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Table~46(a);
Quantify Of Kerosene Used Before And After Installation Of Bwgas Plants
Qty of fire-wood used
No. of Household
(In Bharis */year) Before After
0 to 10 23 32
11 to 30
31 to 50
26
27
42
17
More than 50 24 9
Table-46(b):
Saving Of Kerosene After Installation Of Biogas Plants
Qty of Kerosene Saved
(In Litres/year),
No- of Household
1 to 50 49
51 to 75
76 to 150
3
1
More than 150 0
Remained same 43
Additional required 4
Conclusively, installation of biogas has helped in saving of firewood and kerosene. However, the users were not
well aware on these savings in monetary' values.
ii.
Impacts of Slurry
It is well recognized that the economic benefits of biogas technology are greatly increased if the slurry biproduct
is used effectively by farmers. During field visits to individual households, the study team observed that
in most of the cases (93%), the slurry overflow from biogas digester was led directly into compost pit(s).
Among the total sampled 100 plants, 57 have constructed single slurry pit and 34 have double pits. It is
encouraging to see three slurry pits in 2 households in one hand and in the other, absence of slurry pit in 7
households is really a matter of concern. It was also observed that 72 plant owners have added other organic
materials in the slurry pit for composting. When asked what organic material they add in slurry pit, 62% of the
respondents told that they add remains of grass or fodder and the remaining 10% told that they add other
household waste. Most of the respondents (89%) replied that the quantity of available manure decreases
significantly affecting manure-supply on the fields. During the inspection of biogas plants, it was found that
slurry was not flowing out from outlet in 43 cases.
Most of the plant owners (95) replied that they use slurry in farms and the form of slurry was told to be as liquid
(1%), as solid - sun dried (60%) and as compost (34%). The remaining 5 households give out slurry to others as
they do not have land to use it. According to plant users, as slurry remained in liquid form, it was difficult to
apply before it has been dried. Wet slurry presents transportation problems, if the fanner's fields are any distance
away. The mode of transportation was told to be carrying in Doko (89%) and transporting in bullock cart (6%).
It was reported that 79% of the users have not any problem in transporting slurry to farms. However, 6% of
them complained that porters are not ready to transport it if toilet is attached to the plant and other 2% face
problem to carry it as it is in liquid form.
When asked about the effects of slurry in agricultural production, 22% of the total respondents said that the
production remained same whereas 11% of them told they experienced significant increase and 8% felt some
increase. Few of them (9%) witnessed a decrease in production after the use of slurry bi-product in place of farm
yard manure. The increase in production was mainly observed in vegetable fanning (14%) and paddy (6%). It
was told that 67% of the biogas families used chemical fertilizer significantly, 13% used very little quantity and
others did not use it. When asked if biogas slurry have any effect on the use of such chemical fertilizers, 40% of
them told there was no change whereas 2% of them told they now use more quantity. 5% of the respondents
were said to have lowered the previously used quantity of inorganic fertilizer significantly and other (5%) used
lesser quantity after they started using biogas slurry. This certainly is an encouraging indication. It is worthy to
note that 41% of the users have been instructed by the company staff and another 26% by the experienced users
as regards the effective use of slurry.