Biogas energyproductionfromcattledungisaneconomicallyfeasibleandeco-friendlyin
nature. Butdependenceonlyoncattledungisalimitingfactor.Richnitrogencontaining
substrate additiontoextracarbohydratedigesterlikecattledungcouldimprovethebiogas
production. Detailedperformanceofthedigestersatdifferentratiosofcattledungand
soya sludgehasbeendiscussedinthispaperconsideringthecoldcountriesclimate.Soya
sludge substratenotonlyhashighnitrogencontentof4.0e4.8% butitalsohashigh
percentage ofvolatilesolidscontentintherangeof97.8e98.8%. Soyasludgeadditionalso
improved themanurialvalueofthedigestedslurryandalsoimprovedthedewater-ability
of thesludge.Resultsindicatedanincrementof27.0%gasproductionat25.0%amendment
of soyasludgeinnon-homogenizedcattledung(NCD)digester.Theamountofgas
production increasedto46.4%incaseofhomogenizedcattledung(HCD)withrespectto
NCD feedatthesameamendment.