Electrodialysis

The chloride concentration of a hazardous leachate of approximately 22,000 mg/l is too high for the direct discharge requirement of less than 1000 mg/l into the municipal sewerage system. Electrodialysis (ED) was selected amongst various other alternative technologies for the desalination/concentrat

Nitrate content has increased in Morocco, especially in underground water of agrarian areas. Several processes including degradation processes and separation processes can remove nitrate from water. Two separating processes were studied to remove nitrate from brackish underground water: adsorption o

The transport of zinc complexes ions through an anion exchange membrane was evaluated by the treatment of solutions with and without cyanide. The ionic transport was analyzed as a function of the applied current density and of the cyanide and hydroxyl concentration. Experimental results showed that

Most widely applied and commercially proven desalination technologies fall into two categories of thermal (evaporative) and membrane based methods. Membrane methods are less energy intensive than thermal methods and since energy consumption directly affects the cost-effectiveness and feasibility of

Boron removal from aqueous solution by electrodialysis was studied as a function of solution pH, applied voltage, flow rate and initial boron concentration. TS-l-l0 electrodialysis equipment (Tokuyama) modified with rotameters was employed for experimental studies. It was obtained that the highest b

The electrodialytic removal of boron from seawater reverse osmosis permeate was examined in laboratory. Two model SWRO permeates were investigated. The composition of the first one (TDS 604 mg/L, B content 2.25 mg/L) was calculated using ROSA 6.0 software (DOW Chem.) assuming SW30HR-320 membrane, oc

Both pressure driven and electro-membrane processes show better boron removal efficiency when carried under alkaline conditions when the boric acid is ionized to a large extent. Even under such conditions the electrodialysis (ED) performance is, however, reported to be poor since low boron current e

Presently boron-rich chemical landfill leachate originating from Tarnowskie Góry is being treated by boronselective ion-exchange resin. Since the boron concentration in this feed water type is relatively high (approx. 70 mg of B/L), the IE column post-regeneration lyes, that are strongly acidic and

Three types of electrodialysis (ED) and electrodeionization (EDI) stacks are studied when treating NaCl solutions in the range of concentrations from 10−5 to 3 × 10−2 M: (1) with a non-conducting network spacer, (2) with a mixed ion-exchange monolayer bed, (3) with profiled membranes. The Sherwood n

Polymer-flooding process is one of tertiary oil extraction technologies. It has stepped into industrialization application period in Daqing Oilfield (China) in recent years. It plays an increasingly important role in the oil exploitation, but around 60 million ton polymer-flooding wastewater is prod