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Preparation method of chitosan coated bauxite printing and dying industry wastewater flocculating agent

A technology of printing and dyeing wastewater and chitosan, which is applied in textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of complex preparation process, poor decolorization effect, high cost, etc., and achieve simple preparation process and floc settlement Fast, no secondary pollution effect

Inactive Publication Date: 2012-05-23
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of complex preparation process, high cost, secondary pollution, and poor decolorization effect on dyes with good water solubility or small relative molecular weight in the existing printing and dyeing wastewater treatment flocculants, and propose a method using shell Preparation of ecological composite high-efficiency printing and dyeing wastewater flocculant and its preparation method by coating natural clay minerals with polysaccharides

Method used

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  • Preparation method of chitosan coated bauxite printing and dying industry wastewater flocculating agent
  • Preparation method of chitosan coated bauxite printing and dying industry wastewater flocculating agent
  • Preparation method of chitosan coated bauxite printing and dying industry wastewater flocculating agent

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment 1: Dissolve 10g chitosan in 200mL1% hydrochloric acid solution, fully stir, make 5% chitosan hydrochloric acid solution. Natural bauxite is ground and passed through a 200-mesh sieve, and roasted in a muffle furnace at 600°C for 1 hour. Weigh 100g of roasted bauxite and add it to the chitosan hydrochloric acid solution, stir well while adding it, place it in a constant temperature drying oven at 105°C to dry or microwave dry, grind it into powder, and prepare chitosan and bauxite An ecological compound high-efficiency flocculant for printing and dyeing wastewater with a soil mass ratio of 1:10. The compound flocculant was used under the condition of pH=5 to treat 100 mg / L simulated wastewater of dyes commonly used in printing and dyeing factories. The decolorization results are shown in Table 1.

[0014] Table 1 The decolorization effect of composite flocculants with a mass ratio of 1:10 on various dye wastewater

[0015]

Embodiment 2

[0016] Embodiment 2: 10g chitosan is dissolved in 200mL1% hydrochloric acid solution, fully stirred, makes 5% chitosan hydrochloric acid solution. Natural bauxite is ground and passed through a 200-mesh sieve, and roasted in a muffle furnace at 600°C for 1 hour. Weigh 150g of roasted bauxite and add it to the chitosan hydrochloric acid solution, stir well while adding it, place it in a constant temperature drying oven at 105°C for drying or microwave drying, grind it into powder, and prepare chitosan and bauxite An ecological compound high-efficiency flocculant for printing and dyeing wastewater with a soil mass ratio of 1:15. The composite flocculant is used to treat twelve kinds of dye simulated wastewater commonly used in printing and dyeing factories with a concentration of 100mg / L.

[0017] The results are shown in Table 2.

[0018] Table 2 The decolorization effect of composite flocculants with a mass ratio of 1:15 on various dye wastewater

[0019]

Embodiment 3

[0020] Example 3: Prepare a composite flocculant according to the method of Example 1. After the composite flocculant is used to treat reactive brilliant red X3B simulated wastewater with a concentration of 100mg / L, the flocs are roasted at 500°C for 40min to remove dyes and chitosan After removing sugar and other organic matter, the bauxite was re-coated with chitosan to prepare a composite flocculant with a mass ratio of 1:10, and then used to treat reactive brilliant red X3B simulated wastewater. The decolorization results of the dyes by repeated use are shown in Table 3 .

[0021] Table 3: Reuse effect of bauxite

[0022]

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Abstract

The invention relates to chitosan coated bauxite printing and dying industry wastewater flocculating agent and preparation method thereof, relating to the water treatment medicament technical field. Chitosan, natural bauxite and industrial hydrochloric acid are taken as raw materials, are mixed and stirred by ratio and sequence and then are subject to baking or microwave drying, thus obtaining the composite flocculating agent product. Deacetylated degree of chitosan is more than 70%, the fineness of the natural bauxite is 200 meshes, and the ratio of the chitosan and bauxite is 1:10-15(g / g). The main raw material of the invention is natural bauxite and can be reused, cost is low, preparation process is simple, and decolouring effects on active dye, reducing dye, dispersing dye, direct dyeand sulphide dye are all good. The invention has the characteristics of economy, high efficiency, no secondary pollution and environmental protection.

Description

technical field [0001] The invention relates to the technical field of water treatment agents, in particular to an ecological compound high-efficiency printing and dyeing wastewater flocculant prepared by coating natural clay minerals with chitosan and a preparation method thereof. Background technique [0002] Traditional inorganic flocculants have high decolorization efficiency for hydrophobic dyes and dyes with relatively large molecular weights, but poor decolorization effects for reactive dyes with good water solubility and small relative molecular weights, while organic polymer flocculants such as polyacrylamide Less dosage, fast flocculation speed, less sludge generated, but secondary pollution and high price; chitosan treatment of dye wastewater has no secondary pollution, but high pH requirements, poor floc linking performance, and loose particles , poor settling performance and high cost. Inorganic modification and inorganic-organic composite flocculants can overc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F103/30
Inventor 刘桂萍刘长风刘学贵
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY