2. Materials and Methodss
2.1. Feedstock and inoculum
The materials used in this study included: grapes, maize and millet,
which were collected from the shop in Xiamen city Fujian Province. The
straw and grass was collected from village of Xiamen. Dried straws were
chopped using a grinder (Hummer 900) to an approximate size of 2-3 mm.
Inoculum was obtained from a laboratory-scale working pig manure
digester that treated pig wastewater form the same pig farm.