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Chromium-containing tannery wastewater treatment and resource utilization method based on natural biomass hydrogel

A technology of tannery wastewater and biomass, which is applied in animal processing wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., and can solve problems such as time-consuming and complicated operations

Active Publication Date: 2021-05-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional chemical desorption-reintegration-reuse method has the disadvantages of complicated operation and time-consuming

Method used

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  • Chromium-containing tannery wastewater treatment and resource utilization method based on natural biomass hydrogel
  • Chromium-containing tannery wastewater treatment and resource utilization method based on natural biomass hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1, preparation of CS-SA biomass hydrogel

[0036] Step 101, in parts by mass, dissolve 2 parts of sodium alginate (SA) in 100 parts of deionized water, and stir at 20°C for 40 minutes to obtain an SA solution; the viscosity of the sodium alginate is 180 Pa.s ;

[0037] Step 102, in parts by mass, dissolve 8 parts of chitosan (CS) in 200 parts of deionized water, and stir at 25°C for 60 minutes to obtain a CS solution; the viscosity of the chitosan is 400 mPa.s ;

[0038] Step 103: After uniformly mixing the SA solution obtained in step 101 and the CS solution obtained in step 102, add 2 parts of glutaraldehyde solution in parts by mass, and stir at 20°C for 10 minutes to obtain a slurry mixture Liquid; Described glutaraldehyde solution concentration is 25g / L;

[0039]Step 104. Put the slurry mixed liquid obtained in step 103 to stand under vacuum for 10 minutes, then pour it into a mold, expose the mold to a slow-release environment of glacial acetic acid, and r...

Embodiment 2

[0047] Step 1, preparation of CS-SA biomass hydrogel

[0048] Step 101, in parts by mass, dissolve 8 parts of sodium alginate (SA) in 200 parts of deionized water, and stir at 25°C for 60 minutes to obtain an SA solution; the viscosity of the sodium alginate is 220 mPa.s ;

[0049] Step 102, in parts by mass, dissolve 2 parts of chitosan (CS) in 100 parts of deionized water, and stir at 20°C for 40 minutes to obtain a CS solution; the viscosity of the chitosan is 200 Pa.s ;

[0050] Step 103: After uniformly mixing the SA solution obtained in step 101 and the CS solution obtained in step 102, add 4 parts of glutaraldehyde solution in parts by mass, and stir for 20 minutes at 25°C to obtain a slurry mixture Liquid; Described glutaraldehyde solution concentration is 25g / L;

[0051] Step 104. Put the slurry mixed solution obtained in step 103 to stand under vacuum for 20 minutes, then pour it into a mold, expose the mold to a slow-release environment of glacial acetic acid, an...

Embodiment 3

[0059] Step 1, preparation of CS-SA biomass hydrogel

[0060] Step 101, in parts by mass, dissolve 5 parts of sodium alginate (SA) in 150 parts of deionized water, and stir at 22°C for 50 minutes to obtain an SA solution; the viscosity of the sodium alginate is 200 mPa.s ;

[0061] Step 102, in parts by mass, dissolve 5 parts of chitosan (CS) in 150 parts of deionized water, and stir at 22°C for 50 minutes to obtain a CS solution; the viscosity of the chitosan is 300 mPa.s ;

[0062] Step 103. After uniformly mixing the SA solution obtained in step 101 and the CS solution obtained in step 102, add 3 parts of glutaraldehyde solution in parts by mass, and stir at 23°C for 15 minutes to obtain a slurry mixture Liquid; Described glutaraldehyde solution concentration is 25g / L;

[0063] Step 104. Put the slurry mixture obtained in step 103 under vacuum for 16 minutes, then pour it into a mold, expose the mold to a slow-release environment of glacial acetic acid, and react at 22°C...

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Abstract

The invention discloses a chromium-containing tannery wastewater treatment and resource utilization method based on natural biomass hydrogel, which comprises the following steps: by taking sodium alginate (SA) and chitosan (CS) as raw materials, carrying out glutaraldehyde crosslinking to form uniform and stable CS-SA biomass hydrogel in a slow-release acid environment, and then applying the CS-SA biomass hydrogel to the treatment of Cr (III)-containing tannery wastewater, so that the adsorption efficiency of Cr (III) can be greatly improved based on the characteristics of large specific surface area and multiple binding sites of a CS-SA spatial net structure; furthermore, using the degraded adsorbent-adsorbate for leather making retanning filling, so that on the basis that the damp and heat resistance stability of finished leather is improved, the grain surface of the finished leather is more compact, flatter and finer, and the leather body is softer and fuller. According to the Cr (III) treatment-retanning filling integrated strategy provided by the invention, a new way which is simple, convenient and feasible, greatly improves the leather forming performance and realizes maximum resource utilization of an adsorbent-adsorbate is opened up.

Description

technical field [0001] The invention belongs to the field of sustainable chemical industry, and in particular relates to a treatment and resource utilization method of chromium-containing tannery wastewater based on natural biomass hydrogel. Background technique [0002] In the leather tanning process, chrome tanning agents are favored because chrome tanning can impart many excellent properties to the finished leather. However, hide collagen has a limited ability to absorb traditional chrome tanning agents, and about 30%-40% of chromium (Cr(III)) is discharged into wastewater, causing serious pollution to the environment and an extreme waste of chromium resources. Among many Cr(III) treatment methods, adsorption method has been widely researched and applied due to its advantages of high treatment efficiency, easy operation, and reproducibility. Traditional adsorbents, such as natural minerals, agricultural waste, microbial biomass, etc., occupy an important position in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/22C02F103/24
CPCB01J20/24B01J20/28047C02F1/286C02F2103/24C02F2101/22
Inventor 官小玉饶平贺梦妍韩庆鑫陈咏梅安盟常金明
Owner SHAANXI UNIV OF SCI & TECH
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