Abstract
The present work highlight the fact that already the recurring cost of biogas is far less than other fuels and use of abundantly available water weeds like Eichhornia, Pistia and Salvinia will further bring down the fuel cost. The final results of the study were confirmed as follows: Among the aquatic weeds tested, Eichhornia generated the highest quantity of biogas in litres per kg volatile matter (236.3) as well as litre/day/litre digester volume (1.4) when retention time was maximum in hot season. This was closely followed by Pistia in the descending order, while Salvinia registered the least quantity. Values in the case of cow dung (control) for same parameters were 186 and 0.73 respectively. Gas production rates varied with variation in retention time and loading rates.
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