Water and water purification technologies

Scientific and technical news

REMOVING OF SUBSTANCES THAT INFLUENCE THE HORMONAL SYSTEM OF LIVING ORGANISMS FROM THE WASTE WATERS USING TRADITIONAL WATER-TREATMENT METHODS

R. Mesarosh1, S. Barany1, 2

1 – University of Miskolc, Institute of Сhemistry, 3515 Miskolc-Egyetemváros, Hungary

2 – Ferenc Rákóczi II Transcarpathian Hungarian Institute,Beregovo,Ukraine

e-mail: sbarany@uni-miskolc.hu

The article obtains a broad literature review on issue of drinking and industrial waste waters treatment. Substances that strongly impact on the hormonal system of living organisms (Endocrine Disrupting Compounds or EDC-type substances) are mostly in a focus. Composition/structure of the most typical substances, affecting hormonal balance of man and their classification are given. The paths of getting the indicated matters into environment are described. The short analysis of difficulties of analytical determination of EDC-substances are given. The basic methods of this kind pollutants removing from different types of water are critically considered: coagulation, adsorption on activated carbon, oxidization, biological and membrane methods, ozone and chlorine. The article contains 25 references.

Keywords: substances, hormonal system, living organisms, composition and classification, sewages, treatment, coagulation, adsorption, activated carbon, destruction, ozone, chlorine, biological treatment, membrane methods. 

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19.07.2013 at 3:22 pm

PHYSICO-CHEMICAL THEORY OF THE COAGULATION WATER TREATMENT. THE INFLUENCE OF VARIOUS FACTORS ON THE PROCESS (REPORT 2)

A.K. Zapolski
Zhitomirsky national agro-economic university, Zhitomir, Ukraine
e-mail: tnrtazht@xtf.kpi.ua

From the standpoint of a new physical-chemical water treatment coagulation theory, proposed by the author, the theoretical basis of the hydrolysis of coagulants and coagulation process of pollutants of natural waters to produce potable water condition.

The influence of temperature, pH, ionic composition, mixing, additives and opacifiers flocculants on the process of coagulation. Analyzed the different ways of feeding coagulants to purify water. Particular attention is paid to the contact coagulation, which allows to intensify the process of drinking water, reducing reagent consumption and improve the quality of treated water.

Key words: coagulation, aluminum sulfate, akvakompleksy, aluminum hydroxide, ion composition, contact coagulation.

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19.11.2012 at 3:36 pm

PHYSICO-CHEMICAL THEORY OF CLEANING WATER ALUMINUM SULFATE KOAHULYUVANNYAM (POST 1)

A. Zapolzkiy

Zhitomir National Agroecomomic University, Zhitomir

e-mail: tnrtazht@xtf.kpi.ua

The authors suggest a new physical-chemical theory of water treatment coagulants (eg aluminum sulfate). For the first time expressed the opinion that the hydrated aluminum ion in the solid crystalline sulphate (Al2(SO4)3*24H2O) is in the form of dimer [Al2(H2O)24]6+. Last ochyschayemiy water in the presence of sufficient alkaline reserve undergo hydrolytic polymerization of the scheme:

[Al2(H2O)24]6+ → [Al2(H2O)24(OH)2]4+ → [Al4(H2O)36(OH)6]6+

→ [Al6(H2O)36(OH)12]6+ → { [Al2(OH)6]3 [Al6(H2O)36(OH)12]2}6+micelles
aggregation of micelles in Globular aggregates and chain structure → flakes.

Key words: coagulation, aluminium sulfate, aqua systems, aluminium hydroxide.

