title: Enhanced submerged membrane bioreactor combined with biosurfactant rhamnolipids: performance for frying oil degradation and membrane fouling reduction.
abstract: In this study, a novel submerged membrane bioreactor (SMBR) combined with rhamnolipids was developed to treat frying oil wastewater and control the problem of membrane fouling. To validate the feasibility of this new design, a hybrid SMBR with additional rhamnolipids (RSMBR) and a controlled SMBR (CSMBR) were run in parallel. Results demonstrated that RSMBR not only held high removal efficiency of oil up to 90% at short hydraulic time, but also exhibited 10 times higher membrane permeability in comparison to CSMBR. The presence of rhamnolipids greatly enhanced the contact and reaction between the microorganism and oil molecules. The great improvement in membrane filterability was associated with an increase in hydrophobicity of flocs as well as the increase of particle size from 53.06 to 145.54 μm. The oil strongly adhered to the surface of flocs by rhamnolipids, and consequently prevented larger oil droplets directly depositing on the membrane surface.
authors.affiliation: College of Chemical Engineering and Materials Science, Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Qin
authors.forename: Guoliang
authors.initials: G
authors.lastname: Zhang
authors.forename: Qin
authors.initials: Q
authors.lastname: Meng
authors.forename: Hongzi
authors.initials: H
authors.lastname: Zhang
authors.forename: Lusheng
authors.initials: L
authors.lastname: Xu
authors.forename: Bosheng
authors.initials: B
authors.lastname: Lv
mesh_terms: D057219:Biofouling / Q000517:prevention & control*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D003296:Cooking; D005427:Flocculation; D006017:Glycolipids / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008567:Membranes, Artificial; D009821:Oils / Q000737:chemistry*; D010316:Particle Size; D010539:Permeability; D012722:Sewage / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*; D013997:Time Factors; D062065:Wastewater / Q000737:chemistry
chemical_list: D006017:Glycolipids; D008567:Membranes, Artificial; D009821:Oils; D012722:Sewage; D013501:Surface-Active Agents; D062065:Wastewater; C418382:rhamnolipid