Ozone deodorizer

Details Ozone deodorizer Ozone deodorizer

1998-10-14

2001-09-11

Simmons, David A. (Department: 1724)

Liquid purification or separation

With preliminary chemical manufacture

C210S916000, C239S398000, C261SDIG004, C422S168000

Reexamination Certificate

active

06287465

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an ozone deodorizer for deodorizing a waste water treatment vessel.
BACKGROUND ART
Household waste water from homes and industrial waste water from offices are collected through sewage work to waste water treatment facilities where the waste water is purified by various treatments and then is discharged to rivers and/or seas.
On the other hand, various deodorizers are used to suppress diffusion of offensive smell from sewage collected at the waste water treatment facilities.
FIG. 1
illustrates an example of a waste water treatment system or facility where an ozone deodorizer as disclosed in Japanese Utility Model 3002318 is applied. This waste water treatment system comprises an upwardly opened treatment vessel body
1
, a cover
2
on the vessel body
1
and an exhaust pipe
4
vertically extending through the cover
2
and having an exhaust fan
3
at its intermediate portion.
The treatment vessel body
1
is buried in the ground such that the cover
2
is positioned near the ground surface. Provided inside the vessel body
1
are pre-treatment, adjustment and aeration vessels
5
,
6
and
7
.
Sewage to be treated flows from outside into the pre-treatment vessel
5
via a screen
8
which serves to remove relatively large dust and refuse.
The sewage treated in the pre-treatment vessel
5
flows over a weir between the vessels
5
and
6
into the adjustment vessel
6
since new sewage flows from outside into the vessel
5
. Likewise, the sewage treated in the adjustment vessel
6
flows over a weir between the vessels
6
and
7
into the aeration vessel
7
since new sewage flows from the pre-treatment vessel
5
into the adjustment vessel
6
.
Further, the sewage, which has been purified by the various treatments in the vessels
5
,
6
and
7
to have BOD (biochemical oxygen demand) and the like values within levels as allowable by laws, regulations and the like, is pumped from the aeration vessel
7
by a pump (not shown) and is discharged to rivers and/or seas.
The ozone deodorizer comprises a filter box
9
for removing particulates and the like in the air through filtration of the air, an oxygen generator
10
for extracting oxygen (
0
2
) by applying and reducing pressure on the air filtered through the filter box
9
, an ozone generator
11
for generating ozone (
0
3
) by applying high voltage on the oxygen from the oxygen generator
10
, a fan
12
for sucking and discharging the air, a discharge pipe
13
extending through the cover
2
such that its upstream and downstream portions are positioned above and below the cover
2
, respectively, and a plurality of branch pipes
15
connected to the downstream portion of the discharge pipe
13
and communicated with a space
14
defined by the cover
2
and the treatment vessel body
1
.
The above-mentioned filter box
9
, oxygen generator
10
, ozone generator
11
and fan
12
are arranged outside the treatment vessel body
1
. An ozone outlet of the ozone generator
11
and an air outlet of the fan
12
are connected to the upstream portion of the discharge pipe
13
.
In the waste water treatment system shown in
FIG. 1
, actuation of the oxygen generator
10
, ozone generator
11
, and fan
12
causes mixture of ozone generated by the ozone generator
11
with the air from the fan
12
to flow through the discharge pipe
13
and branch pipes
15
into the space
14
defined by the cover
2
and vessel body
1
.
The ozone contained in this mixture oxidizes smell components such as hydrogen sulfide (H
2
S) and ammonia (NH
3
) emitted from the sewage to be treated in the vessels
5
,
6
and
7
to reduce the offensive smell.
However, half-life of ozone in the atmospheric air is about 13 hours. As is disclosed in the above, reaction rate of oxidation of the smell components emitted from the sewage inside the waste water treatment system is not very high. Relatively long time is required for the reaction of ammonia with ozone so that the reaction may be carried out inefficiently within the limited time.
From these reasons, in the waste water treatment system shown in
FIG. 1
, the offensive smell components emitted from the sewage may not be sufficiently oxidized by ozone and may be discharged together with unreacted ozone to outside through the exhaust pipe
4
, resulting in diffusion of the offensive smell outside the waste water treatment system.
The present invention was made in view of the above and has its object to provide an ozone deodorizer which can efficiently eliminate smell components.
DISCLOSURE OF THE INVENTION
In an ozone deodorizer according to the invention, ozone generated by an ozone generator is supplied to an atomizer nozzle by gas supply means. Water is supplied to the atomizer nozzle by water supply means. Thus, hydroxyl radicals with high activity of oxidizing smell components are generated by the ozone and water molecules of fine water particles sprayed by the atomizer nozzle into the waste water treatment vessel.


REFERENCES:
patent: 3949055 (1976-04-01), Schneider et al.
patent: 4550010 (1985-10-01), Chelu
patent: 4652370 (1987-03-01), Bachofer et al.
patent: 4844874 (1989-07-01), DeVries
patent: 5017351 (1991-05-01), Rafson
patent: 5494576 (1996-02-01), Hoppe et al.
patent: 5501401 (1996-03-01), Munk
patent: 5593598 (1997-01-01), McGinness et al.
patent: 54-2265 (1977-06-01), None
patent: 55-5775 (1980-01-01), None
patent: 4-22747 (1987-07-01), None
patent: 3002318 (1994-03-01), None

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