Research Abstracts

A method to determine the critical concentration Rayleigh number in isothermal membrane transport processes was worked out. This method is based on equations which include the diffusive permeability coefficient, Tks; solution parameters (density, D; kinematic viscosity, <; diffusion coefficient, Dks

The aim of this work is to improve a mathematical model to describe the volume-decreasing diafiltration process by including macrosolute rejection. Water consumption in this continuous process was analyzed and a significant advantage when comparing both the classical diafiltration process and multi-

Within the lifetime of most membranes some fouling will adversely affect membrane performance and cleaning will be necessary. The cleaning will depend on the type of deposit such as organic fouling, inorganic scaling or colloidal deposition. However strong the circumstantial evidence as to the ident

Two hollow-fibre ultrafiltration membrane modules of the waste-water treatment facilities of a cosmetics company were analysed to investigate the causes of membrane damage and rapid fouling of the membranes. This autopsy consisted of visual inspection of the membranes and the module, a bubble-point

Described herein is a case study of long-term reverse osmosis plant operation based on TFC membrane technology developed by CSMCRI, Bhavnagar, India. The plant supplies safe drinking water containing 175 ppm to the population of the Kasari village. The plant provides 2000 L/h desalinated water conta

Southern Tunisian’s natural brines represent an important source of mineral salts with a high economic value. These salts are recoverable by simple solar evaporation. Indeed, during isothermal solar evaporation it is possible to recover mineral salts and to determine the precipitation sequences of t

A hybrid process, consisting of ozonation and membrane filtration, followed by activated carbon filtration, was studied in pilot scale for drinking water production from river water. The main focus of this study centred on tests to determine the effect of ozone on the filtration and fouling behaviou

One of the largest seawater reverse osmosis (SWRO) desalination plants in the world commissioned at Addur, Kingdom of Bahrain survived the numerous obstacles that brought down the plant’s production capacity to its lowest level. The drastic production loss, ever increasing heavy chemical cleaning pr

2 The crystallization of K2SO4 in the system K+, Mg2+/Cl!, SO4 / H2O involving the reaction 2KCl + MgSO4 K2SO4 + 2KCl was studied. Independently of the experimental procedure applied, it was confirmed that schoenite (K2SO4.MgSO4.6H2O) is an inevitable intermediate product of the considered transform

The seawater extracted from a depth of 30 m has a constant temperature of about 18°C. This water can be used as cold source for the conditioning of Salammbô Museum aquariums (Tunisia). With this intention a passive system, using capillary polypropylene exchangers, is carried out. The tests show that