Effect of poultry waste on biogas production and plant nutrient content of effluent under solid state fermentation of cattle dung
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Date
2005
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CCSHAU
Abstract
Anaerobic digestion of organic wastes is gaining importance due to biogas recovery,
production of organic manure and environmental protection. Apart from cattle waste
biogas production has been reported from many other wastes like pig wastes, goat and
sheep wastes etc. Many reports of biogas production from poultry wastes alone and in
combination with other wastes like hog wastes, cattle dung are there. However, much
work has not been done on the solid state fermentation of cattle dung supplemented with
poultry waste.
Cattle dung & poultry waste were collected from the animal farm and poultry farm,
CCSHAU and analyzed. They were mixed in different ratios viz.100% CW (control),
90% CW +10% PW, 80% CW + 20% PW & 70% CW + 30% PW at approximately 17 %
Total Solid concentration. Batch digestion was carried out for a period of 8 weeks in 5L
aspirator bottles. The maximum biogas production was observed in digester with 30%
PW (0.247 L/L/day) & minimum in the control (0.065 L/L/day).The influent & effluent
were analyzed & highest enrichment of N, P &K was found in digester no. 4. (70% CD +
30% PW)
The digesters were then converted to semi continuous mode during which they were daily
fed with a particular amount of fresh substrate & same amount was taken out. The semi
continuous system was operated for retention time period of 10 days, 20 days & 30 days.
The maximum amount of biogas production was observed in all the digesters during RT
of 30 days & the least during the RT of 10 days. Also, the biogas production was
maximum in the digester no. 4 (70% CD + 30% PW), followed by digesters with 80%
CD + 20% PW, 90 % CD + 30% PW and minimum in the control during all the retention
time periods. Similar trend was observed in case of enrichment of N, P & K also.
Maximum enrichment during RT of 30 days, followed by RT of 20 days & minimum
during RT of 10 days was observed.
Thus, addition of poultry waste to cattle dung proved to be beneficial both in terms of
biogas production as well as enrichment of the effluent.