Alternative methods for dissolved oxygen removal from water: a comparativestudy

Different methods for removing dissolved oxygen from water on the laborator y scale have been studied. They are membrane modules, membrane reactors and ion-exchange columns. The membrane modules and membrane reactors have basi cally a shell and tube type of construction with hollow-fibre polymeric (po lypropylene) membranes acting as the tubes. The main difference in the memb rane reactor compared to the membrane module is the presence of catalyst (p alladium doped anion-exchange resin based on styrene and divinyl benzene) i n the shell side. The ion-exchange column was fabricated from glass and pac ked with a type-II anionic resin (Purolite A-310) regenerated in the sulphi te form. These methods use either physical stripping or chemical reduction or a combination of both for the removal of dissolved oxygen from water. Th e performance of each of these methods was analyzed, and it was found that the membrane reactor which reduced the dissolved oxygen in water by both ph ysical stripping and chemical reduction gave the best results in terms of t he outlet dissolved oxygen level.