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Treatment method for radical curing of black liquor of straw pulp from alkaline process

A technology of straw pulp black liquor and treatment method, which is applied in the directions of anaerobic digestion treatment, chemical instruments and methods, processing wastewater treatment, etc., can solve the problems of high operating cost, high operating cost, equipment corrosion, etc., and achieves a complete solution to pollution. , The effect of mature process route and less one-time investment

Inactive Publication Date: 2009-06-03
王照华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For example, Sun Lianchao of the Eco-Environmental Research Center of the Chinese Academy of Sciences and others invented the double-recovery and three-recovery straw pulp black liquor treatment method, which can be said to have taken a lot of effort and energy, but because of its high operating costs and serious equipment corrosion, the operation is more troublesome , The purity of the recovered product is not high, and it was not promoted in the end.
[0005] For another example, for large-scale straw pulp production lines, the China First Light Industry Association and others advocate the use of alkali recovery technology for the treatment of black liquor, such as Sun Paper, Chenming Paper, Bohui Paper, and Huatai Paper in Shandong, Yinge Paper and Xinya Paper in Henan all use alkali recovery technology to process straw pulp black liquor. However, due to the low calorific value of straw pulp black liquor and the interference of silicon cannot be completely removed, these companies have disposed of the black liquor, but The alkali recovery rate is not high, but the operating cost is high. The most troublesome thing is that a large amount of lime mud is piled up like a mountain due to the inability to recover lime, causing serious secondary pollution, which has become a common concern for these enterprises to continue to develop
For now, there is no better solution to the pollution of straw pulp black liquor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Example 1: A reed soda pulping enterprise with a production scale of 100,000 tons per year has a black liquor volume of 2400 cubic meters per day, and its fresh black liquor has a solid content of 16.8%, is dark black, and has a pH value of 13.6. Try the method of the present invention, after the fresh black liquor enters the bioreactor for 11 hours, the outlet material is khaki, with a pH value of 7.8 and obvious odor, and after 2 hours of aeration, the pH value rises to 8.9 without odor After being evaporated and concentrated by a six-effect evaporator, the concentration reaches 67.5%. After the material is sent to the spray granulation system, the product with a particle size of 1.0-1.2mm can be successfully produced under the condition of hot air temperature controlled at 295°C. All products are sold to Thermal power plants are used as grinding aids, combustion aids, and desulfurizers.

example 2

[0031] Example 2: A pulping and papermaking enterprise uses asparagus as raw material for pulping and uses alkaline pulping. The actual annual output is 55,000-60,000 tons, and the amount of black liquor produced per day is 1,800-2,000 cubic meters. Fresh black liquor The specific situation is: the PH value is 12-13, it is dark black, and the solid content is 15%. The enterprise adopts the process design of the present invention, and the total investment of each system is 22 million yuan. During the trial operation of the equipment, the fresh black liquor enters the bioreactor, and the residence time is 15 hours. There is obvious odor, the material is sent into the aeration system, the net residence time is 1.5 hours, the pH value rises to 8.5, basically no odor, the concentration after evaporation and concentration of the six-effect evaporator is controlled at 65%, the material is sent into The spray granulator, under the condition of drying temperature of 290-295 ℃, forms pr...

example 3

[0032] Example 3: A pulp and paper mill with rice straw as the main pulping raw material adopts an alkaline cooking process, with an annual pulping scale of 50,000 tons and a daily black liquor production of 1,500 cubic meters. The black liquor has a pH value of 13- 13.5, 15.5% solids, dark black. During the trial process of the method of the present invention, fresh black liquor enters the anaerobic bioreactor, and under the action of the active flora, when the net residence time reaches 12 hours, the material is discharged, and the outlet material turns grayish red with obvious odor. When the aeration time reaches 2 hours, the PH value rises to 8.5, and there is no smell, and there is no foam after continuing to aerate; the material is sent to The six-effect evaporator evaporates, in order to facilitate the smooth spraying of the subsequent process, after repeated tests, the concentration of the outlet material should be controlled at 58-60%; the material coming out of the e...

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Abstract

This invention provides a method for treating black liquor from alkali-process straw pulp, and the application of the byproduct. The method comprises: sending fresh black liquor from alkali-process straw pulp (pH is 12-13) into an anaerobic bioreactor containing Bacillus licheniformis, Staphylococcus aureus, and Halomonas sp., performing anaerobic biochemical treatment for 10-15 h to obtain active black liquor (pH is 7.5-8.0), aerating, evaporating, concentrating, and spray-granulating to obtain additive for fertilizer and feed, or industrial byproduct of petrochemical industry and power generation industry. Alternatively, the active black liquor can be directly deodored, sterilized by heating, and sprayed onto crops for improving the quality and increasing the yield, or added into feed for breeding chicks and pigs for stimulating the growth and accelerating the breeding speed. Compared with the present technique, the method can eliminate the environmental pollution of black liquor discharged from papermaking industry, and brings profit to medium and small papermaking plants that use straw as the raw material.

Description

1. Technical field [0001] The invention relates to a papermaking sewage treatment technology, in particular to a treatment method for radically eradicating straw pulp black liquor by alkali process. 2. Background technology [0002] At present, wood is used as the raw material for pulping and papermaking at home and abroad. The black liquor in the pulping process has the advantages of high calorific value and no silicon interference. of alkali, heat and lime. Due to the limited wood available for pulping and papermaking, most paper mills use non-woody fibers such as wheat straw, straw, reed, and bamboo as raw materials for pulping and papermaking, especially in Shandong and Henan provinces. Alkaline wheat straw pulping supports Chinese pulping Most of the paper industry has not only saved a large amount of foreign exchange for purchasing pulp and limited forest resources for the country, but also solved the problems of wheat straw storage and farmers' income generation in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F3/28C02F3/30C02F1/04C02F103/28
Inventor 王照华郑桂英张清海杨春玉
Owner 王照华
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