KR890003127B1 - Process for decolorising of waste water - Google Patents

Abstract

Coke powder in the settling pond are used for decoloring waste water from cokes factory. Ratio of waste water (ton) to the cokes (ton) is made to be below 7.5. Coke powder may be reused for sintering because of no change in calories after using. The large total pore volume of the cake powder brings good decoloring effect.

Description

Decolorization method of colored effluent from coke manufacturing plant

1 is a graph showing the chromaticity and chromaticity removal rate of the discharged water according to the value of the colored discharged water / sedimentation coke.

2 is a coke manufacturing plant wastewater treatment process.

The present invention relates to a bleaching method, in particular a bleaching method of the coke manufacturing plant coloring discharged water.

In general, when coke is manufactured by coking coal (briquette) at high temperature (1200-1350 ° C.) in a coke manufacturing plant to produce coke, the water attached to the coal and the water generated by the condensation reaction are discharged into the wastewater. This is caused by the removal of pollutants such as phenol and cyan by activating sludge method and tapping method (see Fig. 2). .

Conventionally, only the adsorption method using activated carbon is known as the decolorization method of wastewater from coke manufacturing plant. As the decolorization method of general wastewater from dyeing plant, oxidation decolorization method using chlorine, hypochlorite, ozone, etc., reduction decolorization method using iron, zinc, hydrogen sulfide, etc. Although it is known for the coagulation and decolorization by aluminum sulfate, ferrous or ferric salts, and polymer coagulants, other methods other than adsorption are not effective for the decolorization of the coke plant wastewater.

On the other hand, activated carbon adsorption method uses activated carbon as nitride, ethane, etc. as a raw material to revitalize zinc chloride, phosphoric acid, sulfuric acid, etc., or charcoal (palm shell) etc. as carbon raw material at 500-600 ℃ and revive it with steam. There is a problem in that the manufacturing and regeneration costs are high, and because the total porevolume is small, the discoloration effect is limited.

In order to solve the above problems, the present invention is to provide a method of decolorization of the colored effluent of the coke manufacturing plant excellent in decolorization efficiency and economical.

Hereinafter, the present invention will be described in detail.

In the present invention, in the method for decolorization of the colored effluent in the coke production plant, the coke is characterized in that the precipitated powdered coke is decolorized so that the color discharged water (ton) / battery powder coke (ton) value is 7.5 or less. It is about the discoloration method of factory colored discharge water.

In the above, when the value of the colored discharge water (ton) / settling powder coke (ton) is 7.5 or more, the adsorption capacity of the sedimentation basin coke is lowered is preferably 7.5 or less.

The sedimentation basin coke of the present invention has a higher particle dissipation efficiency because of finer particle size and larger electric common volume than ordinary coke and activated carbon, and the calorific value does not change before and after effluent treatment, and thus can be reused as a fuel for iron ore sintering. have.

The present invention configured as described above provides a remarkable effect that can remove the chromaticity in the discharged water discharged from the coke manufacturing plant boundary and effectively.

Hereinafter, the present invention will be described in detail through examples.

Example 1

In order to compare the present invention with the conventional method, the powdered coke of 3 mm or less, activated carbon of 12-30 mesh, and 200 g of precipitated branch coke of the present invention of 3 mm or less are filled in an acrylic adsorption column having an inner diameter of 3 cm and a length of 58 cm, respectively. Coke manufacturing plant wastewater and 500ml of effluent were treated by adsorption method, respectively. PAA, Al ₂ (SO ₄ ) ₃ and NaOCl were injected into coke plant wastewater and effluent respectively at concentrations of 50-200mg / l. In the tester controlled by the rotation speed, it was treated for 1 hour by flocculation and oxidation.

After the treatment, the turbidity, chromaticity, and chromaticity removal rate of the raw wastewater and the effluent were measured and shown in Table 1.

TABLE 1

* +: Chromaticity is increased.

As shown in Table 1, the coagulation bleaching method using the polymer coagulant (PAA) and Al ₂ (SO ₄ ) ₃ has a low color removal rate, and the oxidative bleaching method using NaOCl is used to remove the excess ferric chloride. It can be seen that the chromaticity is increased by reacting with iron ions and oxygen in NaOCl.

Example 2

In order to measure the decolorization capacity by the sedimentation powder coke of the present invention, 200, 500, 1000, 1500 and 2500 ml of effluent were continuously adsorbed and decolorized in an acrylic adsorption column having an inner diameter of 3 cm and a length of 58 cm filled with 200 g of the sedimentation powder coke of the present invention. Processed.

The discharged water had a chromaticity of 183 and a yellowish brown color before treatment.

After the above treatment, the chromaticity, chromaticity removal rate (%), and color of the inventive examples and the comparative examples were measured, and the results are shown in Table 2 and in order to explain more clearly.

TABLE 2

As can be seen from the above, the present invention has the effect of preventing pollution, resource utilization and cost reduction because the color of the discharged coke manufacturing plant using the sedimentation basin coke is economical and excellent decolorization efficiency.

Claims (1)

In the decolorization method of the colored discharge water of the coke manufacturing plant, the precipitated branched coke is decolorized so that the value of the colored discharge water (ton) / precipitated powder coke (ton) is 7.5 or less. How to discolor.

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