensor chamber. The device was applied to follow the off-gas of a bioreactor with Acidithiobacillus thiooxidans grown on beds of elemental sulfur under aerobic conditions. Evolution was monitored by acid titration, pH and optical density measurements. The electronic nose was capable to differentiate each day of reactor evolution since inoculation within periods marked off culture medium replacements using multivariate data analysis. Excellent discrimination was obtained indicating the potentiality for on-line monitoring in non-perturbed bioreactors. The prospects for electronic nose/bioreactor merging are valuable for whatever the bacterial strain or consortium used in terms of scent markers to monitor biochemical processes.

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On-line automatic control system for monitoring an anaerobic fluidized-bed reactor: response to organic overload

Cited by 40 publications

References 0 publications

Monitoring and control of an anaerobic upflow fixed‐bed reactor for high‐loading‐rate operation and rejection of disturbances

Monitoring and control of an anaerobic upflow fixed‐bed reactor for high‐loading‐rate operation and rejection of disturbances

Celebrating 40 years anaerobic sludge bed reactors for industrial wastewater treatment

Customized design of electronic noses placed on top of air-lift bioreactors for in situ monitoring the off-gas patterns

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