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    Application of Forward Osmosis Membrane in a Sequential Batch Reactor for Water Reuse

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    Type
    Thesis
    Authors
    Li, Qingyu
    Advisors
    Amy, Gary L.
    Committee members
    Wang, Peng cc
    Yangali-Quintanilla, Victor
    Program
    Environmental Science and Engineering
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2011-07
    Permanent link to this record
    http://hdl.handle.net/10754/209393
    
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    Abstract
    Forward osmosis (FO) is a novel membrane process that potentially can be used as an energy-saving alternative to conventional membrane processes. The objective of this study is to investigate the performance of a FO membrane to draw water from wastewater using seawater as draw solution. A study on a novel osmotic sequential batch reactor (OsSBR) was explored. In this system, a plate and frame FO cell including two flat-sheet FO membranes was submerged in a bioreactor treating the wastewater. We found it feasible to treat the wastewater by the OsSBR process. The DOC removal rate was 98.55%. Total nitrogen removal was 62.4% with nitrate, nitrite and ammonium removals of 58.4%, 96.2% and 88.4% respectively. Phosphate removal was almost 100%. In this OsSBR system, the 15-hour average flux for a virgin membrane with air scouring is 3.103 LMH. After operation of 3 months, the average flux of a fouled membrane is 2.390 LMH with air scouring (23% flux decline). Air scouring can help to remove the loose foulants on the active layer, thus helping to maintain the flux. Cleaning of the FO membrane fouled in the active layer was probably not effective under the conditions of immersing the membrane in the bioreactor. LC-OCD results show that the FO membrane has a very good performance in rejecting biopolymers, humics and building blocks, but a limited ability in rejecting low molecular weight neutrals.
    Citation
    Li, Q. (2011). Application of Forward Osmosis Membrane in a Sequential Batch Reactor for Water Reuse. KAUST Research Repository. https://doi.org/10.25781/KAUST-14K21
    DOI
    10.25781/KAUST-14K21
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-14K21
    Scopus Count
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Theses

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