Effect of salt concentration on membrane bioreactor (MBR) performances: Detailed organic characterization

Performance of membrane bioreactor (MBR) systems for the treatment of shipboard slops: Assessment of hydrocarbon biodegradation and biomass activity under salinity variation

“…It is worth noting that in sub-phase I 5 , there was an increase of SMP production as a response of microorganisms to salinity, by the release of organic cellular constituents through secretion and cell autolysis [5,18,20,63]. In contrast, the EPS concentration in the MB-MBR plant during sub-phase I 5 was almost constant and lower than that observed for the MBR system, with an average value lower than 240 mg EPS g −1 VSS.…”

“…However, one of the major challenges of the MBR process hindering its extended application is still represented by fouling phenomena [21,[25][26][27][28]. This situation might be exacerbated when treating shipboard slops because high levels of salinity and petroleum hydrocarbons can exert significant stress on the bacterial consortium, providing a worsening of mixed liquor characteristics in terms of viscosity, amount of filamentous bacteria, extracellular polymeric substances (EPSs) and soluble microbial products (SMPs), producing substantial membrane fouling [19,20,29]. In recent years it has been suggested to combine membranes with biofilm systems with the aim of improving the performance of the whole system, in terms of pollutant removal and membrane filtration.…”

“…Conversely, the use of biological treatments is becoming increasingly popular in the field of saline wastewater characterised by high organic content and petroleum hydrocarbons [5,[10][11][12][13][14][15], even if the presence of high concentrations of a separate oily phase usually requires proper pre-treatment [16]. In recent years, membrane bioreactors (MBRs) have been applied for saline wastewater treatment [17][18][19][20]. Indeed, MBRs feature high-quality effluent, small footprint and low sludge production rates [21].…”

Sequential batch membrane bio-reactor for wastewater treatment: The effect of increased salinity

“…However, it is crucial to investigate how biomass kinetics and activated sludge features affect the biological and physical performance of MBRs used to treat saline wastewater. With this in mind, several studies have been recently carried out on MBRs treating saline wastewater (Jang et al, 2013;Johir et al, 2013;Di Trapani et al, 2014;Luo et al, 2015). Jang et al (2013) found a reduction of the ammonia removal and an increase in membrane fouling when treating high salinity wastewater was due to particular features of the microbial http://dx.doi.org/10.1016/j.biortech.2016.02.122 0960-8524/Ó 2016 Elsevier Ltd. All rights reserved.…”

Characterization and Treatment Proposals of Shipboard Slop Wastewater Contaminated by Hydrocarbons

“…In this context, membrane materials are relevant for the treatment of oily wastewater and, until now, ceramic membranes are favored over polymeric membranes because of their superior mechanical stability. In addition, high concentrations of salinity and petroleum hydrocarbons can exert significant stress towards the biomass, resulting in an overall worsening of mixed liquor characteristics in terms of viscosity, amount of filamentous bacteria, extracellular polymeric substances (EPSs) and soluble microbial products(SMPs), producing substantial membrane fouling [32][33][34]. Recently, MBRs are used together with biofilm such as moving bed biofilm reactors (MBBRs) to promote biofilm growth on mobile carriers and to enhance the overall biological removal efficiencies performances [35].…”