The use of expanded polystyrene filters is a promising method for tertiary treatment of domestic waste effluent where biologically treated effluent is filtered through a layer of buoyant polystyrene beads. The advantage of such filters is in the absence of backwashing pumps, containers of clean washing water, while having low energy costs, high resistance of polystyrene to various chemical contaminants that may be in the effluent, easy automation of switching modes.The article describes the features of the design and principles of the expanded polystyrene filter operation with an upward filtration flow which works in automatic mode. The article includes the comparison of operation and the structural technological characteristics of polystyrene filters with disc filters, which are usually used in practice of tertiary-treatment of effluent in the UK.Experimental results were obtained from the operation of expanded polystyrene filters with an upward flow of filtration at two operational wastewater treatment plants. The effectiveness of the tertiary-treatment of waste effluent was evaluated by measures of BOD and COD in non-filtered and filtered samples, as well as total suspended solids during the months of the year and hours of the day. The filter demonstrated an average removal of 40% BOD, 28% of COD and 66% of TSS.

According to the strategy of environmental development of Ukraine until 2030, in order to increase the Environmental Performance Index (EPI), it is planned to reduce the energy intensity of GDP. One of the most polluting industries is the thermal power industry, and therefore reducing the emission of harmful gases, in particular nitrogen dioxide, is an important environmental problem. The share of electricity production by thermal power plants and thermal power plants in the electric power complex is significant, which leads to environmental risks due to large emissions and discharges of harmful substances by these enterprises into the environment. The magnitude of such emissions depends on the efficiency of the circulating cooling systems, which affects the rational use of fuel and water resources and, accordingly, the state of the environment. Increasing the temperature of the exhaust steam by reducing heat transfer through the contaminated heat exchange surface increases the pressure in the condenser of steam turbines and reduces the power of the turbine, which increases fuel consumption and increases the amount of emissions of harmful substances. One of these emissions is nitrogen dioxide, which is a harmful toxic compound and is classified as a greenhouse gas. The Purpose of the work is to calculate oxide carbon emissions depending on the thickness of the deposited layer on the heat exchange surface of the condensers of steam turbines of TPP. The concept of a particle of harmful emissions associated with the emergence and growth of a layer of pollution of the heat exchange surface of the condensers of steam turbines of TPP, expressed in fractions of a unit, is introduced, and an analytical expression is obtained for this value. Based on the theories of fuel combustion, heat transfer, as well as the concept of a part of harmful emissions associated with the emergence and growth of a pollution layer, the dependence of the amount of harmful emissions associated with fuel combustion at TPPs on the thickness of the pollution layer of the heat exchange surface of steam turbine condensers is obtained. Keywords: environmental pollution, thermal power plants, carbon monoxide, heat exchange surfaces.

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