Settling tanks are essential parts of wastewater treatment process and their correct design is therefore crucial for its operation. Modeling of flow in these tanks is difficult, therefore it is necessary to find right tool to perform as precise work as possible. In this article flow velocity measurement in two different secondary settling tanks in Slovakia is presented. Rectangular settling tank in Dolný Kubín and radial settling tank with horizontal flow in Nižná nad Oravou were chosen for this purpose. Data gained from these measurement events will be used for building a model and followed by simulation. Additional data from operation of wastewater treatment plants are also used during the work.
The essence of the application of the life cycle assessment study is to avoid increasing the quality of individual products and services at the expense of environmental degradation. Life cycle assessment is regarded as a universal method that is useful for any organization, regardless of the nature and scope of business. The effectiveness of wastewater treatment can determine and assesses potential risks associated with operation of wastewater treatment plant to the environment using appropriate methodology. The implementation of the method requires formulizing processes, using exact methods, allowing identifying the environmental impacts on the environment. Life cycle assessment belongs in industrialized and environmentally conscious states among ordinary tool of environmental management.
The scientific part is the introduction of general standards for specific wastewater treatment plant. The emphasis is given on correct understanding of the problem, regarding the definition of objectives, functional unit, system boundaries, and evaluation indicators. Based on the monitoring and measurement of pollutants in samples of wastewater, the data is processed by the competent life cycle assessment software.
Appraisals results of divided and combined rain sewers highly depend on the appropriate choice of model rain. The goal of this research is to verify the impact of different rain models on results of rainfall totals, calculated flow in the network and in their overall effect on the assessment. This research focuses on three main rain models - block rain (reduced), a synthetic rain and actual historical rain with data collected from meteorological stations allocated in the area of Vráble. Historical rain event for the area has been chosen as the one with highest overall intensity with duration of at least 1 hour. Modeling process has been conducted in interface of MIKE URBAN software.
Reverse logistics is one of the main processes for the realization of the circular economy. The aim is ensuring the material recovery of waste through its re-use or recycling in a way that is environmentally friendly and economically interesting. The municipality is responsible for the waste management of municipal waste streams. This paper deals with an efficiency of municipal expenditures dedicated to waste management from the expenditures allocated for environmental protection and the achievement of waste management objectives.
This research deals with creating a hydrodynamic combined sewerage overflow chamber model an ANSYS Workbench 19.2, Fluid Flow (Fluent). The 3D graphics model was created in the SpaceClaim modeling software, which serves as the basis for hydrodynamic modeling. The model was created according to a real combined sewerage overflow chamber in Banská Bystrica. The cores of the work are simulations that should correspond to the estimated flow in the combined sewerage overflow chamber. The aim of this paper is to compare the impact of inflow speed and flow rakes.
Stretching periods between precipitations have been recorded, and an adjustment of the dispersion of rainfall over the long run could be seen. An expanded number of these peculiarities have additionally been affirmed by the international panel on climate change. Due to this adjustment of the reallocation of water and the effect of high urbanization, the sewerage frameworks are affected. The aim of the work was to compare simulations of the rain event on the combined sewer overflow due to the reduced water quality recorded in the Trnávka River. The current state and the proposed building modification were compared because the current hydraulic and construction modification of the combined sewer overflow is absolutely not corresponding to the environmental regulations.
The research simulates the precipitation-runoff process in an urbanized area. The Slovak University of Technology in Bratislava, the Faculty of Civil Engineering, is chosen as the locality of interest. The construction of a mathematical model of the area of interest and the existing sewer network was used the storm-water management model software. The rain type was stimulated by the block type of rain and real precipitation events. The study results showed that some parts of the existing sewer network are overloaded already during a lower intensity rain event. Based on the results achieved in the future, it is considered with the proposal of measures for rainwater management.
The aim of the study is to assess the hydraulic capacity of the sewer network and sewer collector recovery in the urban catchment area of Trnava.
The analysis focuses on the evaluation of situations with different precipitation frequencies. Elaboration consists of modeling the current state of the assessed sewer collector B and subsequent loading of this collector by several block rainfalls. Based on the results of the analysis, the recovery of the sewer network proposed.
The aims of the research are to focus on the analysis of qualitative parameters of surface runoff from the urbanized area (parking, roadways); subsequently, to compare the measured concentration with the recommendations of Danish and Slovak standards. Rainwater sampling carried out at several sites in Serbia and Slovakia. In the analysis were monitoring, the qualitative parameters as pH value, water conductivity, chemical oxygen demand, and heavy metals. The results show the presence of copper, zinc, lead, aluminum, cadmium, chromium and nickel. The concentration of these parameters was several times higher than the allowed limit values. Based on these results, it is necessary to design measures to ensure surface runoff before infiltration.