RESULTS AND DISCUSSION
Biogas from animal wastes is an alternative viable rural energy, provided sufficient feedstock is available. The biomass (animal waste) availability in Kolar district is analysed using a spatial and temporal tools such as GIS. This uses a spreadsheet as biomass resource management tool, incorporating 'Maplnfo' as a GIS. Energy and biogas potential of livestock residues of all major groups of stock-raising animals were estimated based on the villagewise livestock population (2005) for Kolar district, Karnataka State, India. This disaggregated approach helps in accurate assessment of resources in a region, which would be useful in successful dissemination of biogas plants
Study shows that the average livestock density of the district is 0.81. It ranges from 0.68 (Bagepalli, Malm), 0.70 (Kolar) to a maximum of 1.09 (Gauribidanur). Village wise livestock density for all the taluks of Kolar district is shown in Fig. 2. Talukwise livestock density (number of villages in each region) is listed Table 2. It shows that in Kolar district 2960 villages have average livestock density in the range of 0-2, 275 villages have density in the range of 2-4, 69 villages in the range of 4-6, 24 villages in the range of 6-8, 10 villages in the range of 8-10 and 7 villages have an average density greater than 10.
Fig. 2: Village wise livestock density for all the taluks of Kolar district
Dung yield from buffalo and cattle could be used optimally for energy (biogas generation) as well as manure. Table 3, lists the biogas potential (resources to demand ratio) with four different cases. Considering case 1, the domestic energy requirement met by biogas of more than 60% population are: 13 villages of Bagepalli taluk, 27 in Bangarpat, 36 in Chikballapur, 29 in Chintamani, 16 in Gauribidanur, 16 in Gudibanda, 18 in Kolar, 43 in Malur, 15 in Mulbagal, 56 in Sidlaghatta, 32 in Srinivasapur. In addition to animal residues, green leaves could be used as biogas feedstock. Biogas potential of all taluks for case one is represented in Fig. 3 and the analyses shows that biogas could be a viable option in many villages with integrated feedstock (dung, litter).
Fig. 3: Biogas potential considering reource (low)/demand (low) case for all the taluks in Kolar district