An adaptive observer for operation monitoring of anaerobic digestion wastewater treatment

Rodríguez, Antonio; Quiroz, G.; Femat, R.; Méndez‐Acosta, Hugo Oscar; León, J. De

doi:10.1016/j.cej.2015.01.038

Cited by 28 publications

(14 citation statements)

References 15 publications

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“…The sum of BEPS and SMP is termed as the total EPS (TEPS). The concentration of BEPS was determined by a heat extraction method [26] with the following procedure: (1) 30-mL sludge mixture was put 14 equally into three 15-mL tubes, respectively, one of the tubes was centrifugated at 6000 rpm for 15 min with a subsequent filtration through 0.45 μm microfiber filter paper, and then the supernatant was analyzed for SMP; (2) the pellet in the tube was re-suspended into distilled water and washed for three times, then the sludge was diluted with distilled water to its original volume, and then heated to 80 0 C in a water bath for 30 min; (3) the supernatant collected after a centrifugation was regarded as EPS extraction, and the proteins were measured according to the Bradford method [27] with Bovine Serum Albumin (BSA) as standard, and the polysaccharides were determined by the phenol-sulphuric acid method [28] with glucose as standard.…”

Section: Methodsmentioning

confidence: 99%

“…Multi-wavelength fluorometry was once examined for the on-line monitoring of an AD process [12], and the near infrared spectroscopy in online-monitoring of feeding substrate quality in an AD was also used for the same purpose [13]. Besides, other on-line estimation approaches were verified to be reliable in providing information towards the rapid on-line monitoring of AD processes [14], which could be used as a stand-alone and promising sensor device. However, as for the purpose of on-line monitoring and controlling, the researches performed to date have mainly focused on a single physical and chemical property as an indicator, rather than on a comprehensive index.…”

Section: Introductionmentioning

confidence: 99%

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Rheological behavior of the sludge in a long-running anaerobic digestor: Essential factors to optimize the operation

Feng

Tang

Liu

et al. 2016

Biochemical Engineering Journal

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rheological behavior of the sludge in a long-running anaerobic digestor: Essential factors to optimize the operation

Feng

Tang

Liu

et al. 2016

Biochemical Engineering Journal

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“…Some interesting works have been studied and published in ref. [27], which presents a type of adaptive observer. This adaptive observer has been used for robust estimation in a particular type of nonlinear systems.…”

Section: Overviewmentioning

confidence: 99%

A turbidity sensor development based on NL-PI observers: Experimental application to the control of a Sinaloa’s River Spirulina maxima cultivation

et al. 2020

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This article addresses the problem of controlling the growth of microalgae originating in Mexican rivers, especially in the state of Sinaloa, Culiacan River. For this purpose, a robust, high-gain nonlinear observer is proposed to estimate the unknown disturbance in the cultivation of mixotrophic microalgae with the presence of organic nutrients. Once a perturbation function related to the change of ambient light is estimated, an output feedback control for the photobioreactor is proposed, in which through Lyapunov’s convergence functions, the final boundary stability conditions are obtained. Thus, a turbidity sensor was designed for Spirulina platensis, a native microalgae of Culiacan River, which is presented using the MATLAB-Arduino programming environment. This sensor is calibrated using biomass culture and is a low-cost device. Through the numerical study, the feasibility and performance of the control and the observer are evaluated. Finally, real-time experimental evaluations are made based on the literature, studying the use of robust controllers in a photobioreactor with a mixed culture, in the presence of environmental changes in lighting.

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“…However, the dilution rate controls the convergence rate when utilizing asymptotic observes. Simultaneous estimating of model parameters and the state of the process can be performed with adaptive observers . Alternatively, using the process model and its known parameters allows the tailoring of nonlinear observers with the nonlinearity of the process accounted for by the algorithm .…”

Section: Emerging Spr Sensor Technologies For Admentioning

confidence: 99%

Perspectives of surface plasmon resonance sensors for optimized biogas methanation

Lamb¹,

Bernard

Sarker³

et al. 2019

Engineering in Life Sciences

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Biogas production is becoming significantly viable as an energy source for replacing fossil‐based fuels. The further development of the biogas production process could lead to significant improvements in its potential. Wastewater treatment currently accounts for 3% of the electrical energy load in developed countries, while it could be developed to provide a source of nitrogen and phosphorus, in addition to energy. The improvement of anaerobic digestion (AD) detection technologies is the cornerstone to reach higher methane productivities and develop fully automatized processes to decrease operational costs. New sensors are requested to automatically obtain a better interpretation of the complex and dynamical internal reactor environment. This will require detailed systematic detection in order to realize a near‐optimal production process. In this review, optical fiber‐based sensors will be discussed to assess their potential for use in AD. There is currently a disparity between the complexity of AD, and online detection. By improving the durability, sensitivity, and cost of dissolved H2 (as well as H2S, acetic acid, ammonia, and methane) sensor technology, further understanding of the AD process may allow the prevention of process failure. The emergence of surface plasmon resonance (SPR) sensing with optical fibers coupled with the H2‐sensitive metal palladium, allows detection of dissolved hydrogen in liquid. By implementing these SPR sensors into AD, improvements to the biogas production process, even at small scales, may be achieved by guiding the process in the optimum direction, avoiding the collapse of the biological process. This review intends to assess the feasibility of online, cost‐effective, rapid, and efficient detection of dissolved H2, as well as briefly assessing H2S, acetic acid, ammonia, and methane in AD by SPR.

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An adaptive observer for operation monitoring of anaerobic digestion wastewater treatment

Cited by 28 publications

References 15 publications

Rheological behavior of the sludge in a long-running anaerobic digestor: Essential factors to optimize the operation

Rheological behavior of the sludge in a long-running anaerobic digestor: Essential factors to optimize the operation

A turbidity sensor development based on NL-PI observers: Experimental application to the control of a Sinaloa’s River Spirulina maxima cultivation

Perspectives of surface plasmon resonance sensors for optimized biogas methanation

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