Valorization of sewage sludge for facile and green wood bio-adhesives production

A method is presented herein for the design of wood bio-adhesives using sewage sludge extracts (SSE). SSE was extracted from SS using deep eutectic solvents and processed with glycerol triglycidyl ether (GTE) to disrupt the secondary structure of proteins. An additive was also used to improve mechanical performance. The resulting bio-adhesive (SSE/GTE@TA) had a wet shear strength of 0.93 MPa, meeting the Chinese national standard GB/T 9846–2015 (≥0.7 MPa). However, the high polysaccharide content in SSE would weaken the mechanical properties of wood bio-adhesives. The key to improve bio-adhesive quality was the formation of a strong chemical bond via Maillard reaction as well as higher temperatures (140 °C) to reduce polysaccharide content via dehydration. This approach has lower environmental impact and higher economic efficiency compared to incineration and anaerobic digestion of sewage sludge. This work provides a new perspective on the high-value utilization of SS and offers a novel approach to developing bio-adhesives for the wood industry. © 2023

Authors
Xu Z.-X. , Tan Y. , Ma X.-Q. , Li B. , Chen Y.-X. , Zhang B. , Osman S.M. , Luo J.-Y. , Luque R.
Publisher
Academic Press Inc.
Language
English
Status
Published
Number
117421
Volume
239
Year
2023
Organizations
  • 1 School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China
  • 2 Zhoukou Normal University, School of Chemistry and Chemical Engineering, Henan,Wenchang Avenue, Zhoukou, China
  • 3 School of Energy and Environment, Southeast University, Jiangsu, Nanjing, 210096, China
  • 4 Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
  • 5 Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
  • 6 Peoples Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Str., Moscow, 117198, Russian Federation
  • 7 Universidad ECOTEC, Km. 13.5 Samborondón, Samborondón, EC092302, Ecuador
Keywords
Bio-adhesive; Bonding strength; Proteins; Sewage sludge; Water resistance
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