The paper investigates the mathematical modeling of anaerobic fermentation for the utilization of animal wastes. It analyzes various approaches to the mathematical modeling of anaerobic digestion processes. However, most of the models previously proposed do not take into account a number of key parameters such as the levels of micro and macronutrientls (such as K, Na, Ca, Mg, Mo, etc.), values of volatile fatty acids, C/N ratio, pH levels, extent of grinding, moisture, and others. This paper proposes a new mathematical model of anaerobic fermentation under industrial scale conditions. The model was developed on the basis of regression analysis and correlation. It found empirical relationships between biogas yield and 26 different parameters. These parameters are measured by appropriate biosensors in industrial production. Some of them have more significant influence on the fermentation process than others. Overall, the developed mathematical model has the potential to provide useful insights into biogas production and can be used to optimize anaerobic fermentation processes.

In the scientific work is presented the development of a method of selecting cloud computing platforms for servicing government agencies, which in future will form the Digital Government according to the Message of the President of the Republic of Qazaqstan N. Nazarbayev to the people of Qazaqstan «Qazaqstan way-2050: Unified goal, common interests, common future». And also in the article are considered forecasts of growth and the development of cloud services in various countries, including Qazaqstan. Based on the results of research of company «Boston Consulting Group» (BCG), reflected in the article «Qazaqstan on the way to the digital economy», according to the level of digitalization the economy of Qazaqstan occupies the 50-th ranking of 85 governments and is in a group with emerging digital economy. The digital divide between the leading governments and the lagging countries is increasing from year to year; therefore, the article reflects one of the ways to develop the digitalization of Qazaqstan's economy. Descriptions and characteristics of various companies included in the international rating of Cloud100 are described as the most successful and competitive companies in the world on cloud technologies. All companies from this list are distributed as the top 20 companies for PaaS services. A criterion for selecting companies of cloud services is proposed, taking into account international and national ICT requirements. The web-portal (www.cloud.kz) was developed to assess the quality of cloud services from various companies of the world, which are working on cloud-based services. The analysis of the introduction of cloud services in Qazaqstan, and their advantages, and benefits for the public sector was made. For the cloud-based service of the module PaaS are selected the most optimal and suitable companies from the Cloud100 list.

This article compares biogas plants for waste processing of various modifications, discusses their advantages and disadvantages, and describes a biogas plant of its own design of horizontal type, taking into account the local climatic and economic conditions of the development of farms in Kazakhstan. Considered the application of the bioreactor of its own production, which is developed taking into account the peculiarities of the methane fermentation process and climatic factors of Kazakhstan. The development of biogas technologies in the countries of the far and near abroad is described. The analysis of mathematical models of anaerobic digestion processes is carried out, several modeling directions are considered: models based on equations of chemical reactions (works by Buswell, Muller, Boyle, etc.), on empirical dependencies (works by Safili, Westerman. Models), based on kinetic dependences on the concentration of the substrate and cells or on the inhibition process (the work of Mono, Konto, Moser, Chen and Hashimoto). The models proposed by Druzyanov V.P. and Egorova E.N. are also considered, which take into account the dependence of metabolism on the rate of mass transfer, on the power of spontaneous mixing. But all the proposed models are generalizing, and are applicable only in laboratory conditions, and do not consider parameters such as the concentration of micro-macroelements (K, Na, Ca, Mg, Mo, etc.), VFA indicators, C/N ratio, pH, degree of grinding - n, humidity, etc. The effects of which on the fermentation process in the methane tank are more significant when used on an industrial scale. Based on the materials studied, a comparative analysis of all available mathematical models of anaerobic fermentation in three directions was carried out and their advantages and disadvantages were studied. At the same time, all these studied models are applicable only in laboratory conditions and are difficult to apply on an industrial scale. Thus, we have built our own mathematical model using regression analysis methods, taking into account a variety of influencing factors used on an industrial scale.