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06.07.2012 at 12:57 pm

MAIN POSSIBILITIES OF IMPROVEMENT OF HUMIC SUBSTANCES REMOVAL BY ULTRAFILTRATION

Т. Mitchenko, О. Svietlieisha

National Technical University of Ukraine “KPI”, Kiev, Ukraine

e – mail: aves_@rambler.ru

Ultrafiltration becomes more popular in drinking and wastewater treatment today. It used individually or as a pretreatment for reverse osmosis. Practical experience has shown a high efficiency of suspended particles and microbial contamination removal with ultrafiltration method, in contrast to the removal of organic substances that is usually below the stated. It is an essential problem for water treatment of rivers of Dnieper basin. Their main characteristic and problem as well is high content of humic substances (HS) (5-16 mgO2/l). Water with high level of HS is unfit for using in manufacturing processes and for drinking purposes without any treatment. It has shown that membrane surface modification and combination of physical-chemical methods with ultrafiltration can increase the efficacy of HS removal and reduce their negative impact on the membrane surface.

Keywords: coagulation, oxidation, ultrafiltration, humic compounds, modification of membrane surface.

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17.02.2012 at 1:35 pm

CLEARING OF SMALL-SCALE TURBID COLOURED WATERS ON THE CONTACT AND BIOCLARIFYING FILTERS

V. Orlov, A. Orlova , H. Turovska

National university of water industry and nature management, Rivne, Ukraine

e-mail: Orlov_Valeriy@list.ru

Theoretical substantiation and the results of studies on lightening and discoloration of natural small-scale turbid and non-ferrous water on the contact bioclarifying filters.

Key words: contact filtering, coagulation, biological treatment, bioabsorber, carriers of biocenosis.

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17.02.2012 at 1:14 pm

PILOT TEST OF HUMIC COMPOUNDS REMOVAL FROM DNIPER RIVER WATER BY COAGULATION – ULTRAFILTRATION

O. Svietlieisha1, T. Mitchenko1, I. Astrelin1, A. Lazarev1, P. Stender2, P. Kozlov2

1 – National technical university of Ukraine “KPI”, Kiev;  2- Co Ltd SPA “Ecosoft”, Irpin, Ukraine

e-mail: aves_@rambler.ru

Combined coagulation – ultrafiltration technology of Dniper river water treatment was investigated in this study. High humic compounds content, that typical for Dniper river water, can essentially decrease efficiency of water pretreatment as by traditional technologies so by an ultrafiltration. Performed investigations showed that in-line dosing of coagulant before ultrafiltration stage can increase efficiency of color and permanganate oxidation removal.

Key words: coagulation, ultrafiltration, humic compounds, aluminium oxychloride.

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21.08.2011 at 7:21 pm

STABILIZING OF THE WATER DISPERSIBLE SYSTEMS

V. Yu. Tretinik, V. A. Yaremenko, T. V. Sira

A.V.Dumanskii Institute of Colloid and Water Chemistry National Academy of Science of Ukraine, Kiev, Ukraine

e-mail: buttya@mail.ru

 

Questions are considered on the mechanism of stabilizing of the natural dispersible systems at treatment surface-active substance (SAS) and high molecular compounds. Pictures are developed of primary influence structurally – mechanical factor in the processes of stabilizing of silica-alumina water dispersions. Distinctions are certain in kinetics of adsorption of macromols of carboxymethylcellulose (СМС), oxiethylcellulose (OEC), carboxyl methyl oxy cellulose (CMOEC) from water solutions on montmorillonite, exposing nature of adsorption co-operation. The features of stabilizing of silicate suspensions are rotined low-molecular (SAS) polymers. At the persorption of low-molecular SAS there is forming of monolayer round the particles of dispersible phase and polimolekulyarnaya adsorption shows up. As compared to them the persorption of macromols is insignificant and carried out as segments. On results the conducted researches Patent of Ukraine is got. The compositions are steady to salt and temperature of borings liquids was developed on the basis of CMC and its derivatives tested at experimental-industrial areas PA «Ukrneft’» and PA «Turkmengazprom».

Key words: water dispersible systems, surface-active substance (SAS), water-soluble polymers, carboxymethylcellulose (СМС), oxiethylcellulose (OEC), carboxyl methyl oxy cellulose (CMOEC), structurally – mechanical properties, kinetics of adsorption, coagulation.

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28.11.2010 at 10:25 pm