methane and 30%-50% carbon dioxide, depending on
the substrate as well as small amounts of other gases
including hydrogen sulphide. Methane is the
component chiefly responsible for a typical caloric
2.3.1 Technology of Biogas Producing
1) Open Pond without Oxygen (Anaerobic covered lagoon)
Waste water in pond will be digested in natural. Pond shall deep at least 1 meter and cover with plastic on the top (PVC,HDPE) for keeping Biogas inside, On bottom part and wall shall be smooth surface to protect mixing system with deep water in underground. In bottom area of pound there is settle of organic that was digested is organic acid and biogas.
- Advantage : Is easy to construction, fast and low cost investment that is stable for waste water in high concentrate of solid and high efficiency.
- Disadvantage : Is Process need big construction of pond area, opportunity of mixing is not good, difficult to elimination of Solid settle in the pond. If the process is failed, it is difficult and long time to correct in normal also how problem well tearing of plastic.