The digestion tests were performed on a single stage fed-batch anaerobic digester with total volume
of200 liters. It was operated at ambient temperature in mesophilic conditions for 28 days (4 weeks). Each
digester was mixed manually for 1 minute once a day before gas volume measurements. Thefirst part of
this research studied addition of vegetable waste loaded by started addition 0.5 kg for the first week and
then increased 0.5 kg per week (0.5, 1, 1.5 and 2 kg). The second batch test increased waste loading 1.0
kg per week (0.5, 1.5, 2.5 and 3.5 kg) with only cattle manure was the starter. The temperature and pH
were monitored daily used thermometer and pH meter. The daily biogas production of each digester was
determined by the volume of biogas produced, that was calculated from the height of collected gas tank
and diameter of the tank. The biogas samples were collected by Tedlar sample bags from digesting tank
and determinate amount of biogas by Geotech Biogas check analyzer. The composition of biogas
(concentration of methane, carbon dioxide, oxygen, hydrogen sulfide and the others) in digester was
monitored weekly. The second part studied mixing of starter between dog manure at 10 wt% and 20 wt%
incattle manure.