Irradiation based clean and energy efficient thermochemical conversion of biowaste into paper

• Published in: Journal of cleaner production 2019-10, Vol.233, p.893-902
• Main Authors: Pathak, Shailesh, Saxena, Prateek, Ray, Amiya Kumar, Großmann, Harald, Kleinert, René
• Format: Article
• Language: English
• Subjects: Biowaste; Chemi-thermomechanical pulping; Chemical impregnation; Energy efficiency; Irradiation
• ISSN: 0959-6526; 1879-1786
• DOI: 10.1016/j.jclepro.2019.06.042

The advancement in plastic and plastic based products in last two decades has imposed a serious threat to the environment. This has led to an increase in the demand for sustainable and biobased products. Paper and paper products are good alternatives to their plastic counterparts. A key element of paper industry is the raw material (wood, bamboo and nonwood agricultural residues such as bagasse, straws etc.) from which pulp is produced. The pulp is then utilized for production of paper. There are many pulping processes to prepare pulp of various qualities. For fine grade pulp, chemical pulping is used. The chemical pulp is produced by soda, kraft and sulphite pulping processes. However, for newsprint grade pulp, stone ground wood (SW), thermomechanical (TMP), chemi-thermomechanical (CTMP), chemi-mechanical (CMP) or refiner mechanical (RMP) corresponding pulping processes are employed. The method of pulp preparation (pulping process) consumes large amount of energy and chemicals. A new pulping process with electron irradiation using biowaste (bagasse) as a raw material is discussed in this work. Bagasse pulping process is found to reduce about 50% of energy consumption during pulping process. The process is referred to as ‘ECTMP’ (Energy Efficient Chemi-Thermo Mechanical Pulping). The paper produced from aforesaid method also reflected no loss of strength properties with respect of TMP reference pulps. Henceforth, preliminary calculation based on experimental results shows that the proposed bagasse ECTMP process explored the scope of energy savings of the order of 50%. •Energy efficient thermochemical process for biowaste conversion into paper was explored.•The effects of high energy electron irradiation pre-treatment were investigated.•Chemical pretreatment improved the strength properties of paper.•Specific energy consumption of bagasse pulping was significantly reduced.•The approach of pre-irradiation can be implemented for other raw materials also.