Based on a conventional 6 m3 digester
PARAMETER
Cow Dung
Replacer
Volume of biogas produced per day by the6 m3 digester
3.5 m3/day
3.5 m3/day
Weight of Slurry fed per day:
100 kg/day
100 kg/day
Weight of wet manure (assumed to be 50% of slurry by weight):
50 kg/day
2.5 Kg/day
Number of cattle required to produce 50 kg of manure daily:
50/(4.5 × 0.60) = 18.5 or 19 Cattle (assuming 60% of dung is collected)
0
Number of households whose cattle will be involved:
19/2.5 = 7.6 households
0
Assumed calorific value of biogas:
20 MJ/m3 [3-5]
20 MJ/m3 [3-5]
Joules produced by digester per day:
70 MJ/day
70 MJ/day
Joules available per household per day:
9.211 MJ/day or 9,211 kJ/day
depends on total households and their requirement
 
SPECIAL PRECAUTIONS
  • This product uses sterile inputs and as such free from beneficial/pathogenic microbes.
  • This is an analog of Cow dung.
  • This is intended to benefit the end users where cow dung is scarce.
FOR BETTER RESULTS:
  • Conventional biogas digesters require 10 kg of cattle waste to produce an equivalent quantity of biogas.
  • Addition of rice husk soaked in water at 20 per cent level to this product increases the gas production by 20%.
  • Worldwide, it is a standard practice to use Cow dung alone or in combination of other substrates like Human excreta, Poultry Litter, Kitchen Waste, Municipal Waste, Agro Waste etc.
  • Cow dung, coming from a rumen animal is known to contain the native microbial flora that aids in faster biogas production.
  • It has also been reported severally that cow dung is a very good starter for poor producing feedstock.
  • The hydraulic retention time for cow dung is 40 days and gas production starts at the 5th day.
  • Maximum gas is produced at the 26th day which is 0.0263 m3.
  • The standard value of gas production yield from cow dung is considered as 0.037m3/kg.
  • Among fermentative organisms, Bacteroides succinogens, Butyrivibrio fibrisolvens, Clostridium cellobioparum, Ruminococcus albus and Clostridium sp. were predominant.
  • Ramasamy et al.observed that a clear differentiation existed in the type of cellulolytic bacterial distribution in rumen and biogas digester.
  • Whereas in rumen, Ruminococcus sp. alone accounted for 60 percent of the total population, in the biogas digester the predominant species belonged to the genera Bacteroides and Clostridium rather than the genus Ruminococcus.
  • Later Ramasamyreported that Ruminococcus flavefaciens, Eubacterium cellulosolvens, Clostridium cellulosolvens, Clostridium cellulovorans, Clostridium thermocellum, Bacteroides cellulosolvens and Acetivibrio cellulolyticus were some of the other predominant fermentative bacteria present in cattle dung-fed digesters.
  • However, of late, Animal sheds are maintained away from normal human inhabitation and Biogas plants in these areas are challenged by non proximity to cow dung. 
  • Hence the need arises for an artificial product to mimic this cow dung.​

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