Water and water purification technologies

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EXPERIENCE OF THE APPLICATION OF ISD IN ORDER TO INCREASE CAPACITY OF THE TWO-STAGE REVERSE OSMOSIS PLANT

P. Stender1, V. Polyakov1, P. Kozlov1, T. Odinokih2

1 –  SPC “ Ecosoft”, 2- PC “Concern Stirol”, Ukraine

e-mail: pstender@voda.com.ua

Theoretical and practical aspects application of internally staged design (ISD) application are considered. ISD is based on the usage of the different types of membrane elements in one pressure vessel when designing of the multi-stage reverse osmosis plants. The experience of such an approach when replacing of 144 elements in the actual RO plant is described. Several designs based on use of various combinations of the RO elements where carried out.

Described experience acknowledges an efficiency of the ISD approach. Significant increase of double-stage RO plant’s capacity and operational costs savings are proven in practice on the stipulation of acceptable  permeate quality.

Key words: reverse osmosis, membrane elements, internally staged design (ISD), permeate, selectivity.

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28.09.2010 at 12:57 pm

THE INCREASING OF THE EXPLORATION OF HME APSON THE BASIS OF THE FORMATION THE AUTOMATIC, EXPERT AND LABORATORY INTEGRATED CONTROL SYSTEM OF THEIR WATER CHEMICALMODE WITH THE ABILITY TO PROGNOSE THE FURTHER DEVELOPMENTS

M. Smalko 1, I. Dobrovolskaya 2, V. Michailovskii 1

1 – “Envitek Ltd.” Co., 2 – SU “Zaporizhska NNP” of the government enterprise of national energy generating company “Energoatom”, Energodar, Ukraine

e-mail: vrhl3048@mgw.npp.zp.ua

The results of increasing of the exploitation efficiency of atomic power station (APS) with reactor VVER on the basis of formation the automatic and laboratory integrated control system of water-chemical mode (WMC) are represented. The creation of such system will enable to make a operative decision for optimization of WCM operating. In addition, it becomes possible to support such physical and chemical characteristics of heat carriers which would prevent the corrosive damage of structural materials of HME and formation of scale on their floors, the same improving safety and efficiency of facilities operation of APS.

Key words:  water-chemical mode, integrated control system, corrosion damages.

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28.09.2010 at 12:55 pm

REMOVING FLUORINE FROM WATER BY TITANIUM AND ALUMINIUM COAGULANTS

A.V.Mamchenko, N.G.Gerasimenko, T.A.Pahar

Institute of Colloid and Water Chemistry,

NationalAcademy of Sciences of Ukraine, Kiev, Ukraine

e-mail: n_gera_56@ukr.net

Comparative effectiveness of  titanilsulphate, aluminiumsulphate (AS), based sulphate (BSA 2,0 ) and based chloride (5/6 BCA) of aluminium depending on pH (8,0 – 6,3) and alkalinity (5,0 – 2,0 mmol/L) under removing fluorine from water has been studied. The fulfilled researches indicate about the higher effectiveness of BSA 2,0 and 5/6 BCA in  comparison with SA under removing fluorine as well as special aimed decreasing pH and alkalinity that provide the decreasing of reagent expenditures and the obtaining water of necessary qualities. It is shown that the using of titanilsulphateunder fluorine removing is perspectiveless.

Key words: defluorination of water, coagulants, pH, decreasing of reagent expenditures.

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28.09.2010 at 12:51 pm

PHYSICOCHEMICAL BASES OF THE REMOVAL PROCESS OF BIOCIDAL REAGENT ON BASIS OF POLYHEXAMETHYLENEGUANIDINE FROM THE WATER WITH THE USE OF WEAK ACID CATION EXCHANGE RESIN

M. Sus, T. Mitchenko, N. Makarova,

National technical university of Ukraine “KPI”, Kiev, Ukraine

е-mail: msus87@gmail.com

The paper deals with the investigation of polyhexamethyleneguanidine (PGMG) and weak acid cation exchange resin interaction mechanism. In addition, to organize efficient posses of PHMG excess removal from the water it was very important to find out the character of different factors influence on the sorption of PHMG by chosen resin.

The ion exchange mechanism of PHMG and cation exchange resin interaction was established. Besides, it has shown that efficiency of PGMG sorption depends on the resin ionic form and ionic composition of water.

Key words: PHMG, weak acid cation exchange resin, interaction mechanism, factors influence, sorption efficiency.

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27.09.2010 at 12:01 am

KINETICS OF CaCO3 CRYSTALLIZATION. QUAZIEQUILIRIBRIUM MODEL

V. Kochmarskii

National University of water industry and environmental management, Rivne, Ukraine

e-mail: as270@nuwm.rv.ua

 

CaCO3 crystallization kinetics from hydrocarbonate systems (HCS) at pH<10 is being investigated. Quaziequiliribrium approximation is used for process modeling with HCS. It has been shown that the state of HCS in such approximation is fully determined by two parameters’: CO2 concentration and pH. Other parameters and their change in time may be calculated by the two factors. Calculations are compared with the experimental data of pCa, pCO2, pCO3 and pH measurements. It has been show that intensive crystallization is an essentially nonequillibrium process and quaziequiliribrium calculations are adequate to experimental data only in the final stage of crystallization.

Key words: crystallization, hydrocarbonate system, quaziequiliribrium model, nonequillibrium process.

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14.09.2010 at 5:25 pm

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