Method for preparing flocculant for treating papermaking black liquor by using waste collagen

A technology for papermaking black liquor and flocculant, which is applied in the field of flocculant preparation and treatment of waste water, can solve problems such as environmental pollution, waste of resources, and reduce the processing load of biochemical engineering, and achieve the effects of low price, reducing pollution load and shortening treatment period.

Inactive Publication Date: 2011-02-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, except a small part of these skin collagens are used to produce recycled leather, most of the rest are treated as garbage, which will not only cause environmental pollution, but also a huge waste of resources
[0005] Even so, there is no report on the preparation of flocculation materials from waste collagen produced in tannery production, and there is no report on the use of such flocculation materials for sedimentation treatment of papermaking black liquor to effectively reduce the processing load of later biochemical engineering

Method used

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  • Method for preparing flocculant for treating papermaking black liquor by using waste collagen
  • Method for preparing flocculant for treating papermaking black liquor by using waste collagen
  • Method for preparing flocculant for treating papermaking black liquor by using waste collagen

Examples

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Effect test

Embodiment 1

[0028] Add 50 parts of waste pig skin scraps to 200 parts of water and soak at room temperature for 9 hours, transfer to a reaction kettle with a stirrer and a thermometer, then add 0.3 parts of 2709 protease, stir and react at a temperature of 45°C for 3.5 hours, and then adjust the pH to 4.0 and Stir and react at 70-75°C for 2-3 hours; cool down to 55°C, adjust the pH to 8.0, add 0.8 parts of 3-chloro-2-hydroxypropyltrimethylammonium chloride, stir for 7 hours, filter , rinse with water until there is no obvious residue on the surface of the skin collagen flocculant, dry at 50°C for 8 hours, and crush to 0.1-0.15mm.

[0029] The infrared spectrogram of the prepared pigskin collagen base papermaking black liquor flocculant is as follows figure 1 As shown, its scanning electron microscope image is shown in figure 2 , 3 shown.

Embodiment 2

[0031] Add 60 parts of waste cowhide into 250 parts of water and soak at room temperature for 12 hours, transfer to a reaction kettle with a stirrer and a thermometer, then add 0.6 parts of 2709 protease, stir and react at a temperature of 50°C for 4 hours, and then mix the mixture between pH 4.5 and 80 Stir and react at ~85°C for 2.5 hours; cool down to 60°C, adjust the pH to 8.5, add 1.1 parts of 3-chloro-2-hydroxypropyltrimethylammonium chloride, stir for 8 hours, filter, and rinse with water Until there is no obvious residue on the surface of the skin collagen flocculant, dry it at 50°C for 8 hours and crush it to 0.1-0.15mm.

Embodiment 3

[0033] Add 70 parts of waste sheepskin scraps to 250 parts of water and soak at room temperature for 8 hours, then transfer to a reaction kettle with a stirrer and a thermometer, then add 0.5 parts of 2709 protease, stir and react at a temperature of 47°C for 3 hours, and then adjust the temperature between pH 4.0 and 75 Stir and react at ~80°C for 2.5 hours; cool down to 55°C, adjust the pH to 8.3, add 1.2 parts of 3-chloro-2-hydroxypropyltrimethylammonium chloride, stir and react for 6 hours, filter, and rinse with water Until there is no obvious residue on the surface of the skin collagen flocculant, dry it at 55°C for 7 hours and crush it to 0.1-0.15mm.

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Abstract

The invention discloses a method for preparing a flocculant for treating papermaking black liquor by using waste collagen. The method comprises the following steps of: soaking waste scurf in water at room temperature; adding protease and performing enzymolysis at the temperature of between 45 and 50 DEG C; performing stirring reaction under the condition of the pH of between 4.0 and 4.5 and the temperature of between 70 and 90 DEG C; cooling to the temperature of between 50 and 60 DEG C, adding a cationization agent for stirring reaction when the pH is between 8.0 and 8.5, and filtering, washing, drying, and crushing to prepare the flocculant. The flocculant prepared by the method of the invention achieves a larger adsorption ratio surface area, and can be more widely combined with hydroxyls, sulfo groups and the like of hemicellulose and lignin in the papermaking black liquor so as to promote soluble pollutants in the black liquor to be separated, adsorbed and precipitated, and thus, the overall treatment efficiency of the black liquor is improved and a treatment period of the black liquor is shortened greatly. In the invention, the price of raw materials is low, the preparation process is simple, the operability is high, the promotion is easy, the production cost is low, and thus, the method has a good market prospect.

Description

technical field [0001] The invention belongs to the technical field of preparing and treating waste water flocculants, and in particular relates to a method for preparing and treating papermaking black liquor flocculants with waste collagen. Background technique [0002] Alkaline pulping is widely used in my country's paper industry, that is, raw materials are cooked in sodium hydroxide lye at 150 °C, and black liquor refers to the raffinate separated from pulp after cooking. Every time 1 ton of pulp is produced by this method, about 10 tons of this black liquor will be produced. Black liquor is a highly polluting organic waste liquor, which not only contains polyhydroxy organic substances such as hemicellulose and alkali lignin, but also its chemical oxygen demand COD is often as high as hundreds of thousands of mg / liter. If the pulping black liquor is directly discharged without treatment, it will undoubtedly cause serious pollution to the environment. Because of this, pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/06
Inventor 何强迟原龙吕思宁曹明蓉廖学品
Owner SICHUAN UNIV
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