High-rate processes

ADI Process. The ADI is a low rate anaerobic process which is operated ia a reactor resembling a covered football field. Because of the low rate, it is less susceptible to upset compared to the high rate processes. Its disadvantage is the large land area requirement. 

Table 4 High Rate Processes from Various Vendors...

Methane yield decreased to 2.4 SCF/lb VS added (43.8% of theoretical yield) when the loading rate was increased to 0.18 lb VS/ft -day and the detention time decreased to 9 days (Table I). These data indicate that conventional digestion process efficiency would decrease substantially as the loading rate is increased and the detention time is decreased beyond the baseline values of these parameters. Unconventional or advanced digestion methods are thus needed to overcome the limitations of the conventional high-rate process. 

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