Table 2.
Two types of most common biogas reactors in Iran [5].
Title Chinese model Indian model
Type of production Manure–gas Gas–manure
Building Building is integrated and creating it is possible in every where Materials and buildings method is simple
Inlet material Generally mixture of plants waste, animal waste, human waste Generally cow׳s manure
Material outlet method In many case, the pump or bucket Material after digestion will floating and will exit from bucket
Average size (m3) 18 14
Collecting the gas Dose not need cover and amount of gas will determined by gas pressure and exit material from outlet bucket In floating caps, height of gas tank show the amount of gas
Gas pressure Pressure is high (max: 1000 mmHg) Pressure is low (70–150 mmHg)
Cost Low cost High cost due to use of metal components