PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL Volume 6, Number 1, 2020
RECYCLING The effect of the addition of primary fibers on the papermaking ability of wastepaper, Aleksandra Niska & Edyta Malachowska, Annals of Warsaw University of Life Sciences - Forestry and Wood Technology, No.108, 2019:104-110 . The effect of the addition of primary fibers on the papermaking ability of wastepaper. The rapid increase in paper production and consumption at the end of the 20thcentury contributed to the increasing difficulties connected with assurance of required resources base for paper industry and the utilization of the growing amount of paper waste. The wastepaper salvage and application of secondary pulps for paper production make a significant contribution to solving these issues, and these activities are justified based on ecology and economy. It must be said, however, that the addition of certain amount of primary fibers is necessary to ensure strength and others usable properties of produced paper. The authors have set themselves the goal of the examination of primary fibers addition on papermaking ability of wastepaper. Studies have shown that the addition of primary fibers to wastepaper has a positive impact on all examined strength properties of paper. Green ecofriendly bio-deinking of mixed office waste paper using various enzymes from Rhizopus microsporus AH3: efficiency and characteristics, Mohamed Sayed Hasanin et al, Cellulose (2020), online . Mixed office waste paper (MOWP) is a low cost, high quality and easily collected fiber source for the papermaking industry. Unfortunately, limits in the application of traditional deinking are related to the negative environmental impacts of using chemicals during the deinking process. Hence, enzymatic deinking has received growing attention in the last decade. This study investigates the effect of using the effective enzymes produced from Rhizopus microspores AH3 which is grown on watermelon peel waste (WPW) extract, as a bio-deinking method in the deinking of MOWP, which is difficult to recycle because of their ink type and printing process. The methodology involves preparation of samples, impregnation with water, enzymatic treatment, washing, papermaking, evaluation of the produced paper sheets. The evaluation includes determination of the optical and mechanical properties as well as topographic investigation via scanning electron microscope of produced paper sheets. The results showed that there is an improvement in both optical and mechanical properties of all paper sheets produced in this study. The best enhancement was for medium B30 which was extracted by boiling of WPW for 30 min. This treatment gave high enhancement because of the effect of the produced enzymes from Rhizopus microspores AH3, where cellulase, xylanase, lignin peroxidase, poly phenol oxidase and laccase were 1.62, 1.49, 1.38, 1.2 and 1.5 U/ml, respectively. Moreover, the tensile strain (maximum load) increased by about 77% as well as the brightness percentage achieved about 86.78% and the deinking ability was increased approximately 16%. Environmental issues of pulp bleaching and prospects of peracetic acid pulp bleaching: A review, Nirmal Sharmaab et al, Journal of Cleaner Production, Vol.256 . To meet the demand of pulp and paper as well as the environmental legislation the pulp production with eco-friendly approach is desired. This paper presented the state of affairs of Indian and world pulp and paper industry. It also reviewed the discharge of toxic substances from pulp bleaching process and the alternatives for reduction of these toxic substances from pulp bleaching process. The pulp and paper industry is continually changing the bleaching process to minimize the use of chlorine and chlorine based compounds in order to satisfy regulatory and market demands. Imminent to have the minimum impact on environment from bleach plant peracetic acid is the prospective candidate. Use of peracetic acid is a promising technology as it has the capability to reduce/replace chlorine based compounds from pulp bleaching process. This paper
Technical Abstracts
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