The Efficiency of Water Treatment and Disinfection by Means of Ultraviolet Radiation

1993 ◽  
Vol 27 (3-4) ◽  
pp. 343-346 ◽  
Author(s):  
J. Sobotka
Keyword(s):  
Water Treatment ◽  
Radiation Dose ◽  
Absorption Coefficient ◽  
Uv Radiation ◽  
Radiation Intensity ◽  
Measuring Equipment ◽  
Water Disinfection ◽  
Advantages And Disadvantages ◽  
Disinfection Methods ◽  
Physical Chemical

Advantages and disadvantages of various water disinfection methods are discussed. The report examines the effectiveness of combined chlorine treatment and UV irradiation method of water disinfection and describes methods of determining UV radiation intensity, α absorption coefficient and radiation dose by means of measuring equipment constructed by the author. The α absorption coefficient dependence on the colour and turbidity of water exposed to radiation is defined. Enchytraeus albidus was applied as bioindicator in UV radiation intensity and disinfection effects measurements. The influence of UV radiation on microbiological, physical, chemical, and toxicological properties of water was determined. Prototype devices for water disinfection with UV radiation were made.

Application of Ultraviolet Radiation for Water Disinfection and Purification in Poland

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2313-2316 ◽  
Author(s):  
J. Sobotka
Keyword(s):  
Radiation Dose ◽  
Absorption Coefficient ◽  
Ultraviolet Radiation ◽  
Uv Radiation ◽  
Water Disinfection ◽  
Research Project ◽  
Laboratory Conditions ◽  
Physical Chemical ◽  
Microbiological Properties

A multi-disciplinary research project on water disinfection using UV radiation was carried out under laboratory conditions as well as in selected pools and waterworks. The influence of UV radiation on physical, chemical and microbiological properties of water was determined. The report describes prototype devices and disinfection systems, as well as methods of determining UV radiation dose and α absorption coefficient.

Synthesis, Characterization and Bactericide Properties of Al2O3 Nanoparticles and Al2O3-PAN Membranes for Alternative Water Disinfection Methods

MRS Advances ◽  
2017 ◽  
Vol 2 (30) ◽  
pp. 1605-1610 ◽  
Author(s):  
Abdiel Oquendo-Cruz ◽  
Ana Vega-Avila ◽  
Oscar Perales-Pérez
Keyword(s):  
Water Treatment ◽  
Water Disinfection ◽  
Diffusion Method ◽  
Al2o3 Nanoparticles ◽  
E Coli ◽  
Disinfection Methods ◽  
Removal Capacity ◽  
Bacterial Removal ◽  
Electrospun Membranes ◽  
Ft Ir

ABSTRACTAs the global populations grow, water demand and pollution of water resources will increase. As a consequence, water borne disease outbreaks are on the rise and current disinfection methods have been shown to be ineffective in inactivating all pathogens during water treatment. Aluminum oxide nanoparticles (Al2O3 NPs) have been shown to poses antimicrobial properties. Also, Al2O3 has high thermal and chemical stability, which makes these NPs an excellent candidate for water treatment applications. Thus, the objective of this work is to assess the bactericidal properties of Al2O3 NPs synthesized using a polyol-based process in presence of polyvinylpyrrolidone (PVP). For practical applications nanoparticles must be immobilized in a medium to ensure that particles are not dispersed into the treated water. For this reason, synthesized nanoparticles were dispersed in electrospun polyacrylonitrile (PAN) membranes to also evaluate the bacterial removal capacity. X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR) analysis suggests that synthesized nanoparticles are γ-Al2O3 after annealing at 800°C for 6 hours. Scanning Electron Microscopy (SEM) characterization was used to determine the morphology and size of synthesized nanoparticles. Composite electrospun membranes were also characterized by XRD, FT-IR, and SEM. The bactericide activity of the synthesized γ-Al2O3 NPs and commercially available Al2O3 particles was evaluated by the disc diffusion method against E. coli bacteria. Also, Al2O3-PAN composite electrospun membranes bacterial filtration capacity was tested. Both synthesized and industrially produced particles exhibited antibacterial activity against E. coli, but polyol-based synthesized nanoparticles demonstrated better bactericide properties. The bacterial removal capacity of PAN and PAN/Al2O3 fibers was comparable to that of paper filters.

