Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1995-04-11
1997-09-09
Drodge, Joseph W.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
134111, 134123, 210805, 210806, 417151, B01D 1712
Patent
active
056652453
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a process and a system for purifying waste water, in particular waste water from motor vehicle washing installations.
In order to dispose of the waste water generated by motor vehicle washing installations and polluted by detergents and oil or other residues, this waste water is collected in sludge receiving tanks before being drained into a sewer via an oil separator. Analysis of the waste water drained off into the sewer has however shown that the degree of purification frequently fails to achieve the required standard. Furthermore, the water consumption is undesirably high, since the water used cannot generally be recycled.
From DE 40 40 007 A1, a self-service motor vehicle washing installation is known, in which the resulting waste water is purified both by mechanical equipment and by chemical substances such as a flocculant. The waste water to be purified then flows through quite bulky reservoirs, whereby the disadvantage arises, that bacterial cultures can occur, which lead to sludge production.
A process for purifying waste water from motor vehicle washing installations is known from EP 0 436 090 A1, in which purified water is mixed with purification-active substances such as flocculant and air.
The object underlying the present invention is to develop a system of the type described above or a process such that waste water purification to a sufficient extent is achieved without the need for the usual sludge receiving tanks on the one hand and for expensive sewage treatment systems on the other. In addition, a compact design and problem-free operation should be possible, permitting installation in existing washing installations too.
In accordance with the invention, the waste water to be purified is conveyed through the system by a water jet pump whose water seal is the purified or pre-purified waste water or the least pre-purified waste water.
The negative pressure generated by the water jet pump creates a vacuum which sucks the waster water collected in the first container, and that can come from a washing installation, into the third container, which in turn can be automatically emptied. To this end, the container can be closable at the bottom by a sealing element designed as a cover provided with a counterweight, said element opening automatically upon attaining a certain filling quantity or filling level due to the prevailing hydrostatic pressure, and after emptying--caused by the counterweight--automatically closing the container, with infiltrated air being sucked in during emptying. Consequently, it can be chosen as a construction which is described in DE 30 32 503 C2.
Intake of waste water can be controlled so that the sucked in water is first stabilized, for example, for two minutes, before being drained off over a period of preferably 15 seconds.
In the separator downstream of the third container, the sludge, the oil and the water are separated, with the oil being separated by an oil separator and the sludge being drawn off by a sludge trap on the bottom and passed to a sludge container. The sludge is also conveyed by the negative pressure generated by the water jet pump.
To purify the sludge, the latter is rinsed with purified water that can be taken from a receiving container disposed underneath an overflow of the second container. The water collected in the sludge container for purifying the sludge is in turn sucked by the negative pressure or vacuum into the automatically emptying third container.
To render the sand suitable for dumping, the sludge container is evacuated after water removal, while at the same time a heater can be switched on to heat the sludge to a temperature of 30.degree.-40.degree.C., thereby ensuring evaporation of the residual water. The sludge thus purified and dried can then be safely dumped. The sludge container is also evacuated by the negative pressure or vacuum generated by the water jet pump.
Alternatively, it is possible simply to dry the sludge container without further rinsing, by building up in the sludge container a
REFERENCES:
patent: 3810544 (1974-05-01), Armstrong et al.
patent: 3923658 (1975-12-01), Lancaster
patent: 4104164 (1978-08-01), Chelton
patent: 4652368 (1987-03-01), Ennis et al.
patent: 5160430 (1992-11-01), Gasser et al.
patent: 5160605 (1992-11-01), Noestheden
Crema Erhard
Kloss Harald
BL Patentverwaltungs und Vertriebs GmbH
Drodge Joseph W.
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