Tag:disinfection

№2|2010

PROBLEMS, PERSPECTIVES

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UDC 628.162.8

KINEBAS A. K., JAKOVLEV V. Ju.

Introduction of Two-Stage Scheme of Water Disinfection at Waterworks of St. Petersburg

Summary

It is told about the modernization of systems of water disinfection at waterworks of St. Petersburg using sodium hypochlorite and ammonium sulphate. It has allowed to liquidate completely the threat of affecting the city’s territory and population with highly toxic substances (gaseous chlorine and ammonia) owing to possible failures at industrial sites of the State Unitary Enterprise Vodokanal Sankt-Peterburga and at transportation of liquefied chlorine and ammonia solutions, and also to exclude chlorine and ammonia influence on the environment in the case of equipment depressurization. Introduction of the technology of water disinfection with ultra-violet irradiation has favored the realization of the concept of multiple barriers at potable water disinfecting at the city’s waterworks.

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№11|2016

ADVANCED TECHNOLOGIES AND EQUIPMENT

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UDC 628.166.085

Kostyuchenko S. V., SMIRNOV A. D., Pokhil Yu. N., Bagaev Yu. G.

Introduction of UV-disinfection at the Novosibirsk wastewater treatment facilities

Summary

Water recycling in the modern municipal services is a comprehensive task. On one hand the city inhabitants should be supplied with high-quality drinking water meeting all the sanitary and hygienic requirements; on the other hand the discharged municipal effluents shall not produce any adverse effect on the environment. To fulfil these tasks the most advanced disinfection technologies that ensured meeting all the microbiological requirements to the drinking water and effluents were introduced at the Novosibirsk water and wastewater treatment facilities. The use of ultraviolet irradiation provided for the efficient multi-barrier protection in drinking water purification and environmentally safe disinfection of wastewater.

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№9|2014

DRINKING WATER SUPPLY

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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.

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№4|2017

WASTEWATER TREATMENT

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UDC 628.166.085

SMIRNOV A. D., Strelkov A. K., Tkachev A. A.

Revisiting the selection of wastewater disinfection technology

Summary

Environmental law enforcement in relation to discharging chlorine and organochlorine contaminants induces the use of advanced safe and efficient chlorine free methods of wastewater disinfection. The use of ultraviolet irradiation provides for meeting all the requirements imposed on the technology of wastewater disinfection eliminating any adverse impact on the environment. The use of this technology eliminates possible penalty charges for polluting the environment with chlorine and organochlorine contaminants. The economic comparison of two disinfection methods (the application of sodium hypochlorite and UV-irradiation) reveals significant operational benefit when introducing UV-disinfection. Annual savings of operational expenditures is 50% and more at the comparable capital expenditures. The advantages of UV-disinfection are as follows: efficiency in relation to all types of indicator and pathogenic microorganisms, whereas chlorine-containing chemicals do not often ensure fair efficiency in viruses and protozoa elimination; no by-products are generated; no adverse impact on the water bodies is produced (consequently, no penalties); no threat of overdosing; easy and simple control over the disinfection process; no need in dosing system and additional control systems; disinfection effect independence from fluctuations of effluents quality within the limits of the design parameters; minimum footprint; no additional facilities are needed (e. g., contact tank for dechlorination); possible retrofitting into the existing buildings or facilities, for example, in the process of wastewater treatment facilities upgrade and chlorination replacement; low operational expenditures (lamp replacing once in a year and a half – two years and energy saving). In this context switching to chlorine free disinfection technologies that eliminate the formation of organochlorine contaminants is a correct solution.

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№7|2017

WATER DISTRIBUTION NETWORK

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UDC 628.166.094.3

Grabovskii P. A., Gorobchenko A. I.

