title: Effect of disintegrated sludge recycling on membrane permeability in a membrane bioreactor combined with a turbulent jet flow ozone contactor.
abstract: We have combined a turbulent jet flow ozone contactor (TJC) with a membrane bioreactor (MBR) to establish a zero-discharge system in terms of excess sludge in the MBR. The TJC-MBR system was compared with the conventional MBR (Control-MBR) with respect to i) the size and zeta potential of the sludge particles, ii) the loosely bound extra-cellular polymeric substances (EPSs) and tightly bound EPS of the microbial flocs, iii) the porosity and biovolume of the bio-cake accumulated on the membrane, and iv) the membrane permeability. The TJC system generated the ozonated sludge with a negligible amount of loosely bound EPS and a positive zeta potential. As a result, when such ozonated sludge was recycled, the average size of the sludge particles (e.g., microbial flocs) increased in the TJC-MBR. Consequently the bio-cake formed in the TJC-MBR had greater porosity than that in the Control-MBR, giving rise to higher membrane permeability in the TJC-MBR.
authors.affiliation: School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea.
authors.forename: Byung-Kook
authors.initials: BK
authors.lastname: Hwang
authors.forename: Jae-Hyuk
authors.initials: JH
authors.lastname: Kim
authors.forename: Chang Hoon
authors.initials: CH
authors.lastname: Ahn
authors.forename: Chung-Hak
authors.initials: CH
authors.lastname: Lee
authors.forename: Jae-Yoon
authors.initials: JY
authors.lastname: Song
authors.forename: Young-Hyun
authors.initials: YH
authors.lastname: Ra
mesh_terms: D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D002850:Chromatography, Gel; D003247:Conservation of Natural Resources; D005110:Extracellular Space / Q000378:metabolism; D005374:Filtration; D005427:Flocculation; D008567:Membranes, Artificial; D010126:Ozone / Q000737:chemistry*; D010316:Particle Size; D010539:Permeability; D011108:Polymers / Q000378:metabolism; D012722:Sewage / Q000032:analysis* / Q000382:microbiology; D012995:Solubility; D014865:Waste Disposal, Fluid / Q000295:instrumentation; D014872:Water Movements; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D008567:Membranes, Artificial; D011108:Polymers; D012722:Sewage; D010126:Ozone