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

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...

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