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Method for comprehensively treating and utilizing dissolving pulp black liquor

A technology for comprehensive treatment and dissolving pulp, applied in chemical instruments and methods, processing wastewater treatment, adsorption water/sewage treatment, etc., to achieve the effect of saving treatment costs, good economic benefits, and reducing pH

Active Publication Date: 2013-03-27
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that there is no technology and enlightenment that can handle black liquor well in the prior art

Method used

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  • Method for comprehensively treating and utilizing dissolving pulp black liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Comprehensive treatment and utilization of dissolving pulp black liquor (applicable to effluent recovery)

[0051] The pH of the black liquor to be treated: 12.99, COD: 14736mg / L, chromaticity: 2500, volume: 1m 3 ;

[0052] Into the black liquor, the total amount of sulfur dioxide, carbon dioxide and nitrogen oxides is 2000mg / m 3 Left and right flue gas, time 20min, black liquor pH drops to 9.0, COD drops to 12089mg / L, chroma drops to 2300;

[0053] Prepare a polyaluminum ferric sulfate solution with a mass fraction of 10%, add 20kg of the solution to the wastewater, and stir for 3 minutes;

[0054] Prepare anionic polyacrylamide TSG-820 with a mass fraction of 1‰, add 20kg of the solution to the wastewater, and stir for 5 minutes. After the above two steps of flocculation, the COD of the black liquor will be reduced to 9690mg / L, and the chromaticity will be reduced to 2000;

[0055] Plate and frame filter press, collect flocculation sediment, and produce organic fer...

Embodiment 2

[0062] Comprehensive treatment and utilization of dissolving pulp black liquor (applicable to effluent recovery)

[0063] The pH of the black liquor to be treated: 12.99, COD: 14736mg / L, chromaticity: 2500, volume: 1m 3 ;

[0064] The total amount of sulfur dioxide, carbon dioxide and nitrogen oxides shall be 2000mg / m 3 The left and right flue gas is passed into the wastewater through the pipeline, and the aeration time is 20 minutes, the pH drops to 9.0, the COD drops to 12089mg / L, and the chromaticity drops to 2300;

[0065] Add 20 kg of prepared polyaluminum chloride solution with a mass fraction of 15% to the waste water, and stir for 3 min;

[0066] Add 20 kg of prepared non-ionic polyacrylamide TS-45 solution with a mass fraction of 2‰ to the wastewater, stir for 5 minutes, and after two-step flocculation treatment, the COD of the black liquor will be reduced to 9527 mg / L, and the chromaticity will be reduced to 1900;

[0067] Belt filter press is used for solid-liqui...

Embodiment 3

[0074] Comprehensive treatment and utilization of dissolving pulp black liquor (terminal effluent up to standard discharge)

[0075] The pH of the black liquor to be treated: 12.99, COD: 14736mg / L, chromaticity: 2500, volume: 1m 3 ;

[0076] Into the black liquor, the total amount of sulfur dioxide, carbon dioxide and nitrogen oxides is 2000mg / m 3 Left and right flue gas, the ventilation time is 20min, the pH drops to 9.0, the COD drops to 12089mg / L, and the chromaticity drops to 2300;

[0077] Prepare a polyaluminum ferric sulfate solution with a mass fraction of 5%, add 20kg of the solution to the waste water, and stir for 3 minutes;

[0078] Prepare anionic polyacrylamide TSG-825 with a mass fraction of 0.5‰, add 20kg of the solution to the wastewater, and stir for 5 minutes. After the above two steps of flocculation treatment, the COD of the black liquor will drop to 9862mg / L, and the chroma will drop to 2050;

[0079] Disc-type centrifugation collects flocculation and ...

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Abstract

The invention belongs to the technical field of biochemical environmental protection and provides a method for comprehensively treating and utilizing dissolving pulp black liquor. The method comprises the steps of (1) acidification, (2) flocculation, (3) oxidation, (4) adsorption and (5) biochemical treatment and further achieves sewage discharge up to the standard. By means of the method for comprehensively treating and utilizing the dissolving pulp black liquor, flue tail gas, slag and other wastes can be completely utilized, treatment cost is saved remarkably while emission of the three wastes is reduced, flocculated precipitate can serve as a raw material for producing organic fertilizers, considerable economic benefit is produced, chemical oxygen demand (COD) of water subjected to adsorption treatment is reduced by more than 85%, chroma is reduced by more than 99%, and the water can be recycled and can be subjected to biochemical treatment and then discharge up to the standard. The method is reasonable in process, low in cost and easy to implement, and has good economic benefit, environmental benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of biochemistry and environmental protection, and provides a method for comprehensive treatment and utilization of dissolving pulp black liquor. Background technique [0002] The papermaking and pulping industry occupies an important position in my country's national production. According to statistics, there were more than 10,000 papermaking and pulping enterprises nationwide in 2012. Papermaking and pulping industry has always been a major user of water in industrial production, and papermaking and pulping wastewater accounts for about one tenth of all industrial wastewater. my country's traditional dissolving pulp manufacturing industry uses cotton linters as raw materials for production, but in recent years, with the improvement of cotton linter production technology, the output of cotton linters has begun to decrease. Therefore, bamboo pulp and hardwood pulp, which are substitutes for dissolving pulp pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F1/52C02F1/56C02F1/72C02F1/28C02F3/30C02F103/28
Inventor 秦森杨传伦门振张心青王建平周炳
Owner CHAMBROAD CHEM IND RES INST CO LTD
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