Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – For radioactive reactant or product
Reexamination Certificate
1998-11-02
2001-09-18
Knode, Marian C. (Department: 1764)
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
For radioactive reactant or product
C422S184100, C261S076000, C261SDIG007
Reexamination Certificate
active
06290917
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an apparatus for sewage purifying treatment by improving the dissolving efficiency of oxygen. This is accomplished by jetting into sewage a pressurized water current and micronized bubbles made by the synergistic effect of the pressurized water current and air current which is introduced as it is spiralling from the outer circumferential part of the pressurized water current.
2. Description of Prior Art
Conventionally, drainage chiefly from households, dead leaves and other organic substance flow into enclosed water areas, such as culture ponds, reservoirs, scenic ponds provided at parks, golf courses, etc. or open water areas, such as rivers, ports and harbors. Such inflows stagnate, become rotten and emit offensive odors, causing malodor pollution to nearby residents. Moreover, water quality deteriorates because of substances which flow in and stagnates, with the resultant growth of water-bloom or the like. In the case of culture ponds, it is important to aim at purification of water quality so as to prevent fish disease, promote growth of cultured fish and improve quality of such fish. In the case of agricultural reservoirs, it has been ascertained that deterioration of water quality adversely affects growth of the crops.
The conventional method of purifying the water quality of culture ponds, scenic ponds, rivers, etc., is to use the jet type aeration system, an agitation system whereby an agitator is provided on the surface of a pond to agitate the surface of the water to bring both the water and air into contact and an air blowing system whereby air flows into the water so as to form micro-bubbles. All of these systems aim at improving of the dissolved oxygen content.
In the case of the conventional water agitating and aerating machine, however, a screw is arranged on the surface or below the surface of the water for supplying and mixing the air into the water. According to this conventional machine, it is possible to agitate and aerate the waste water on the surface part but it is difficult to agitate and aerate the waste which is below the surface or which is away from an agitator. Moreover, it is impossible for this machine to purify sludge sedimented on the bottom of a pond or the like. Thus, there is a limit in the range and ability of agitation and aeration for the conventional machine.
Since the conventional machine has a mechanically driven part which is to be set under the surface of the water or at the place which is subject to infiltration of the water, such driven part easily wears or mechanically fails due to impurities contained in the water. Thus, periodical inspection and maintenance are required.
It has been known that in the case of forming air taken in the water into bubbles, the more the bubbles are micronized, the more the dissolved oxygen content is improved. However, in the method of agitating the water and forming bubbles by revolution of a screw, there is a limit in the micronization of bubbles and increased power is required. In particular, a commercial power source equipment is required on the spot.
In the case of the air suction method, when the aeration is stopped impurities penetrate into the nozzle which is always under water due to water pressure and consequently the nozzle is clogged. Thus, repetition of aeration operations and stoppage can cause clogging of the nozzle and reduces the aeration effect.
In the case of stock farmers, the sewage purifying treatment apparatus of conventional type is too expensive and it is customary to store animal waste from livestock (pigs, cows, etc.) temporarily in sewage reservoirs dugout and then spread animal waste over a field or the like periodically. However, spreading of such unfermented animal waste is not suitable for growth of agricultural products and it is required to leave fields as they are until animal waste ferments to such an extent that it can be absorbed by plants in fields as fertilizer. Moreover, offensive odors emitted from sewage reservoirs and from spread waste cause the pollution problem.
SUMMARY OF THE INVENTION
In view of the above, the present invention provides a technique to improve the above-mentioned conventional sewage purifying facilities. For this purpose, the present invention provides an apparatus for sewage purifying treatment which does not require a mechanism driven part under water. Instead, the apparatus has a mechanism such that the air is sucked in and turned into a spiral air flow by utilizing high-speed water flow supplied in a cylindrical nozzle such that bubbles are micronized, whereupon air mixed water containing such micronized bubbles and sufficiently dissolved oxygen is discharged into the waste water for carrying out aeration effectively in a wide range.
In order to obtain the above object, the apparatus for sewage purifying treatment according to the present invention is characterized in that it is composed of a suction nozzle member which supplies pressurized water from its end portion, an intermediate nozzle member, an injection nozzle member (each of these members has a water passage within, is arranged on the same axial center, and is connected to each other), an air introducing nozzle formed between the nozzle members, an outer casing arranged in such a fashion that an air introducing chamber is formed at the outer circumferential part of the intermediate nozzle member (the air introducing chamber and the air introducing nozzle communicate with each other through the medium of an air introducing hole), a pressurized water supply pipe connected to an end of the suction nozzle member and an air supply pipe (for supplying the air to the air introducing chamber) connected to the outer casing.
In the apparatus for sewage purifying treatment mentioned above, the air is introduced by utilizing negative pressure which is generated in the cylindrical nozzle member by pressurized water flowing at high speed in the water passage and bubbles are micronized by the high-speed water flow. This process is repeated at plural stages and air-mixed water thus obtained is discharged into a waste water area. Therefore, according to the present invention, micronization of bubbles by high-speed water flow is provided and dissolved oxygen content is heightened. Aeration treatment can be extended to a distance in the waste water area and even raw sewage of livestock having higher viscosity than waste water can be treated.
A suction nozzle member, an intermediate nozzle member and an injection nozzle member are arranged on the same axial center and are connected to each other. These members have at the inner circumferential surface thereof a water passage and the inside diameters of the water passages are enlarged in order from the suction nozzle member at the upstream side to the intermediate nozzle member and the injection nozzle member at the downstream side. By this composition, negative pressure is generated at the downstream side of the nozzle members connecting position, the air can be introduced smoothly from an air introducing nozzle formed at the nozzle members connecting position and bubbles are micronized by high-speed water current flowing in the water passage and are mixed well with the water current.
A groove for micronizing coarse bubbles is formed at the downstream position from the air introducing nozzles (excepting the terminal air introducing nozzle). By this composition, coarse bubbles (not yet crushed) of the air introduced at the upstream side are easily micronized by turbulent flow generated by a groove formed in the direction intersecting the high-speed water flow at the inner circumferential surface of the water passage.
An air introducing nozzle of a ring slit-shape is formed between nozzle members. It is designed so that this air introducing nozzle communicates with the air introducing chamber through the medium of an air introducing hole made in tangential direction. By this composition, the air introduced in the water passage turns to spiral flow and is heightened i
Keschner Irving
Knode Marian C.
Ohorodnik Susan
Une Shunji
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