O3 and UV/O3 oxidation of organic constituents of biotreated municipal wastewater.
Dissolved organic matter (DOM) in the biotreated effluent of a municipal wastewater treatment plant was separated by XAD-8 and XAD-4 resins into four fractions: hydrophobic acids, non-acid hydrophobics, transphilics and hydrophilics. Ozonation with and without ultraviolet (UV) enhancement removed most UV-absorbing substances in the first 30 min achieving 78% and 63% reduction in UV254, respectively; the UV enhancement resulted in a greater reduction in dissolved organic carbon (DOC) (90% vs. 36%). Ozone reacted sequentially with aromatic hydrophobics, transphilics, and then hydrophilics; however, under UV, it reacted with all four organic fractions simultaneously. Low-MW hydrophilics were the most abundant fraction in the ozone-treated effluent.
Gong
Jianli
J
School of Resource and Environmental Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China. jianli.gong@gmail.com <jianli.gong@gmail.com>
Liu
Yongdi
Y
Sun
Xianbo
X
D002244:Carbon / Q000032:analysis / Q000737:chemistry / Q000528:radiation effects; D007475:Ion Exchange Resins; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D011137:Polystyrenes; D011145:Polyvinyls; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014873:Water Pollutants / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects*
D007475:Ion Exchange Resins; D010083:Oxidants, Photochemical; D011137:Polystyrenes; D011145:Polyvinyls; D014873:Water Pollutants; C012101:XAD-4 resin; D010126:Ozone; D002244:Carbon