Uses of Bioslurry (Biogas Residue) as Inexpensive Product for Animal Feed

Kırkpınar F. , Atan H.

4th International Students Science Congress, İzmir, Turkey, 18 - 19 September 2020, pp.11-19

  • Publication Type: Conference Paper / Full Text
  • City: İzmir
  • Country: Turkey
  • Page Numbers: pp.11-19


Due to the increasing prices of fossil fuels and global warming, the extension and utilization of renewable energy resources has becoming an important component of a sustainable global energy strategy. Biogas is a clean, efficient, and renewable source of energy, which used as a substitute for other fuels in order to save energy. A biogas system is a combustible mixture of gases (mainly composed of 50 to 70 percent methane, 30 to 40 percent carbon dioxide) produced by micro organisms when livestock manure and other biological wastes are allowed to ferment in the absence of air in closed containers that it results in two end-products: energy-rich biogas and nutrient-rich digestion residue. Biogas can be used directly for cooking and for generation of electricity and heat. While biogas is used to produce energy, the large potential of bioslurry has often been overlooked. One of the outputs of a biodigester, next to the biogas, is bioslurry. The digested mixture of liquids and solids 'bioslurry' and 'biosludge' are mainly used as organic fertiliser for crops and many other purposes. Bioslurry is not only a good fertilizer; it also provides an excellent animal feed, both directly and indirectly. Dried bioslurry can safely be used as a feed supplement to cattle, fish, and poultry. Most of ammonia nitrogen in bioslurry can be utilized by a growing bacterial biomass, to be converted into amino acids. Also, the fermentation process also produces B12 vitamin in considerable amounts. Feeding animals with animal waste is a common practice, but since in the biodigester, pathogens from the livestock manure are mostly eliminated and minerals become more readily available for take-up, so uses of animal waste to run a biogas system and then feed the biogas slurry to animal feed, it is better than raw waste as feed. Also feeding of bioslurry results in reducing feed cost and a lower price of animal products; it contributes to self-sufficiency in protein, phosphorus and other expensive nutrients in feed rations. It is concluded that bioslurry of biogas can be used as a locally sourced, reliable and inexpensive source of feed in countries where there is a shortage of animal feed, as well as a high rate of degradation of pastures and forests, leading to sustainable agricultural production. The purpose of this review is to reveal the potential availability of biogas slurry that can be inexpensive product in animal nutrition and producing is to promote.