title: Bioaugmented membrane bioreactor (MBR) with a GAC-packed zone for high rate textile wastewater treatment.
abstract: The long-term performance of a bioaugmented membrane bioreactor (MBR) containing a GAC-packed anaerobic zone for treatment of textile wastewater containing structurally different azo dyes was observed. A unique feeding strategy, consistent with the mode of evolution of separate waste streams in textile plants, was adopted to make the best use of the GAC-zone for dye removal. Dye was introduced through the GAC-zone while the rest of the colorless media was simultaneously fed through the aerobic zone. Preliminary experiments confirmed the importance of coupling the GAC-amended anaerobic zone to the aerobic MBR and also evidenced the efficacy of the adopted feeding strategy. Following this, the robustness of the process under gradually increasing dye-loading was tested. The respective average dye concentrations (mg/L) in the sample from GAC-zone and the membrane-permeate under dye-loadings of 0.1 and 1 g/L.d were as follows: GAC-zone (3, 105), permeate (0, 5). TOC concentration in membrane-permeate for the aforementioned loadings were 3 and 54 mg/L, respectively. Stable decoloration along with significant TOC removal during a period of over 7 months under extremely high dye-loadings demonstrated the superiority of the proposed hybrid process.
authors.affiliation: Environmental Science Center, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. faisal@uow.edu.au
authors.forename: Faisal Ibney
authors.initials: FI
authors.lastname: Hai
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Fumiyuki
authors.initials: F
authors.lastname: Nakajima
authors.forename: Kensuke
authors.initials: K
authors.lastname: Fukushi
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D001391:Azo Compounds / Q000737:chemistry / Q000302:isolation & purification; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002244:Carbon / Q000032:analysis; D002606:Charcoal / Q000737:chemistry*; D003116:Color; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D007220:Industrial Waste / Q000032:analysis*; D008567:Membranes, Artificial; D009281:Naphthalenes / Q000737:chemistry / Q000302:isolation & purification; D013784:Textiles; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000295:instrumentation*; D018508:Water Purification / Q000295:instrumentation*
chemical_list: C456587:Acid Orange II; D001391:Azo Compounds; D004396:Coloring Agents; D007220:Industrial Waste; D008567:Membranes, Artificial; D009281:Naphthalenes; D002606:Charcoal; D002244:Carbon