scholarly journals Insights into Solar Disinfection Enhancements for Drinking Water Treatment Applications

2021 ◽  
Vol 13 (19) ◽  
pp. 10570
Author(s):  
Abdassalam A. Azamzam ◽  
Mohd Rafatullah ◽  
Esam Bashir Yahya ◽  
Mardiana Idayu Ahmad ◽  
Japareng Lalung ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Drinking Water Treatment ◽  
Water Disinfection ◽  
World Health ◽  
Solar Disinfection ◽  
Physical Chemical ◽  
Main Challenge ◽  
Pre Treatment ◽  
Health Organization

Poor access to drinking water, sanitation, and hygiene has always been a major concern and a main challenge facing humanity even in the current century. A third of the global population lacks access to microbiologically safe drinking water, especially in rural and poor areas that lack proper treatment facilities. Solar water disinfection (SODIS) is widely proven by the World Health Organization as an accepted method for inactivating waterborne pathogens. A significant number of studies have recently been conducted regarding its effectiveness and how to overcome its limitations, by using water pretreatment steps either by physical, chemical, and biological factors or the integration of photocatalysis in SODIS processes. This review covers the role of solar disinfection in water treatment applications, going through different water treatment approaches including physical, chemical, and biological, and discusses the inactivation mechanisms of water pathogens including bacteria, viruses, and even protozoa and fungi. The review also addresses the latest advances in different pre-treatment modifications to enhance the treatment performance of the SODIS process in addition to the main limitations and challenges.

scholarly journals ANALYSIS OF TECHNICAL SOLUTIONS FOR SHIP POTABLE WATER SYSTEMS

2020 ◽  
pp. 77-89
Author(s):  
Dmitriy S. Mizgirev ◽  
Nikolay M. Guryanov
Keyword(s):  
Water Treatment ◽  
Potable Water ◽  
Water Systems ◽  
Water Disinfection ◽  
High Quality ◽  
Advantages And Disadvantages ◽  
Complete Purification ◽  
Technical Solutions ◽  
Uv Lamps ◽  
Potable Water Treatment

The article provides an overview and analysis of all main types of potable water systems currently used on inland and mixed navigation vessels: without potable water treatment; with elements of potable water disinfection and conditioning; with complete purification and disinfection of potable water. The operation principles of potable water systems of all types and designs are considered in detail, all the advantages and disadvantages of these systems are noted. Special attention is paid to stations for preparing potable water by using UV lamps, which essentially differ in the technological process from most of the stations used, and provide guaranteed high-quality disinfection of potable water, which allows to choose the most promising station type and outline a plan for further work on creating new and improving existing stations.

Evaluation survey of microbial disinfection methods in UV-LED water treatment systems

2019 ◽  
Vol 659 ◽  
pp. 1415-1427 ◽  
Author(s):  
Xiaoling Li ◽  
Miao Cai ◽  
Lei Wang ◽  
Fanfan Niu ◽  
Daoguo Yang ◽  
...  
Keyword(s):  
Water Treatment ◽  
Disinfection Methods ◽  
Uv Led ◽  
Evaluation Survey

scholarly journals INVESTIGATION OF SOLID PARTICLES UNDER THE ACTION OF AN ACOUSTIC FIELD / SKYSTYJE ESANČIŲ KIETŲJŲ DALELIŲ SĄVEIKOS AKUSTINIAME LAUKE TYRIMAS

2013 ◽  
Vol 5 (6) ◽  
pp. 655-658
Author(s):  
Egidijus Mykolaitis ◽  
Andrius Styra ◽  
Vladas Vekteris
Keyword(s):  
Water Treatment ◽  
Ground Water ◽  
Acoustic Field ◽  
Chemical Industry ◽  
Iron Concentration ◽  
Chemical Processes ◽  
Solid Particles ◽  
Common Elements ◽  
Physical Chemical

