Membrane fouling in a pilot-scale submerged membrane bioreactor operated under various conditions

The use of electrical resistance tomography for the characterization of gas holdup inside a bubble column bioreactor containing activated sludge

“…The above mentioned specific particle size was found to be around 70 microns for water, but its value slightly went up when viscous glucose solutions were employed. The particle size distribution for the activated sludge flocs in the present study was not measured but most previous reports point to an average particle size lower or much lower than 70 microns [22,50,51]. In the present study, according to Eq.…”

Role of dissolved organic matters (DOM) in membrane fouling of membrane bioreactors for municipal wastewater treatment

“…Many reports considered that carbohydrates were a more important factor causing membrane fouling than protein and humic acid-like substances [11,18]. Herzberg et al also reported that the carbohydrates induced more severe fouling of reverse osmosis (RO) membranes compared to proteins [33].…”

“…DOM originated from biological wastewater treatment process may include organic compounds of different groups, such as carbohydrates, proteins and more biologically resistant components known as fulvic and humic acid materials [16,17]. Several researchers have reported that polysaccharide-like substances contributed to fouling more significantly than protein-like substances [11,18], while Hernandez Rojas et al [19] found that the concentration of proteins in SMP showed significant influences on membrane fouling in terms of the specific resistances increase. With a smaller molecular weight (MW), humic acid substances contained in the liquid phase could not be retained by the membrane, and therefore may not significantly participate in MBR fouling [20].…”

A comparison study on membrane fouling in a sponge-submerged membrane bioreactor and a conventional membrane bioreactor

“…In this study, increase of sludge concentration under infinite SRT condition induced the decrease in food to microorganism (F/M) ratio (0.1-0.2 d À1 ). As a consequence, both MBRs were fed with limited available substrate, which could cause more cell lysis and cell hydrolysis, thereby releasing EPS and SMP in activated sludge (Yigit et al, 2008). Moreover, the excess growth of filamentous bacteria could produce more SMP, resulting in severe fouling (Pan et al, 2010).…”