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Method of extracting biochemical fulvic acid from papermaking black liquid through biological fermentation

A technology for biochemical fulvic acid and papermaking black liquor is applied in the field of waste recycling, which can solve the problems of large equipment investment and high operating costs, and achieve the effects of low cost, reduced production cost and wide application prospects.

Inactive Publication Date: 2017-06-30
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the alkali recovery technology is the most important method adopted by domestic large-scale papermaking enterprises, but because of the disadvantages of large investment in equipment and high operating costs in this technology

Method used

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  • Method of extracting biochemical fulvic acid from papermaking black liquid through biological fermentation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Filter the papermaking black liquor to remove the residue. Acidity is adjusted to pH and be 9, add its volume ratio 1% bacterial enzyme mixed solution (Phanerochaete chrysosporium and Coriolus versicolor, trichosporon and lignin peroxidase) in papermaking black liquor, Add appropriate amount of urea to provide nitrogen source, and control the carbon-nitrogen ratio (C / N) 25:1. The water content is controlled at 65%, the temperature is controlled at 25 degrees, and proper ventilation is provided to supply the oxygen required by the microorganisms, and the fermentation lasts for 18 days. Take the fermentation mixture in the reaction kettle, add a NaOH solution with a concentration of 0.1mol / L (the volume ratio of the NaOH solution to the fermentation mixture is 1:10), feed nitrogen gas for 5-10min, and drive away O 2 , react at constant temperature for 4 hours, after the reaction is completed, let it stand in the dark for 10 hours, and centrifuge at 10000r / min for 10min t...

Embodiment 2

[0022] Filter the papermaking black liquor to remove the residue. Adjust the acidity to pH 8, add 2% by volume of bacteria and enzyme mixture (Phanerochaete chrysosporium and Trametes versicolor, Pseudomonas PKE117, laccase) to the papermaking black liquor, add an appropriate amount of urea Provide a nitrogen source and control the carbon-to-nitrogen ratio (C / N) to 30:1. The water content is controlled at 55%, the temperature is controlled at 35 degrees, and proper ventilation is provided to supply the oxygen required by the microorganisms, and the fermentation is carried out for 12 days. Take an appropriate amount of fermented papermaking black liquor in a reaction kettle, add 0.1mol / L NaOH solution (volume ratio 1:10), feed nitrogen gas for 5-10min, and drive away O 2 , constant temperature reaction for 4 hours. After the reaction was completed, it was left to stand in the dark for 10 hours, and the residue was removed by centrifugation at 10000r / min for 10min. Adjust the...

Embodiment 3

[0024]Filter the papermaking black liquor to remove the residue. Acidity adjusted to pH is 7, adds its volume ratio 3% bacterium enzyme mixed solution (Phanerochaete chrysosporium, Trichosporium yeast, Pseudomonas PKE117, manganese peroxidase) in papermaking black liquor, adds Appropriate amount of urea provides nitrogen source, and the carbon-nitrogen ratio (C / N) is controlled at 35:1. The water content is controlled at 60%, the temperature is controlled at 25 degrees, and proper ventilation is provided to supply the oxygen required by the microorganisms, and the fermentation lasts for 16 days. Take an appropriate amount of fermented papermaking black liquor in a reaction kettle, add 0.1mol / L NaOH solution (volume ratio 1:10), feed nitrogen gas for 5-10min, and drive away O 2 , close the lid tightly, and react at constant temperature for 4 hours. After the reaction was completed, it was left to stand in the dark for 10 hours, and the residue was removed by centrifugation at...

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Abstract

The invention relates to a method of extracting biochemical fulvic acid from papermaking black liquid through biological fermentation. The method includes the steps that papermaking black liquid is fermented through microorganism, lignin, hemicellulose and other macromolecular substances in the papermaking black liquid are biologically degraded, the macromolecular substances are decomposed into micromolecular active substances, the content of active groups is increased, and biological activity is improved. Compared with papermaking black liquid which is not subjected to biological fermentation, the extraction rate of biochemical fulvic acid is increased by 10-25%. The problem of treating wastewater of a paper mill is solved, capital for treating the wastewater is saved for a papermaking enterprise, production cost is reduced, and the environment is protected. The papermaking black liquid is used in a resource mode for producing high-quality biochemical fulvic acid which has a good stimulating effect on plants, and the method plays an important role in guiding agricultural production and has wide application prospects.

Description

technical field [0001] The invention relates to a method for extracting biochemical fulvic acid from papermaking black liquor by biological fermentation, and belongs to the field of waste resource utilization. Background technique [0002] Fulvic acid (abbreviated FA for fulvic acid), which is a component of humic acid (abbreviated HA for humic acid). Compared with general humic acid, fulvic acid has the following characteristics: its condensation degree and carbon content are low, its molecular weight is small, and it is easy to be absorbed by organisms; it contains more oxygen; its structure contains more hydroxyl and carboxyl groups and other active groups, which have greater physiological activity than ordinary humic acid; lighter color, better water solubility, soluble in water, acid, and alkali solutions; high flocculation limit, large buffer capacity, pH value closer to neutral, easy be absorbed and utilized by organisms. Therefore, in practical application, fulvic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P17/18C12R1/645C12R1/38
CPCC12P17/181
Inventor 杨越超王忠华
Owner SHANDONG AGRICULTURAL UNIVERSITY
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