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1
Content available Computer Dynamic Modelling of Communal Sewage Networks
100%
Bogdan L. , Petriczek G. , Studziński J.
Journal of Automation Mobile Robotics and Intelligent Systems
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2014
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tom Vol. 8, No. 4
51--58
EN
In the paper two algorithms of dynamic modeling of communal sewage networks are presented. It is assumed that the hydraulic parameters of segments, namely canal shape, canal dimension and roughness are constant. The goal of the algorithms is to calculate the main sewage network parameters using only the continuity equation and the Manning formula. In the algorithms, fundamental algebraic formulas describing the filling heights in the canals and the sewage flow velocities are also used. The network model based only on the Manning formula and continuity equation in difference form and not on the liquid equations as it is used commonly by modelling the sewage networks is simpler and faster in calculations. While modeling the networks fixed network structure and slowly changing sewage inflows into the canals are assumed. The forecasted inflow values are stated and the investigation presented concerns the sanitary and mixed gravitational sewage networks.
2
Content available Mathematical modeling and computer aided planning of communal sewage networks
100%
Bogdan L. , Petriczek G. , Studziński J.
Journal of Automation Mobile Robotics and Intelligent Systems
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2014
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tom Vol. 8, No. 2
17--23
EN
In the paper the basic questions connected with modeling of wastewater networks are presented. Methods of modeling basic sewage parameters and appropriate calculation algorithms are described. The problem concerns the gravitational networks divided by nodes into branches and sectors. The nodes are the points of connection of several network segments or branches or the points of changing network parameters as well as of location of sewage inflows to the network. The presented algorithms for networks hydraulic calculation concern sanitary or combined sewage nets. It is assumed that the segments parameters such as shape, canal dimension, bottom slope or roughness are constant. Because of these assumptions all relations considered concern the steady state conditions for the network. The calculation of flow velocities and the filling heights in the segments of the wastewater net are carried out for the known slopes and diameters of the canals.
3
Content available Modelling the steady state of sewage networks as a support tool for their planning and analysis
100%
Petriczek G. , Studziński J. , Bogdan L.
Operations Research and Decisions
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2015
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tom Vol. 25, No. 3
39--57
EN
Fundamental questions connected with the modelling of communal sewage networks have been considered and formulas used to model the functioning of the basic network have been analyzed. The problem described concerns gravitational sewage networks divided by nodes into branches and sectors. Simulation of the steady state functioning of sewage networks is commonly carried out on the basis of nomograms in the form of charts, in which the relations between network parameters like channel diameters, flow rates, hydraulic slopes and flow velocities are described. In traditional design, the values of such parameters are simply read from such nomogram chart tables. Another way of simulating the functioning of a network is the use of professional software, like SWMM, that models sewage flows along the channels by means of differential equations describing the movement of fluids. In both approaches, the user is a mechanical operator of a “black box” procedure. In this paper, another way of simulating the functioning of sewage net-works has been presented. Numerical solutions of nonlinear equations describing the physical phenomena of sewage flows are applied and explained. The presented algorithms were developed to model the steady state of a sewage network enabling a quick analysis of the network parameters and the possibility of fast, simple and comprehensible network modeling and design.
4
Content available remote Modyfikacja powierzchni węgli aktywnych stosowanych w technologii specjalnego uzdatniania wody
100%
Bogdan L. , Szczodrowska B. , Neffe S.
Inżynieria i Ochrona Środowiska
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2000
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tom T. 3, nr 3/4
287-297
PL
W specjalnych (wojskowych) technologiach uzdatniania wody sorpcja zanieczyszczeń na węglu aktywnym definiowana jest jako proces podstawowy. Węgle aktywne do zastosowania w wojsku powinny spełniać następujące wymagania: mieć wysoką mechaniczną i termalną odporność, powinny posiadać zdolność adsorpcji małych i dużych związków organicznych, powinny posiadać charakter bakteriostatyczny i bakteriobójczy. Węgle powinny dawać się regenerować i płukać, powinny być łatwo dostępne i tanie. Przeprowadzona modyfikacja produkowanych sorbentów polegała na poprawie ich parametrów i uzyskaniu ich biologicznej aktywności. Uzyskany efekt pozwala otrzymywać materiał węglowy posiadający parametry szczególnie przydatne w wojskowej technologii uzdatniania wody.
