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Method for pre-treating dyed wastewater by coagulation

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: 2018-08-17
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 dyeing 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 pre-treating dyed wastewater by coagulation. The method comprises the following steps: filtering the dyed wastewater and then adding a coagulant containing metal salt modified graphene oxide for settling; then adding an adsorbent for adsorption settlement. The coagulant is obtained by modifying graphene, then introducing metal ions such as iron, calcium, aluminum, magnesium, copper and zinc on the surface to prepare the metal salt modified graphene oxide, and then mixing the metal salt modified graphene oxidewith soluble natural polysaccharides. The applicability to the dyed wastewater is high. By combination of coagulation of the coagulant and adsorption of the adsorbent, turbid substances in the dyed wastewater are removed effectively, the coagulant has three-in-one coagulation and flocculation effects, applicability to coagulation pretreatment of the dyed wastewater is high, dyestuff which is small in relative molecular weight and cannot be in the shape of colloid easily can be removed effectively, by a further flocculation effect, organic wastes in the dyed wastewater are coagulated and are subjected to flocculating settling, the feeding amount is small, dregs are less, and the pretreatment cost is low.

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 Applications(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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