PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 9, Number 3, 2023
The performance and microbial community of anaerobic membrane bioreactor for high calcium papermaking wastewater treatment, Mingchao Zhu, Jingwei Wang, Danni Pei, Ji Sun, Yangze Lu, Zhaoxia Hu, Shouwen Chen & Na Li, Journal of Water Process Engineering , Vol. 56, 104311 (Dec. 2023). High calcium papermaking wastewater challenges anaerobic biological technology applications, leading to sludge calcification and unstable reactor operation. This study employed an anaerobic membrane bioreactor (AnMBR) to treat high-calcium papermaking wastewater (1000 mg/L) and achieved an average chemical oxygen demand removal efficiency of 90.1%. No significant accumulation of volatile fatty acids was observed during the entire experimental period. The methane production capacity decreased with the increasing inlet calcium ion concentration, and the maximum methane production rate in Stage 4 was 115.4 mL·(gVSS·d) −1 . The maximum transmembrane pressure reached was 4.33 kPa, and the sludge was primarily present in the form of flocs due to the hydraulic shear effects. Anaerolineaceae, Bacteroidetes_vadinHA17, Methanosaetaceae and Methanobacteriaceae were identified as the dominant bacterial species in Stage 4, correlating with the robust anaerobic digestion performance. In conclusion, the AnMBR exhibited a reliable and effective treatment method for high calcium papermaking wastewater. Ionic resource recovery for carbon neutral papermaking wastewater reclamation by a chemical self-sufficiency zero liquid discharge system, Yangbo Qiu, Sifan Wu, Lei Xia, Long-Fei Ren, Jiahui Shao, Jiangnan Shen, Zhe Yang, Chuyang Y Tang, Chao Wu, Bart Van der Bruggen & Yan Zhao, Water Research , Vol. 229, 119451 (1 Feb. 2023). Papermaking industry discharges large quantities of wastewater and waste gas, whose treatment is limited by extra chemicals requirements, insufficient resource recovery and high energy consumption. Herein, a chemical self-sufficiency zero liquid discharge (ZLD) system, which integrates nanofiltration, bipolar membrane electrodialysis and membrane contactor (NF-BMED-MC), is designed for the resource recovery from wastewater and waste gas. The key features of this system include: 1) recovery of NaCl from pretreated papermaking wastewater by NF, 2) HCl/NaOH generation and fresh water recovery by BMED, and 3) CO 2 capture and NaOH/Na 2 CO 3 generation by MC. This integrated system shows great synergy. By precipitating hardness ions in papermaking wastewater and NF concentrate with NaOH/Na 2 CO 3 , the inorganic scaling on NF membrane is mitigated. Moreover, the NF-BMED-MC system with high stability can simultaneously achieve efficient CO 2 removal and sustainable recovery of fresh water and high-purity resources (NaCl, Na 2 SO 4 , NaOH and HCl) from wastewater and waste gas without introducing any extra chemicals. The environmental evaluation indicates the carbon-neutral papermaking wastewater reclamation can be achieved through the application of NF-BMED-MC system. This study establishes the promising of NF-BMED- MC as a sustainable alternative to current membrane methods for ZLD of papermaking industry discharges treatment. WOOD PANEL A Dialdehyde Starch-Based Adhesive For Medium-Density Fiberboards, Nicolas Neitzel, Reza Hosseinpourpia & Stergios Adamopoulos, BioResources , 2023, Vol. 18(1), 2155-2171 (2023). Bio-based adhesives have gained considerable attention in the last years as more sustainable and healthier alternatives to the formaldehyde-based adhesives used today in wood-based panel manufacturing. In this study, dialdehyde starch (DAS) with various aldehyde contents was prepared by using sodium metaperiodate as an oxidizing agent. Characterizations were performed by employing Fourier-transform infrared spectroscopy, nuclear magnetic resonance, and thermal stability analysis. Different
Technical Abstracts
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