50
Inventory of Innovative Indoor Smoke
Alleviating Technologies in Nepal
Table 6.1: Government subsidy rate for biogas user (for 2006/07)
Source: BSP 2007
Region
20 Terai districts
40 Hill districts
15 Remote hill districts
4 and 6 m3
NRs. 6,500
NRs. 9,500
NRs. 12,500
8 and 10 m3
NRs. 6,000
NRs. 9,000
NRs. 12,000
Specified low penetrated districts (in Terai and Mid-hills, altogether 18) will be provided with additional subsidy
of NRs. 500 per plant
production is about 30-40oC and the production virtually
ceases below 10oC. A research is undertaken to develop
appropriate biogas plant designs for altitude higher
than 2,100m. Two plants were installed during the 3rd
Phase in Khumjung and Lukla of Solukhumbu district
with greenhouse technology. However, despite the merit
of the design and technology, the project cost was
very high. Four years ago, three other simpler new
designs were tested in Beni VDC of Solu district with
much lower project cost. One of the three designs, a
simple addition of heap composting on top of the
digester is found to be the most appropriate and cost
effective design. This design is thus widely promoted
between 2,100 to 3,000m altitude as part of the regular
national programme with subsidy. The GGC-2047 design
with heap composting technology was approved for
commercial dissemination last year. Till date, some 40
biogas plants with heap composting are constructed
in upper part of Rasuwa district and more are under
construction. Some 30 plants with such heap composting
are installed in Solukhumbu district. The results are
satisfactory. BSP-Nepal is going to undertake more
promotional work in remote districts of Karnali and
other areas like Manang and Mustang for construction
of biogas plants with heap composting technique.
Further research was initiated in 2007 in Rasuwa district
(Langtang area) between 3,000 to 3,850m using
modified GGC-2047 (improved design with provision of
multiple feeding, heap composting and warm water
feeding).
Likewise, an initiative is taken to establish the biogas
plant that works on batch feeding mode. Feeding material
is loaded once or twice a year to produce gas throughout
the year. This kind of biogas plant introduced in Nepal is
called Puxin model biogas plant which is a kind of
hydraulic pressure biogas plant. More than 50 such plants
are installed in different districts and most of these plants
are working satisfactorily. The schematic diagram of Puxin
model biogas plant is shown in Figure 6.2.
Figure 6.2: Schematic diagram of Puxin model biogas plant