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UDC 628.166.085

Vasiliak L. M., SMIRNOV A. D.

Potential use of ultrasound in water disinfection

Summary

Ultrasound has been used long enough in engineering and medicine for diagnostics, visualization of underwater objects, surface cleaning and other systems. Using ultrasonic disinfection as a main or additional technology is impractical because of the long exposure time, high energy consumption and lack of regulatory documents. To improve the efficiency of disinfection equipment the manufacturers suggest additional ultrasonic water treatment in combination with oxidi­zers and UV irradiation. The data on possible use of ultrasonics both as an additional disinfection method and method of improving the efficiency of traditional technology from the point of view of the concept of establishing numerous barriers during disinfection is presented. Different types of ultrasonic effect for using in water disinfection systems are considered. Ultrasound provides for the extremely low disinfection efficiency compared to other traditional technologies, therefore it is not used as an independent method. Ultrasonic water treatment improves the efficiency of oxidation technologies. Combined action of ultrasonics and UV irradiation does not have any synergistic effect. For natural water and effluent after treatment according to the operating standards the standard UV dosages are sufficient to ensure meeting the mic­robiological standards. Additional ultrasonic treatment is advisable under special conditions. Quartz sleeves can be well cleaned with mechanical systems and chemical wash which is used by all the world leading manufacturers. Due to the particular hazard of ultrasonic contact impact on humans the process of ultrasonic treatment shall completely eliminate such potential effect.

Key words

disinfection , ultraviolet , wastewater , natural water , water treatment , ultrasound , chlorination agent

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UDC 69.055.5:628.147.25:628.247

KOSYGIN A. B., Khanin V. N., FOMINA I. V., Baranov S. V., Korabelnikov T. V.

Instrumental monitoring of water and sewage networks construction in Moscow

Summary

In order to improve the operation reliability in 2005 Technical Diagnostics Centre of MPUE Mosvodokanalwas established. The main challenges of the Centre were determined as follows: improving water and sewage network operation reliability, elimination of pipeline failures by testing the technical state and protecting from electrochemical corrosion. For this purpose the analysis of the underground pipeline integrity by inspection is carried out. Diagnostic measures beside TV inspection include testing the presence of ground current and soil corrosion, ultrasound diagnostics, testing insulation coating, ultrasonic thickness measuring etc. Upon the completion of diagnostics specific measures for each case are developed, and programs of network reconstruction and relaying are compiled. The quality of construction and reconstruction has a direct impact on the subsequent pipeline operation. Therefore instrumental monitoring of construction works is a necessary attribute in ensuring reliable operation of water and sewage networks. The advanced monitoring methods such as TV inspection of the inner surface; ultrasound and X-ray control; axial tension testing of the welded joints, control of the insulating coating provide for the improvement of the quality of the old pipeline rehabilitation and new pipeline construction.

Key words

water supply and sewerage networks , ultrasound , instrumental monitoring , X-ray investigation

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UDC 628.166

Zhurba M. G., Govorova Zh. M., Bakhir V. M., Ulyanov A. N.

On the Substantiation of Natural Water Disinfection Methods

Summary

Substantiation of the natural water disinfection method is necessary for assessment of great number of factors (qualitative composition of water, disinfectants properties and characteristics of technical disinfection means et al. and execution of preliminary technological tests for selection of a disinfectant meeting the following requirements: durable antimicrobial action, safety for human beings and animals, absence of generation of accompanying ballast salts, transformable organic substances, treehalogenmethane, economic advantage. Results of the comparative studies of efficiency of different disinfectants for reagent treatment of the Don and Tom rivers’ water at an experimental stands of 1–1,5 m³/hr capacity are presented.

Key words

ultra-violet irradiation , natural water , disinfection method , chloroform , chlorine-containing reagent , ultrasound

DOI 10.35776/VST.2022.01.01
UDC 628.166

Vasiliak L. M., Koudryavtsev N. N., SMIRNOV A. D., Strelkov A. K.

Ultraviolet plus ultrasound, and why again «there are no analogues in the world»?

Summary

Ultrasound has not been widely practiced in the world as a water disinfection technology. It has a low energy efficiency of disinfection in comparison with ultraviolet irradiation, therefore cannot be applied on its own. The combined effect of ultrasound and UV-irradiation does not have a synergistic effect, since these photo-biological and physicochemical processes are different and independent from each other. There are no criteria and methods for monitoring the effectiveness of ultrasound disinfection. The use of ultrasound is not regulated by sanitary rules and guidelines related to the disinfection of drinking and waste water. Cleaning of quartz covers is carried out using mechanical systems and chemical rinsing; international equipment manufacturers do not use ultrasound for this purpose. Personnel protection from the harmful impact of ultrasound is required.

Key words

potable water , disinfection , ultraviolet , wastewater , water treatment , ultrasound