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A method for coagulation pretreatment of dyeing wastewater

A dyeing wastewater and pretreatment technology, which is applied in filtration treatment, sedimentation treatment, water/sewage treatment, etc., can solve the problems of ineffective removal and accelerated dyeing wastewater coagulation, etc., and achieve pretreatment cost economy, strong applicability, and high input volume small effect

Active Publication Date: 2021-04-20
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 methods for coagulation treatment of 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 method for coagulation pretreatment of dyeing wastewater The method can speed up the coagulation of dyeing wastewater, effectively remove dyes with relatively small molecular weight and are not easy to form colloids, and achieve a good coagulation pretreatment effect of dyeing wastewater. The treated dyeing wastewater can be further treated by other methods or coagulation methods deal with

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for coagulation pretreatment of dyed wastewater, characterized in that it comprises the following steps:

[0029] (1) Send the dyeing wastewater to the pretreatment pool after filtering the lint and sundries through the grid, and adjust the temperature to 15°C;

[0030] (2) ultrasonically disperse the coagulant containing metal salt-modified graphene oxide into water and heat to a uniform colloidal solution;

[0031] (3) Add the colloidal solution into the pretreatment tank at a concentration of 100mL / L, stir at 500r / min for 3 hours, and then let it settle for 12 hours;

[0032] (4) Add 100g / L biochar to the pretreatment tank for adsorption and sedimentation, then filter the dyed wastewater and send it to the next treatment process.

[0033]Wherein the coagulant comprising metal salt modified graphene oxide is made by the following process:

[0034] a. Mix graphene oxide with 98% concentrated sulfuric acid and potassium persulfate at a mass ratio of 1:80:2 an...

Embodiment 2

[0041] A method for coagulation pretreatment of dyed wastewater, the difference from Example 1 is that when preparing a coagulant comprising metal salt-modified graphene oxide, the metal salt used is FeCl 3 with AlCl 3 mixture with a molar ratio of 0.5:1.

[0042] The turbidity removal rate of the dyeing wastewater treated by the above method was 84%.

Embodiment 3

[0044] A method for coagulation pretreatment of dyed wastewater, characterized in that it comprises the following steps:

[0045] (1) Send the dyeing wastewater to the pretreatment pool after filtering the lint and sundries through the grid, and adjust the temperature to 20°C;

[0046] (2) ultrasonically disperse the coagulant containing metal salt-modified graphene oxide into water and heat to a uniform colloidal solution;

[0047] (3) Add the colloidal solution into the pretreatment tank at a concentration of 15mL / L, stir at 550r / min for 4 hours, and then let it settle for 16 hours;

[0048] (4) Add 150g / L attapulgite to the pretreatment tank for adsorption and sedimentation, then filter the dyeing wastewater and send it to the next treatment process.

[0049] Wherein the coagulant comprising metal salt modified graphene oxide is made by the following process:

[0050] a. Mix graphene oxide with 98% concentrated sulfuric acid and potassium persulfate at a mass ratio of 1:9...

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Abstract

The invention relates to the field of sewage treatment, in particular to a method for coagulation pretreatment of dyeing wastewater. The dyeing wastewater is filtered, and then a coagulant comprising metal salt-modified graphene oxide is added for sedimentation, and then an adsorbent is added for adsorption and sedimentation, wherein the coagulant is composed of After graphene oxide modification, metal ions such as iron, calcium, aluminum, magnesium, copper, and zinc are introduced into the surface to make metal salt-modified graphene oxide, which is then mixed with soluble natural polysaccharides, which has strong applicability to dyeing wastewater. In this way, the coagulation of the coagulant and the adsorption of the adsorbent are combined to effectively remove the turbid substances in the dyeing wastewater. The coagulant has a three-in-one coagulation and flocculation effect, and has strong applicability to the coagulation pretreatment of the dyeing wastewater. It is not easy to form colloidal dyes, and through further flocculation, the organic wastes in the dyeing wastewater are coagulated, flocculated and settled, the dosage is small, the sediment is less, and the pretreatment cost is more economical.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for coagulation pretreatment of dyeing 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 method, air flotati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/30
CPCC02F1/001C02F1/281C02F1/5236C02F1/66C02F9/00C02F2001/007C02F2101/308C02F2103/30
Inventor 赵志云
Owner 长兴科创科技咨询有限公司
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