Milan (Fig. 1). The AOP plant consisted of a UV/O3
chamber in which UV radiation was produced by a
Krypton lamp. The ozone was produced by the
formation of Od radicals resulting fromthe action of
UV radiation on oxygen molecules in the aspirated
air and it diffuses through the chamber with the help
of a Venture device. At the same time the hydrogen
peroxide, when necessary, was added through a
peristaltic pump. Next, the water to be treated
entered the UV/O3 chamber where it passed through
a quartz tube and was irradiated with UV light. This
resulted in the production of hydroxylic radicals
(OHd), fromozone and hydrogen peroxide, which
can improve the speed and efficiency of the oxidation
process by about 40 times (experiments conducted
with pesticides at 201C [28]). The treated water
was circulated in the AOP pilot plant through an
ozone dispersion device. The AOP treatment was
conducted following a cyclic procedure by using
150L of water at three different contact times (30, 60
and 120 min) that correspond to 3.5, 7 and 15 cycles,
respectively. The main AOP process characteristics
were: reactor chamber volume=41 L; pump
flow=900 L/h; UV radiation=40,000mVs/cm3;
UV/O3 chamber intensity=2.32 A; krypton gas lamp
frequency and wavelength=50 Hz and l=185–
254 nm; ozone concentration: production in the
reactor chamber=480 mg/h, ozone dose=0.4 mg/L
ozone concentration; a hydrogen peroxide solution
(35% v/v) was added to the raw water