08-2025

Number 8 / 2025

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№8|2025

«ЭКОПОЛИМЕР» – «МАЙ ПРОЕКТ»: ЮБИЛЕЙ ГРУППЫ КОМПАНИЙ

 

35 лет – вверх по лестнице времени

Аннотация

В 2025 году нашей компании исполняется 35 лет. По сложившейся традиции каждые 5 лет мы подводим итоги предыдущего периода и намечаем пути дальнейшего развития.

Ключевые слова

 

№8|2025

WASTEWATER TREATMENT

UDC 628.356.324:532.5
DOI 10.35776/VST.2025.08.01

Kolbasov G. A., Korolev Mikhail, Raff Polina, Usmanov Radmir

Calculation of the longitudinal dispersion coefficient and number of cells in the model of series-connected reactors Part
1. Review and engineering analysis of methods

Summary

A review and comparative analysis of engineering methods for calculating the longitudinal dispersion coefficient and the equivalent number of cells in a model of series-connected reactors used to describe hydrodynamics in aeration tanks are presented. Both empirical and semi-empirical formulas (B. Chambers and G. L. Jones, K. L. Murphy and B. I. Boyko, P. Harremoes, K. Fujie, and others) and dimensional and substantiated models (B. M. Khudenko and E. A. Shpirt, O. Potier, and Y. Le Moullec) are considered. The classification of methods by the type of data used in calculations and by the degree of sensitivity to geometric and aerodynamic parameters is given. The criteria for the applicability of approaches at different stages of design, simulation and upgrade of the wastewater treatment facilities are formulated. The paper represents the first part of two articles and considers the calculation and interpretation of the number of cells in bioreactors. The second part will be on the practical application of methods by the example of aeration tanks of various configurations.

Key words

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№8|2025

WASTEWATER TREATMENT

UDC 628.35
DOI 10.35776/VST.2025.08.02

Kolbasov G. A., Korolev Mikhail, Raff Polina, Usmanov Radmir

Comparing bioreactors with activated sludge and moving bed
Part 1. Kinetic approach to the estimation of the efficiency (for discussion)

Summary

The objective of this work is to analyze the conditions that provide for moving-bed bioreactors actually surpassing the traditional activated sludge systems in efficiency. The test subject is kinetic and diffusion processes that determine the rate of substrate consumption in both types of reactors. The study uses Monod models supplemented with analytical equations describing substrate consumption in the biofilm with account of the diffusion limitations. The modes that provide for the kinetics of substrate consumption in a biofilm passing from zero order to 0.5 order and first order are considered, depending on the substrate concentration, biofilm thickness and diffusion coefficient. An analytical expression is proposed for determining the maximum substrate concentration, upon reaching which the oxidative capacity of a moving-bed bioreactor exceeds the similar indicator of an activated sludge bioreactor. Numerical examples and engineering formulas for practical application are given. The obtained results provide for estimating the real potential of moving-bed bioreactors and identifying the cases where their use is truly justified from the point of view of kinetics and diffusion, rather than perceived as a universal solution.

Key words

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№8|2025

WASTEWATER TREATMENT

UDC 628.35:532.5
DOI 10.35776/VST.2025.08.03

Kolbasov G. A., Korolev Mikhail, Raff Polina, Usmanov Radmir

Distribution of oxygen consumption in an aeration tank:
comparison of engineering approaches and computerized simulation

Summary

A review of engineering and numerical approaches to describing the distribution of oxygen consumption in the aerobic zone of an aeration tank, a key element of biological wastewater treatment systems is presented. The schemes indicated in the engineering literature (EPA Design Manual, S. Jeyanagam, R. Venner, J. Tchobanoglos, D. Rosso, D. A. Danilovich, and A. N. Epov) are considered. The listed approaches are compared with the results of the computerized simulation performed in the GPS-X software environment using the ASM3 model and the series-connected reactor model. The simulation was carried out for different temperature conditions reflecting seasonal variation. It is shown that the oxygen distribution schemes adopted in engineering practice do not take into account the effect of temperature, flow velocity and longitudinal dispersion, what can lead to significant deviations in the design of aeration tanks. A unified approach to comparing oxygen distribution processes is proposed. Practical recommendations for the use of computerized simulation to specify design solutions are presented.

