Abstract:
The present study was aimed to investigate the anaerobic digestion process of a
mixing of organic kitchen wastes (cooked & uncooked) obtained from Sreepur
Shishu Palli and cowdung. Mixing of slurry is the basic requirement for better
performance of biogas generation. Attempts were made to investigate the effect
of mixing on biogas generation process and to study the feasibility of biogas
generation from human excreta.
The experimental results reveal that mixing significantly increases the biogas
generation. 24 hour's interval was found as optimum interval for mixing in this
experiment. Gas generation pattern from different mixing ratio of waste material
and cowdung reveals th'3t mixing of waste material with cowdung more or less
give the same amount of gas as from 100% cowdung.
The feed raw materials cowdung and cooked waste are partly digested. So in the
digestion process of cowdung and cooked waste, effective fermentation time
may be considered 60 & 80 days respectively. Experimental result also revealed
that use of uncooked waste as raw material, pre-digestion or hydrolysis is
required for efficient use of the biogas digester. A duration of 30 days appears to
be the most suitable pre-digestion period for the material of uncooked waste.
Then an attempt was also been made to assess the potential for the
implementation of biogas technology in Bangladesh. Assessment of potential for
biogas technology in Bangladesh indicates that the best possible utilization of
organic wastes ( cowdung, sheep, goat and poultry dropping, human excreta,
solid wastes) through biogas generation can meet up 15% fuel wood demand of
Bangladesh. Therefore the application of this technology in rural and semi
urban area of Bangladesh will provide an excellent renewable source of energy
and nutrient and will also improve human health and environment.
