Ozone-biological activated carbon as a pretreatment process for reverse osmosis brine treatment and recovery |
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Authors: | Lai Yoke Lee Say Leong Ong Guihe Tao Balakrishnan Viswanath Harry Seah |
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Affiliation: | a Centre for Water Research, Division of Environmental Science & Engineering, Faculty of Engineering, National University of Singapore, Singapore 117576, Singapore b Centre for Advanced Water Technology, Singapore Utilities International, Singapore c Public Utilities Board, Singapore |
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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 O3/L and contact times of 10 and 20 min in batch studies were found to increase the biodegradability (BOD5/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 6.0 mg O3/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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Keywords: | Biodegradability Water reclamation Capacitive deionization Organics removal Ozonation Recovery Reverse osmosis brine |
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