DE2109322A1 - Procedure and equipment for cleaning liquids that are contaminated with organic substances - Google Patents

Description

DIPL.-CHEM. DR. ALFRED SCHÖN

PATENT LAWYERS

2600/70 - S / S 63-1 Stenberg-Flygt Aktiebolag, Pack 171 20 Solna 1, Sweden

Method and device for cleaning liquids contaminated with organic substances

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The invention relates to a method for cleaning liquids, which are polluted with organic substances by collecting and catalytically oxidizing the polluting Substances to achieve a decomposed state s.

It is known, for example, to purify wastewater by oxidation processes, with the implementation of this Methods in the liquids contained organic materials are decomposed, with their heat content if necessary is recovered. For this purpose, liquids that have previously been contaminated with solid particles can be used inorganic .Materials have been released. In the

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Purification of wastewater becomes a so-called four-stage purification process carried out, with the implementation of the wastewater then to a mechanical, biological and / or chemical cleaning is finally cleaned by removing residual organic compounds. To the Strong oxidizing agents are used to achieve the desired degree of oxidation. The extent to which that Diluting oxidant is, of course, considerable. Because the reaction rate is proportional to the concentration of the reactants present, the reaction proceeds slow. To speed up the reaction process suitable oxidation-accelerating catalysts are used up / ended, however, the increase in the rate of reaction achieved in this way is very moderate. Therefore, the process has the disadvantage that it is time consuming and space required, so that it must be considered uneconomical.

The aim of the invention is to create a preferably continuous one Purification process of the type mentioned above, using the known oxidation process inherent disadvantages are eliminated. According to the invention, a rapid oxidative cleaning process is obtained, which can be carried out continuously in a small reaction space. A suitable system for implementation of the method also falls within the scope of the invention.

The invention is explained in more detail below using an example, reference being made to the accompanying drawing will.

The method according to the invention is carried out in principle in the following way: The liquid to be cleaned, For example, wastewater that has previously been freed from solid substances and dissolved inorganic contaminants

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is, is contacted with a so-called catcher, that is, with a substance that has a high affinity for adsorption to both the organic material to be removed and the oxidatively decomposed material and the oxidizing agent used, and which has a chemical catalytic effect on the oxidative decomposition of the material exercises. The decomposition stage of the "process is temporally and spatially separated from the Adsorρtionsstufe, ie the former is shifted compared to the latter, with the collector being removed from contact with the liquid and with it the adsorbed organic material and in contact with a strong and highly concentrated Oxidizing agent is brought, whereby the organic material is oxidized in a reaction process which is accelerated by the catalyst A. Consequently, the organic impurities, when they contact the collector, are greatly diluted, whereby its adsorbing effect is improved and the impurities are collected. It is relatively easy to carry out the process continuously and with a very high degree of efficiency. On the other hand, the subsequent chemical reaction, ie the oxidation, takes place between two highly concentrated reactants, with the luffanger playing its catalytic effect. .-end at the termination of the Oxydationsverfahrens Auff ^is: AIGER brought in renewed contact with the dirty liquid that has been introduced into the system. The whole process takes place continuously and is preferably monitored and controlled automatically.

The device or the system for carrying out the inventive The procedure is explained in the accompanying drawing. This device consists of an adsorption device 10, which is the central part of the device

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forms. The adsorption device consists of a cylindrical Boiler 12, which is surrounded by a jacket 14. An inlet pipe 16 is arranged centrally around the boiler 12, with between the tube 16 and the wall of the vessel 12, which is surrounded by the jacket 14, a bed 18 of a collector material is located. Granulated activated carbon has proven to be a suitable collection material proven. Both the inlet pipe 16 and the compartment between the boiler 12 and the surrounding jacket 14 are perforated in such a way that the liquid to be cleaned can be introduced through the central tube 16 and radially outwards through the bed. 18 to the coat 14 flows, from where it is removed through an outlet 20. The bottom part of the boiler 12 opens into an outlet 11b, which is In the outer chamber of a water-driven jet pump 22 opens, the continuously collecting material from the lower Part of the boiler 12 withdraws so that the bed 18 descends at a speed set in a corresponding manner. the Continuity of the process is maintained in the way that fresh or reprocessed collection material is continuously available at the top of the system.

