Paper making black liquor recycling zero discharge process adopting rotary membrane treatment

A papermaking black liquor and rotary type technology, which is applied in the regeneration of lye, can solve the problems of complex operation, complex operation, many processes, and high technical requirements, achieve low operating cost, short water inlet process, and meet engineering requirements. Effect

Inactive Publication Date: 2012-10-10
山东博洋环境资源有限公司
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

For example, the method of papermaking black liquor purification and resource utilization mentioned in Chinese patent CN96115935.9 has high technical requirements, many procedures, and complicated operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Example 1: Treating papermaking black liquor wastewater COD=24000-30000mg / L with wheat straw as raw material

[0028] 20% calcium chloride solution is used, the acid solution is waste acid from the steel pipe factory, and the ultrafiltration membrane adopts polyvinylidene fluoride (PVDF) with a pore size of 0.02 μm. Specific operation: (1) Add 20% calcium chloride solution to the papermaking black liquor, adjust the pH value to 6, and the reaction time is 30 minutes, then add the waste acid from the steel pipe factory containing iron, adjust the pH value to 4, and the reaction time 30min, the removal rate of CODCr reached 90%, the removal rate of SS was about 85%, the removal rate of chroma was 95%, and the recovery rate of calcium lignin was about 80%. Solid-liquid separation, the obtained supernatant enters the Fenton strong oxidation system for further treatment, and the COD of the effluent after the Fenton strong oxidation treatment is reduced by less than 60 mg / L, ...

example 2

[0030] Example 2: Treating papermaking black liquor wastewater COD=15000-20000mg / L with rice straw as raw material

[0031] 20% calcium chloride solution is used, the acid solution is waste acid from the steel pipe factory, and the ultrafiltration membrane adopts polyvinylidene fluoride (PVDF) with a pore size of 0.02 μm. Specific operation: (1) Add 20% calcium chloride solution to the papermaking black liquor, adjust the pH value to 7, and the reaction time is 30 minutes, then add the waste acid from the steel pipe factory containing iron, adjust the pH value to 6, and the reaction time 30min, the removal rate of CODCr reached 90%, the removal rate of SS was about 85%, the removal rate of chroma was 95%, and the recovery rate of calcium lignin was about 80%. Solid-liquid separation, the obtained supernatant enters the Fenton strong oxidation system for further treatment, and the COD of the effluent after the Fenton strong oxidation treatment is reduced by less than 48 mg / L, r...

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Abstract

The invention relates to the technical field of straw pulp raw material production paper making waste water, and particularly discloses a paper making black liquor recycling zero discharge process adopting rotary membrane treatment, which includes the following steps: lignin calcium precipitating, thickening, Fenton strong oxidative system treatment, discharging according to standards and concentrate recycling. After the treatment through the paper making black liquor recycling zero discharge process, the paper making black liquor waste water COD is smaller than 60mg/L, the waste water colority removal rate is equal to and greater than 99%, and the water quality colority index is lower than 10 times. The paper making black liquor recycling zero discharge process has low treatment cost, high treating efficiency and low investment, is stable to operate, can be used in an industrialized way, and facilitates popularization and application.

Description

technical field [0001] The invention relates to the technical field of papermaking wastewater treatment from straw pulp raw material production, in particular to a resource treatment method for straw pulp papermaking black liquor wastewater. Background technique [0002] According to statistics, the discharge of industrial wastewater from papermaking and paper products above the county level in my country accounts for 18.6% of the total industrial discharge in the country, and the COD in the discharged wastewater accounts for about 44.0% of the total industrial COD discharge in the country. In recent years, through the unremitting efforts of many parties, although the paper industry has made some achievements in the prevention and control of water pollution, the wastewater from the paper industry, which accounts for about 50% of the total discharge, has not yet been treated up to the standard, and the task of wastewater pollution prevention and control is still quite heavy. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/04C08H7/00
Inventor 杨云军田雪辉刘长杰吕庆香杜洪仪胡文杰
Owner 山东博洋环境资源有限公司
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