Device for cleaning fluid media containing particulate matter, particularly from livestock husbandry, through ozonization in a closed ozonizing container and subsequent separation of the particulate matter portions.
Wastewater from livestock husbandry containing feces, namely liquid manure, is typically collected in storage tanks and after the harvest deployed on farmland as natural fertilizer. As a result, a significant amount of unpleasant odor is generated in the environment.
Such wastewater collection occurs also onboard ships. More particularly, a significant amount of wastewater is produced onboard large seagoing vessels, in particular cruise ships, which cannot and must not simply be discarded overboard. As a result, a commensurately large tank storage space must be provided.
DE 29 20 010 A1 discloses removing contaminants in ground water and surface water with ozone. In this way, wastewater with natural contaminants or contaminants stemming from production processes of the chemical industry is cleaned.
A method for condensing and freezing water vapor from a gas mixture disclosed in DE-OS 1 960 953 is in employed in systems used to precipitate a particular component, for example sulfur dioxide, from a gas mixture, wherein the cold residual gas is used for heat exchange with supplied hot and unprocessed gas, and the gas mixture is supposedly relatively free of water before entering the condenser. It is known from DE-OS 2 025 523 to perform volumetric measurements for monitoring and controlling chemical treatment baths.
The publication “Wasser, Luft und Betrieb” (Water, Air and Operation), 19 (1975) No. 4, p. 147-152 discloses the use of ozone for the treatment of water and air. DE-AS 10 62 394 discloses a method and an apparatus for removing odor from air, in particular from industrial waste gases, with ozone, which in essence consists of an inlet tube with a Venturi nozzle. The contaminated air is mixed via the inlet tube with ozone in a mixing device, wherein the ozone is suctioned from an ozinator by a vacuum created at the Venturi nozzle of the inlet tube.
U.S. Pat. No. 4,430,306 discloses an apparatus for recovering oxygen after ozonizing reactions. To this end, O2 which is not consumed in an ozonizing reaction is supplied to a drying tower where contaminants such as water, organic contaminants and CO2 are absorbed on zeolites. The cleaned oxygen is returned to the ozinator for increasing the ozone yield.
GB 1 427 614 C1 describes a method and an apparatus capable of cleaning contaminated, in particular foul air by applying ozone. Ozone-saturated moist air and very fine ozone-saturated water droplets are blown into the contaminated gases, wherein the ozone concentration can be continuously measured and regulated.
While all these methods and apparatuses are used for removing noxious odors caused by contaminated wastewater, the contaminated wastewater must be intermediately stored in relatively large tank vessels and the ozone consumption is relatively high. This requires significant storage space which is generally not unlimited, in particular on ships. Moreover, they are not suited to remove the sources from the wastewater at reasonable costs and to keep the required intermediate storage space as small as possible.
It is an object of the invention to provide a device for removing contaminants from liquid media, which minimizes the ozone consumption and which is capable of cost-effectively removing the suspended particles causing the unpleasant odors.
This object is attained with the features recited in claim 1. Advantageous embodiments of the invention are recited in the dependent claims.
The device according to the invention includes a closed ozonizing container, in which vertical hollow-cylindrical fixtures are arranged, the fixtures are operatively connected with a rotatable agitator shaft, with agitation means associated with the agitator shaft, and the fixtures are provided with feed lines through which ozone can be introduced.
An advantageous embodiment of the invention has a closed ozonizing container in which a vertical hollow-cylindrical fixture which is open on both ends is arranged, with a rotatable agitator shaft passing through the fixture and a agitating propeller being associated with both ends of the agitator shaft, wherein the fixture is provided with a ring-shaped line through which the ozone can be introduced into the hollow-cylindrical fixture; the closed ozonizing container is preferably spherical.
The device according to the invention can therefore very effectively neutralize constituents in the wastewater that cause unpleasant odors at low costs.
According to another advantageous embodiment of the invention, a conventional stator is provided in the ozonizing container on the bottom end of the agitator shaft, in which a very fast rotating rotor is arranged as agitation means. The agitator shaft is supported on its top end in a bearing flange and is driven by an electric motor.
