PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 12, Number 1, 2026
“From Pulper rejects to paper mill resources through double-stage thermal pyrolysis”, Letizia Marchetti, Mariangela Guastaferro, Marco Vaccari, Federica Annunzi, Mirco Faè, Leonardo Tognotti, Cristiano Nicolella, Journal of Environmental Management , Vol.389, Aug. 2025, 126014. This study investigates the transformation of pulper reject (PR), a challenging industrial waste from paper recycling, into energy resources via dual-stage pyrolysis. As paper recycling rates rise, the sustainable management of PR becomes increasingly critical. Despite its strong commitment to circular economy principles, the paper industry generates significant waste. Integrating PR valorization into the energy demands of paper mills enhances resource efficiency while reducing environmental impact. Characterization of PR from an Italian paper mill confirmed its potential for thermal and chemical valorization despite its heterogeneity. Pyrolysis tests achieved high conversion rates, yielding energy-rich gas and oil with low heating values of 33MJ/kg and 32MJ/kg, respectively. The system demonstrated resilience to feedstock variability, ensuring consistent performance. Process simulation scaled these findings to an industrial level, showing that 1800kg/h of wet PR could generate over 1300kg/h of superheated medium- pressure steam and approximately 2MWe of electrical power. Environmental assessments indicated a 76% reduction in CO 2 emissions compared to fossil fuels, qualifying the gaseous fuel as a renewable Recycled Carbon Fuel under REDIII regulations established by the European Union. This study highlights the technical and environmental feasibility of PR valorization, supporting decarbonization in the paper industry. Further research should refine kinetic models and waste characterization to enhance process scalability and optimize “Treatment of wastewater resulting from paper industry using integrated coagulation, sedimentation and filtration process”, Emad Hamdy El-Gohary, Amro A. El bazb, Ahmed M. Magdy, Ibrahim A. Hendyd, J. Ecol. Eng ., 26(11), 2025, 284-298. A study has been done on the treatment of effluent wastewater resulting from pulp and paper mills using the integrated coagulation, sedimentation and filtration process. Three of the most effective coagulants have been evaluated: alum, ferric chloride, and poly aluminum chloride (PAC) for the chemical precipitation stage and geotextile filter for the filtration process. The optimum dose of alum, ferric chloride, and PAC used were 25ppm, 5ppm, and 100ppm, respectively, which reduce COD by 80%, 81%, and 82% and reduced TSS by 97%, 96%, 95% respectively. A comparison between the three chemicals in performance, dose, price and sourcing was done. As a result, ferric chloride with a dose of 5ppm was the best coagulant which was used as primary treatment. The effect of using geotextile filter as secondary processed treatment by plain or chemical coagulation was also tested and evaluated. Results showed that using a geotextile filter as a slow rate filter after plain sedimentation provides realistic and better operational results, with a running time of up to 13 and 6.5 days before reaching 100% clogging at a filtration rate of 2 and 5m 3 /m 2 /d respectively. While using geotextile filter after chemical precipitation increase the running time of the filter up to 16.5 and 7.6 days before reaching 100% clogging at a filtration rate of 2 and 5m 3 /m 2 /d respectively. The results also showed that using plain sedimentation before geotextile filtration yields good results without the need to add an expensive chemical coagulant, as the COD removal ratio reaches to 85 and 90% at filtration rate of 5 and 2m 3 /m 2 /d respectively and the TSS removal ratio reaches to 100%. industrial applications. WATER TREATMENT “A comparative study of four advanced oxidation processes for pulp and paper secondary effluent: Balancing pollutant removal, chlorine species generation and ecotoxicological impact”, Xinyue Cao, Wanlin Lei, Chenxi Li, Yan Liu, Journal of Environmental Chemical Engineering , Vol.14(2), Apr. 2026, 121727. Advanced oxidation
Technical Abstracts
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