Special composite mimic enzyme for advanced treatment of pulping and paper-making waste water, and preparation method and application thereof

A wastewater treatment, pulping and papermaking technology, which is applied in the direction of processing wastewater treatment, water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of difficult synthesis of ligands, low catalytic efficiency, poor specificity, etc.

Active Publication Date: 2014-07-23
SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of the above iron-based imitation enzyme systems have low catalytic efficiency and poor specificity (ferrous sulfate, ferric chloride); some have ligands that are expensive and difficult to synthesize (Fe-EDTA, Fe-salen, iron porphyrin phylloline, heme) and other issues
Therefore, the large-scale application of the above monomer imitative enzymes in the advanced treatment of pulping and papermaking wastewater still has certain limitations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve ferrous sulfate heptahydrate in distilled water, the mass concentration of ferrous sulfate heptahydrate is 20%, then control the temperature of the solution at 25°C, slowly add tetrasodium edetate to the solution under stirring conditions, and add The molar ratio of added tetrasodium edetate to ferrous sulfate heptahydrate is 1:15. After the addition is completed, stir and react for 30 minutes, and the mixed solution is a special compound imitation enzyme.

[0020] Application example: A pulp and paper company in Shandong that uses poplar as raw material, pulps chemically, and produces cultural paper from the secondary sedimentation tank, COD Cr It is 368mg / L, the color is 400 times, and the pH is 7.8. Adopt the special-purpose compound imitation enzyme depth treatment of this pulping and papermaking wastewater of embodiment 1, add 1.08mmol / L compound imitation enzyme (molar number is Fe in the waste water) 2+ Ion meter) and other conventional agents (other co...

Embodiment 2

[0022] Dissolve ferrous sulfate heptahydrate in distilled water, the mass concentration of ferrous sulfate heptahydrate is 15%, then control the temperature of the solution at 23°C, slowly add tetrasodium edetate to the solution under stirring conditions, and add The molar ratio of added tetrasodium edetate to ferrous sulfate heptahydrate is 1:20. After the addition is completed, stir and react for 30 minutes, and the mixed solution is a special compound imitation enzyme.

[0023] Application example: A pulp and paper company in Shandong that uses waste paper as raw material to produce newsprint, the water output from the secondary sedimentation tank, COD Cr It is 146mg / L, the color is 200 times, and the pH is 7.3. Adopt the special-purpose compound imitation enzyme advanced treatment of this pulping and papermaking wastewater of embodiment 2, add 1.18mmol / L compound imitation enzyme (molar number is Fe 2+ ion meter) and other agents (concentrated sulfuric acid 180mg / L, hydro...

Embodiment 3

[0025] Dissolve ferrous sulfate heptahydrate in distilled water, the mass concentration of ferrous sulfate heptahydrate is 20%, then control the temperature of the solution at 25°C, slowly add tetrasodium edetate to the solution under stirring conditions, and add The molar ratio of added tetrasodium edetate to ferrous sulfate heptahydrate is 1:20. After the addition is completed, stir and react for 30 minutes, and the mixed solution is a special compound imitation enzyme.

[0026] Application example: A pulping and papermaking enterprise in Shandong uses wheat straw as raw material, pulps semi-chemically, and produces container board paper. Cr It is 455mg / L, the color is 500 times, and the pH is 7.7. Adopt the special compound imitation enzyme depth treatment of this pulping and papermaking waste water of embodiment 3, add 1.30mmol / L compound imitation enzyme (molar number is Fe 2+ Ion meter) and other chemicals (concentrated sulfuric acid 120mg / L, hydrogen peroxide 200mg / L, ...

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Abstract

The invention relates to a special composite mimic enzyme for the advanced treatment of pulping and paper-making waste water, and a preparation method and application of the special composite mimic enzyme. The special composite mimic enzyme is prepared by the method comprising the following steps of: dissolving ferrous sulfate heptahydrate into distilled water to prepare 10-25% solution; controlling the temperature of the solution to be 20-35 DEG C; adding ethylene diamine tetraacetic acid tetrasodium into the solution according to the proportion under the stirring condition; and stirring for reaction for 25-40min to obtain the special composite mimic enzyme. The composite mimic enzyme is mild in reaction conditions and simple in technology, is used for the advanced treatment of the pulping and paper-making waste water, and is less in adding amount, high in catalysis efficiency, good in treatment effect and low in treatment cost.

Description

technical field [0001] The invention relates to a composite imitation enzyme specially used for advanced treatment of wastewater and its preparation method and application, in particular to a composite imitated enzyme specially used for advanced treatment of pulping and papermaking wastewater after secondary biochemical treatment. Background technique [0002] After secondary biochemical treatment of pulping and papermaking wastewater, the main residual pollutants are lignin and its biochemical derivatives. Effective removal of soluble lignin substances in pulping and papermaking wastewater is the key to the advanced treatment of pulping and papermaking wastewater . At present, the advanced treatment technologies of pulping and papermaking wastewater mainly include flocculation air flotation or sedimentation technology, advanced oxidation technology, adsorption filtration technology, membrane filtration technology, ecological treatment technology, etc. At present, the advan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C229/76C07C227/18B01J31/28C02F1/00C02F1/72C02F103/28
Inventor 刘勃洪卫边兴玉季华东苏颖庄会栋邹晓凤
Owner SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD
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