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Modeling Ozone Mass Transfer in Reclaimed Wastewater
Author(s) -
Jiang Pan,
Chen HsiaoTing,
Babcock Roger W.,
Stenstrom Michael K.
Publication year - 2009
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143008x325782
Subject(s) - ozone , chemistry , mass transfer , wastewater , oxygen , mass transfer coefficient , environmental chemistry , environmental engineering , environmental science , chromatography , organic chemistry
Ozone mass transfer in reclaimed water was evaluated at pilot scale to determine mass‐transfer characteristics and reaction kinetics and to assess the use of oxygen as a surrogate to measure this process. Tests were conducted in a 40‐L/min pilot plant over a 3‐year period. Nonsteady‐state mass‐transfer analyses for both oxygen and ozone were performed for superficial gas flow rates ranging from 0.13m/min to 0.40m/min. The psi factor, which is the ratio of volumetric mass‐transfer coefficients of ozone to oxygen, was determined. The decrease in oxygen transfer rate caused by contaminants in reclaimed water was only 10 to 15% compared to tap water. A simple mathematical model was developed to describe transfer rate and steady state ozone concentration. Ozone decay was modeled accurately as a pseudo first‐order reaction between ozone and ozone‐demanding materials.