The collector material removed from the adsorber 10 is fed with water to a separating device 24 in which the V / a is removed from the collector material and withdrawn through the outlet 25a, while the catcher material is removed through a Outlet 25b is fed to a reactor 26 in the form of an inclined cylindrical chamber 28 which has a screw conveyor 30 records. As can be seen from the drawing, the catcher material, which .wird fed to the chamber 28 at its left end, guided through the chamber by the screw conveyor 30 and emptied at the opposite end of the chamber into an outlet 10a of the cylindrical vessel 12, causing the downwardly migrating Catcher replenished from the top of the device will. During its passage through chamber 28

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the catcher material is in contact with a strong highly concentrated Bring oxidizing agent, for example chlorine gas, which is passed in countercurrent to the material and through an inlet 29a located at the top of the chamber 28 and through an outlet 29b at the opposite lying end of the chamber is removed.

In this way, a continuously operating system using simple facilities is obtained. This system can handle large amounts of liquid within a relatively small space. The oxidative decomposition of the impurities is extremely effective due to the high concentration of the reactants as well as due to the catalytic effect exerted by the hanger. It is possible to achieve a degree of purification of 99 ? <>. When carrying out a purification stage according to the invention, it is possible to give the wastewater treated in the wastewater purification device the purity of drinking water.

The system described can be modified in various ways. For example, the bed of catcher material can be horizontal lie or be inclined to the horizontal. The progressive forward movement of the. Material is thereby through fibrating or shaking conveyors accomplished. Furthermore, the reactor chamber in which the catcher material contacts the oxidant after a variety of different Possibilities to be constructed. The same applies to the rest of the funding institutions, with the help of which the required circulation in the system is maintained.

The cleaning method according to the invention can also be used for cleaning of gases, for example exhaust gases, can be used. These gases are appropriately treated in such a way that the contaminating components are solubilized, both

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for example by V / ash method, whereupon the solution according to the invention is treated.

Finally, instead of chlorine gas, Dian can use other Chlorvex * - Use bonds as oxidizing agents, for example Oxochlorate, for example hypochlorite. Sour peat or oxygen containing compounds can also be used for example chromate and permanganate.

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Claims (5)

- 7 claims 1. Continuous process of cleaning liquids by oxidation that contaminate with organic materials are, characterized in that the liquid contaminated in this way comes into contact with a catcher material is, which has a high adsorptive affinity for both the organic material and the oxidizing agent or possesses the oxidizing agents, the one or those for the oxidative Decomposition of the impurities is or are used, and which catalytically promotes this decomposition, the collection material is removed and contacted with the oxidizing agent, which is in a highly concentrated form for decomposition of the organic material that has accumulated on and carried along by the hanger material becomes, and the catcher the process of recontacting with contaminated liquid, which is continuous is fed to the process, is fed. 2. The method according to claim 1, characterized in that Activated carbon, preferably in granulated form, is used as a catcher material. 3. The method according to any one of claims 1 or 2, characterized in that that the oxidizing agent used consists of chlorine or chlorine-containing compounds. 4. The method according to any one of claims 1 or 3, characterized gekennzeiclinet, that the oxidizing agent used consists of oxygen or oxygen-generating compounds, such as Bichromate or permanganate compounds. 5. Device for performing the method according to any one of claims 1-4 for cleaning liquids with 109837S1512 an organic material are polluted by adsorptives Collect the contaminants on a collection material and through. Decomposition of the substances by catalytic oxidation of these substances with an oxidizing agent, characterized by an adsorber (10) which contains a bed (18) of a collector material, which moved continuously in its longitudinal direction and continuously withdrawn at one end and at the other end is renewed to an appropriate extent, an inlet (16) for the liquid to be cleaned, wherein the inlet is arranged to feed liquid to the bed longitudinally in such a manner that that the liquid travels through the bed at substantially right angles to the bed movement, one Collection chamber (14, 20) which is arranged in such a way that the liquid then passes through the Receives hanger bed (18), and a conveyor (22) for conveying the discharged catcher material from the Bed (18) and for feeding the material to a reaction chamber (26) through which this material is passed becomes, during which the catcher material is brought into contact with a strong oxidizing agent to oxidize the organic contaminants produced by the Material are entrained, and wherein the reactor (26) and the adsorber (10) are so arranged with respect to one another are that the collecting material that the reactor leaves, can be used to fill up the adsorber. 109837/1512