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Media of rapid filters is the subject of abrasion and coverage by biofilm which partially is not removed during backwashing. The empirical tests done for predicting the optimal backwash intensity as a function of water temperature proved that in computing the sand expansion it is necessary to take into consideration not only changes of the grains’ shape but also the density of sand grains as the result...
Modelling of the wastewater treatment plant in Żory, Poland was carried out using the BioWin 2.1 simulation program based on the real data regarding acquired in 2016-2017. It was made the static and dynamic calibration of the developed model of the treatment plant. The calibration and verification procedure was performed. In order to determine the optimal working conditions for the WWTP Żory, a series...
Indoor swimming pools belong to ventilated facilities in which due to the complex nature of air, heat and moisture flow there are difficulties in shaping the conditions of the indoor environment, suitable for the occupants. The aim of the presented research was to assess the thermal, humidity and flow conditions in the actual ventilated school swimming pool. The assessment was carried out based on...
At the stage of designing a ventilation system for a swimming pool, it is difficult to predict with full conviction what thermal and humidity conditions will prevail in the actual facility and what will be the impact of ventilation on its real energy performance. Often it is only during the operation of the swimming pool that a full assessment of its proper functioning takes place. Various research...
The performance of modified anchor impellers in stirred tanks is investigated. The classical anchor impeller is taken as a reference, then the upper part of the blade arm is curved at different degrees (α). Three geometrical configurations are explored, namely: α = 0° (which corresponds to the standard shape of anchor impellers), 45°, and 90°. The study is achieved numerically by using a finite volume...
The use of plastic materials has become a standard in sanitary systems design. Due to numerous advantages of polymers, heating and hot water systems made of them have become an alternative to the ones made of traditional materials such as steel or copper. The values of forces working on particular elements of compensators as well as their displacement result from linear thermal elongation of segments...
In this work the analysis of corrosion for ductile iron pipes with diameters of 350 and 500 mm was performed. Two phenomena regarding the pipes coating deterioration have been recognized: corrosion and abrasion. The corrosion tests performed on different coatings in a neutral salt spray for up to 1000 hours indicate that this method is applicable for a rough external surface of centrifugally casted...
A simple and accurate method of solving the set of equations describing Variable Declining Rate Filters in a bank was described, based on the literature, including among the others the earlier papers of the author. Only the mathematical model developed by Di Bernardo was considered, as the most practical from the engineering point of view.
The standard and modified liquid flow regulators were tested in this work. In modified regulators a cylindrical core hole was installed in the regulator axis. It takes the shape of a cylinder, without a base being tangent to the wall of the regulator. It is placed on the wall opposite to the outlet. The „core-hole" effect in the outflow or water from the tank contributes to the stabilization...
Poland is one of the heaviest users of district heating systems in Europe, and those district heating systems are mainly coal-fired. This study describes the correlation between emission of gaseous air pollutants and the combustion parameters of WR coal-fired water grate boilers (WR-25, WR-10, WR-8M). Air pollution emissions loads were measured during boiler work in conditions other than standard...
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