title: Ozone-biological activated carbon as a pretreatment process for reverse osmosis brine treatment and recovery.
abstract: Ozonation was used in this study to improve biodegradability of RO brine from water reclamation facilities. An ozone dosage ranging from 3 to 10 mg O(3)/L and contact times of 10 and 20 min in batch studies were found to increase the biodegradability (BOD(5)/TOC ratio) of the RO brine by 1.8-3.5 times. At the same time, total organic carbon (TOC) removal was in the range of 5.3-24.5%. The lab-scale ozone-biological activated carbon (BAC) at an ozone dosage of 6.0mg O(3)/L with 20-min contact time was able to achieve 3 times higher TOC removal compared to using BAC alone. Further processing with Capacitive Deionization (CDI) process was able to generate a product water with better water quality than the RO feed water, i.e., with more than 80% ions removal and a lower TOC concentration. The ozone-BAC pretreatment has the potential of reducing fouling in the CDI process.
authors: Centre for Water Research, Division of Environmental Science & Engineering, Faculty of Engineering, National University of Singapore, Singapore 117576, Singapore.
authors: Lai Yoke
authors: LY
authors: Lee
authors: How Yong
authors: HY
authors: Ng
authors: Say Leong
authors: SL
authors: Ong
authors: Jiang Yong
authors: JY
authors: Hu
authors: Guihe
authors: G
authors: Tao
authors: Kiran
authors: K
authors: Kekre
authors: Balakrishnan
authors: B
authors: Viswanath
authors: Winson
authors: W
authors: Lay
authors: Harry
authors: H
authors: Seah
mesh_terms: D001673:Biodegradation, Environmental; D002244:Carbon / Q000032:analysis*; D009995:Osmosis; D010126:Ozone / Q000737:chemistry*; D012492:Salts / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D012492:Salts; C017082:brine; D010126:Ozone; D002244:Carbon