Iron is one of the most common elements in ground water. Bythe HN 24:2003 iron concentration in water can‘t be higher than200 μg/l. Water treatment with an acoustic field is a very relevanttopic. Acoustic field is widely used in industrion, medicine,chemical industry and manufacturing. When water is affectedby ultrasound, physical-chemical processes begin. Ultrasoundvibrations lead to dispersion, degasation and coagulation. Ironparticles connect to each other when distance between them istwo times bigger then their own radius. R = 2R. And if thisprocess continues particles connect one by one. In this article teststand and methodics using ultrasonic piezoceramic are shown. Santrauka Geležis – dažniausiai požeminiuose vandenyse aptinkama priemaiša, kuri prastina geriamojo vandens savybes, todėl būtina bendrosios geležies koncentraciją sumažinti iki 0,2 mg/l. Vienas iš geležies šalinimo būdu yra paremtas ultragarso panaudojimu. Straipsnyje glaustai aptarti bendrosios geležies būviai vandenyje, jos šalinimo metodai ir pateikta eksperimentinė metodika. Eksperimentas atliktas naudojant skirtingų dažnių garso bangas nuo 8 kHz iki 20 kHz diapazone. Akustinio lauko daromai įtakai nustatyti, naudojant skirtingų dažnių garso bangas, buvo panaudoti trys skirtingi vandens debitai. Iš gautų rezultatų suformuluotos išvados.

Study of the dynamics of the qualitative indicator of champignons during storage after treatment with UV radiation in the A range

2021 ◽  
pp. 56-57
Author(s):  
Наталья Игоревна Федянина ◽  
Ольга Вячеславовна Карастоянова ◽  
Надежда Вячеславовна Коровкина
Keyword(s):  
Mathematical Model ◽  
Radiation Dose ◽  
Ultraviolet Radiation ◽  
Uv Radiation ◽  
Storage Capacity ◽  
Optimal Processing ◽  
Target Indicator ◽  
Processing Modes

Представлены результаты исследования влияния обработки свежих шампиньонов ультрафиолетовым излучением в диапазоне А различными дозами на изменение текстуры. Построена математическая модель зависимости предельной хранимоспособности по целевому показателю грибов от дозы облучения, и установлены оптимальные режимы обработки. The results of a study of the effect of processing fresh champignons with ultraviolet radiation in the A range with various doses on the change in texture are presented. A mathematical model of the dependence of the limiting storage capacity for the target indicator of mushrooms on the radiation dose has been built and the optimal processing modes have been established.

Equipment and Technology Research of Ballast Water Treatments

2014 ◽  
Vol 998-999 ◽  
pp. 414-417
Author(s):  
Jun Wang
Keyword(s):  
Water Treatment ◽  
Chemical Treatment ◽  
Ballast Water ◽  
Comprehensive Treatment ◽  
Technology Research ◽  
Advantages And Disadvantages ◽  
Marine Environmental Protection ◽  
Ballast Water Treatment ◽  
Water Treatments ◽  
Marine Environmental

Biological invasions caused by Ballast water is always one of the diffcult problems of marine environmental protection, and the technology of ballast water treatment is an effective way to solve biological invasion. This article introduce many equipments of ballast water treatment, introduce physical ballast water treatment, chemical treatment and comprehensive treatment, then describes the advantages and disadvantages of these metheods.

scholarly journals Tablet as a pharmaceutical form of medicinal products intended for administration inside: advantages and disadvantages

2018 ◽  
Vol 16 (3) ◽  
pp. 13-18
Author(s):  
Aleksandr L. Urakov
Keyword(s):  
Chemical Activity ◽  
Review Of The Literature ◽  
Medicinal Products ◽  
Advantages And Disadvantages ◽  
Physical Chemical ◽  
Pharmaceutical Form ◽  
Stomach Ulcers

The review of the literature shows that modern tablets turn drugs into artificial stones with excessively high physical-chemical activity, which can cause caries, stomatitis, gastritis and stomach ulcers. The ways to increase the safety of tablets and their intake is indicated.

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