Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1997-10-03
1999-08-10
Lithgow, Thomas M.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210805, 210806, 210196, 2101951, 2102212, 210295, C02F 124
Patent
active
059354461
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for purifying water, for example water used for forming a water curtain of a wet spray wall in paint spray and/or glue processing booths, wet dust removal plants and the like, whereby the water to be purified is caught in a receptacle and the water is sucked out under the surface of the water present in said receptacle, mixed with air and introduced into a basin at the bottom side of said basin, wherein the water mixed with air is introduced into a basin which widens in upward direction, and that contaminations floating on the surface of the water present in said basin is pushed towards an outlet disposed near one side of said basin by means of a pusher, whilst the water flows out on the opposite side of the basin via an overflow, which is screened at its side facing the outlet for the contaminations by a partition extending slightly below the water level in the basin.
From DE-U-9313340 there could be derived such a method wherein the water is passed through a basin comprising a lower conical part, a cylindrical middle part and a widening upper part whereby in the bath there have not been provided means obstructing the upward flow of the water.
U.S. Pat No. 4,610,785 discloses a method and a device of this kind, wherein the water is injected through a pipe in the longitudinal direction of a trough-shaped bottom end of the basin, in such a manner that the water collides with a partition disposed in the basin at some distance from the end of said pipe, as a result of which the water is imparted a turbulent motion about an imaginary axis extending horizontally and perpendicularly to the longitudinal direction of said pipe. The discharge of the water takes place through a discharge channel located on one side of the basin, which is separated from the other part of the basin by a partition, the bottom edge of said partition being located a short distance above the supply pipe.
In practise it has become apparant the primarily heavier particles, the slightly larger, more crystalline particles, will thereby float on the water surface, whilst the lighter particles, the smaller, more colloidal particles, are carried towards the outlet by the water as a result of the strong turbulent flow of the water, so that an adequate purification of the water casu quo separation of particles is not obtained.
From EP-A-0,065,382 a method and a device for purifying water can be derived wherein part of the contaminated water is introduced in a basin near the upper side of said basin and another part of the water is introduced into said basin near the bottom side thereof. The contaminations floating on the water surface are thereby swept out of the basin near one side thereof, whilst a discharge pipe for the discharge of water from the basin is connected to the basin near the same side thereof. Also here the introduction of contaminated water in two places causes a strong turbulence of the water in the basin, as a result of which an adequate separation in particular of light particles from the water can not be effected. Furthermore the aimed-at separation between liquid and particles is made more difficult because the discharge of water from the basin and the discharge of particles floating on the water take place in places located in close proximity to each other.
The method according the invention is characterised in that in the lowermost part of the basin which widens up along the entire length of its height the water is passed through perforated plates being disposed one above the other and after passing said screens the water is passed into an upper part of the basin where the increase of the cross-section measured in a horizontal direction per unit of height is greater as in the lowermost part of the basin.
When using a method according to the invention a very gradual rising of the air divided into fine air bubbles in the liquid is obtained, as a result of which contaminations are effectively driven towards the surface, whereby, as has become apparent in practice, also contaminations in the fo
REFERENCES:
patent: 3012670 (1961-12-01), Ziemer
patent: 4431531 (1984-02-01), Hollingsworth
patent: 4610785 (1986-09-01), Russell
patent: 4851036 (1989-07-01), Anthes
Lithgow Thomas M.
Lo Elaine H.
MacPherson Alan H.
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