Adaptive control method in water disinfection

Summary

Pathogenic microorganisms present in natural water sources can be partially removed in the process of physical and chemical treatment (coagulation, contact clarification, filtration with presedimentation or flotation and other methods). Their final inactivation can be provided by oxidation with chlorine, chlorine dioxide, sodium hypochlorite and chloramines, ozone, as well as by UV-irradiation. The problems arising during chemical water disinfection are considered. The actuality of the problems is related to the decrease in water consumption, in big cities in particular. Owing to this the time of water retention in the distribution network increases, and in the far points the concentration of disinfectants in water is unacceptably low. The complexity of determining the chemical dosages conditioned by continuous fluctuations in the water consumption and water quality is shown. The operation of a network with the use of EPANET 2.0 software was simulated. The disinfectant concentration changes in water along the network length for «short» and «long» sections were studied. The dosing patterns for a network with two disinfectant injection points were developed. The practicability of adaptive control of the disinfection process is shown and its algorithm has been developed. The introduction of the proposed control scheme will provide for not only economic benefit by reducing chemical consumption but also for improving the reliability of water disinfection, improving the quality of the disinfected water, developing the data base for optimization and predictions, improving the customer service level.

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№10|2019

ABROAD

DOI 10.35776/MNP.2019.10.09
UDC 628.3:62-278

Kofman V. Ya.

Micromotors – a recent trend in developing water and wastewater treatment technologies (a review)

Summary

Micromotors are autonomous, performing certain functions, self-propelled microdevices based on inorganic, organic or biological materials. Implemented in a micromotor design are two functions: autonomous movement and effective capture and/or destruction of various chemicals, including pollutants. To ensure autonomous movement the micromotor device provides for the creation of local thermal, acoustic, chemical gradients arising from asymmetric morphology or surface structure. The movement is provided through the use of various energy sources including light, electric and magnetic fields, ultrasonic waves or chemical “fuel”. The chaotic trajectory of micromotors throughout the solution provides for the highly efficient interaction of the chemicals immobilized on their surface with the targeted pollutants or detectable substances. The most elaborated principle of creating autonomous movement is the generation of a recoil impulse at asymmetric formation of gas microbubbles as a result of a chemical reaction. Currently, the main studies on the use of micromotors in water purification processes are carried out in the areas of analysis of aqueous media, removal of heavy metals, organic pollutants, dyes and oil products, as well as water disinfection. It is estimated that micromotors possess unique capabilities in the field of detection and removal of pollutants in aqueous media due to a combination of adsorption and catalytic properties with autonomous movement.

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№9-1|2011

WASTEWATER TREATMENT

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UDC 628.3.004.69

Modernization and Reconstruction of Sewage Treatment Facilities of the Municipal Unitary Enterprise Vodokanalof the City-Resort of Anapa

Summary

Features of the wastewater treatment in resort towns are described. The ways of enhancement of operation efficiency of sewage treatment facilities of the MUE Vodokanal of the city-resort of Anapa are considered. A brief characteristic of two variants of modernization of treatment facilities are presented. The first variant stipulating the partial replacement of equipment makes it possible to reduce expenditure and enhance efficiency of wastewater treatment at the most unsatisfactory operating parts of the flow chart. The second variant demands significant capital investments, changes in the flow chart and replacement of equipment, but at the same time economic efficiency and the required quality of wastewater treatment according to all the indicators are achieved.

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№3|2010

PROBLEMS, PERSPECTIVES

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UDC 621.357.1:628.162.8

KINEBAS A. K., JAKOVLEV V. Ju., NEFEDOVA E. D., LOBANOV F. I.

Water Disinfection with Weak Sodium Hypochlorite at Water Supply Stations of St. Petersburg

Summary

The method of water disinfection with sodium hypochlorite produced from common salt solution using the electrolysis method at the place of use has been introduced at two largest water supply stations, Southern and Northern, of St. Petersburg. The use of sodium hypochlorite of low concentration makes it possible to avoid the necessity of transportation and long-term storage of a ready solution. The technology introduced makes it possible to minimize considerably the risk existing in the case of the use of liquefied chlorine and reduce the operation expenses comparing with strong solutions of sodium hypochlorite.

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№8|2011

POTABLE WATER SUPPLY

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UDC 628.166:628.1.033 (470.61-25)

FESENKO L. N., Ignatenko S. I., Skryabin A. Yu., Fedotov R. V.

