Hydraulic optimization of membrane bioreactor via baffle modification using computational fluid dynamics

Membrane bioreactors – A review on recent developments in energy reduction, fouling control, novel configurations, LCA and market prospects

“…However, an important aspect of mechanical cleaning with granules or carriers that requires further study is the promotion of physically irreversible fouling and the risk of membrane surface damage [112]. In baffled membrane bioreactors (BMBR), baffles divide the membrane tank into sections that during aeration, due to difference in gas hold-up and fluid density, create a cross flow over the membrane's surface [113]. Recently, the use of baffles, inserted into the membrane compartment of submerged MBRs, were investigated to optimize hydraulic conditions in the reactor in order to improve aeration efficiency [113] and to enhance the efficiency of mechanical cleaning with granules [112].…”

“…During pilot-scale experiments, the average removal efficiencies of TOC, TP and TN were 85%, 97% and 77%, respectively [140]. Furthermore, due to difference in gas hold-up and fluid density in different zones, during aeration a cross flow over membrane surface is created providing additional membrane cleaning [113]. For example, Shariati et al [141] developed an airlift oxidation ditch membrane bioreactor (AOXMBR) consisting of submerged flat-sheet membrane and air injection system placed between two baffles providing aeration for biological purposes, membrane scouring and activated sludge circulation.…”

“Capillary‐Bridge Lithography” for Patterning Organic Crystals toward Mode‐Tunable Microlaser Arrays

“…[38,39] Detailed calculation methods is provided in Note S1 of the Supporting Information. The basic principle of this technology is to discretize the continuous fluid using proper algorithms, generating a mesh as the computational domain.…”

CFD simulation and optimization of membrane scouring and nitrogen removal for an airlift external circulation membrane bioreactor

“…An average shear stress of 0.5 Pa in a full scale MBR was reported while an average shear stress of 0.6-0.7 Pa in a pilot scale MBR can be achieved with the dosing of flocculent, Fe (II) (Liu et al, 2015). The average membrane shear stress can be 0.5-2.0 Pa with SAD m = 0.5-9.0 m 3 m À2 h À1 in a lab-scale MBR (Yan et al, 2016(Yan et al, , 2015. In this study, the shear stress of 0.9 Pa at SAR 25 (SAD m = 1.0 m 3 m À2 h À1 ) was achieved.…”