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UDC 628.2/.3:658.52.011.56
Regotun A. A., Daineko O. N., Smirnov Aleksandr Vladimirovich
Automated control of the treatment facilities on the basis of mathematical models
Summary
The applicability of the mathematical models in the control of wastewater treatment facilities in terms of the operational issues solutions is considered. A possible option of using the software package on the basis of ASM mathematical models in the control of the biological treatment plant with retrofitting into the control system of the entire wastewater treatment facilities is presented. The general principles of control system building with the integrated mathematical model of the biological treatment process are described. The comparative analysis of the popular advanced software simulation packages and the simulation software developed by My Project Company is sited. By the example of the standard aeration tank configuration the possible and easy integration of the software into practically any advanced SCADA-system is demonstrated. The contrary case is described: the use of the software in the highest level of the automated process control system of the wastewater biological treatment.
Key words
biological treatment , energy efficiency , mathematic modelling , automated control system , technical process , hardware and software
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UDC 628.32:62-523
Galitskov S. Ya., Kichigin V. I., Strelkov A. K., Tsypin A. V.
Automatic control of the local rinse water treatment facilities
Summary
On the basis of the system analysis of the operation of local rinse water treatment facilities of the steel band dip galvanizing line the structure of a process unit as a controlled object was developed. The vectors of the output coordinates of control and disturbing actions are defined It is shown that the controlled object is multi-dimensional, unsteady and has an unstable structure. The results of the study were used in designing and introducing an automatic control system of the local rinse water treatment facilities.
Key words
mathematic modelling , galvanic production , treatment facilities , controlled object , object structure
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UDC 628.35.004.4
Noskova I. A., Bazhenov V. I., Epov A. N.
The use of simulation modeling packages for wastewater treatment technologies
Summary
The subjects of the study were: comparative analysis of software packages for simulation modeling of wastewater treatment processes to manage design and operation issues; and also assessment of basic data for the formation of mathematical model inputs. The basic parameters of the description of the most complicated ASM activated sludge models have been analyzed. The results of the studies are represented by the analysis of the examples: distribution of COD fractions under local conditions of Russia and some other countries; typical irregularity of wastewater flow and basic pollutants hourly input; design and measured oxygen uptake rate (OUR); model time calibration process, optimization of the denitrification zone in aeration tank for MUCT process. The analysis of the advanced software defined GPS-X (Hydromantis, Canada) design software as the most complete and comprehensive product. The suggested technique includes a set of measures: determining COD fractionation with the use of OxiTop (WTW, Germany) analyzer; assessment of basic parameters of irregular basic pollution mass input; respirometry studies; statistic processing of data obtained at the facilities. In the process of simulation modeling the hydrodynamic structure of the wastewater treatment facilities appears as series-connected mixer chambers. The number of chambers is assigned depending on the length and width of the facility, flow velocity, mixing rate, availability of internal baffles, and also inner recycle streams. The simulation model provides for the optimization of the following parameters: zone ratio in the aeration tank, sludge age, dissolved oxygen concentration, recycle ratio values, as well as the parameters of the automatic control system.
Key words
wastewater , biological treatment , mathematic modelling , ASM models , simulation modeling , GPS-X software
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UDC 621.929
DOI 10.35776/VST.2023.07.06
Grigor’eva Anastasiia
Study of the optimal mode of sludge agitation in the receiving tank of a wastewater pumping station
Summary
Sludge agitation in the receiving tank of a wastewater pumping station is a rather serious problem due to the high risks of the pumping equipment failure, sludge caking and decay inside the tank. As a rule, sludge settling control methods provide for emptying only the area close to the suction nozzles of the pumps. In the rest of the tank, the caked sludge is periodically washed out by hand during maintenance or minimum filling. A comparison is made between two methods of sludge agitation in the receiving tank of a wastewater pumping station. In the first case, sludge is agitated hydraulically, i. e., using pipelines located along the perimeter of the tank. In the second, conical mixers of improved geometry are used, that is, sludge is agitated mechanically. A comparison of mixing efficiency was made using CFD-modeling. According to the results of modeling the hydrodynamics of mixing, during the operation of conical mixers, no stagnant zones is actually formed in the near-bottom mixing area.
Key words
treatment facilities , pumping station , mathematic modelling , conical mixers , sludge agitation
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UDC 628.35
DOI 10.35776/VST.2024.09.04
Stepanov S. V., Kharkina O. V., Avdeenkov Pavel, Lazunin Maksim, Ponomarenko Ol’ga
Mathematical simulation of wastewater treatment processes in aeration tanks
Summary
A new version of the mathematical model of wastewater treatment processes in aeration tanks with biological nitrogen removal and biological-chemical phosphorus removal has been developed based on the mutual complementation of the VODGEO/SamGTU and ASM2d methods. The «inverse problem» of technological calculation of aeration tanks has been solved mathematically, i. e. by determining the pollution concentrations in effluent with available data on the qualitative and quantitative composition of the raw wastewater for the specified values of process and design parameters of the facilities. An algorithm for providing quantitative process recommendations has been developed. Following the conducted research, the Potential software was developed designed for the primary acquisition, technological calculations and providing recommendations to the personnel of the treatment facilities. The implementation of the software will reduce the operating costs by optimizing the process flow pattern of the biological wastewater treatment facilities in the shortest possible time.
The study was carried out within the framework of Agreement No. 4951GS1/85526 with the Federal State Budgetary Institution «Foundation for Assistance to Small Innovative Enterprises in Science and Technology».
Key words
wastewater , biological treatment , kinetic constants , mathematic modelling , NII VODGEO/SamGTU methodology , calculation of aeration tanks , ASM2d model , formulas of enzymatic kinetics
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UDC 628.17.001.4
Shchetinin A. I., Esin M. A., Malbiev B. Yu., Regotun A. A.
