Liquid purification or separation – Structural installation – Separator ancillary to storage tank
Patent
1995-07-24
1997-02-11
Upton, Christopher
Liquid purification or separation
Structural installation
Separator ancillary to storage tank
2102571, 210262, 210534, 210540, B01D 2100
Patent
active
056017065
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an apparatus for treating sewage or waste water. The apparatus also includes an aggregate separator. For conservation reason and, in particular, from economical considerations, apparatuses for reprocessing residual concrete are used in ever increasing number. They are used as in concrete production so in concrete transportation operations. These apparatuses should prevent the concrete residues and/or the cement slurry from penetrating into open sewerage and/or from regular accumulation in greater or lesser extent somewhere at constructional sites. Such apparatuses retrieve sand or pebbles contained in the concrete residue and provide for re-use of the cement slurry-water, contained in the cement residue, for production of a new concrete, and therefore, these materials are subjected to recycling.
STATE OF THE ART
Utility model DE-G 9100177 discloses a washing trough for a beton residue. This washing trough serves for reprocessing of the beton residue. The trough includes a chamber for a preliminary wash and a chamber for fine wash arranged one after another in the flow direction in a reservoir-like housing. Fresh water is supplied in the trough in a direction opposite to the direction of flow of material, so that optimal washing results are achieved. At the end of the fine wash chamber, sand and pebbles, extracted from the beton residue, are loaded, in waterfall manner, onto a screw conveyor with a bucket wheel and are carried away from the washing trough. The conveyor trough of the screw conveyor is formed of a high wear-resistant plastic material so that tilting of sand and pebble components between the conveyor screw and the surrounding housing and thereby jamming of the particles between separate structural parts is not possible. Thereby, a reliable transportation of the sand and pebble pieces out of the washing trough becomes possible. By using the plastic band, the conveyor screw can be operated very quietly.
Such washing troughs, because of their overall concept, are particularly suitable for operations in which a relatively large amount of a concrete residue is produced. An example of such an operation is transportation of concrete, in which often about 1/4 m.sup.3 and more of the concrete residue remains in the concrete transporting vehicle when it returns from its delivery run. Thereby, during a day period, a relatively large amount of the concrete residue is obtained.
However, from the economical point of view, such washing troughs are not very efficient when relatively small amount of the concrete residue in comparison with the amount of water, remains. Such is the case during production of concrete at concrete plants. There, the amount of water which is used, e.g., for rinsing during the production of a concrete batch and which, as a result, is contaminated with cement slurry, is very large in comparison with the concrete residue. The use of conventional washing troughs is generally possible, and they permit to achieve the same technical advantages as with recycling of the residual concrete, however, the investment costs are relatively high, and operation of this washing troughs is not particularly effective.
Utility model DE-G 92 08 671 discloses an apparatus of the type, discussed at the beginning, suitable for treating waste water and which further includes an aggregate separator. This apparatus includes a waste water reservoir in which a device for circulating the waste water, which fills the reservoir, is provided. Above the level of the waste water, which fills the reservoir, there is provided a replenishing chamber for the aggregate-containing waste water. This apparatus is particularly suitable for production industry where regularly a large amount of waste water relatively to the produced concrete residue is obtained. Here, the waste water means water which is contaminated with cement slurry. The sand and pebble parts, contained in the concrete residue, do not accumulate in the waste water reservoir but are carried away from the replenishing
REFERENCES:
patent: 4927543 (1990-05-01), Bablon et al.
patent: 5244573 (1993-09-01), Horisawa
patent: 5250196 (1993-10-01), Bosch
Riker, Rudolf "New Methods for Reprocessing Leftover and Returned Concrete" from Betonwerk und Fertigteil Technik vol. 49, No. 9 Sep. 1983 pp. 569-573 .
Brenner Horst
Upton Christopher
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