Key words

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№8|2025

WASTEWATER TREATMENT

UDC 628.35
DOI 10.35776/VST.2025.08.04

Raff Polina, Mysik Sergei

Implementing a project of the local wastewater treatment facilities at the poultry farm operated by Chelny-Broiler LLC on a turnkey basis

Summary

The results of pre-commissioning activities at the newly built wastewater treatment facilities of the poultry farm Chelny-Broiler LLC are presented. Calculations of the biological wastewater treatment facilities of the poultry farm were performed using three mathematical simulation software applications: Activated Sludge Expert, Ecosim (developed by May Project JSC), GPS-X. Control of the process equipment of the local treatment facilities is provided by touch screens using a software and hardware suite developed by May Project JSC. It is shown that the use of nitri-denitrification technology at the treatment facilities of the poultry farm according to the modified three-stage scheme of the University of Ghent (MUG) provides for the effluent quality meeting the standards for the main chemical indicators.

Key words

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№8|2025

WASTEWATER TREATMENT

UDC 628.35:66.013.54
DOI 10.35776/VST.2025.08.05

Babichev Aleksandr, Mysik Sergei, Strukov Roman

Results of the commissioning activities of the first stage of biological treatment facilities in Ul’ianovsk

Summary

The results of pre-commissioning activities at the municipal wastewater treatment facilities of the city of Ul’ianovsk are presented. The works were carried out upon the project of upgrading the first stage of biological wastewater treatment facilities within the framework of the «Volga Rehabilitation» Federal Program as part of the «Ecology» National Project. The project of upgrading the first stage of biological treatment facilities is one of the shining examples of successful implementation providing achieving the design standards for water treatment, while the design and process commissioning works were carried out by one organization.

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№8|2025

PIPELINE SYSTEMS

UDC 628.144+620.193
DOI 10.35776/VST.2025.08.06

Chukhin Valentin, Makisha Nikolai

Factors affecting accelerated corrosion of galvanized pipes in hot water supply systems

Summary

The results of inspecting hot water supply systems of residential buildings in Moscow and other cities of Russia are summarized. The examined buildings had a wide range of hot water supply systems: single-zone and dual-zone, with the number of sections from 1 to 10, with the number of floors from 8 to 31, with risers up to 32 in number and combined into sectional units. A distinctive feature of all the buildings was the short service life of hot water supply systems (before time of rusty water and holes appearing in the pipes), amounting to 3–7 years instead of the period of 25 years provided for in CP 30.13330.2020 (clause 11.2). The causes of accelerated corrosion of galvanized pipes were identified by the degree of their effect. The determining factors causing accelerated corrosion are high oxygen concentration in raw cold water and disregard of the real protective capacity of the zinc coating while designing, installing and operating the systems. Particular attention is paid to cases where the causes of corrosion unevident. In order to clarify the effect of some factors causing accelerated corrosion, the results of additional studies are presented.

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№8|2025

WATER TREATMENT

UDC 628.161.3:66.063.6
DOI 10.35776/VST.2025.08.07

Volchek Aleksandr, Naumchik G. O., Belov Vadim

Substantiation of using an improved pneumohydraulic disperser to obtain fine gas-liquid dispersion

Summary

In the processes of natural and wastewater treatment, as well as in various branches of industry and agriculture, often a need for obtaining fine gas dispersions (with average bubble diameter less than 1 mm) arises in order to achieve a large interphase surface. Practical methods of obtaining gas dispersions are considered, along with the gas bubble mechanism while separating from individual pores during bubbling. Possible formation of fine gas dispersions by dispersing gas with a highly turbulent liquid flow is shown. The pneumohydraulic method is the most preferable, since it does not require high energy costs for dispersion, is highly reliable owing to the lack of moving parts, and provides for obtaining gas bubbles with a diameter of less than 1 mm, which will ensure high efficiency of dissolving relatively expensive gases (oxygen, ozone, etc.). An original device for hydrodynamic dispersion of gas for obtaining a fine gas dispersion allowing effective introduction of gas into the liquid being processed is described.

Key words

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Журнал ВСТ включен в новый перечень ВАК

Шлафман В. В. Проектирование под заданную ценность, или достижимая эффективность технических решений – что это?

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