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Handbook of Biofuels Production, 2nd Edition by James Clark, Karen Wilson, Carol Ki Lin, Rafael Luque

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10.7. Process monitoring and control

Process monitoring and control is very crucial to evaluate the biogas process, to identify upcoming instabilities in AD before a failure, to have a successful start-up or re-start of a plant, and to secure or even improve the digestion performance. In order to develop a control scheme the following steps should be considered:
• Definition of the control objective: The objective could be as simple as the pH stabilization or more complicated involving stabilization and optimization of the bioreactor operation in terms of biogas production or chemical oxygen demand removal. Since optimization and stabilization are conflicting objectives, the control law should be sophisticated enough to meet these targets in the ...

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