Huyi Zhou,Shanming Han,Kuizhong Shen,Mengke Zhao,Chen Huang,Guigan Fang,Yiqiang Wu,Hongying Huang,Zhibin He
In this study, the effect of aerobic fermentation pretreatment on bio-mechanical pulping of rice straw was investigated with compound bacterial agents (2 geobacillus sp, 1 parageobacillus sp and 4 thermos sp). The microbial community, chemical composition, surface morphology, crystal index and other parameters were monitored at various time intervals during the aerobic fermentation process. The chemical constituents of rice straw (mainly cellulose, hemicellulose and lignin) were partly degraded and dissolved in the fermentation process, leading to increased surface roughness and crystallinity index. The bio-mechanical pulping process was optimized in terms of Canadian freeness standard (CSF), specific energy consumption (SEC), water retention value (WRV), pulping yield, and physical properties of the resultant pulp. Under the optimal process conditions, the fermentation pre-treatment resulted in about 54% energy saving, 13% WRV improvement, and 81% increase in tensile strength at a given pulp freeness.
Lingrui Lin,Jie Yang,Shuzhen Ni,Xiu Wang,Huiyang Bian,Hongqi Dai
Generally, the mechanical strength and stiffness of old corrugated cardboard (OCC) waste paper are decreased after multiple recycling procedures. Surface sizing starch , which is extensively used in the surface sizing of paper making, accumulates after dissolving from the fibers and is transformed into pollutant during the OCC re-pulping process. To overcome the pollution and reutilization problem of the waste starch during the recycling process of OCC paper, waste starch was ionized using hydrogen peroxide (H 2 O 2 ) to improve the mechanical properties of OCC paper during the reutilization. The results showed that the carboxyl group of waste starch increased with an increasing degree of ionization, resulting in enhanced copper ion adsorption capacity . Furthermore, the retention rate of the modified starch in the wet-end increased from 18.0% to 48.2%. The OCC paper presented the highest burst index and tensile strength of 8.94 kPa m 2 /g and 112.5 N m/g, respectively, when MS-2 was added. This work has great significance for implementation of the cleaning production of OCC waste papers and the reutilization of the waste starch.
危险品化学品经营许可证（带存储）