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Dye adsorbent and its application in treating dye effluent

A dye wastewater and adsorbent technology, which is applied in the direction of adsorption water/sewage treatment, energy wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of small degree of aggregation, large dosage, and failure to meet direct discharge standards, etc. Achieve the effect of strong adsorption capacity and good dispersion capacity

Inactive Publication Date: 2002-05-15
张明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As can be seen from this document, the dye wastewater treated with the above-mentioned flocculants has high chroma, high decolorization rate, low chroma, and low decolorization rate, but no matter it is high chroma or low chroma wastewater, the treated filtrate The chromaticity is still more than 120 times, and it cannot meet the direct discharge standard stipulated by the state. This is because the dicyandiamide formaldehyde polymer in the above-mentioned flocculant is a primary polymer, and the degree of polymerization is small, and the adsorption force of dyes in wastewater is weak. , thus affecting its treatment effect, when the wastewater temperature is high, the treatment effect is worse due to the good solubility of the dye
In addition, using the above-mentioned dicyandiamide formaldehyde flocculant to treat the dyes in the wastewater requires a large amount of input and high cost, and the use of ammonium chloride will also cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0016] Pour 100 grams of dicyandiamide, 100 grams of formaldehyde solution with a concentration of 36% and 100 grams of alum into the reaction kettle together, stir, when the temperature of the reactant rises to 95-100 ° C, keep it warm for 1.2 hours, stop heating, and take out the product , dried at 40-50°C, ground into powder, and sieved with a 300-mesh sieve to obtain product A.

preparation Embodiment 2

[0018] Pour 100 grams of dicyandiamide, 100 grams of formaldehyde solution with a concentration of 36% and 350 grams of alum into the reaction kettle together, stir, when the temperature of the reactant rises to 95-100 ° C, keep it warm for 1.5 hours, stop heating, and take out the product , dried at 40-50°C, ground into powder, and sieved with a 250-mesh sieve to obtain product B.

preparation Embodiment 3

[0020] Pour 100 grams of dicyandiamide, 100 grams of formaldehyde solution with a concentration of 36% and 500 grams of alum into the reaction kettle together, stir, when the temperature of the reactant rises to 95-100 ° C, keep it warm for 1.5 hours, stop heating, and take out the product , dried at 40-50°C, ground into powder, and sieved with a 250-mesh sieve to obtain product C.

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Abstract

This invention dislcoses a dye adsorbent and its application as flocculant in the process of dye waste water treatment. This invented dye adsorbent is the compound of dicyandiamide, formaldehyde and alum according to a certain proportion, and after mixing, the product is produced by reaction under a certain temp., and its advantages include very good effect in decoloring the dye waste water up tothe standard of direct discharge, and cheap price and low dosage of dye adsorbent.

Description

technical field [0001] The invention relates to an adsorbent, in particular to a dye adsorbent, and also relates to the application of the adsorbent in dye wastewater treatment. Background technique [0002] In the treatment of high-chroma dye wastewater, the flocculant prepared by dicyandiamide, ammonium chloride and formaldehyde has its special effect in removing the color of dye wastewater. Because dicyandiamide formaldehyde polycondensate has a high cationic charge density, it provides a large number of cations to neutralize the negative charges on the dye molecules and lose stability, while the added flocculant generates a large amount of flocs due to hydrolysis. It absorbs and traps the destabilized dye molecules, and separates them from the water together, so as to achieve the purpose of decolorization. Chinese patent document CN1060142C (announced on January 3, 2001) discloses the preparation method of the above-mentioned flocculant and the application of the floccu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/01C02F1/28C02F1/54C02F1/56
CPCY02W10/37
Inventor 张明
Owner 张明
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