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A kind of preparation method of coagulant used for dyeing wastewater pretreatment

A dyeing wastewater and pretreatment technology, which is applied in textile industry wastewater treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of accelerating dyeing wastewater coagulation, ineffective removal, and small dosage, and achieves The pretreatment cost is economical, the applicability is strong, and the effect of small dosage

Active Publication Date: 2021-06-04
长兴科创科技咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that existing coagulants for treating dyeing wastewater cannot effectively remove dyes with small relative molecular weights in water-soluble dyes and dyes that are not easy to form colloids, the purpose of the present invention is to provide a coagulation agent for pretreatment of dyeing wastewater. The preparation method of the agent, the coagulant prepared by the method of the present invention can accelerate the coagulation of the dyeing wastewater, effectively remove the dyes with relatively small molecular weight and difficult to form colloids, and can further play a flocculation effect, so that the organic waste in the dyeing wastewater Coagulation and flocculation sedimentation, and the dosage is small, less sediment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method for a coagulant for pretreatment of dyed wastewater, comprising the following steps:

[0025] (1) Mix graphene oxide with 98% concentrated sulfuric acid and potassium persulfate at a mass ratio of 1:80:2 and heat to 80°C for 6 hours to fully react, filter and rinse with distilled water to obtain primary graphene oxide; then ultrasonically disperse into water, Add 62 times the mass of sodium hydroxide and 55 times the mass of chloroacetic acid for ultrasonic reaction for 8 hours, evaporate to dryness and rinse with distilled water to obtain a solid; then vacuum dry at 50°C for 12 hours to obtain carboxylated graphene oxide;

[0026] (2) Ultrasonic disperse carboxylated graphene oxide into water to obtain a dispersion, add dropwise sodium hydroxide solution to pH 12, heat and stir for 8 hours, then add sulfuric acid solution until the pH of the dispersion is 5.8 to obtain a mixture liquid;

[0027] (3) Add FeCl with a concentration of 3 mol / L to the ...

Embodiment 2

[0032] A kind of preparation method of the flocculant that is used for dyeing wastewater pretreatment, the difference with embodiment 1 is that metal salt used is FeCl 3 with AlCl 3mixture with a molar ratio of 0.5:1.

[0033] Disperse the above coagulant in water and heat to make a colloidal solution, stir and add it to the treatment tank containing dyeing wastewater to pretreat the dyeing wastewater, add a colloidal solution with a concentration of 150 mL / L dyeing wastewater, and remove the turbidity after standing for 3 hours The rate is 70%.

Embodiment 3

[0035] A preparation method for a coagulant for pretreatment of dyed wastewater, comprising the following steps:

[0036] (1) Mix graphene oxide with 98% concentrated sulfuric acid and potassium persulfate at a mass ratio of 1:90:2.5 and heat to 83°C to fully react for 7 hours, filter and rinse with distilled water to obtain primary graphene oxide; then ultrasonically disperse into water, Add 67 times the mass of sodium hydroxide and 58 times the mass of chloroacetic acid for ultrasonic reaction for 10 hours, evaporate to dryness and rinse with distilled water to obtain a solid; then vacuum dry at 55°C for 18 hours to obtain carboxylated graphene oxide;

[0037] (2) Ultrasonic disperse carboxylated graphene oxide into water to obtain a dispersion, add dropwise sodium hydroxide solution to a pH of 12.5, heat and stir for 9 hours, and then add sulfuric acid solution until the pH of the dispersion is 6.3 to obtain a mixture liquid;

[0038] (3) Add Fe(NO 3 ) 3 solution, Fe(NO ...

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a method for preparing a coagulant used for the pretreatment of dyed wastewater, wherein graphene oxide is prepared into carboxylated graphene oxide with high carboxyl content through step-by-step oxidation oxidation, and then oxidized by hydrogen Sodium is converted into graphene oxide modified by sodium surface, and then metal ions such as iron, calcium, aluminum, magnesium, copper and zinc are loaded on the surface of carboxyl graphene oxide by replacement to make metal salt modified graphene oxide , and then mixed with soluble natural polysaccharides to make a coagulant with strong applicability to the pretreatment of dyeing wastewater. The coagulant of the present invention has three-in-one coagulation and flocculation effects, has strong applicability to the coagulation pretreatment of dyeing wastewater, can effectively remove dyes with relatively small molecular weights and are not easy to form colloids, and further flocculates dyes in dyeing wastewater. The organic waste coagulates and settles by flocculation, the amount of input is small, the sediment is less, and the cost of pretreatment is more economical.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for preparing a coagulant used for pretreatment of dyed wastewater. Background technique [0002] Textile printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, high alkalinity, and large changes in water quality. It is one of the most difficult industrial wastewater to treat. Wastewater, printing wastewater, finishing process wastewater, alkali reduction wastewater, etc. Among them, dyeing wastewater is the wastewater generated during the dyeing process of textiles. Dyeing wastewater is alkaline, generally with a pH value above 13, mainly containing organic dyes and surfactants, and varies with fiber type, dye type and concentration, and additives. There are different degrees of pollution depending on the scale. Dyeing wastewater is usually treated by the following methods: neutralization method, coagulation me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/28C02F103/30
CPCC02F1/5272C02F1/54C02F2103/30
Inventor 赵志云
Owner 长兴科创科技咨询有限公司
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