1. Pylyp Hovorov, O.M. Beketov National University of Urban Economy in Kharkiv, Ukraine
2. Anastasiia Kindinova, O.M. Beketov National University of Urban Economy in Kharkiv, Ukraine
3. Irina Ivankova, O.M. Beketov National University of Urban Economy in Kharkiv, Ukraine
Modern conditions for the development of society are characterized by a simultaneous increase in requirements for the quality of life of people, on the one hand, and an increase in the number of opposing factors, on the other. In this case, the interaction of the components of the process is of a competitive nature, in which the improvement of some components occurs at the expense of the deterioration of others. One of the most important leaving systems of life support of society are water supply systems. Their development is characterized by the tendency of annual improvement in the quality of drinking water, on the one hand, and an increase in the number of factors that negatively affect its composition, on the other. This refers to the action of factors of physicochemical, bacteriological, mechanical and other origin. Moreover, their action in most cases is complex, often interrelated. However, studies carried out at the O.M. Beketov National University of Urban Economy in Kharkiv (O.M. Beketov NUUEK), under the guidance of Acad. Hovorov P.P., testify to the increasing role of the bacteriological factor. At the same time, the events of recent years and, especially, the occurrence and nature of the course of the COVID-19 pandemic are a vivid confirmation of this. Moreover, the further course of the development of COVID-19 indicated the threat of its even wider spread, against the background of the imperfection of the existing drinking water supply systems and the urgent need to improve their structures and fundamental principles.
Existing methods of water purification, as well as schemes for its disinfection, which are not able to meet the current requirements for the quality of drinking water and do not fully meet the requirements of energy efficiency due to the use of ineffective equipment and technologies. Bactericidal installations used in drinking water purification systems are based on the use of ultraviolet gas-discharge mercury-argon or mercury-quartz lamps. The presence of suspended solids in the water and the low light output of the lamps reduce the efficiency of the disinfection process. In addition, the design of the installations allows water purification only in places with very high bacterial contamination. In this regard, installations for water disinfection based on existing bactericidal lamps are ineffective and are located mainly at nodal pumping stations. These disadvantages can be summarized as follows:
- high energy consumption of systems for bacteriological purification of drinking water;
- concentration and local coverage of systems;
- large weight and dimensions of installations;
- operational problems associated with the inaccessibility of installations and the need for frequent replacement of radiation sources.
The presence of the noted shortcomings of the existing drinking water supply systems hinder their response to the challenges of the time, including the problems associated with COVID-19. Therefore, the search for new and improvement of existing technologies for disinfection of drinking water is an important and urgent task.
The aim of the work is to find effective ways to reduce the effect of harmful organisms in water on humans by disinfecting it using light radiation of a certain intensity and spectrum of radiation.
The task of the work is to study the effect of LED ultraviolet light sources on harmful organisms that are in water, and to determine the radiation spectrum that will have the greatest effect on them. Research conducted at the O.M. Beketov NUUEK, pointed out the possibility of solving these problems by using ultraviolet emitters based on LED light sources. Studies of the lighting characteristics of ultraviolet light-emitting diodes, carried out using the equipment of the O.M. Beketov NUUEK Lighting Measurement Center, indicated that their use is able to reduce the power consumption of the installation by an order of magnitude and their durability by two orders of magnitude. In addition, the use of LED emitters provides a 4-6 times reduction in the mass and dimensions of the installation, as well as the possibility of their installation at any point in the water supply network from the pumping station to the consumer (apartment, house, etc.). As a result, the possibility of bactericidal treatment of water is created at all elements of the water supply system, and most importantly, directly at its consumers, thereby minimizing the uncontrolled impact on its bacteriological indicators at any level. Thus, conditions are provided for a more reliable and safe supply of drinking water to consumers, especially in conditions of a possible uncontrolled impact on its biological indicators.
For certain conditions and purposes, the work proposed the structure of an energy-efficient bactericidal installation based on ultraviolet LED light sources, which provides a distributed multi-level disinfection of water in the drinking water supply system.
Based on the study of the effect of various types of light sources on organisms harmful to humans contained in water, recommendations have been developed for the construction of technical means of bactericidal action. Based on the research results, a mathematical model of the process of radiation exposure to harmful organisms in water has been developed, the scope and conditions for the use of installations have been established.
The practical value of the obtained results lies in the possibility of practical application of LED ultraviolet light emitters for the purification of drinking water at any stages of water preparation and at various levels of water supply.
To implement the considered approach, it is necessary to investigate the operation of LED light emitters in existing installations for bactericidal water purification and assess the fundamental possibility of widespread introduction of such technologies.
Кључне речиtestttt :
СИМПОЗИЈУМ Ц - Вода