Advanced treatment of membrane bioreactor (MBR) effluents for effective wastewater reclamation

One of the two main objectives of this work is to oxidize MBR effluents with ozone/peroxide in high pH conditions in order to improve oxidation of pharmaceuticals, which could efficiently be rejected by the nanofiltration (NF) stage. The other main objective is to effectively oxidize of dissolved or...

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Bibliographic Details
Published in:Water science and technology 2011-01, Vol.63 (2), p.303-310
Main Authors: Sarp, Sarper, Chon, Kangmin, Kim, In S, Cho, Jaeweon
Format: Article
Language:English
Subjects:
Biofouling
Bioreactors
Dissolved organic carbon
Drugs
Effluents
Fouling
Free radicals
Hollow fiber membranes
Hydrogen peroxide
Hydrogen-Ion Concentration
Membrane reactors
Membranes, Artificial
Nanofiltration
Nanotechnology
Naproxen
Oxidation
Oxidation resistance
Oxidation-Reduction
Ozone
Ozone - chemistry
pH effects
Pharmaceutical Preparations - isolation & purification
Pharmaceuticals
Reclamation
Removal
Solutions
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Wastewater
Wastewater renovation
Wastewater treatment
Water Purification - instrumentation
Water Purification - methods
Water reclamation
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Summary:One of the two main objectives of this work is to oxidize MBR effluents with ozone/peroxide in high pH conditions in order to improve oxidation of pharmaceuticals, which could efficiently be rejected by the nanofiltration (NF) stage. The other main objective is to effectively oxidize of dissolved organic carbon (DOC) in MBR effluents in order to decrease fouling in the filtration stage. In this work, ozone/peroxide oxidation was applied to the MBR effluents in high pH conditions in order to improve the formation of OH radicals, and oxidized effluents were filtered by the NF membrane (NE90) in order to investigate fouling potentials and the removal of pharmaceuticals. Natural and synthetic wastewater samples were used as feed solutions for the MBR system, which was equipped with a U-shaped hollow fiber membrane module. The flux decline was decreased from 29% to 15% when 9 mg/L of ozone was used, the same decline was also observed when 6 mg/L ozone and hydrogen peroxide (1/1 ozone/peroxide mol ratio) were used. A further decrease in flux decline was observed when pH was adjusted to 9.00 (29% to 9%) prior to the ozone/peroxide oxidation. In most cases, the increase in the ozone dose, the addition of hydrogen peroxide and the adjustment of the pH level led to an increase in the removal of pharmaceuticals. Iopromide, TCEP and Naproxen were found to be more resistant to the oxidation when pH was increased.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2011.054