Liquid purification or separation – Particulate material type separator – e.g. – ion exchange or... – With rehabilitation means
Patent
1983-04-04
1984-11-13
Cintins, Ivars
Liquid purification or separation
Particulate material type separator, e.g., ion exchange or...
With rehabilitation means
210271, B01D 2324
Patent
active
044824572
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for filtering a suspension or emulsion. The invention especially relates to an apparatus for continuous filtering of suspensions and emulsions in the purification of waste water, but is not restricted to this use only.
A method and an apparatus for filtering a suspension or emulsion are described in U.S. Pat. Nos. 4,126,546 and 4,197,201. According to these patents, the suspension or emulsion to be filtered is introduced somewhat above the bottom of a bed of a particulate filter medium and is led upwards through the filter bed, suspended and emulsified material being separated and remaining in the bed while the purified filtrate is recovered from a liquid layer formed above the upper surface of the filter bed. The filter bed is enclosed in a container having a substantially cylindrical shape and the lower portion of which is made substantially conical. A filter medium which has been contaminated by taking up the separated material is recovered from the downwardly directed container end and is moved to the surface of the liquid layer above the filter bed where it is led downwards in countercurrent to a part of the purified filtrate and is washed in this way. The washed filter medium is then distributed over the surface of the filter bed so that the filter medium will circulate, i.e. it sinks into the bed at the same time as it gets into contact with an ever more contaminated suspension or emulsion to be filtered, and is finally recycled to the upper part of the liquid phase for repeated washing. The filtrate contaminated by the washing of the filter medium is kept separated from the other, purified filtrate and is removed separately. In an embodiment shown, the contaminated filter medium is conveyed upwards through a pipe extending through the filter bed by means of air which is introduced at the lower part of the pipe so that the filter medium is moved upwards through a mammoth pump effect.
The known filtering apparatus has a number of excellent advantages. Thus, no movable parts within the filtering apparatus as such are required, and an extremely good filtering effect is obtained. However, the apparatus also has certain shortcomings. Thus, due to its essentially cylindrical shape, the available floor space is inefficiently utilized, and therefore its capacity will be unnecessarily restricted. Furthermore, its use is restricted to merely filtration of such suspensions and emulsions where the contaminated filter medium can be purified merely by simple washing with a purified liquid phase, and no other treatment of the filter medium is possible. In certain cases, e.g. in purification of oil-containing water, a further treatment of the filter medium may be necessary, however, and sometimes it is desired to recover the suspended or emulsified material removed from the liquid phase. At times, it is also desirable to carry out washing at an elevated temperature, and this is not possible with the previously known apparatus.
The above-mentioned disadvantages are eliminated by the present invention, and a filtering apparatus for suspensions or emulsions is provided where the embodiment of the apparatus can be made more flexible, and the available space can be utilized better in this way so that the capacity can be increased. The treatment of the contaminated filter medium can also be varied to a considerable extent so that the apparatus will be more generally useful.
According to the invention, there is provided an apparatus for filtering a suspension or emulsion and comprising a bed of a particulate filter material arranged in a container, one or more inlets for the suspension or emulsion to be filtered, arranged at the lower part of the bed, means arranged above the bed for the removal of filtrate, elevator means for conveying filter medium contaminated by the filtration from the lower part of the bed to means for washing or other treatment of the filter medium, and means for recycling treated filter medium to the upper part of the bed, the invention being characterized in
REFERENCES:
patent: 628987 (1899-07-01), Maignen
patent: 2182095 (1939-12-01), Pruyn
patent: 2287983 (1942-06-01), Gavett
patent: 2315254 (1943-03-01), Fraser
patent: 2396769 (1946-03-01), Asch
Carex Process AB
Cintins Ivars
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