Liquid purification or separation – Plural distinct separators – Filters
Patent
1980-11-29
1982-11-16
Cintins, Ivars C.
Liquid purification or separation
Plural distinct separators
Filters
B01D 2302
Patent
active
043593860
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for separating oil from an oil-water mixture, which can be collected in a collecting vessel apart from the circulation system after separation by means of a water jet pump operated by a closed circulation system.
Due to a greater sense of responsibility toward our environment, possibilities of cleaning water polluted for instance with oil, are sought more than ever so that for example in case of damage caused by water in a heating installation, the sewage system is not placed under unnecessary stress, or if a river or a sea is polluted with oil, the biology of the waters is not interfered with.
Devices are known by means of which the greater part of the water mixed with oil can be sucked, e.g. from basements. For this purpose, the oil-water mixture is sucked up, preferably by means of a centrifugal pump, and fed into a tank. Since the oil-water mixture in these devices comes into contact with the rotating parts of the pump, an emulsion is created whereby later separation of the oil from the water is almost impossible. Consequently even if there is only slight oil pollution, great quantities of water must first be transported away from the place of pollution and then be destroyed. With oil pollution on water, a considerable amount of water must be pumped off that cannot be returned to the river or the sea, since the oil cannot be removed from the oil-water mixture, even if there is only a small degree of pollution, which, however, exceeds the admissible maximum.
It is true that devices do exist in which the oil-water mixture does not get into contact with the rotating parts of a pump. Thus, for example, the German Gebrauchmuster U.S. Pat. No. 1,781,835 refers to a water jet pump by means of which an oil-water mixture can easily be sucked off. However, since the sucked up mixture is added to the water circulation system to operate the water jet pump during the sucking operation, this likewise does not offer an open circulation system with the water, e.g., of lakes or rivers, by means by which the water jet pump could be operated.
With a device disclosed in the German patent application No. 27 58 038.7, an oil-water mixture was collected for the first time in a collecting vessel by means of a water jet pump, without the water circulation system for the operation of the water jet pump coming into contact with the polluted water.
Therefore, it is the object of the present invention to separate the oil from an oil-water mixture and to be able to return the cleaned water e.g., to a sewage system or a lake or a river, without risk of pollution of the environment. Thereby the advantage shall be gained that in case of oil pollution, only a small amount of water as compared to the escaped oil must also be destroyed.
One suggestion to solve this problem is realized by a method wherein the oil-water mixture is fed over at least one inclined plane provided with an oil-repellent fleece, in order to recover the separated oil above the plane and the water below the plane. Thus, only the separated oil must be collected in a tank for deposit or destruction. The recovered water can be fed without any difficulty into a sewage system or into open water without running the risk of too great a load on the environment. Preferably, however, the oil-water mixture is not passed over only one inclined plane, but rather over several planes arranged at acute angles to each other and one atop the other. In such a case the different planes can be arranged in a housing and their ends can overlap. This offers the advantage that the oil-water mixture on the separated oil flowing off of a plane will always reach the plane arranged below. The oil and the water separated from the individual planes are respectively fed to separate outlets.
However, the problem can also be solved by pumping the oil off through a water-repellent and oil-permeable fleece arranged in the upper marginal region of the collecting vessel by means of a known barrel pump, e.g. in form of a plunger pump.
This proposal offers the advantages
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