Ensuring of Wastelessness and Ecological Compatibility of Technology of Sodium Hypochlorite at the ChlorefsUnits

Summary

The ways of solving the problem of ensuring of wastelessness and ecological compatibility of the technology of large-tonnage production of sodium hypochlorite at electrolysis stations of high-capacity water treatment facilities are considered. It is shown that for conditioning of water used for preparation of salt solutions the method of acid decarbonization is more preferable as excluding the generation of some accompanying waste water. It is considerably cheaper than the cationite softening and makes it possible to use the salt of any quality. The saturators for preparation of saturated salt solution should be equipped with the washing systems similar to high-rate water supply filters with wash water discharge into the system of treatment and its reuse in the scheme of dissolution.

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№1|2010

PROBLEMS, PERSPECTIVES

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UDC 664:628.381.3.001.

Gubanov L. N., Sevostyanov S. M., Katraeva I. V., Kulyomina S. V., Dyomin D. V.

Processing of Sludge of Biological Treatment of Food Industry Enterprises Wastewater

Summary

The technological scheme of processing of surplus activated sluge of anaerobic-aerobic biochemical wastewater treatment facilities at the food industry enterprises with production of high-quality compost and a disinfecting amino-acid composition from is proposed.

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№1|2010

PROBLEMS, PERSPECTIVES

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UDC 628.162.5.001.2

Ganbarov E. S., Safarova A. S.

Treatment of Wash Water of Filters and Water Disinfection at Water Treatment Complexes of the Azerbaijan Republic

Summary

Results of studies carried out for determination of efficiency of clarification and investigation of influence of quantity and quality of the wash water supplied to a head of treatment facilities on the subsequent process of treatment are presented. For full disinfection of water it is proposed to use a disinfectant received by electrolysis of a solution of salts of alkaline metals and mineralized ground water directly at the territory of water treatment station.

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№7|2011

POTABLE WATER SUPPLY

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UDC 628.16/.31.085

IVANOV A. S.

Determination of the Minimal Efficient Doze of UV-Irradiation

Summary

The process of study of water for optimal and valid choice of power of the ultraviolet irradiation system is described. The effectiveness of water treatment by ultraviolet irradiation depending on the content of suspended particles in water is shown. A diagram of the dependence of performance of ultraviolet disinfection on the water transmission coefficient is presented. The necessity of conduction of the preliminary model ultraviolet irradiation and drawing up of the conclusion before the delivery of equipment to the real object of the customer is substantiated.

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№4|2019

DRINKING WATER SUPPLY

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UDC 628.16.065.2-926:628.16.094.413.094.3

Pokhil Yu. N., Bagaev Yu. G., Mamaev V. V., Novoshintsev V. N., Valuyskikh I. V., Zhagin V. A., Boldyrev Viacheslav Viktorovich, Shokolov A. N., Belousova T. V., Smirnov V. P.

Optimization of flocculation and chlorammoniation processes at the water treatment facilities of the city of Novosibirsk

Summary

The results of long-term studies to improve the design and operating parameters of the pumping-filtration stations in Novosibirsk are presented. The schemes of the developed processes and technical means for the enhancement of disinfection and flocculation are given. The results of research on improving the processes of mixing and flocculation to provide for reducing the consumption of coagulant by more than 50% without water quality degradation achieving precipitation of the major sludge amount in the flotation chambers and at the entry of the sedimentation tanks, respectively, reducing the pollution load on filters and water consumption for their backwash. Based on the results of the research on the improvement of the technology of chlorammoniation a predictable and well-controlled process has been developed with a guaranteed decrease in the concentration of chlororganic compounds within the limits of the MPCs as well as the elimination of chloramines with the highest degree of oxidation and nitrification. The process ensures the reduction of secondary water pollution and bacteriological and hydrobiological pollution of the water treatment facilities.

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№9-1|2011

POTABLE WATER SUPPLY

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UDC 628.162.84.004.1

Sivolov G. E., Karmalov A. I., Medrish G. L., Piskov M. V., Panchuk S. A., Zorin A. P.

