Gas and liquid contact apparatus – Contact devices – Injector type
Patent
1989-05-08
1991-07-16
Miles, Tim
Gas and liquid contact apparatus
Contact devices
Injector type
261123, B01F 304
Patent
active
050323245
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to the diffusers used in tanks for the aerobic purification of waste waters.
The known diffusers are made in such a way so as to disperse the air blown into pipes running across the bottom of tanks for aerobic treatment filled with waste waters.
Said diffusers are located at each air exit from the above mentioned pipes. These diffusers have however a reduced efficiency because the air is distributed in bubbles having a dimension that is unsuitable for obtaining a uniform dispersion and efficient transfer of the oxygen to the liquid; in fact, the bubbles having big dimensions reach the surface before an effective oxygen transfer to the waters to be treated takes place.
In order to improve the efficiency of the diffusers, U.S. Pat. No. 3,852,384 foresees that the blown-in air bubbles be forced to follow a not rectilinear path, in particular a spiral path, that increases the bubbles stay time in the waters to be treated. The spiral path is obtained by collecting the blown-in air in vertical cylindrical elements where one or more helical baffles are provided so as to act as guides for the bubbles. In this way the air and water mixture follows a spiral path that prolongs the interface contact between bubbles and liquid. The aforesaid cylindrical elements are placed above the pipes running horizontally, near the bottom of the tank, these pipes being horizontal and perforated in the lower part for the passage of the blown-in air. Nevertheless, the yield has not reached optimum levels.
The object of the present invention is that of improving the yield of the diffusers so as to obtain finely dispersed bubbles creating an efficacious transfer of the oxygen to the waters to be treated.
This aim is achieved by providing at the base and top of the cylindrical body, comprising at its interior one or more helical sections, a sparger and a distributor respectively. The sparger, or dispersing means consists of a hopper having the major base provided with tongues that radially depart from its periphery in order to catch the bubbles coming out from a horizontal pipe running near the bottom of the tank and to cut the mass of bubbles creating an additional turbulence. The minor base of the sparger is provided with an edge protruding towards the outside and openings for the passage of tie rods for the anchorage of the diffuser.
The minor base is circumferentially provided with a seat for receiving the end of the cylindrical body which is preferably formed by a plurality of sections welded together.
The distributor placed at the top of the cylindrical element comprises a truncated cone shaped portion with the major base open and the minor base provided with openings radially distributed. Moreover, the lateral surface is provided with further slots for the outlet of bubbles.
Preferably, the minor base consists of a tapered element with the apex of the cone turned towards the inside of the diffuser.
The distributor is fixed to the cylindrical body by means of another hopper quite similar to the one of the sparger, with the major base facing upwards so that this hopper is capable of helping the discharge of the air-water mixture.
The described diffusers are uniformly distributed at the bottom of the tank and anchored to supports, in the shape of concrete blocks, preferably by means of tie rods fixed with bolts screwed on threaded rods protruding from the concrete blocks, a perforated plate that is inserted on the aforesaid rods being foreseen at the lower end of the tie rod. At the top, the tie rods are fixed on the protruding edge of the second sparger that surrounds the distributor, preferably with nuts screwn on their threaded ends by interposing suitable washers.
The present invention according to a preferred but not limitative embodiment, is shown in the enclosed drawings, in which:
FIG. 1 shows a partially sectioned side view of the diffuser anchored at its support;
FIG. 2 shows a side view of the sparger;
FIG. 3 shows a view of the sparger taken along line 3--3 of FIG. 2;
FIG. 4 shows a view of t
REFERENCES:
patent: 2353195 (1944-07-01), Sims
patent: 2967399 (1961-01-01), Laurie
patent: 3148509 (1964-09-01), Laurie
patent: 3452966 (1969-07-01), Smolski
patent: 3628775 (1971-12-01), McConnell
patent: 3852384 (1974-12-01), Bearden
patent: 4051035 (1977-09-01), Boschen et al.
patent: 4138335 (1979-02-01), Murphy
patent: 4504388 (1985-03-01), Desbos et al.
patent: 4569757 (1986-02-01), Moore
The American College Dictionary, Apr. 1982, p. 1171.
LandOfFree
High yield air diffuser for tanks used in the aerobic treatment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High yield air diffuser for tanks used in the aerobic treatment , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High yield air diffuser for tanks used in the aerobic treatment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-129741