Indirect Monitoring of Anaerobic Digestion for Cheese Whey Treatment
| Autor: | Hilario Flores-Mejia, Hector Puebla, Ricardo Aguilar-López, Eliseo Hernandez-Martinez, Antonio Lara-Musule |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
anaerobic digestion
Observer (quantum physics) Bioengineering 02 engineering and technology indirect monitoring observer design 010501 environmental sciences fractal analysis lcsh:Chemical technology 01 natural sciences lcsh:Chemistry 020401 chemical engineering Chemical Engineering (miscellaneous) lcsh:TP1-1185 Observability State observer 0204 chemical engineering Process engineering 0105 earth and related environmental sciences Mathematics business.industry Process Chemistry and Technology Chemical oxygen demand Experimental data Fractal analysis Anaerobic digestion Wastewater lcsh:QD1-999 business observability index |
| Zdroj: | Processes, Vol 9, Iss 539, p 539 (2021) Processes Volume 9 Issue 3 |
| ISSN: | 2227-9717 |
| Popis: | Efficient monitoring is an open problem in the operation of anaerobic digestion processes, due to the lack of accurate, low-cost, and proper sensors for the on-line monitoring of key process variables. This paper presents two approaches for the indirect monitoring of the anaerobic digestion of cheese whey wastewater. First, the observability property is addressed using conventional and nonconventional techniques, including an observability index. Then, two model-based observer techniques, an extended Luenberger observer, a sliding mode observer, and a data-driven technique based on fractal analysis are formulated and discussed. The performance and capabilities of the proposed methodologies are illustrated on a validated model with experimental data of the anaerobic digestion of cheese whey. Experimental pH measurements are used for the data-driven approach based on fractal analysis. The experimental data sets correspond to experimental conditions (pH > 7.5 and temperature (T) = 40 °C) favoring volatile fatty acid (VFA) production (30 g/L) with simultaneously acceptable biogas production (3420 mL). Results also show that the proposed observers were able to predict satisfactory key process variables. On the other hand, the fractal analysis provides reliable qualitative trends of VFA production and chemical oxygen demand (COD) consumption. |
| Databáze: | OpenAIRE |
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