Experience in Operation and Enhancement of Water Disinfection System with the Use of Sodium Hypochlorite

Summary

Over ten years ago at the water treatment facilities of the city of Seversk the operation of the disinfection system with the use of liquid chlorine was converted to the use of sodium hypochlorite. At present the modernization of equipment due to the application of aerohydrodynamic mixers was made, the processes of mixing the reagent with water being treated were intensified, the operation of reagent facilities was completely automated including the dosing of sodium hypochlorite proportional to water flowrate.

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№5|2012

WATER AND WASTEWATER COMPANIES (VODOKANALS) IN RUSSIA

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UDC 628.17.001.4

Kostyuchenko S. V., Khrenov K. E., Khramenkov S. V., Filatov N. N., Glinik A. I., Kvalvasser A. I., Koudryavtsev N. N., Zhoukov V. I., Petrova O. N., Parilov P. S.

The experience of UV equipment operation at the Lyubertsy Wastewater Treatment Facilities in Moscow

Summary

The experience of the ultraviolet equipment operation for effluent disinfection at the Lyubersty wastewater treatment facilities in Moscow is presented. The modular design of UV equipment provided for establishing large-scale facilities with minimum footprint for UV-disinfection of municipal effluents (1–3 million m3/day capacity and higher). The high performance is ensured by the unique UV-modules with specially designed superpower bactericidal low pressure lamps supplemented by numerous systems of monitoring, control and energy saving. Equipping the entire wastewater treatment facilities with UV disinfection modules will ensure significant improvement of the environmental and sanitation-and-epidemiological conditions of the Moskva and Pekhorka Rivers.

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№8|2010

POTABLE WATER SUPPLY

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UDC 628.162

Getmantsev S. V., Linevich S. N.

Treatment and Disinfection of the Don’s Water at Contact Filters Using the Coagulant SKIF180of the Latest Generation

SUMMARY

The high efficient compact flowchart of treatment and disinfection of the Don’s water has been developed on the basis of experimental and theoretical studies carried out. In the process, mixers, coagulation chambers and sludge blanket clarifiers or settling tanks are eliminated from the scheme. The use of the method of contact coagulation with the high effective coagulant of SKIF™180 mark makes it possible to reduce reagent consumption by 65–70%, to exclude the necessity of primary disinfection of water with chlorine or reduce chlorine consumption to minimum, to ensure aluminum residual in water within the limits of MPC, to stabilize conditions of water treatment and reduce considerably the cost of water treatment.

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№12|2017

DRINKING WATER SUPPLY

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UDC 628.166.085

Volkov S. V., Tkachev A. A., Piskareva V. M.

The use of ultraviolet irradiation as a part of multibarrier disinfection schemes

Summary

In order to ensure reliable disinfection of drinking water in relation to viruses, protozoa and other pathogenic organisms resistant to chemical methods, i. e. to prevent waterborne diseases increasing the dosages of chemicals – chlorine or chlorine-containing substances is needed. However at that, chlorination by-products including trihalomethane are formed. The use of multibarrier disinfection schemes is one of the most actual solutions in drinking water purification that provides for the high efficiency at significant reduction of unfavorable side-effects. One of the prevailing multibarrier technologies of drinking water disinfection is the combined use of ult­raviolet irradiation and chlorination. Ultraviolet irradiation has become one of the basic technologies of multibarrier schemes. The experience of using UV-irradiation in combination with different chemicals at the water treatment facilities in Russian and foreign cities – Nizhny Novgorod, Budapest, Vienna is described. Retrofitting advanced multibarrier schemes of purification and disinfection of surface water will provide for improving significantly the sanitary and epidemiologic protection of the population and improving drinking water qua­lity.

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№4|2019

ENVIRONMENTAL PROTECTION

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UDC 628.166

Pokhil Yu. N., Novoshintsev V. N., Kamaletdinov A. R., Kostyuchenko S. V., Tkachev A. A., SMIRNOV A. D.

