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Ecological composite coagulant for treating printing and dyeing wastewater, and preparation method and application of coagulant

A technology for printing and dyeing wastewater and coagulant, which is used in water/sewage treatment, chemical instruments and methods, textile industry wastewater treatment, etc. Improve processing efficiency, not easy to break, and the effect of solid particle size

Active Publication Date: 2018-06-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an ecological composite coagulant for treating printing and dyeing wastewater and its preparation method and application. Printing and dyeing wastewater has poor water quality adaptability, poor treatment effect and secondary pollution during use

Method used

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  • Ecological composite coagulant for treating printing and dyeing wastewater, and preparation method and application of coagulant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) The sodium silicate nonahydrate solution that configuration volume is 500mL, concentration is 0.2mol / L, joins in the sulfuric acid solution that 5mL volume fraction is 25% and adjusts the pH value of solution to be 2.5, polymerizes 30min at room temperature, obtains solution, record for solution A.

[0025] (2) Weigh 0.1mol of ferrous sulfate heptahydrate and add it to 50mL of dilute sulfuric acid solution with a volume fraction of 5%, stir until dissolved at a rate of 300r / min, drop into the above solution A, and stir at a rate of 300r / min After 10 min, a mixed solution was obtained, which was designated as solution B.

[0026] (3) Weigh 0.02 mol of potassium permanganate solid and add it to solution B in step (2), stir at 300 r / min until completely dissolved, and age for 12 hours to obtain an ecological composite coagulant.

[0027] (4) Put the ecological composite coagulant in step (3) into the simulated printing and dyeing wastewater, the dosage is 0.2mmol / L, a...

Embodiment 2

[0029] (1) Configure a sodium silicate nonahydrate solution with a volume of 450 mL and a concentration of 0.15 mol / L, add it to 4.5 mL of a sulfuric acid solution with a volume fraction of 25%, adjust the pH value of the solution to 3, and polymerize for 30 minutes at room temperature to obtain a solution, Denoted as solution A.

[0030] (2) Weigh 0.06mol ferrous sulfate heptahydrate and add it to 45mL of dilute sulfuric acid solution with a volume fraction of 5%, stir until dissolved at a rate of 250r / min, drop into the above solution A, and stir at a rate of 250r / min After 20 min, a mixed solution was obtained, which was designated as solution B.

[0031] (3) Weigh 0.015 mol of potassium permanganate solid and add it to solution B in step (2), stir at a rate of 250 r / min until completely dissolved, and age for 24 hours to obtain an ecological composite coagulant.

[0032] (4) Put the ecological composite coagulant in step (3) into the simulated printing and dyeing wastewat...

Embodiment 3

[0034] (1) Configure a sodium silicate nonahydrate solution with a volume of 350 mL and a concentration of 0.1 mol / L, add it to 3.5 mL of a sulfuric acid solution with a volume fraction of 25%, adjust the pH value of the solution to 3.5, and polymerize for 30 minutes at room temperature to obtain a solution, Denoted as solution A.

[0035] (2) Weigh 0.03mol ferrous sulfate heptahydrate and add it to 40mL of dilute sulfuric acid solution with a volume fraction of 5%, stir until dissolved at a rate of 200r / min, drop into the above solution A, and stir at a rate of 200r / min After 30 min, a mixed solution was obtained, which was designated as solution B.

[0036] (3) Weigh 0.01mol potassium permanganate solid and add it to solution B in step (2), stir at a rate of 200r / min until completely dissolved, and age for 36h to obtain an ecological composite coagulant.

[0037] (4) Put the ecological composite coagulant in step (3) into the simulated printing and dyeing wastewater, the do...

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Abstract

The invention relates to an ecological composite coagulant for treating printing and dyeing wastewater, and a preparation method and application of the coagulant. The raw materials of the composite coagulant are sodium silicate nonahydrate, ferrous sulfate heptahydrate and potassium permanganate. The preparation method comprises the following steps: (1) adding a sodium silicate nonahydrate solution into a sulfuric acid solution, and performing a reaction to obtain a solution A; (2) dissolving the ferrous sulfate heptahydrate into a sulfuric acid solution, performing stirring, adding the stirred material into the solution A, and performing stirring to obtain a solution B; and (3) adding the potassium permanganate into the solution B, performing stirring, and performing aging so as to obtainthe coagulant; and the coagulant is applied to treatment of the printing and dyeing wastewater. The composite coagulant provided by the invention integrates the functions of coagulation, adsorption and oxidation, can omit a subsequent biochemical treatment process, greatly improves the treatment efficiency of the printing and dyeing wastewater, and is suitable for treatment of the printing and dyeing wastewater with large change in water quality, and the generated flocculating constituent has a large particle size, good sedimentation performance, and good acid and heat resistance, and is strong, not easy to break, and suitable for the wastewater with larger water temperature change.

Description

technical field [0001] The invention belongs to the field of coagulant and its preparation method and application, in particular to an ecological composite coagulant for treating printing and dyeing wastewater, its preparation method and application. Background technique [0002] Various wastewaters are produced in the textile printing and dyeing industry, with complex components, high organic matter content, deep color and large discharge volume. The content of toxic components in dye wastewater is increasing and it is not easy to degrade, and its threat and harm to the water environment are also increasing. The effective treatment of dye wastewater has become an urgent problem to be solved. [0003] The removal methods of dyes in wastewater mainly include advanced oxidation, enhanced coagulation and membrane separation. In practical engineering applications, chemical coagulation is still a widely used treatment technology. Generally, membrane separation technology and oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/28C02F1/72C02F103/30
CPCC02F1/281C02F1/5236C02F1/72C02F2103/30
Inventor 魏群山唐立朋柳建设肖峰吕强张弛徐龙凤刘亚男
Owner DONGHUA UNIV
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