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  • Title: Ozone-biological activated carbon as a pretreatment process for reverse osmosis brine treatment and recovery.
    Author: Lee LY, Ng HY, Ong SL, Hu JY, Tao G, Kekre K, Viswanath B, Lay W, Seah H.
    Journal: Water Res; 2009 Sep; 43(16):3948-55. PubMed ID: 19580984.
    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.
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