Liquid purification or separation – Processes – Chemical treatment
Patent
1993-02-25
1994-12-27
McCarthy, Neil
Liquid purification or separation
Processes
Chemical treatment
210188, 210194, 210206, 210218, 2102212, 210765, 210908, 422222, 422231, 422234, C02F 172
Patent
active
053762843
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a method and apparatus for treating an effluent (or waste water) containing an organic chlorine compound such as, for example, an effluent containing trichloroethylene, tetrachloroethylene, etc.
2. Background Art
The effluent containing organic chlorine compounds such as trichloroethylene and tetrachloroethylene is subject to various government regulations enacted for the conservation of the environment. Thus, the desirability of establishing a highly advanced technique for the treatment of such an effluent as mentioned above has been finding growing recognition.
As conventional means for treating such effluents containing organic chlorine compound, the method of aeration using an aerating tank, the method of diffusion using a packed column, the method of adsorption using activated carbon, and the method of suitably combining the above mentioned methods have been known in the art.
Further, the method of treating an effluent containing an oxidizable substance by the action of a Fenton's reagent has been known in the art as disclosed in Japanese Unexamined Patent Publication No. 50-136947 and No. 63-158188 for example.
The aeration method, diffusion method, adsorption method, etc., mentioned above, however, are invariably methods of physical treatment and require giving to the substance such as, for example, the activated carbon which is entraining the organic chlorine compound seized from the treated effluent, a secondary treatment capable of rendering the treated effluent harmless. Thus, these methods have many difficulties from the standpoint of management of the treatment such as, for example, watching for the time at which the adsorbing ability of the activated carbon is entirely lost and consequently allowing the exhausted activated carbon to be replaced with a new supply.
When the Fenton reaction is utilized when a divalent ion compound such as FeSO.sub.4 is used, the reaction of Fe.sup.++ ion with H.sub.2 O.sub.2 occurs very suddenly. Since the effluent generally contains an organic chlorine compound in an extremely low concentration on the order of some tens of ppm to some hundreds of ppm, this divalent ion compound is substantially released in the form of oxygen gas rather than being consumed in the oxidation of the organic chlorine compound.
For the organic chlorine compound to be removed by oxidation from the effluent, therefore, H.sub.2 O.sub.2 and FeSO.sub.4 must be added in large amounts to the effluent. As a result, though the added reagents satisfactorily deprive the effluent of the organic chlorine compound, they persist in the remaining effluent and entail the disadvantage that the treatment of this effluent for removal of COD and Fe ion and the treatment thereof for pH adjustment require much time and labor.
In the Fenton reaction using such a trivalent Fe ion such as Fe.sub.2 (SO.sub.4).sub.3, although the trivalent Fe ion does not cause under such a sudden reaction as experienced by the divalent Fe ion, it is hardly soluble in water and, therefore, must be dissolved in an acid prior to use. Thus, the treated effluent necessitates the same time-consuming elaborate treatments for removal of COD and Fe ion and for pH adjustment as in the case of the divalent Fe ion.
DISCLOSURE OF THE INVENTION
Thus, the present invention, intended to eliminate the problems of the conventional techniques mentioned above and initiated by the interest taken in the method of treating an effluent containing an organic chlorine compound with a porous iron type metallic article and hydrogen peroxide, provides a method and apparatus for effecting oxidizing decomposition and removal of the organic chlorine compound more efficiently.
In accordance with the first aspect of the present invention, there is provided a method for treating an effluent containing an organic chlorine compound in the presence of a porous iron type metallic article and hydrogen peroxide thereby effecting oxidizing decomposition of the organic chlorine compound, which method c
REFERENCES:
patent: 4784775 (1988-11-01), Hardison
patent: 5116515 (1992-05-01), Selesnick
Data Base WPIL, Section Ch, Week 9220, Derwent Publications Ltd., London, GB, Class D15, AN92-162574.
Supplementary European Search Report, EP 92 91 3995.
Yogyo Yousui (Industrial Water), published Apr., 1991, vol. 391, pp. 29-35 and 28.
PPM, published Feb., 1977, pp. 30-38.
Matsuo Futoshi
Mori Atsushi
Senco Kengo
Takamori Osamu
Takemura Yozo
McCarthy Neil
Nippon Steel Corporation
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