Simulation of Biochemical Processes of Wastewater Treatment as a Basis of WWTFs Retechnologization
Summary
In accordance with the requirements of environmental legislation it is necessary to introduce the best available technologies at biological WWTFs. In the course of development of plans of reconstruction and capital repair of sewerage treatment facilities it is necessary to carry out the variant examination of flow charts of treatment on the basis of imitation simulation. A detailed analysis and comparison of different models of processes with activated sludge have been conducted. Treatment processes at large number of facilities have been simulated with the help of the Ecosim 3P program developed by the Ecopolymer Company. It is shown that the imitation simulation makes it possible to ensure a high accuracy of treatment results prediction. An approach to the retechnologization of treatment facilities based on mathematical models of biochemical processes with activated sludge has been developed. This approach tested experimentally at a whole number of biological treatment stations has made it possible to carry out their retechnologization resulted in considerable reduction of biogenic elements in treated water.
Key words
biological treatment , removal of nitrogen and phosphorus , best available techniques , retechnologization , mathematic modelling
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UDC 628.144:006.015.7
Neparidze R. Sh., Urakin M. V., Belyaev N. N., Sokolov A. I., Kovyrshina R. N., Neliubina A. A.
Results of hydraulic calculations of the water supply and distribution system in Tobolsk, the Tyumen Region
Summary
The progress of process surveys and hydraulic calculations of the water supply and distribution system of Tobolsk by the specialists of «RVKN» LLC (Moscow), PAO «Sibirsko-Ural’skaia Energeticheskaia Kompaniia» (Tyumen) and its Tobolsk branch are covered. The work is based on the theoretical foundations and methods in the field of hydraulic calculations of water distribution networks carried out by leading Russian research workers, as well as the rich experience of numerous similar works carried out by the specialists of «RVKN» LLC in previous years. Process surveys included an on-site survey of the water distribution system rating the relevant characteristics of pumping equipment and a manometric survey. In the course of hydraulic calculations 25 different options were considered that involved seasonal changes in the modes of operation of the municipal water supply system with account of the compliance with the fire extinguishing requirements. At the same time special attention was paid to including the newly commissioned (upgraded) Sokolovsky water intake facilities. The analysis of the calculation results showed a low relevant process and structural reliability of the water supply and distribution system, especially of the currently operated Zhukovsky water intake facilities. The stage-by-stage program for the development of the municipal water supply and distribution system (WSDS) provided for the measures aimed at the optimization of the operation in the coming years, as well as the development of a reliable and prospective water supply scheme for Tobolsk.
Key words
assessment of technical state , hydraulic design , mathematic modelling , water supply and water distribution system , manometric survey , detailization and simplification of the calculation model , surplus hydraulic head , inefficient water losses , relevant characteristics of pumping equipment , process and structural reliability
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UDC 628.35
DOI 10.35776/VST.2024.11.03
Stepanov S. V., Egorova Yu. A., Kharkina O. V., Avdeenkov Pavel, Nesterenko O. I., Lazunin Maksim, Strelkova T. A., Zlobin Ivan
Results of the mathematical simulation of wastewater treatment processes in aeration tanks at the Samara Municipal Wastewater Treatment Facilities during the upgrade and commissioning
Summary
The results of mathematical simulation of the operation of the existing biological wastewater treatment facilities using POTENTIAL software that was used for 10 months to optimize the operation of aeration tanks during the upgrade and commissioning are presented. The data on the quantitative and qualitative composition of wastewater supplied to the aeration tanks adopted in the project are compared with the actual data for the period 2023–2024. Calculation of the actual values of the growth and aerobic age of the activated sludge using the formulas included into the POTENTIAL software showed that the sustained required quality of the effluent in relation to ammonium and nitrites was observed with an aerobic age of activated sludge of 24.1–27 days and a wastewater temperature of 19.1–24.8°C, provided the concentration of N–NH4 was less than 1 mg/l, and N–NO2 was less than 0.1 mg/l. As a result of calibration and verification of the mathematical model embedded in POTENTIAL software, the values of kinetic constants and coefficients were selected for a separate process line «aeration tank No. 7 – secondary settling tank No. 5» resulting in predicting the operation of the aeration tanks with a high degree of accuracy (deviations between the calculated and actual data were less than 8%).
Key words
wastewater , kinetic constants , mathematic modelling , NII VODGEO/SamGTU methodology , calculation of aeration tanks , ASM2d model , formulas of enzymatic kinetics , biological removal of nitrogen and phosphorus from wastewater
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UDC 628.35:661.5
Esin M. A., Smirnov Aleksandr Vladimirovich
Advanced methods of designing biological treatment facilities
Summary
The data of the analytical reviews and practical results of calculating and designing advanced wastewater treatment facilities are presented. The analysis of the methods of designing biological wastewater treatment facilities (construction rules and regulations SNiP, ATV) and the software for mathematical simulation of the facilities operation («EcoSim», GPS-X etc.) is made together with the hydrodynamic continuum mechanics software as applied to calculating the flow conditions at the treatment facilities. The mathematical model of biological wastewater treatment process is based on the analysis of the relationships of enzyme kinetics of the wastewater pollutant transformation and makes a connection between the parameters of the raw waste and effluent, dissolved oxygen concentration and activated sludge. The principles of designing and calculating the facilities for biological treatment of municipal and industrial wastewater including the use of nitri-denitrification and biological phosphorus removal processes have been developed. The practical experience of using the mentioned methods in front end and design works.
Key words
biological treatment , nitri-denitrification , mathematic modelling , energy efficiency of equipment , wastewater composition , biological phosphorus removal
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