Use of UV-disinfection in water supply and wastewater disposal systems of Novosibirsk

Summary

Vodokanal of the city of Novosibirsk has been one of the first water and wastewater utilities in large Russian cities to completely switch to the disinfection of drinking water and wastewater with ultraviolet irradiation. Advanced multi-barrier technologies for the preparation of drinking water (combined use of UV disinfection and chlorination) provided for obtaining safe drinking water of high quality. UV units introduced at the pumping-filtration stations (PFS-1 and PFS-5) of the city provide for the reliable disinfection of filtered purified water up to the requirements of SanPiN 2.1.4.1074-01-01, perform a barrier role against pathogenic microorganisms of bacterial, viral and parasitic nature. UV equipment installed at the municipal wastewater treatment facilities with a total capacity of 600 thousand m3/day ensures the required degree of disinfection in accordance with SanPiN 2.1.5.980-00 (radiation dose not less than 40 mJ/cm2). The UV-disinfection station built on the basis of tray-type vertical type equipment manufactured by «LIT» SPA is installed in three concrete flow channels. To improve the energy efficiency of the UV disinfection station operating under the conditions of uneven incoming wastewater flow during the day a system for the UV irradiation rate control by signals from an external flow meter and a tau meter measuring the UV transmittance was retrofitted. Ultraviolet disinfection of effluent does not affect the Ob River. Used for several years UV disinfection of wastewater and up to now is the best available technology.

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№5|2017

DRINKING WATER SUPPLY

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UDC 628.166.094.3

FESENKO L. N., Skryabin A. Yu., Breus S. A., Pchel'nikov I. V.

Field tests of drinking water disinfection by direct electrolysis

Summary

The results of studying direct electrolysis of natural underground water with the purpose of determining possible production of low concentration sodium hypochlorite for drinking water disinfection before supplying it to the residents of Grushevskaia village of the Aksaisk District, Rostov Area are presented. The use of natural surface or underground water as electrolyte provides for eliminating the stage of artificial chloride solution making; that will simplify the technology of disinfectant production at the point of application and reduce the operation expenses. The studies were carried out in a full-scale plant in two directions: determination of the optimal parameters of the flow-through electrolyzer; determination of the lifetime of electrodes. The results of the full-scale studies confirmed possible disinfection of chloride-containing natural water (chloride concentrations 200–233 mg/dm3) by direct electrolysis. The process parameters of the electrolyzer operation with underground fresh water were determined: current density; water flow to the elect­rolyzer (flow rate); the time of electrode operation as an anode and as a cathode. The optimal composition of electrode coating was determined: in ruthenium –iridium oxide coating the weight ratio of Ru to Ir was 20:80. The use of iridium in the coating effects the formation of active chlorine and the electrode lifetime. The presence of ruthenium in the oxide layer in 20:80 weight ratio to iridium increases the anode lifetime tenfold (up to 4000 hours) compared to the anode without iridium.

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№5|2013

WATER AND WASTEWATER COMPANIES (VODOKANALS) IN RUSSIA

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UDC 628.35

Yavtoushenko M. V., Tarasova O. V., Rouzayev V. I., Belyaeva S. D., Bibyaev A. V., Belyaev M. A.

Commissioning the upgraded biological treatment plant at the Podolsk wastewater treatment facilities

Summary

The results of commissioning the upgraded biological treatment plant at the Podolsk wastewater treatment facilities are presented. The start up of the basic equipment, mixers and recycle pumps installed in anaerobic and anoxic zones; the secondary settler equipment; the new Korean NEUROS NХ-300 air blowers was carried out. The tertiary treatment unit washing regime during commissioning was defined. Commissioning of the UV-disinfection plant was carried out. The operational parameters of the treatment facilities were monitored by the automatic analyzers and sensors data; the laboratory control was carried out as well. Exceeding the incoming wastewater flow compared to the design value was noted; exceeding suspended solids and phosphate concentrations in the incoming wastewater was registered. However, despite the excess of the incoming wastewater flow and increased concentration of pollutants, the treatment facilities ensure advanced elimination of organic matter and nutrients.

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