JPS6064691A - Water treating method - Google Patents

Abstract

PURPOSE:To enhance reaction efficiency by prolonging the life of a catalyst, by filtering water to be treated by a heat resistant filter material, and subsequently bringing a catalyst into contact with water to be treated to removed a specific substance in water to be treated through reaction. CONSTITUTION:For example, water 4 to be treated containing hydrazine is introduced into a treating tank 1 having an aeration apparatus 2 arranged to the bottom part thereof through an introducing course part 3 but a heat resistance filter material 5 is interposed in the introducing course 3 to removed mud or sand in water 4 to be treated. Small catalyst particles 6 such as catalyst carriers, each of which is formed by supporting particles of a metal such as Co or Fe by plastic, are dispersed in water 4 to be treated while air is blown into water 4 to be treated from the aeration apparatus 2 to perform oxidative decomposition of hydrazine in water 4 to be treated. After treatment, water 4 to be treated is transferred to a separation tank 8 through a communication course 7 to separate the small catalyst particles.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water treatment method using a catalytic reaction in which water to be treated containing COD, such as hydrazine, is brought into contact with a catalyst and the COD is removed by oxidative decomposition.

Contaminants such as oil droplets and dust are dispersed in this type of treated water, but these solids are adsorbed onto the catalyst surface and coat the catalyst, shortening its life.

The present invention aims to solve the above-mentioned conventional drawbacks and extend the life of the catalyst, and its main feature is to filter treated water through a heat-resistant sulfur material prior to treatment.

To explain the present invention using the diagram shown in FIG.
), water to be treated (4) containing, for example, hydrazine is introduced, but a heat-resistant a & material (5) is interposed in the introduction path (3) to remove mud, sand, etc. from the water to be treated (4). Remove the solid content. The heat-resistant filter medium (5) is made of metal such as stainless steel, titanium steel, Hastelloy, Inconel, Constantun, etc.
Made of heat-resistant materials such as ceramics such as alumina, steatite, cordierite, titanium oxide, and zirconia.
It can be made into any shape such as a three-dimensional network, honeycomb, or sintered body. In the case of hydrazine oxidation removal method, Fe l Co IN 1 + Rh HP d
+ P t Kasa's ■1 group or Cu + Ag H
Particles or flakes of group Ib metals such as Au, or ferrite particles or flakes of these metals, or these metals or ferrites are used in polyethylene.

Catalyst particles (6) such as catalyst carriers made of plastics such as propylene, polyvinyl chloride, polyamide, ceramics such as silica and alumina, etc. are supported on each other in the water to be treated, and an aeration device is used. From (2), air, other oxygen-containing gas, ozone, peracetic acid Mizuki, etc. are blown in to oxidize and decompose the hydrazine in the treated water. The treated water (4) thus treated is transferred to the separation tank (8) via the communication path (7), and the catalytic bodies (6) are separated.

The present invention is not limited to the above Example VC; for example, the melting medium reaction may be carried out in a fixed bed.

As described above, the present invention performs the catalytic reaction after removing impurities such as oil droplets and b by filtering the water to be treated using a heat-resistant member, so that the MW life is prolonged and the reaction efficiency is increased. improves. To give an example, in the apparatus shown in Figure 1, water containing 200 ppm of hydrazine was used as the treated water, alumina foam was used as the Q material, and Pd was used as the catalyst. It becomes like this. Second
In the figure, the bottom axis is hydrazine once (ppm), 4'
ii 'Lli K is the case where the reaction time is taken and filtering is performed using a filter material, and there is no X-X filter material. According to Figure 2, it can be seen that when filtration is performed prior to the reaction, the hydrazine concentration decreases rapidly in a short reaction time. Furthermore, in the present invention, since a heat-resistant material is used for the filter, the foreign substances accumulated in the filter medium can be decomposed and removed by incineration, and the filter medium can be easily regenerated.

[Brief explanation of the drawing]

FIG. 1 is a systematic diagram of Example 1 of the present invention, and FIG. 2 is a graph showing the relationship between hydrazine concentration and reaction lJS. In the figure (1)...processing tank, (3)...introduction route, (
4)...Water to be treated, (5)...Heat resistance,) 9 materials, (
6) Catalytic body patent applicant Daido Steel Co., Ltd., H, l, Ni 1

Claims (1)

[Claims] A water treatment method in which a catalyst is brought into contact with treated water to react and remove specific substances in the water to be treated, and the water treatment method is characterized in that the water to be treated is filtered through a heat-resistant additive prior to treatment.