2.4. Effect of initial pH on digestion
In order to determine the effect of initial pH on biogas generation
rate, the digesters containing the feedstock (RH) were buffered
with buffer solutions: citrate buffer of pH 4, phosphate buffer of pH
7 and boric acid e borax buffer of pH 10. Digestion was initiated in
each case by addition of 50 mL cow rumen inoculum.