Brief introduction of related technologies of biological pulping

At present, the industrialization of biological pulping at home and abroad is difficult, mainly because the environmental conditions of biological bacteria used in breeding are difficult to control, easy to be infected by miscellaneous bacteria, and unable to achieve the purpose of biodegradation. After years of research, Professor Zhang Jian and researchers from Beijing Leading Institute of Plant Fiber Products used FYR6 soft rot fungi for mutation and purification, which made the strain have a strong ability to degrade lignin. After tens of thousands of experiments combined with mechanical methods, the problem of biological pulping industrialization was finally broken. At the same time, it also solves the problem of bleaching pulp by biological bacteria.

1. Pulp production technology combining biodegradation (FYR6 soft rot fungus) with mechanical processing;

This strain was used by FYR6 soft rot fungi to degrade lignin. This soft rot fungus is the seventh generation strain cultivated by the patent inventor Professor Zhang Jian. Strong ability to decompose lignin, only lignin does not decompose fiber. It can propagate rapidly within 48 hours, so that the proportion of FYR6 soft rot bacteria in the degradation pool reaches 90%, and the miscellaneous bacteria only account for 10%. The raw material lignin is degraded by 80% within 72 hours, and then the raw material is dredged by a dredger to make it clean.

2. Bio-bleaching and pulp bleaching technology with zero bleach discharge:

The biological bleaching of lignin peroxidase and zero bleaching pulp bleaching technology have achieved good results, and the whiteness of pulp can reach above 83%. The innovation of this process is that it can be cold bleached. Generally, when lignin peroxidase is used for bleaching, the temperature needs to be controlled between 45 and 55 degrees, while cold bleaching can be completed only by controlling between 16- 19 degrees, which saves a lot of heating energy. Another innovation of this patent is that the bleaching solution can be treated by FYR6 soft rot fungi and then returned to the lignin degradation pool for recycling, thus achieving the goal of zero emission and no pollution. The production technology and technical content of this project are different from traditional chemical pulping and biological laboratory pulping methods. Compared with chemical pulping, biological pulping greatly saves energy. Comparison of biological pulping methods in the laboratory: the characteristics of the strains used are different. The strains used in the laboratory are aerobic bacteria, and the anaerobic bacteria used in this project need sunlight, which can be cold bleached, recycled and zero emissions.