Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
1997-06-30
2001-05-01
Popovics, Robert (Department: 1723)
Liquid purification or separation
Processes
Treatment by living organism
C210S629000, C210S188000, C210S195300, C210S219000, C210S220000, C210S532100
Reexamination Certificate
active
06224772
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a waste water continuous purification process, as well as to a waste water continuous purification plant system.
2. Related Art
Known waste water purification processes use active sludge. The mixture of the active sludge is held in suspension in the treated wastes and aerated. After leaving the aeration tanks the aerated mixture is directed to a secondary sedimentation tank in which sedimentation is continued by sludge precipitation. The precipitated sludge is used once more in the purification process, and the decanted liquid directed to a receptacle as the cleaned waste water. The active sludge recirculated in the purification process maintains its ability to clean new quantities of raw wastes which are introduced continuously or in batches.
Purification processes of this kind, especially if carried out in aeration chambers formed as deep tanks (e.g. deeper than 5 m), or in multi-storey processes, have certain disadvantages. Because active sludge has a relatively low sedimentation capacity, coupled with the disadvantageous feature of sludge flocs coming up to the surface during the purification process, it is virtually impossible to carry out the sedimentation in the secondary sedimentation tank.
In order to eliminate this effect, existing waste treatment processes use an additional operation consisting of flocculating and mixing the aerated wastes before their flow into the sedimentation tank. However, this causes the treatment process to be lengthy, and to frequently run in a chimerical fashion.
Flocs of the active sludge generated during the known waste treatment processes have undesirable features resulting in limited effectiveness and capacity of these processes.
SUMMARY OF THE INVENTION
In accordance with a preferred embodiment of the invention, there is provided a waste water purification process, comprising the steps of:
(a) mixing waste water together with active sludge;
(b) aerating the resultant mixture in a tank;
(c) discharging the aerated mixture into a secondary sedimentation tank while degassing; and
(d) recovering the sludge in said secondary tank,
wherein said recovered sludge in step (d) is recirculated as active sludge in step (a), and wherein said aerated mixture of waste in step (b) is brought into a state of turbulent flow directly before being vacuum degassed and before being discharged into said secondary sedimentation tank.
In accordance with another preferred embodiment of the invention, there is provided a waste water purification plant system for continuous waste water treatment, comprising:
an aeration tank for aerating a mixture of wastes and active sludge, said aeration tank having a separated chamber (
7
);
a secondary sedimentation tank (
10
) having a separated chamber (
8
);
an inverted U-shaped pipe conduit member comprising a supply collecting pipe (
2
) with lower and upper ends, a discharge collecting pipe (
3
) with lower and upper ends, and a segment connecting the upper ends of said supply and discharging collecting pipes, said segment having a cross-section greater than that of said supply and discharging collecting pipes, wherein said lower end of supply collecting pipe (
2
) is submerged in said aeration tank or its separated chamber (
7
), and said lower end of discharge collecting pipe (
3
) is submerged in said secondary sedimentation tank (
10
) or its separated chamber (
8
) such that said inverted U-shaped pipe conduit member provides a one-way, recirculating connection between said aeration tank or its separated chamber (
7
) and said secondary sedimentation tank (
10
) or its separated chamber (
8
);
a vacuum degassing means (
1
) disposed within said segment of said inverted U-shaped pipe conduit member, said vacuum degassing means (
1
) comprising an intermediate chamber (
4
) having a gas suction chamber (
5
) contained therein; and
means (
6
) for generating a turbulent flow of said aerated mixture of waste.
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Yutaka, O., “Continuous Vacuum Degassing Apparatus for Molten Copper,”Patent Abstrats of Japan 13(399):Abstract of JP Publication No. 1142016 (Sep. 5, 1989).
Popovics Robert
Sterne Kessler Goldstein & Fox P.L.L.C.
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