With this embodiment, relatively high shearing forces are generated with which particulate matter lumps suspended in the medium to be cleaned can be broken down and the medium can be homogenized.
In the device according to the invention, the ring-shaped line for introducing ozone is arranged in the region of the bottom opening of the hollow-cylindrical fixture. These measures ensure that the wastewater intensively interacts with the ozone and is effectively aerated with the gas.
In another advantageous embodiment of the device according to the invention, the ring-shaped line includes nozzles oriented radially into the fixture. Particularly fine ozone bubbles can be generated with this arrangement. As a result of the increased surface area, the reactive surface of the wastewater also increases which shortens the application time of the ozone and hence also shortens the process.
In a particularly advantageous embodiment of the device according to the invention, the agitator propellers arranged on both ends produce a flow in the fixture. The wastewater is thereby permanently kept in motion, so that larger solid components are unable to settle.
It is also ensured that heavy solid components are kept suspended in the wastewater and are prevented from lumping together and settling, which would remove them from the interaction with the ozone.
In another preferred embodiment of the device according to the invention, a closed material separating container, into which the wastewater that was previously treated with ozone in the ozonizing container can be transferred by pumping, is arranged downstream of the closed container. The wastewater pumped from the closed ozonizing container is centrifuged in the material separating container. The heavier flocculated particulate matter is transported to the outside into catch bags for heavy materials, where they are collected and optionally separated. The remaining and now clean wastewater can be readily disposed of.
According to an embodiment according to the invention, the catch bags for heavy materials have discharge flaps which open downward. The flocculated separated heavy materials can then be removed and intermediately stored without taking up much space. The volume of the contaminants which must be intermediately stored for proper disposal can thereby be significantly reduced.
In another preferred embodiment of the device according to the invention, a conventional material separating device is used for separating the suspended particles from the homogenized ozonized medium. The material separating device essentially includes a horizontal housing with an inlet for the medium to be cleaned, wherein a receiving drum which consists of a cylindrical drum part and a conical drum part is disposed inside the housing; a feed screw which is operatively connected with the interior surface of the conical drum part is arranged in the receiving drum.
Exemplary embodiments of the invention will now be described with reference to the appended drawing, which shows in:
The cleaning device 10 according to the invention illustrated in
In the installed position, the spherical ozonizing container 11 has at the top a welding neck flange 12 with a manhole 13. The ozonizing container 11 may be inspected, as necessary, through the manhole 13.
The manhole 13 may be closed to the outside with a blind flange 14. An agitator drive 15, for example an electric motor, is attached on the blind flange 14. An agitator shaft 16, which extends in the installed position perpendicular through a hollow-cylindrical fixture 17 in the spherical ozonizing container 11, can be driven with the agitator drive 15.
The hollow-cylindrical fixture 17 has in the installed position at the top an upper agitator propeller 18 and in the installed position at the bottom a lower agitator propeller 19. The agitator propellers 18 and 19 generate in the hollow-cylindrical fixture 17 a flow 20 of the wastewater to be cleaned which extends from the top to the bottom. To support the flow 20, the hollow-cylindrical fixture 17 has at its top edge a funnel insert 21.
The hollow-cylindrical fixture 17 has in the installed position at the bottom a ring-shaped line 22 through which ozone can be blown in radially inwardly via unillustrated nozzles. The ozone reaches the ring-shaped line 22 from an external ozone generator 24 through an ozone supply line 23, from where the ozone is blown in against the flow 20. This causes optimal intermixing between the wastewater to be cleaned and the ozone. Control fittings 26 are provided for withdrawing samples.
The spherical ozonizing container 11 rests on container supports 27 and includes a drain fixture 25 for draining. After ozonization, where the contaminants are neutralized and flocculated as particulate matter, the wastewater to be cleaned can be pumped from the spherical ozonizing container 11 with a siphoning pump 29 through a pump line 28 and transferred to a particle separation device 10a or 30a, as illustrated in
In the embodiment according to
The stator 39 has a rotor space which is open towards the bottom; the ozone feed line 23 terminates in the rotor space. The medium to be cleaned, namely wastewater or liquid manure from farming, it is not a homogeneous material and can contain solid lumped-together particulate matter islands of different size which either do not react at all with the ozone or only insufficiently.
