Biogas toxic products

As was pointed out in previous sections, the main control objective in AD processes is related to guarantee the stable operation of the process, which is also called operational stability [14]. The variables frequently used to monitoring the digester-stability are the biogas production rate and the COD, VFA and alkalinity effluent concentrations. Particularly, VFA are one of the most important intermediaries in the AD process, because their accumulation (generally induced by organic and toxic overloads) may lead to process failure due to the pH-drop they induce and their inhibitory effects in acid form [14, 27]. Thus, the importance of design efficient control systems capable to... 

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