EN
In special (military) water treatment technologies the sorption of contamination on active carbon is defined as the basic process. Active carbons used for military applications should fulfil the following requirements: high mechanical and thermal resistance, they ought to possess the abilities to adsorption of small and big samples of organic compounds, they should have biostatic and bactericidal characteristics. The carbons should possess abilities to regeneration and swilling, they should be easily available and cheap. The executed modification of produced sorbents was targeted on improvment of their parameters and obtaining of their biological activities. Gained results allowed to obtain the carbon material with its parameters especially useful in the field of water treatment technology.
5
Modelling and calibration of a municipal wastewater treatment process.
88%
Bogdan L. , Łomotowski J. , Nahorski Z. , Studziński J. , Szetela R.
Systems Science
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2000
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tom Vol. 26, nr 2
125-144
EN
A model of the activated sludge process for the wastewater treatment plant in Rzeszów is presented. It consists of: models of the basic vessels, primary clarifiers, aerator basins and secondary clarifiers, linked and partially loop, as-well as equations describing the physical and biochemical transformations taking place in the vessels, sedimentation in the clarifiers and biological processes changing the influent wastewater chemical composition. The model parameters were estimated in two steps: in the first step the active volumes of the vessels were estimated from the experiment performed in the plant; and in the second step, parameters known from the literature were used as the initial guess and then calibrated to fit the observations made during normal plant operation.
6
Content available remote Mathematical and neural network modelling of a wastewater treatment plant
88%
Bogdan L. , Łomotowski J. , Nahorski Z. , Studzinski J. , Szetela R.
Archives of Control Sciences
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2000
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tom Vol. 10, no. 1/2
89-118
EN
A comparison of a few methodologies of building models useful in wastewater treatment plant maintenance is performed. One is mathematical modelling of the activated sludge process. It consists of modelling of the basic vessels: primary clarifiers, aerator basins and secondary clarifiers, linked and partially looped, as well as equations describing the physical and biochemical transformations going on in the vessels: sedimentation in the clarifiers and biological processes changing the influent wastewater chemical composition. The models' parameters were estimated in two steps. In the first step the active volumes of the vessels were estimated from the experiment performed in the plant. In the second step, parameters known from the literature were used as the initial guess and then calibrated to fit the observations taken during normal plant operation. Concerning other methodologies, results from the black box modelling of the performance of the plant with the neural network are given. The neural network and the time series models are also applied for prediction of the influent wastewater.
7
Content available remote Mathematical model and its calibration for Rzeszów wastewater treatment plant.
88%
Bogdan L. , Łomotowski J. , Nahorski Z. , Studziński J. , Szetela R.
Environment Protection Engineering
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1998
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tom vol. 24, nr 1-2
95-112
EN
A model of the activated sludge wastewater treatment plant in Rzeszów is presented. It consists of submodels of primary clarifiers, aeration basins and secondary clarifiers, including equations describing the physical and biochemical transformations taking place in the vessels; sedimentation and thickening in the clarifiers and biological transformations of the influent wastewater components in the aeration tanks. The model parameters were estimated in two steps. In the first step, the active volumes of the tanks were estimated from the results of the planned experiment carried out in the plant, and in the second one, kinetic and stoichiometric parameters were estimated based on the data collected during regular plant operation.
PL
Przedstawiono model matematyczny oczyszczalni z osadem czynnym dla Rzeszowa. Model składa się z submodeli osadników wstępnych, komór napowietrzania i osadników wtórnych. Uwzględniono w nim odpowiednie równania opisujące fizyczne i biochemiczne transformacje: sedymentację i zagęszczanie w osadnikach oraz biologiczne transformacje składników dopływających ścieków w komorach napowietrzania. Przeprowadzono dwustopniową estymację parametrów modelu. Najpierw, na podstawie wyników czynnego eksperymentu znacznikowego, określono objętości czynne obiektów. Następnie oszacowano wartości parametrów kinetycznych i stechiometrycznych na podstawie danych zebranych podczas normalnej pracy oczyszczalni.
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