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Automatic process control for anaerobic digestion

The aim of research was to develop a simple and cost-efficient control strategy, which besides secure maintenance of a stable process allows to automatically adjust to user-defined operation states. By these means the operation of the process can be simplified. A well-directed adjustment of the operation state allows the optimization of plant operation.

Considering model-based development as an appropriate method for the development of control strategies for the anaerobic digestion process, the Anaerobic Digestion Model No.1 (ADM1 - see Batstone et al. (2002)) was used to simulate the process. The calibrated ADM1 serves to theoretically calculate the behaviour of different control strategies and to adjust the control settings to specific plant conditions. It is intended to estimate the capability under practical conditions by including different disturbances (e.g. measurement errors). To finally practically verify and assess the previous development steps the whole procedure is completed by experimental operations of control strategies. The developed control strategy is based on the utilization of produced amounts of methane as intended final product of the complex anaerobic degradation paths. It is assumed that the methane production under undisturbed process operation also reflects the load level or the operation state of the process. Consequently an operator-defined set-point to a value of methane production to which the system finally should be adjusted, is required. To adjust the amount of input of a fix substrate mixture according to the daily measured methane production proportional-integral controllers (PI controllers) or proportional-integral-differential controllers (PID controllers) with a limited differential part, are used. At the beginning of control actions the controller set-point is set to a value close to the actual methane production. The state of the process hast to be assessed reliably by a reasonable combination of additional and on-line ascertainable process parameters.

Copyright:	© European Compost Network ECN e.V.
Quelle:	Orbit 2012 (Juni 2012)
Seiten:	6
Preis:	€ 6,00
Autor:	Dipl.-Ing. Daniel Löffler Dr.-Ing. Dipl.-Chem. Klaus Fischer o. Prof. Dr.-Ing. Martin Kranert
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