The medium to be cleaned is therefore homogenized by the rotor 40 which rapidly rotates in the stator 39, while simultaneously ozone is introduced through the ozone feed line 23. The rotor 40 rotates with approximately 250 and 500 RPM, producing shearing forces high enough to dissolve and intermix the particulate matter islands.
The particulate separating device 10a illustrated in
After filling, the ozonized wastewater is set into a rapid rotary motion by the centrifugal drive 32. All process steps inside the material separating container 30 can be monitored with an external measuring station 34.
As a result of the rotation, the flocculated suspended particles are centrifuged radially outward, where they are captured in capture bags 35 and 35a and collected. The capture bags 35 and 35a, respectively, are distributed along the entire circumference of the truncated-cone-shaped material separating container 30. The capture bags 35 are located at the top in the region of the larger diameter and are provided with coarse sieves 36. The larger, because heavier particulate matter is transported outwardly first and farther during centrifuging, and collected in the upper catch bags 35 arranged in the region of the larger diameter.
The smaller and lighter particulate matter is moved outwardly less far and collected in the catch bags 35a which are provided underneath in the region of the small diameter. The lower catch bags 35a are here provided with fine sieves 36a. The flocculated particulate matter is fractioned due to the truncated-cone-shaped design of the material separating container 30.
After all particulate matter is removed from the cleaned wastewater, the cleaned wastewater can be disposed of through a drain valve 33a and, for example, returned again to the cleaning flow loop.
The cleaned wastewater can also be transported to an additional water treatment system where it is sufficiently cleaned and disinfected so that it can be used again, for example on a ship, as process water and/or drinking water.
The particulate matter captured in the capture bags 35 and 35a may be discharged, for example, into a storage space 37 provided in the housing 31 and intermediately stored until the time of final disposal. To facilitate emptying the catch bags 35 and 35a, the coarse sieves 36 and the fine sieves 36a are constructed as discharge flaps and can be opened discontinuously. The collected solids can be transported to an unillustrated incinerator for disposal.
The conventional material separating device 30a illustrated in
An inlet valve 42 is arranged in the region of the cylindrical drum part 43. The cylindrical drum part transitions into the conical drum part 44 as a single piece.
A feed screw 45, which is operatively connected with the interior surface of the conical drum part 44, is arranged inside the receiving drum 46. The receiving drum 46 can be set into a rapid rotation by a drum drive 47, for example by an unillustrated electric motor. The rotation speed which is important for the material separation can be varied with a control drive 48.
After the material has been separated, the fluid can be drained through a drain valve 49. The relatively dry, solid suspended particles that were separated from the medium to be cleaned can be removed through a solid matter discharge port 50.
10 Cleaning device
10
a Material separating device
11 Spherical ozonizing container
11
a Inlet valve
12 Welding neck flange
13 Manhole
14 Blind flange
15 Agitator drive
16 Agitator shaft
17 Hollow-cylindrical fixture
18 Agitator propeller, top
19 Agitator propeller, bottom
20 Flow
21 Funnel insert
22 Ring-shaped line
23 Ozone feed line
24 Ozone generator
25 Discharge fixture
26 Control fixture
27 Container support
28 Pump line
29 Siphoning pump
30 Material separating container, upright
30
a Material separating container, horizontal
31 Upright housing
31
a Horizontal housing
32 Centrifuge drive
33 Inlet valve
33
a Outlet valve
34 Measuring station
35 Upper catch bag
35
a Lower catch bag
36 Coarse sieve
36
a Fine sieve
37 Storage space
38 Bearing flange
39 Stator
40 Rotor
41 Rotor space
42 Inlet valve
43 Cylindrical drum part
44 Conical drum part
45 Feed screw
46 Receiving drum
47 Drum drive
48 Control drive
49 Discharge valve
50 Solid matter discharge port
Number | Date | Country | Kind |
---|---|---|---|
10 2008 050 223.5 | Oct 2008 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/EP2009/007300 | 10/7/2009 | WO | 00 | 4/6/2011 |