Conceptual Model of Energy Efficiency for Environmentally Safe Utilization of Liquid Pig Manure

Abstract

Introduction. The growth of production capacity of livestock enterprises results in increased environmental pressures on bio- and agrocenoses, created by potential energy carriers, one of which is liquid pig manure. Representative parameters, which characterize the energy value, are the total content of nitrogen and its various forms N2 = 3...8 kg/m3; phosphorus oxide P2O5 = 3...6 kg/m3; potassium oxide K2O = 2...4 kg/m3; chemical oxygen consumption to the mass of organic matter 1.2, biochemical 0.42. In parallel, the groups of Escherichia coli, staphylococci, enterococci, aerobic spore-forming microorganisms, various forms of eggs, protozoan cysts and Eimeria oocysts are also the environmental burden. In addition, the physical and rheological properties of liquid manure can have a significant impact on energy efficiency and the way of its further utilization. In terms of agricultural chemistry, the most rational option for its utilization is fractional use in the form of organic fertilizer that is possible only under the conditions of sanitary and epidemiological safety, which is an energy-intensive process depending on various factors. The purpose of this study is to develop a conceptual model of the energy efficiency of operational impacts in obtaining an environmentally safe cycle of utilizing liquid pig manure. Materials and Methods. The object of the study is the operational impacts in obtaining an environmentally safe cycle of utilizing liquid pig manure; the subject is the function of maximizing the energy efficiency of this object under the conditions of sanitary-epidemiological and agrochemical restrictions. There is conducted the analysis of factors and their categorization depending on the type of functional impact. Results. A conceptual model of operational impacts in producing environmentally safe liquid pig manure has been developed, which determines the components of specific energy consumption, the factors affecting them, and the restrictions imposed on them. This model is the source data for the factor analysis and statistical models. Discussion and Conclusion. The practical significance of the work is the identification and categorization of factors depending on the type of functional impact on the operations of the preparatory cycle of ecologically safe utilization of pig manure that can provide initial data for developing specific research methods and statistical models.