Application of coagulation and conventional filtration in raw water pretreatment before microfiltration membranes

Performance of a coagulation–ultrafiltration hybrid process for water supply treatment

“…The coagulation step alone is not sufficient to the complete disinfection of the treated water, thus justifying the use of UF. Therefore, the tested membrane can be successfully applied to water disinfection, since overall efficiency of UF for disinfection has been widely studied and demonstrated [7,8]. Unlike conventional processes, removal of microorganisms by UF is complete without the addition of other reagents, and regardless of variations in the quality of the supply.…”

“…To overcome the problems caused by natural organic matter (NOM) in UF applications, conjunctive use of coagulation and membranes is becoming more attractive for water treatment because the coagulation is an opportunity to join NOM with other particles present in water before NOM reaches the membrane surface [7]. The NOM found in the liquid leads to membrane fouling, flux reduction and inferior effluent quality.…”

“…Several researchers, such as Zularisam et al [11], Konieczny et al [12], Barbot et al [13], Mo and Huang [14], Sakol et al [7], and Xia et al [4] have used the hybrid process of coagulation/flocculation followed by UF (CF-UF) or microfiltration for water treatment. However, the vast majority of authors studied the treatment of water with low turbidity and used inorganic salts as coagulants, mainly iron salts and aluminum sulfate.…”

Applications of membrane techniques for purification of natural products

“…Much effort has been paid to the prevention of membrane fouling, e.g. dosing with oxidant or anti-fouling agents (Durham and Walton 1999;Sakol and Konieczny 2004). Some recent studies have developed strategies to recover the decreasing flux.…”

Effect of Coagulation on Submerged Ultrafiltration Membrane

“…Pretreatment generally plays a critical role in surface water treatment because of the wide fluctuation in water quality. Among the various pretreatment methods available, such as media filters [4], activated carbon [5,6] and adsorbents [7,8], coagulation has been commonly used as a cost-effective pretreatment method to remove organic matter and colloids [9][10][11]. Coagulants are easily hydrolyzed in water to neutralize the surface charge of negatively charged particles and form aggregates of a removable size by allowing particles to bind due to attractive forces.…”