Research Abstracts

The simultaneous recovery of trivalent and tetravalent chromium ions through charged ion-exchange membranes by using three detachable cells was tested at different current densities. The effect of mono- and divalent valence ions corresponding to trivalent and hexavalent chromium ions in the feed pha

A brackish water desalination plant in California that incorporates RO, NF, and EDR units was analyzed thermodynamically using actual plant operation data. Exergy flow rates were evaluated throughout the plant, and the exergy flow diagrams were prepared. The rates of exergy destruction and their per

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 (NaCl, CaCl2 an

An electrodialysis process was employed to investigate the concentration of formic, acetic and propionic acid solutions under different experimental conditions. In this process interpolymer-type ion-exchange membranes were used due their high chemical stability and durability. The effects of concent

The photocatalytic degradation of an azo dye derivative, chrysoidine Y (1), was investigated in aqueous suspensions of titanium dioxide and zinc oxide by monitoring the change in substrate concentration employing UV spectroscopic analysis and decrease in total organic carbon content as a function of

For a specific textile finishing company strategies for water recycling and recovery of valuable chemicals have been developed. A comprehensive study of the company’s resource consumption and emission profile was performed. On this basis selected end of the pipe and integrated recycling options were

On a uniformly sloping beach, high salinity build-up along the coast associated with brine discharge into the sea can be avoided by building a longer outfall. For an existing seawater desalination plant, extending the outfall will affect the design specification of the plant. Using a two-dimensional

The electrical potential difference at both sides of a membrane when it is separating two solutions of the same electrolyte but different concentrations is called “membrane potential”. It is an important tool to study the electrical character and the construction of charged membranes. The Teorell–Me

A theoretical investigation of particle deposition onto a permeable surface of a tubular membrane is presented. The mass transport mechanisms are mathematically expressed using the two-dimensional convective diffusion equation. A numerical scheme is presented to solve the two-dimensional convective

The paper presents results of a study investigating softening by nanofiltration of the Hamma underground water resource. The Hamma wells supply the City of Constantine with hard drinking water containing calcium bicarbonate. The main parameters investigated were pressure, cross-flow velocity and wat