the same proportion of mixture in a same bioreactor was turned
for 5 min every two days and supplied with no external heating.
2.3. Sampling
Sub-samples from nine sampling points at a depth of 30 cm
were collected every 4 h in the experiment of rapid degradation
of food waste and 2 days in the control one. Sub-samples were
mixed thoroughly to make a composite sample and subsequently
divided into two fractions: the first fraction was dried in an oven
at 105 C for 4 h to determine the moisture content and particle
size (Jolanun and Towprayoon, 2010), the second fraction was
freeze-dried and ground to less than 0.5 mm prior to analysis.