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Treating method of papermaking black liquor

A treatment method and papermaking black liquor technology, applied in chemical instruments and methods, processing process wastewater treatment, light water/sewage treatment, etc., can solve the problems of consuming dissolved oxygen, affecting water quality, blackening of water, etc., to achieve the reduction of enzymes Usage amount, improvement of treatment effect, effect of increased enzyme activity

Inactive Publication Date: 2019-12-06
诸城市鑫通环保机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Black liquor contains a large amount of suspended solids, organic pollutants and toxic substances, and direct discharge into water bodies will cause serious pollution
Its main hazards are: papermaking wastewater containing a large amount of fibers, pigments and inorganic salts will turn the water black and have a special stench; the biochemical oxygen demand (BOD) of papermaking black liquor containing high concentrations of organic pollutants can be as high as 5000-40000g / L, will consume a lot of dissolved oxygen in the water and affect the water quality; a large amount of alkaline substances in the black liquor will cause the pH value of the water to rise sharply and destroy the balance of the water environment
[0004] At present, the alkali recovery system to solve the pollution problem has the problems of large investment, high treatment cost, incomplete treatment, and serious secondary pollution. Although biological enzymes are used to treat papermaking black liquor in the prior art, the treatment effect is not significant. The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment illustrates a kind of processing method of papermaking black liquor, specifically comprises the following steps:

[0026] One or more of peroxidase, laccase or xylanase, and a photocatalyst are added to the papermaking black liquor.

[0027] Preferably: the percentage of the enzyme (referring to the sum of all enzymes) and the total mass of the photocatalyst is 1-3%.

[0028] Due to the huge investment, high cost, and high energy consumption of the alkali recovery device in the method for processing black liquor in the prior art, and a large amount of sewage will be discharged in the follow-up section. Most paper-making enterprises discharge the cooking black liquor without treatment or incomplete treatment, resulting in serious environmental pollution and becoming a major problem restricting the development of the paper-making industry. Traditional papermaking black liquor treatment technologies mainly include chemical methods, physical chemical...

Embodiment 2

[0031] The technical features of this embodiment that are the same as those of the above embodiments are not described in detail. The technical features of this embodiment that are different from the above embodiments are as follows: the mass ratio of the peroxidase:photocatalyst is 100:1-3.

[0032] Further: the reaction conditions are: pH=8-10, the reaction temperature is 30-45°C, and the reaction time is 2-4h.

Embodiment 3

[0034] The technical characterictic that present embodiment is identical with above-mentioned embodiment will not go into details, the technical characterictic that present embodiment is different from above-mentioned embodiment is as follows: described peroxidase: xylanase: the mass ratio of photocatalyst is 70:30:1- 3.

[0035] Further: the reaction conditions are: pH=8-10, the reaction temperature is 30-50°C, and the reaction time is 2-5h.

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Abstract

The invention discloses a treating method of papermaking black liquor. One or more selected from peroxidase, laccase or xylanase and a photocatalyst are simultaneously added into papermaking black liquor, wherein the percentage of total mass of the enzyme and photocatalyst is 1-3%. The method for treating papermaking black liquor according to the embodiment of the invention has simple steps, the enzymes and the photocatalyst are directly added to the black liquor of the papermaking, and then degradation treatment of the black liquor can be completed. The treated water can be discharged directly, and the method has low cost and is suitable for popularization and use on a large scale.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating papermaking black liquor. Background technique [0002] Paper industry wastewater accounts for about 10% of the total industrial wastewater in the country, and the pollution to my country's water resources and environment is becoming more and more serious. The papermaking black liquor produced in the pulping process is an important source of pollution in the papermaking industry. At present, there is no better treatment process for alkaline pulping and papermaking black liquor. [0003] The wastewater produced by the alkaline (caustic soda and sulfate) pulping process of the paper industry contains a large amount of lignin and is dark brown, so it is called black liquor. Black liquor contains a large amount of suspended solids, organic pollutants and toxic substances, and direct discharge into water bodies will cause serious pollution. Its main hazards...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F103/28
CPCC02F1/30C02F3/34C02F2103/28
Inventor 宋捷郝志弘刘园园
Owner 诸城市鑫通环保机械有限公司