Liquid purification or separation – Processes – Treatment by living organism
Patent
1982-02-18
1985-03-19
Castel, Benoit
Liquid purification or separation
Processes
Treatment by living organism
210608, 210627, 210628, C02F 326
Patent
active
045058202
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for cleaning waste water, which makes use of a device comprising at least one multireactor, which multireactor consists of a cylindrical container, the axis of which is positioned vertically, and a rotatable central pipe coaxially positioned within the container.
Such a device is generally known and is practically used on a large scale.
In order to improve the biological cleaning of the waste water, pure oxygen or an oxygen containing gas, hereafter called oxygen gas, is supplied. The problem is that the oxygen is bubbling up relatively fast through the waste water to be cleaned and only a small part of the oxygen gas supplied is used in the biological cleaning.
It is an object of the invention to provide a method as hereinbefore defined wherein the oxygen gas is more effectively used.
According to the invention this object is achieved in that in each multireactor there are at least two bioreactors positioned above one another, and above said bioreactors there is at least one separation chamber, in that two adjacent bioreactors are separated from each other by means of a horizontal mainly annular partition wall, the outer edge thereof being connected to the inner wall of the container, and the inner diameter being somewhat larger than the outer diameter of the pipe, and in that the supply of oxygen gas is provided in the lowest bioreactor of each multireactor.
Due to the presence of the annular partition walls the bubbling up of the oxygen gas is delayed considerably, whereby it can be used more effectively. Besides by a suitable choice of the form and position of the partition wall the upward directed movement of the oxygen gas can be used for mixing the oxygen gas and the waste water.
Other characteristics and advantages will become clear from the following description, reference being made to the accompanying drawings, wherein
FIG. 1 is a schematic cross section of a first multireactor, as it can be provided in a waste water cleaning system according to the invention,
FIG. 2 is a schematic cross section of a second multireactor, as it can be provided in the cleaning system,
FIG. 3 is a schematic cross section of a third aultireactor, as it can be applied in a device according to the invention, and
FIG. 4 is a diagram of a complete system according to the invention.
As represented in FIG. 1 the first multireactor comprises a cylindrical container 20, comprising a cylinder wall 21, a bottom plate 22 and an upper wall 23. With its bottom plate 22 the container 20 is resting on a foundation, not shown, in such a way that the cylinder wall 21 is positioned vertically. Coaxially with the cylinder wall 21 there is provided a hollow pipe 24 in the container 20, the bottom end of said pipe being rotatably supported by the bottom plate 22. This bottom end of the pipe 24 is constituted by a wall portion 25 having the form of a truncated cone cooperating with a conical part 26 connected to the bottom plate 22. A number of openings is provided in the wall portion 25. The upper end of the pipe 24 is also constituted by a wall portion 27 having the form of a truncated cone, which wall portion 27 is also provided with openings. A stub shaft 28 is connected with the wall portion 27, and extends through an opening in the upper wall 23, and outside the container 20 it is connected with an electromotor 29 supported by the upper wall 23. The dimensions of the parts are chosen in such a way that the wall portion 25 is not touching the conical part 26, but that the pipe 24 is mainly supported by the support of the motor 29. Around the upper end of the pipe 24 a funnel shaped plate 35 is provided, whereby the liquid contained therein is drained away through the openings in the wall portion 25. Waste water is added via pipe 19.
In the container 20 a number of horizontally positioned annular partition plates is provided, which either are connected to the inner side of the cylinder wall 21 or to the pipe 24, thereby dividing the container into a number of reaction spaces. In the lowest part of th
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patent: 4212949 (1980-07-01), Kozhemyakin et al.
patent: 4286065 (1981-08-01), Kaluniants et al.
patent: 4350588 (1982-09-01), Tsubota
Castel Benoit
Johnston Albert C.
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