Сафоник, А. П. and Присяжнюк, О. В. and Ільків, І. В. (2022) МОДЕЛЮВАННЯ ПРОЦЕСУ ОЧИЩЕННЯ СТІЧНИХ ВОД З УРАХУВАННЯМ ЗМІНИ ТЕМПЕРАТУРИ. Вісник Національного університету водного господарства та природокористування (2(98)). pp. 275-287.

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Abstract

Розроблено математичну модель очищення стічних вод, яка описує процеси, що протікають на очисній споруді з урахуванням зміни температурного режиму. Запропоновано метод і побудовано алгоритм розв’язання відповідної нелінійно збуреної задачі «конвекція – дифузія – тепломасообмін». Наведено результати розрахунків розподілу концентрації забруднення з врахуванням та без врахування температури протягом часу очистки рідини.

Title in English

MODELING OF THE WASTEWATER TREATMENT PROCESS TAKING INTO ACCOUNT TEMPERATURE CHANGE

English abstract

Domestic wastewater contains pollution of mineral and organic origin, while industrial wastewater differs in both composition and concentration depending on the area of usage. Regardless of the type, all wastewater requires mandatory treatment, as it contains pollutants that can significantly exceed the permissible standards of pollution concentration. Filter systems that provide acceptable levels of pollution concentrations are used to prevent the harmful effects of impurities on the environment. The main difficulties in choosing a rational treatment scheme arise from the fact that wastewater contains particles of varying degrees of dispersion, and the aggregate state is largely determined by the temperature, pH of the solution, component composition, and other factors. Therefore, the main factor when choosing a water treatment method is the phase state of the substance. The phase-dispersion characteristic of impurities, regardless of the type of effluents and the place of their formation, makes it possible to propose a specific method of processing for each group of classification. When choosing the type and design of settling tanks for industrial wastewater, it is necessary to take into account their chemical and physical properties, as well as the influence of technological conditions of production and local factors on the composition of wastewater. The main indicators are: the temperature of wastewater entering for treatment; concentration of suspended substances and their physical properties. Considering the rather high cost of conducting natural experiments, the urgent task is to develop a mathematical model of the wastewater treatment process taking into account the temperature mode. Based on this, a mathematical model of wastewater treatment that describes the processes taking place at the treatment plant taking into account changes in the temperature regime was developed in this work. The method and constructed algorithm for solving the corresponding nonlinearly perturbed problem convection – diffusion – heat and mass transfer" was proposed. The results of the calculations of the distribution of the pollution concentration with and without taking into account the temperature during the time of cleaning the liquid are given. The obtained results make it possible to predict and automate technological processes of wastewater treatment in more detail and comprehensively.

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