Liquid purification or separation – With means to add treating material
Patent
1996-02-02
1998-12-08
Cintins, Ivars
Liquid purification or separation
With means to add treating material
422277, C02F 166
Patent
active
058464107
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for neutralizing a flow of fluid, and more exactly to an automatic supply of lime, crushed limestone and/or crushed dolomite and/or other neutralizing materials being placed in a device cassette built into, for example, a surface water well and which may be exchanged at intervals when required.
BACKGROUND OF THE INVENTION
During the last decades it has been obvious that the acidity of rain-water constitutes an environmental problem, which has to be taken care of. Therefore there has been activities to preserve lakes from becoming more acid by treating those with some basic agent like for instance lime, which as powder has been spread out over the surface of the lake by means of a small aircraft or a helicopter. It is however expensive to maintain the proper acidity value (pH) of all the waters of the nature and therefore it is desirable to find further alternatives to this kind of treatments discussed above.
In several countries there are no direct water wells available and the rain-water is collected into large tanks for later use. This water is normally filtered or treated in some way to get rid of contaminations. A German document DE-A1-4 209 429 discloses an installation for pre-treatment, storage and transport of rainwater for use as working water in household, companies and in public buildings and a treatment of the water for this purpose by infiltration or laying on a recipient.
A similar construction but of a more simple form is disclosed in another German document DE-A1-3 812 136. The purpose of the latter device is to make use of rain-water from a drain-pipe for a later usage. Also in this case some treatment like filtering is necessary.
Natural water from drilled or dug wells often do contain residuals of lime as well as natural salts and is therefore not neutral but often somewhat basic and may deviate slightly from a desired value of pH=7.0, whereby the water will then be considered as being "hard". Today there are many devices found on the common market for treating such "hard" water to make it "softer" by particularly removing some of the lime content. On the other hand rain-water is normally "soft" in this respect and when using pure rain-water such a treatment would as a rule not be necessary.
On the other hand there is a desire to treat acid surface water in a way to prevent it from influencing negatively on the environment and making the rivers and lakes more acid. This is the basic problem which has to be taken into account and which problem the present solution as far as possible want to solve according to the present invention.
BRIEF DESCRIPTION OF THE INVENTION
The main object of the present invention is to create an automatic contribution of neutralizing material to a flow of fluid, for instance, to a rain-water flow, whereby this contributed material will accompany the flow upon discharge, and in a case of surface water to rivers and lakes of the environment and thereby contribute to preserving better acidity values of those waters.
According to a first object of the present invention a cassette device is provided, whereby the cassette device comprises an outer, preferably conical and circular, wall as well as an inner, preferably circular, wall forming a space between said outer and inner walls which space, for instance, is filled with lime, crushed lime-stone and/or crushed dolomite and/or other neutralizing materials and the cassette device is further provided with refill openings to form an exchangeable re-usable cassette, the cassette additionally exhibiting inlets in said inner circular wall, and outlets are created by through holes at a bottom rim of the cassette between the outer and inner walls, whereby the device is centrally fully open to handle large flows of fluid.
According to a second object of the present invention a cassette device is provided, wherein each refill opening is provided with a cap or the like for closing the top of the space between the outer and inner walls.
According to a third object
REFERENCES:
patent: 1517926 (1924-12-01), Weckesser
patent: 3519134 (1970-07-01), Hassinger
patent: 3581903 (1971-06-01), Holz
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