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Biological treatment method for paper making black liquor

A technology for biological treatment and papermaking black liquor, which is applied in the methods of using microorganisms, biochemical equipment and methods, biological water/sewage treatment, etc., can solve problems such as papermaking black liquor pollution, and achieves no secondary pollution and low treatment costs. Effect

Inactive Publication Date: 2005-04-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is suitable for various types of paper mills, especially for small and medium-sized paper mills, and can effectively solve the huge pollution problem of papermaking black liquor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Paper-making black liquor with a CODcr load of 100,000 mg / l, pH of 14 or more, is diluted 10 times to produce diluted black liquor wastewater with a CODcr load of 10,400 mg / l, and a pH of 12, which enters the acid precipitation reaction tank of white rot bacteria, and the residence time After 68 hours, the effluent CODcr load was 3845mg / l, and the pH value was 2.7. The effluent enters the white rot fungus degradation tank, the residence time is 24 hours, the effluent CODcr load is 1920mg / l, pH5.6, enters the anaerobic-aerobic system, the anaerobic residence time is 4 hours, the aerobic residence time is 24 hours, the effluent CODcr load is 380mg / l l, pH value is 6.5, BOD is 595mg / l, SS is 80mg / l.

Embodiment 2

[0029] Paper-making black liquor with a CODcr load of 80,000 mg / l, pH 12, is diluted 7 times to produce diluted black liquor wastewater with a CODcr load of 12,300 mg / l, pH 10, which enters the acid precipitation reaction tank of white rot bacteria, and the residence time is 72 hours. 4100 mg / l, pH 2.5. The effluent enters the white rot fungus degradation tank, the residence time is 24 hours, the effluent CODcr load is 2000mg / l, pH5.8, enters the anaerobic-aerobic system, the anaerobic residence time is 4 hours, the aerobic residence time is 24 hours, the effluent CODcr load is 400mg / l l, pH6.5, BOD5 98mg / l, SS 75mg / l.

Embodiment 3

[0031] Paper-making black liquor with a CODcr load of 35,000 mg / l and a pH of 11 is diluted 3 times to produce diluted black liquor wastewater with a CODcr load of 11,400 mg / l and a pH of 10, which enters the white rot bacteria acid precipitation reaction tank for a residence time of 60 hours, and the effluent CODcr load 3856mg / l, pH2.4. The effluent enters the white rot fungus degradation tank, the residence time is 24 hours, the effluent CODcr load is 1800mg / l, pH6.0, enters the anaerobic-aerobic system, the anaerobic residence time is 4 hours, the aerobic residence time is 24 hours, the effluent CODcr load is 350mg / l l, pH6.8, BOD586mg / l, SS75mg / l.

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PUM

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Abstract

The invention relates to a biology process method for paper making black liquid. The invention aims at the alkali of paper making black liquid and hard degradability of the lignin, using acid-producing white rot bacterium to produce organic acid to taking acid out of lignin in the paper making black liquid, deceasing alkaline and taking off lignin to make effluent water whose PH value is between 2 to 3. Acidity effluent water would decrease the content of acid soluble lignin and COD to produce effluent water that COD is below 2000 and PH value is from 5 to six. The effluent water comes to anaerobic and aerobiosis system to realize the standard. And the draft can be used for developing microorganism and organic fertilizer. The invention discloses suited to many kinds of paper making factory, especially for middle and small factory to effectively solve the pollution problem.

Description

【Technical field】 [0001] The invention is a biological technology applied to the treatment method of papermaking black liquor, which belongs to the environmental protection technology of efficient treatment of papermaking black liquor. 【Background technique】 [0002] my country is the third largest papermaking country (total output) in the world. Due to the shortage of raw materials, high resource and energy consumption, small production scale of enterprises, and backward overall technology and equipment, waste liquid pollution in the papermaking industry (chemical pulping) has been a serious issue for decades. a serious environmental problem. [0003] The cooking black liquor in the papermaking waste liquid contains lignin, hemicellulose, cellulose, pectin, tannin, resin, etc., which are mostly refractory organic polymer pollutants, and about 35% of the cooking black liquor solids are Inorganic matter, 65% is organic matter (mainly cellulose, hemicellulose, lignin and pecti...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34C12N1/00C12N1/36
Inventor 张晓昱王宏勋
Owner HUAZHONG UNIV OF SCI & TECH
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