The effectiveness of influence of biocomposite of fungi Basidiomycota upon the emission of carbon dioxide from cattle manure

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The effectiveness of influence of biocomposite of fungi Basidiomycota upon the emission of carbon dioxide from cattle manure

Vorobel M.1, Moroz V.2, Kaplinskyi V.3

Institute of Agriculture of Carpathian Region of NAAS

5 Hrushevskoho Str., Obroshyne village, Pustomytiv region, Lviv oblast, 81115, Ukraine

Goal. To determine the effectiveness of the influence of biocomposite of fungi Basidiomycota in different dilutions on the emission of carbon dioxide from cattle manure at mesophilic conditions of anaerobic digestion (in vitro). Methods. The study was carried out with the use of chemical, analytical and mathematical-statistical methods. Results. By results of the conducted researches it is established that after entering biocomposite of fungi Basidiomycota in manure substrate of cattle, regardless of the ratio of dilution (1:10 and 1:5), they observed a decrease in anaerobic fermentation during the study period, as evidenced by a decrease in pH on 1.9 - 2.1 units. It is established that at addition to metane-generating raw materials (cattle manure) of biocomposite of fungi Basidiomycota in dilution of 1:10 the output of carbon dioxide was below the control on 1.48 dm3, and at a dilution of 1:5 -- on 1.58 dm3. Consequently, the use of biocomposite of fungi Basidiomycota in mesophilic conditions of anaerobic digestion of cattle manure (in vitro), in a dilution of 1:10 and 1:5 reduces the output of carbon dioxide, respectively, on 93% and 100%. Conclusions. It is experimentally proved and scientifically substantiated the effective impact of biocomposite of fungi Basidiomycota in the emission of carbon dioxide from cattle manure. Based on the results obtained during the research it is found out that the most effective influence on the level of carbon dioxide detects biocomposite of fungi Basidiomycota in a dilution of 1:5, and therefore, it can be used as an effective means to reduce the level of carbon dioxide to maintain clean environment during the fermentation of by-products of animal origin.

Key words: organic matter, greenhouse gases, atmosphere, anaerobic fermentation, biocomposite.

Successful development of the agrarian sector of economy is impossible without stable development of animal husbandry [1], which accounts for production of more than 33% of gross output in the structure of agro-industrial complex of Ukraine [2, 3]. The intensification of production of livestock products is accompanied by the formation of a large amount of waste the annual growth in the number of which causes a serious threat to the natural environment, its ecosystems, due to contamination air, water, soil, etc. and requires respect for balance between increasing production of products and new approaches in recycling and utilization of waste [2-10]. It is known, that in the process of rotting of organic substances of animal and plant origin gaseous substances are formed, including greenhouse gases, which falling into the atmosphere, absorb heat and detain thermal radiation from the surface of the planet, thereby raising the average air temperature lead to formation of atmospheric aerosol and acid rains, etc. [3, 5, 11]. The most common among greenhouse gases are carbonic gas (CO2), methane (CH4), and nitrous oxide (N2O), hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride - a direct-acting greenhouse gases as they directly cause the greenhouse effect [2, 11, 12]. In the process of an intensification of agrarian production growth release of greenhouse gases in the atmosphere is observed [3-5]. Thus, since 1800 concentration of carbonic gas in the atmosphere increased more than by 25 %, concentration of methane has more than doubled, concentration of nitrous oxide grew by 8% [3, 13], and for the last decades the share of their influence on strengthening of greenhouse effect is, respectively - CO2 up to 50%, CH4 - 15%, N2O - about 5-6% of the general contribution to global warming [11, 12].

Agriculture on the scale at emissions of greenhouse gases, although concedes to energy and industry, but still is a powerful source of them, both in Ukraine and in global scale [3, 6, 14]. In particular, according to the assessments of the World organization for food and agriculture, the animal husbandry is responsible for 18% of all emissions of greenhouse gases - it is more than emissions from transport (14%) [4, 7, 15-17]. According to the last estimates by the Food and Agriculture Organization of the United Nations (FAO) [18], emissions of greenhouse gases in the agriculture, forestry and fish sectors increased practically twice the last 50 years and have a tendency to the further growth on 30% by 2050 y. if are not carried out a number of measures for improvement of an ecological situation.

