With the increase in the world population and the continuous development of technology, energy demands continue to increase. In general, the global energy needs are met by fossil sourced fuels. Depleting nature of fossil energy sources, their negative impacts on environment, increasing energy demands have led the efficient use of energy sources and the shift to local and renewable energy resources. Biogas is a renewable energy resource. Since organic wastes are used in biogas production, biogas offers a significant way of elimination of wastes and a source of energy. Animal wastes are the primary source of biogas. In this study, it is aimed to determine the biogas potential of Tokat province from animal wastes. Depending on this purpose, the amount of waste and biogas that can be obtained from animal waste and the energy potential that can be produced have been revealed by using the current data of the Provincial Directorate of Agriculture and Forestry. Energy equivalents of the biogas that can be obtained were also calculated. According to 2021 data, there are 303.952 cattle, 511.457 sheep and 247.333 poultry in Tokat province. Annually, 245.988 tons solid animal waste are obtained in Tokat province. In this study, conducted with the 2021 data of Tokat province, the amount of biogas that can be produced from animal wastes was calculated as 49 million m3/year. Districts with the greatest biogas potential are Merkez, Turhal and Zile respectively in 2021. The energy equivalent of biogas produced has been calculated as 292.000 MWh/year

In this study, biogas, compost and vermicompost plant location selection problem, and the optimal order of the facilities planned to be established are considered as a multi-criteria decision making problem. This study was carried out in order to determine the optimal suitability of biogas, compost and vermicompost (worm manure) production facilities obtained from pre-feasibility study in order to determine and evaluate the animal and slaughterhouse wastes that were exposed in Yozgat region. The facilities included in the ranking were determined within the scope of the in Pre-Feasibility and Investment Conformity Study Project for Recycling of Animal Wastes in the TR72 Region Sır. The total investment amount to be established in Yozgat province is $249.9 million and 15 biogas which can generate 69 MW / hour of electricity with an income of 149 million dollars / year. 11 compost production centres with a total investment value of $7 million and revenue of $4.4 million / year; Optimum ordering of 3 production centre facilities with a total investment value of 1.7 million dollars and a revenue of 1.9 million dollars / year and a total of 2.746 tons / year vermicompost was made. Ordering was performed using ARAS and COPRAS methods. The first three sequences proposed in the ranking of clusters of facilities that can be established are as follows; biogas clusters 8, 11 and 15; compost clusters 5, 9, 3; vermicompost sets 2, 1 and 3.

Cattle manure (CM) is mostly used as an inoculum in order to start-up of agricultural biogas plants or as a co-substrate in the anaerobic digestion of lignocellulosic content. Rumen fluid microbiota is also considered to be effective in lignocellulose digestion. It is known that microorganisms in the ruminal waste facilitate the hydrolysis of lignocellulosic structures. However, there are few studies on the inoculum effect of rumen microorganisms on bioreactor performances when rumen content is used as co-substrate and inoculum together with cattle manure, and it is not clear how rumen waste can be used in various anaerobic digestion systems. In this study, biogas production efficiencies obtained from lignocellulosic content in mono and cosubstrate (1:1 and 1:2 Volatile Solids) bioreactors formed by using ruminal waste (RW) and CM microbial communities were investigated. In order to determine the biogas production efficiencies, biomethane potential (BMP) experiments that simulate anaerobic digestion process conditions in a laboratory environment were applied. Treatment with 50% application of RW cosubstrate, 65.51% biogas and 70.64% methane production efficiency increases were achieved compared to monosubstrate CM bioreactor.