Liquid manure in systems of energy cogeneration on family farms

Abstract

Natural liquid manure as a suspension of overall cow and related categories excreta, with out of admixtures of bedding matherials and residues of anused feed, is diversified energetic source, because it can produce gas, heat, electric power, fuel, etc. Teh introduc tion of natural liquid manure in treatment towards energy production, contribute not only to energy efficency of farm, but also to better envirnoment protection because of increased emission of sulfur dioxide, carbon dioxide and nitrogen dioxide, compared to combusti on of fossil fuels. In addition, a significant ammount of pathogens are destroyed and weeds seeds that can be found in manure germination energy is significantly lower. This paper presents optimal technology and technical solutions of liquid manure usage for improving energy efficiency of small farms, and also the folloving total usa ge of liquid manure as organic fertilizer. In this paper, a mini farm of 50 dairy cows, which are now common i Serbia has been considered. Methods of collecting, proce ssing, preparation, and use of liquid manure, in our conditions are not met at a wider application, due to the extensive production. Huge ammounts of this organic fertilizer with graet nutritive potential in forms that are easily accessible to plants are not used in any way, and are uncontrollably released to envirnoment cousing pollution to envirnoment in any possible way. That practise must be stopped. Economic effects in countries with less developed livestock production, such as ours, suggest that this issue must be given adequate attention and redirected the way of production, which, with secondary products can significantly improve the outcome. This paper gives direction to it.