Water and water purification technologies

Scientific and technical news

COMPARATIVE ASSESSMENT OF SORPTION PROPERTIES OF COMMERCIALLY AVAILABLE AND EXPERIMENTAL HYBRID MATERIALS AIMED TO IMPURITIES OF As (III) AND As (V) IN WATER

 

Z. Maletskyi, T. Mitchenko, N. Makarova, H. Shevchuk, E. Kolomiets

National Technical University of Ukraine “KPI”,Kiev

e-mail: mail@zahar.info

A comparative study of the sorption properties of commercially available and experimental hybrid sorbents with respect to dissolved arsenite and arsenate ions has been caried out in the present work.

It has been ascertained that the main factor influencing the sorption capacity with respect to arsenic is the iron content in the sorbent phase. Hybrid sorbents based on waste anion exchange resin and iron compounds acquire ability to remove both valence forms of arsenic from water.

The results shown that degree of water purification with hybrid sorbents corresponds to the degree of purification with commercially available materials. At the same time economic performance of the hybrid sorbents is 2-2.5 times higher than the industrial materials.

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13.08.2013 at 1:51 pm

CRUSTACEANS AS BIOMARKERS OF POLLUTION IN THE BLACK SEA WITH HEAVY METALS EXPOSURE TO HEAVY METALS

Andrusishin2,3, V. Zagoryi3 I. Andrusishina1

1 – Institute for Occupational Health of the AMS of Ukraine

2 – Small Academy of Science Student in Kiyv

3 – Specialized secondary school № 197 im.D.Lutsenka

e-mail: irina_andrei@voliacable.com

 

Benthic fauna (zoo benthos) of subpralitoral Black Sea is extremely abundant and diverse. Especially were numerous mollusks and crustaceans. Last play an important role in cleaning up coastal zone, and therefore were chosen as test object. The study conducted on crustaceans and as a comparison to sea water, seaweed and mollusks of the Black Sea revealed an uneven accumulation of heavy metals in aquatic water due to their location in the food chain.

The data obtained show that the species of Decapoda (Callinoctes sapidea) and Isopoda (Sphaeroma Serratum) are able to accumulate heavy metals intensively other taxonomic groups of marine aquatic organisms that may be the result of their adaptation to living in polluted conditions of the environment. The sensitivity of crustaceans such as Sphaeroma serratum to heavy metals makes it possible to use the latter as bioindicators of pollution in border areas of land and sea coast of the Crimea.

Key words: heavy metals, biomarkers, crustaceas supralittoral.

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06.07.2012 at 1:15 pm

SAFETY OF APPLICATION OF POLIVINILHLORID PIPELINES FOR THE CONTACT WITH A DRINKING-WATER

S. Kataeva

Institute of Post-Diploma Training, Kiev

National University of Food Technologies, Kiev

e-mail: lana@ipdo.kiev.ua

 

Large-size plastic products are required to be held in tap water for up to 3 days before the first use. Basing on experimental data, we have developed algorithms to predict the regulations for usage of polymeric materials and products in domestic water supply.

Keywords: plastic products, domestic water supply, polymeric materials.

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06.07.2012 at 1:12 pm

CALCULATION OF SUCKS AIR SYSTEMS IN THE PLANT FOR FORREMOVING IRON FROM WATER

T. Khomutetska, P. Khoruzhiy, O. Ruban

Institute of Water Problems and Land Reclamation, Kiev

e-mail: itsk@bigmir.net

The paper considers the factors affecting the efficiency of iron removal from groundwater, described construction of a suction air system in the plant for removing iron from water and shows the method of its calculation.

Key words: removal of iron from the water, lifting unit, suction air, ejector, the piezometric pressure.

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06.07.2012 at 1:08 pm

CURRENT TECHNOLOGY FOR WASTER WATERS SLUDGE TREATMENT AND REDUCTION

L. Dolina

Dnepropetrovsk National Technical University of Railway Transport, Dnepropetrovsk

e-mail: tatjana.gajun@gmail.com

This article describes one of the modern technologies for processing and reduction of sewage sludge. Sludge in wastewater treatment plants (raw and excess activated sludge, etc.) should be treated, providing opportunity to its disposal or storage and to minimize its impact on the environment. The proposed method of reducing the sediment, namely activated sludge (which provides a decrease of 40-80%) can be embedded directly into the technology of sewage treatment, rather than in processing precipitation, which is very important and promising process.

Key words surplus sludge, treated waste water, ozonizer,disinfection,concentration, toxic substances, microorganisms.

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06.07.2012 at 1:05 pm

KINETICS STUDY OF IRON HYDROXIDE CARRY BY LOADING POLYSTYRENE FILTERS

V. Orlov, S. Martynov, S. Kunitsky, M. Meddur

National university of water management and nature resources use, Rivne

e-mail: Orlov_Valeriy@list.ru

The results of the implementation of technological schemes deferrization of polystyrene filters are presented. The processes of washing polystyrene filling in laboratory and production conditions are studied. Influence on the process of cleaning different types of lower distribution systems is presented.  Shows the kinetics of leaching of contaminants from the load and determined the duration of flushing.

Keywords: deferrization, washing filters, polystyrene filters, distribution system, the kinetics of leaching of contaminants.

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06.07.2012 at 1:01 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

USE OF DIFFERENT KIND BIOCIDES IN WATERTREATMENT

M. Sus, T. Mitchenko

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

e-mail: msus87@gmail.com

An overview and classification of up-to-date biocidal reagents for different purpose water disinfection are given. The action spectrum, mode of action, features, advantages and disadvantages of each of biocide are considered. The list of most known manufacturers and suppliers of biocides for water treatment is presented.

Key words: biocides, oxidizing, non-oxidizing, mode of action, microorganisms.

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17.02.2012 at 1:37 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

THE COMBINED METHODS OF PURIFICATION AND WATER DISINFECTING. THE MESSAGE THE FOURTH: THE COMBINED APPLICATION OF CHLORINE DIOXIDE AND CHLORINE

N. Petrenko,  A. Mokienko

State Enterprise “Ukrainian Research Institute for Medicine of Transport” of Ukrainian  Ministry of Public Health, Odessa, Ukraine

e-mail: natand@normaplus.com

The data of the literature and results of own researches on the combined application of chlorine dioxide and chlorine at purification and disinfecting of drinking water are presented. The optimality of the following technological scheme  is proved: oxidation of river water by chlorine dioxide, coagulation,  filtration, disinfecting by chlorine.

Keywords: water, oxidation, disinfecting, chlorine dioxide, chlorine, combination.

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17.02.2012 at 1:32 pm

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