Abstract. This paper provides an overview on the type and concentration of the major contaminants in industrial and domestic wastewater. The present study was conducted to analyze and collect data on hazardous substances in wastewater from petrochemical plants, pulp and paper mills, electroplating industries, power plants, and municipal sources (households and small industries).

Abstract. There presented experimental research results for the heat transfer behavior in the areas with the radiant heating systems based on the gas infrared radiators. The model of heatgravitational convection is formulated, that conforms to the transformation conditions of radiant energy coming from the radiators. A new approach to the parameter selection of the indoor climate with the radiant heating systems is developed based on the analysis and collation of experimental data for the temperature patterns and that of the heat flows of the object of research.Heat supply systems based on gas infrared radiators (GIR) are increasingly used to create routine microclimate in the production area with the on-site spaced work stations [1,2]. Such heating option is the most effective when a small part of the production areas of large workshops is utilized. In the latter case, it is unfeasible to use the traditional systems of "convection" heating of the entire room. However, the wide use of gas infrared radiators for this purpose is constrained due to the missing general theory of heat transfer under subject conditions of local heating. There performed the experimental study of temperature fields in the work areas using gas infrared radiators [3]. There defined a mathematical heat transfer model of conjugated arrangement [4] under GIR operation, which is based on the process theory of natural convection, developed for the closed-looped gas space with the thermally-conductive walls and local sources of heat release [5 -7]. But the model [4] based on a partial differential system is too complex to be widespread used for the parameters' selection of production area microclimate with the heat supply systems based on gas infrared radiators. There is an objective need for development of less complex selection procedure. The aim of this study is to develop a new approach to the parameter selection of the radiant heating system for the local production areas which differs from [4] by using the information on heat flows and temperatures of the work area derived from the preliminary experiments results.The modeling performed using the theory [4] demonstrated that the most crucial factors determining the thermal conditions of heat supply facility are air temperature and heat flows in specific sections of the work area. Air temperatures for GIR normal operation modes are determined in experiments [3] with high confidence.a Corresponding

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Abstract. Heat and mass transfer model for the numerical investigation of the evaporation process of a single droplet in water jet when moving through high temperature gases was developed. The integral characteristics of the process under investigation were calculated. The macroscopic regularities of water droplet evaporation, as elements of jet, in the high temperature gas mixture (as exemplified by combustion products of typical condensed substances) were determined.

The article demonstrates the results of the theoretical research devoted to the study of air flow interaction in hot-air heating systems of automatic modular boilers involving the use of fan heaters. The work quotes the results of mathematic simulation of various density air flows that are vertical to each other.