Abstract
The membranes and membrane processes have succeeded in the transition from major technological and biomedical applications to domestic applications: water recycling in washing machines, recycling of used cooking oil, recovery of gasoline vapors in the pumping stations or enrichment of air with oxygen. In this paper, the neutralization of condensation water and the retention of aluminum from thermal power plants is studied using ethylene propylene diene monomer sulfonated (EPDM-S) membranes containing magnetic particles impregnated in a microporous propylene hollow fiber (I-PPM) matrix. The obtained membranes were characterized from the morphological and structural points of view, using scanning electron microscopy (SEM), high resolution SEM (HR-SEM), energy dispersive spectroscopy analysis (EDAX) and thermal gravimetric analyzer. The process performances (flow, selectivity) were studied using a variable magnetic field generated by electric coils. The results show the possibility of correcting the pH and removing aluminum ions from the condensation water of heating plants, during a winter period, without the intervention of any operator for the maintenance of the process. The pH was raised from an acidic one (2–4), to a slightly basic one (8–8.5), and the concentration of aluminum ions was lowered to the level allowed for discharge. Magnetic convection of the permeation module improves the pH correction process, but especially prevents the deposition of aluminum hydroxide on hollow fibers membranes.
Highlights
This paper addresses the correction of pH and the elimination of aluminum ions from condensation waters with a membrane system based on a microporous membrane polypropylene hollow fiber (PPM), impregnated with ethylene propylene diene monomer sulfonate (EPDM-S) and magnetic particles, operated in variable magnetic field
The impregnated membranes used in this paper have the following three elements: polypropylene hollow fiber, magnetic nanoparticles and ethylene propylene diene monomer sulphonate
In this paper we have presented the results of the pH correction and the retention of aluminum ions from the condensate of medium power heating plants
Summary
The first is a large-scale and highimpact technological application referring to obtaining drinking water by the desalination of sea water [3,4], and the second is an exceptional biomedical achievement: the artificial kidney [5,6] (Figure 1). Starting from these landmarks, membranes and membrane processes have succeeded due to flow performance, low costs with chemical reagents and the easy scaling up the of the unpleasant smell of the premises [18,19,20,21,22]. All of the applications presented are based on an extraordinary diversification of membranes, which are based on the special development of polymeric, oxide, metallic and composite materials, but especially on the appearance of nanometric shapes of with pre determined dimensions and properties [23,24,25,26]
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