303713 Oxidative Pretreatment to Reverse Osmosis Membranes for Fouling Control: Results From a Pilot-Scale Study of MF MBR-O3-RO System for Water Reuse

Wednesday, June 12, 2013: 9:00 AM
Cedar (Grove Hotel)
Aleksey Pisarenko1,2, Pei Xu3, Yue Wang2, Kathleen Whysner4 and Benjamin Stanford5, (1)Trussell Technologies, Solana Beach, CA, (2)Applied Research & Development, Southern Nevada Water Authority, Las Vegas, NV, (3)Department of Civil Engineering, New Mexico State University, Las Cruces, NM, (4)Denver Water, Denver, CO, (5)Hazen and Sawyer, P.C., Raleigh, NC

The WateReuse Research Foundation project 08-08 (“Pilot-Scale Oxidative Technologies for Reducing Fouling Potential in Water Reuse and Drinking Water Treatment Membrane Systems”), which completed in 2012, continuously piloted two reuse trains to investigate ozone for fouling control in water reuse applications. One treatment train incorporated ozone as a pre-treatment to reverse osmosis (RO) membranes for organic fouling control, while the other was a control train which had no oxidative pretreatment.  The pilot study was conducted at a water reclamation facility in Las Vegas and consisted of a membrane bioreactor (MBR, Hydranautics) - ozone (O3) (HiPOx, APTwater) – RO system and MBR-RO as the control train.  The pilot testing results from WRRF 08-08 study successfully demonstrated that ozone can be beneficial for organic fouling control for challenging waters. Beyond the WRRF 08-08 study, the MBR pilot was intentionally operated under sub-optimal conditions with an SRT of <6 days and an aerobic HRT of <4 hours to produce filtrate with higher levels of ammonia, organic nitrogen, SDI>5, and higher level of TOC to simulate poor pretreatment conditions. Ozone pretreatment was evaluated under these conditions showing a beneficial impact on the fouling rate of the RO membranes. This talk will provide an overview of the RO operational data, membrane autopsy, pretreated water quality and foulant material characterization. Further, we outline future directions of research that may be useful for minimizing membrane-cleaning frequency, improving efficiency, and extending the useful life of RO membranes in water reuse systems.

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See more of this Session: Membrane Fouling - II
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