Research Abstracts

2021 - 2030 of 3156 results

Silica removal using ion-exchange resins"a*M. Ben Sik Ali a, B. Hamrounl , S. Bouguecha b, M. Dhahbi b°Laboratoire Eau et Technologies Membranaires, FacultO des Sciences de Tunis, In water treatment, silica is a problem because of its tendency to form deposits. It is often necessary to include reducing silica concentration to permit increased cycles of concentration without scale. The behavior of aqueous silica and the various water treatment processes used for its removal we Desalination 167 (2004)
Salt: rejection in nanofiltration for single and binary salt mixtures in view of sulphate removal Three commercial membranes (NF70, NF90 and TFC-SR) were firstly characterized in terms of pure water flux and the: rejection of uncharged (alcohols and sugars) compounds. Subsequently, the rejection of monovalent (sodium and chloride) and divalent (calcium and sulphate) ions in single (NaC1, CaC12an Desalination 171 (2004)
SCALE2000: reaction-transport software dedicated to thermokinetic prediction and quantification of scalesApplicability to desalination problems Mineral scaling prediction in industrial processes involving high salinity solutions at high temperatures remains notoriously intricate, due particularly to difficulties incurred by modelling the thermodynamic and kinetic behaviour of the mineral deposits in such systems. In addition to these comple Desalination 165 (2004)
Potential use of nanofiltration membranes in treatment of industrial wastewater from Ni-P electroless plating Nanofiltration (NF) membranes are a relatively new class of membranes which have properties in between those ofultrafiltration (UF) membranes and reverse-osmosis (RO) ones. Their separation mechanisms involve both steric (sieving) effects and electrical (Donnan) effects. The significance of this mem Desalination 168 (2004)
Nonlinear, coupled mass transfer through a dense membrane Concentration and/or space-dependent diffusional mass transport through a dense membrane were investigated. A quasi-analytical approach is given in order to calculate the concentration distribution in the membrane and the mass transfer rates in the case of a single component as well as of binary com Desalination 163 (2004)
Modeling of crossflow membrane separation processes under laminar flow conditions in tubular membrane One of the major problems associated with membrane separation processes, which restricts the widespread application of this process in the industry is the decline in flux. This occurs due to the build up of the solute concentration near the membrane surface, which is defined as concentration polaris Desalination 168 (2004)
Laboratory RO and NF processes fouling investigation by residence time distribution curves examination The fouling phenomena of nanofiltration of calcium sulfate saturated feed solution in the presence of magnesium and carbonates as well as the reverse osmosis of saturated silica feedwater with magnesium chloride content at different pH levels, was investigated by analyzing the membrane residence tim Desalination 164 (2004)
Andrzej $1~zaka, Jacek W~Isikb, Komelia ~l~zak a aDepartment of Biomedical Fundamentals of Sport, Cz~stochowa Universi(y of Technology, A mechanical pressure model equations for a double-membrane system, in which a series of two (M 1 and Mr) vertically mounted, fiat, symmetric, polymer membranes separate three compartments (1, m, r) containing the heterogeneous non-electrolyte solutions of concentrations C k , C k and C k was develo Desalination 168 (2004)
Solar assisted heat pump desalination system This paper describes a novel system of solar assisted heat pump desalination. A single effect desalination unit has been designed and fabricated, and it is connected to an existing solar assisted heat pump. The system consists of a compressor, condenser, evaporator, solar evaporator-collector, desal Desalination 168 (2004)
Early discovery of RO membrane fouling and real-time monitoring of plant performance for optimizing cost of water RO plant operators, end-users, membrane manufacturers and system suppliers have been facing two major problems since the advent of commercial membrane technology applications for water desalination utilizing reverse osmosis (RO) and other membrane processes: how to reliably monitor their membrane sy Desalination 165 (2004)

Silica removal using ion-exchange resins"a*M. Ben Sik Ali a, B. Hamrounl , S. Bouguecha b, M. Dhahbi b°Laboratoire Eau et Technologies Membranaires, FacultO des Sciences de Tunis,

In water treatment, silica is a problem because of its tendency to form deposits. It is often necessary to include reducing silica concentration to permit increased cycles of concentration without scale. The behavior of aqueous silica and the various water treatment processes used for its removal we

Desalination 167 (2004)

Salt: rejection in nanofiltration for single and binary salt mixtures in view of sulphate removal

Three commercial membranes (NF70, NF90 and TFC-SR) were firstly characterized in terms of pure water flux and the: rejection of uncharged (alcohols and sugars) compounds. Subsequently, the rejection of monovalent (sodium and chloride) and divalent (calcium and sulphate) ions in single (NaC1, CaC12an

Desalination 171 (2004)

SCALE2000: reaction-transport software dedicated to thermokinetic prediction and quantification of scalesApplicability to desalination problems

Mineral scaling prediction in industrial processes involving high salinity solutions at high temperatures remains notoriously intricate, due particularly to difficulties incurred by modelling the thermodynamic and kinetic behaviour of the mineral deposits in such systems. In addition to these comple

Desalination 165 (2004)

Potential use of nanofiltration membranes in treatment of industrial wastewater from Ni-P electroless plating

Nanofiltration (NF) membranes are a relatively new class of membranes which have properties in between those ofultrafiltration (UF) membranes and reverse-osmosis (RO) ones. Their separation mechanisms involve both steric (sieving) effects and electrical (Donnan) effects. The significance of this mem

Desalination 168 (2004)

Nonlinear, coupled mass transfer through a dense membrane

Concentration and/or space-dependent diffusional mass transport through a dense membrane were investigated. A quasi-analytical approach is given in order to calculate the concentration distribution in the membrane and the mass transfer rates in the case of a single component as well as of binary com

Desalination 163 (2004)

Modeling of crossflow membrane separation processes under laminar flow conditions in tubular membrane

One of the major problems associated with membrane separation processes, which restricts the widespread application of this process in the industry is the decline in flux. This occurs due to the build up of the solute concentration near the membrane surface, which is defined as concentration polaris

Desalination 168 (2004)

Laboratory RO and NF processes fouling investigation by residence time distribution curves examination

The fouling phenomena of nanofiltration of calcium sulfate saturated feed solution in the presence of magnesium and carbonates as well as the reverse osmosis of saturated silica feedwater with magnesium chloride content at different pH levels, was investigated by analyzing the membrane residence tim

Desalination 164 (2004)

Andrzej $1~zaka, Jacek W~Isikb, Komelia ~l~zak a aDepartment of Biomedical Fundamentals of Sport, Cz~stochowa Universi(y of Technology,

A mechanical pressure model equations for a double-membrane system, in which a series of two (M 1 and Mr) vertically mounted, fiat, symmetric, polymer membranes separate three compartments (1, m, r) containing the heterogeneous non-electrolyte solutions of concentrations C k , C k and C k was develo

Desalination 168 (2004)

Solar assisted heat pump desalination system

This paper describes a novel system of solar assisted heat pump desalination. A single effect desalination unit has been designed and fabricated, and it is connected to an existing solar assisted heat pump. The system consists of a compressor, condenser, evaporator, solar evaporator-collector, desal

Desalination 168 (2004)

Early discovery of RO membrane fouling and real-time monitoring of plant performance for optimizing cost of water

RO plant operators, end-users, membrane manufacturers and system suppliers have been facing two major problems since the advent of commercial membrane technology applications for water desalination utilizing reverse osmosis (RO) and other membrane processes: how to reliably monitor their membrane sy

Desalination 165 (2004)

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