Bio-gas Plant in Trongsa: An approach to cheap, green and Renewable Energy solution

Untitled-1The Livestock sector of Trongsa Dzongkhag coordinated and initiated the establishment of Bio-gas plants in Drakten and Langthil geogs, the first of its kind in the Dzongkhag. It involved both the beneficiaries and sector employees as part of a capacity building programme which served as a platform for the sector staff to learn the fundamentals of biogas plant construction and operation through practical engagement. Two teams were formed, one for each geog comprising proportionate mixture of skills and man force. The programme was carried out under the sector budget funded by the Mangdechhu Hydroelectric Project Authority (MHPA).

The programme was carried out with the purpose of attaining the following:

  • Provide the households with alternate choice of energy through supply of cheap, clean and green energy for their daily use.
  • To offset rising cost incurred from use of electricity, firewood and LPG .
  • Develop the capacity of the field extension agents and the farmers alike for future initiatives and endeavour.

Untitled-2Three full time masons who were trained by the livestock sector were also involved in the programme. A total of five households belonging to the Dairy Development Groups were selected for the scheme where materials were supplied free of cost while the households contributed labour. Fixed dome type plants based on the modified GGC model of Nepal with a capacity of 4bio digesters have been installed. 20-40 kgs of dung and equal amount of water is required for such type of plants to produce 0.8 to 1.6 of gas daily. The Tendrel ceremony for the programme was graced by the Gup of respective geogs.

Untitled-4The works began in sequential order with the construction of the digester. Diameter was fixed and collar laid inside the pit prior to the construction of walls and manhole. Inlet pipes were then installed and the empty spaces outside the digester walls backfilled to create a dome. The backfilled soils inside the dome were then excavated and tunneled. A beam or top manhole was then raised and a gas holder prepared through moulding, concreting and fixing of dome gas pipes. Then the inlet and outlet chambers were built followed by plastering the inside of the dome at three different phases. Finally a turret was formed and fitted with pipelines and appliances. The wet cemented structures were allowed for curing at completion of each activity.

The Dzongkhag now boasts of five Biogas plants. With the completion of the plants, it is expected that the pioneers of this technology in the geog would serve as an exemplar for others to adopt and gradually translate these package of practices into an exclusive venture defining household name in the posterity. It will not be long before we see many such plants in the Dzongkhag. The plants can extend its benefits beyond just lighting the stoves- it can fertilise the land through the digestate and enrich the crops. The substrates in the digesta acts as an agent which suppresses the odour emanating from the slurry. It also helps prevent methane emission.

The whole process of biogas plant construction culminated into a venture of lessons learnt and knowledge earned. It was a wholesome experience for the team to try hands at every bit and pieces of the many aspects and details that we were unaware of. The works were executed under the technical supervision of two trained technical staffs and three masons.

The following individuals comprised the team;

NameDesignationRemarks
Kinley RabgayAsst. DLOAdministration
Jigme ChophelLivestock Production OfficerProgram Coordinator
Sonam WangchukSr. ES III
Karchung DrukpaLHSProgram Coordinator
Sonam TsheringES IIProgram Coordinator
Yeshi DorjiES II

Dzongkhag Livestock Sector, Trongsa

 

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