Industrial scale-up of fiber recovery technology from mixed office waste fine screen rejects

• Published in: Bioresources 2020-08, Vol.15 (3), p.6420-6430
• Main Authors: Su, Zhen-Hua, Fan, Shu-Jie, Zhang, Yu, Tian, Chao, Gong, Chen, Ni, Jian-Ping, Yang, Bin, Peng, Feng, Korkko, Mika, Mahmoud, Mohamed S.
• Format: Article
• Language: English
• Subjects: Bursting strength; Consistency; Consumption; Energy consumption; Environmental protection; Pulp; Pulping; Raw materials; Recovery; Recycling; Running; Tear strength; Technology; Tensile strength
• ISSN: 1930-2126; 1930-2126
• DOI: 10.15376/biores.15.3.6420-6430

Industrial-scale testing was performed for fine screen reject recovery technology with a mixed office waste (MOW) pulping line. Results showed that the recovery system removed macrostickies and dirt specks with an efficiency of 95.7% to 98.3% and 51.5% to 76.8%, respectively. These results were not affected by the running consistency (0.26% to 1.44%). The recovery system improved the physical strength of the pulp. Relative to untreated rejects, the tensile index increased 5.1% to 15.2%, the tear index increased 6.6% to 11.4%, and the breaking index increased 6.6% to 25.7%. Running consistency had no obvious effects on tensile strength and tear strength, but bursting strength increased with increasing running consistency (%). The volume energy consumption (y) increased with increasing running consistency (x), and a linear relationship of y = 0.73x + 4.2191 (R² = 0.9466) was observed. The specific energy consumption (y) of the pulp decreased with increasing running consistency (x), and the relationship could be expressed as y = 499.67x-0.906 (R² = 0.9959).