Gas separation: apparatus – Degasifying means for liquid – With control means responsive to sensed condition
Patent
1997-02-11
1999-01-12
Smith, Duane S.
Gas separation: apparatus
Degasifying means for liquid
With control means responsive to sensed condition
55340, 95262, 96206, 96220, B01D 1900
Patent
active
058580719
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a water-purifying apparatus, which is especially adapted to reduce the radon content of radon-contaminated water and which comprises a reactor tank for treating the radon-contaminated water, a radon-releasing means arranged in the reactor tank to receive and treat water from a first pump adapted to supply water from a source of water containing radon-contaminated water, the water from the radon-releasing means accumulating in the reactor tank, an inlet duct extending between the first pump and the radon-releasing means, an outlet duct from the reactor tank, said outlet duct being connected to a water consumption system, and a radon-gas outlet from the reactor tank.
U.S. Pat. No. 4,371,383 teaches a radon-removal system intended to be arranged between a source of water and a pressure storage tank. According to the US specification, this system succeeds in removing 80-90% of the radon by aerating the water, but nevertheless does not possess the efficiency required to achieve results below the Swedish maximum permissible value of 500 Bq/l, if the contaminated water has a radon content of 5000 Bq/l or more.
SE 464,712 discloses a water-purifying apparatus which effectively removes, inter alia, iron and manganese from water. The Swedish technique is based on effective aeration of the water, a technique that has proved to be useful also when it comes to removing radon. However, radon-contaminated wells are often fairly deep (70-100 m), which means that the amount of water lifted is rather small, for instance 5 l/min. A much greater flow rate of at least 25 l/min is required for effective aeration of the water. When the flow rate is too small, the aeration is less effective, which of course has an adverse effect on the removal of radon.
SUMMARY OF THE INVENTION
The main object of this invention is to obviate the inconveniences of the prior-art radon-removal system by providing a water-purifying apparatus for separating radon from water, which is equally effective regardless of the amount of water supplied by the well pump.
Another object of the invention is to provide a water-purifying apparatus that does not take up much space and is easy to set up.
According to the invention, these objects are achieved by an apparatus which is of the type described by way of introduction and whose distinctive features are recited in the characterising clauses of the appended claims.
The water-purifying apparatus according to the invention has the advantage of being inexpensive to set up. Since it can be adapted to all types of wells as well as to the amount of water supplied from each well, the water-purifying apparatus can be set up between an existing pump and the pressure storage tank normally provided. Neither the pump nor any other equipment need be exchanged.
BRIEF DESCRIPTION OF THE DRAWINGS
A few embodiments of the invention will now be described in more detail with reference to the accompanying drawings, in which
FIG. 1 is a schematic view of a first embodiment of the radon-separating apparatus according to the invention;
FIG. 2 is a perspective view of the upper part of the radon-separating apparatus according to the invention, illustrating how various components can be mounted on the lid of the tank; and
FIG. 3 is a schematic view of a second embodiment of the radon-separating apparatus according to the invention.
DETAILED DESCRIPTION
Thus, FIG. 1 shows a water-purifying apparatus or radon-separating apparatus according to the invention. This radon-separating apparatus comprises a reactor tank 1, the construction of which will be described in more detail below. A radon-releasing means 2 is mounted in the reactor tank. An inlet duct 4 extends between a well containing radon-contaminated water and the radon-releasing means. A well pump 3 is connected in the inlet duct, and a combined circulation/outlet pump 10 is arranged in the tank and connected to the inlet duct by means of a duct 5, a solenoid valve 8 which is closed in the absence of current, and a T-
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Libradon AB
Smith Duane S.
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