Consequently, agriculture in general, and the branch of animal husbandry in particular has a considerable influence on the environment and is an important source of pollution, that causes climate changes, resulting in the problem of minimization at emissions of greenhouse gases becomes one of the most important for mankind [9, 10]. In this context, the development and realization of appropriate measures aimed at limiting at emissions of greenhouse gases in the future is essential importance.

One of the ways reduces the level of greenhouse gases, and in particular carbonic gas, is increase their absorbers, namely afforestation of the territory of the state by restoration of the woods and afforestation (the average forest cover of Ukraine is 15,9% and the average forest cover of European countries is 37%) [16]. As it is known that forests of the world annually absorb up to 25 billion tonnes of carbonic gas, however, is not able to fully reduce the concentration emissions of greenhouse gases into the environment [19]. Another way of reducing at emissions greenhouse gas from waste of livestock while simultaneous utilization is their use as alternative energy source by an anaerobic fermentation of biomass, that allows to receive high quality organic fertilizer and biogas that is suitable for producing electric or thermal energy [3, 9, 17].

Taking into account the above, the problem waste management of the branch of animal husbandry, which are one of the largest pollutants of harmful gases of the natural environment, remains relevant, and therefore the search for effective means for decrease level of their emissions from dung of cattle has important scientific and practical importance for solution environmental problems of activity of agro-industrial complex as a whole.

The purpose of the researches is to determine the effectiveness of the action biocomposition of fungi Basidiomycota in different dilutions on the level emission of CO2 with dung of cattle under mesophilic conditions of anaerobic fermentation (in vitro).

Materials and methods. The researches was conducted in the laboratory of ecology of the Institute of agriculture of the Carpathian region NAAS. Dung samples for determining efficiency of the influence biocomposition of fungi Basidiomycota in different dilutions on the level emission of CO2 taken in SE «EF Obroshyne», where the herd of Ukrainian black-and-white dairy cattle (western intra-breed type) is kept. The methane forming raw materials (dung) investigated in triple repeated in the such variants: I variant - control (dung without the introduction of preparation), II variant - biocomposition of fungi Basidiomycota in dilution 1:10; III variant - biocomposition of fungi Basidiomycota in dilution 1:5.

The process of methane fermentation was conducted in vitro. Biomass (dung of cattle) was introduced into an experimental a capacity diluted with water in corellation of 1:1. During an experiment conducted mixing of the investigated substrate by intensive shaking of the capacities. Analogical conditions the process of methanogenesis were as in the control variant, where the anaerobic fermentation of the substrate was due to the natural microflora of dung, as and in the experimental of analogues with the use different variants dilutions biocomposition of fungi Basidiomycota.

The amount of CO2 in the dung mass was determined by the method of N.V. Chibisova [20].

The method of V. Shatskyy, O. Sklyar and R. Sklyar was used as the basis for the research [21]. An important factor the process of methanogenesis is maintaining at the optimal indexes of fermentation. Therefore, in the process of realization of experiment at every stage of methanogenesis of the dung (hydrolysis, oxidation, acetogenesis, methanogenesis) in all variants an optimal temperature regime was supported and control of the level pH of the environment.

The acidity was determined using a device pH-Meter Type N5170 (production of Poland).

The statistical analysis of the obtained results of researches was conducted with the use the methods of variation statistics with the help a standard package Microsoft Excel and Attestat application programs. The arithmetic averages value (M) and an error of arithmetic averages (m) were calculated. The difference between the arithmetic averages values was considered statistically probable at: *p<0.05; **p<0.01; ***p<0.001.

Research results. The research was conducted under a mesophilic regime of fermentation while maintaining the temperature within 33°C. In the procces of the experiment, reaction of the nutrient environmental (pH), which determines the orientation of anaerobic fermentation, was investigated. During the fermentation of dung under mesophilic conditions, namely of passing of the stages: hydrolysis, oxidation (acidogenesis), the formation of acetate (acetogenesis), which amounted to 33 days, in the control and in the experimental variants it is established growth the level pH from 6.5 to 7.6 units (Fig. 1).