PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 10, Number 1, 2024
WASTE TREATMENT “Influence of hygiene tissue paper used as an additive on the physicochemical and mechanical properties of CO2-cured belite- rich cement paste”, Kunal Krishna Das, Raju Sharma, Xuanru Wu & Jeong Gook Jang, Cement and Concrete Composites , Vol.145, Jan. 2024, 105317. The present study investigated the fresh, hardened, and physicochemical properties of CO 2 -cured belite-rich cement (BRC) paste incorporating hygiene tissue paper (HTP) as an additive. HTP was added at 0.5% and 1.0% by wt. of BRC paste. The BRC paste was prepared at a water-to-cement ratio of 0.4 and cured under water and carbonation. The results demonstrated that upon carbonation, the incorporation of HTP at 1.0% increases the CO 2 uptake and compressive strength of specimens by 18.60% and 22.29%, respectively. A pore structure analysis shows a decrease in the threshold pore size diameter with an increase in the HTP content for CO 2 - cured samples. An SEM analysis revealed precipitation and impregnation of calcites in and around the HTP microfiber particles. The incorporation of HTP under water curing on the other hand did not significantly influence the strength or the physicochemical properties. It was observed that HTP contributes to improving the properties of CO 2 -cured BRC paste in two ways; the porous structure of HTP provides pathways for the deep permeation of CO 2 into the matrix, and the surface of HTP offers an additional area for calcite precipitation. “Study on the pollutant emission characteristics of the co -combustion of high S/Cl waste mixed with recycled papermaking waste”, Min Lyu, Renjie Zou, Guangqian Luo, Yi Xiao, Haoyu Zhang, Tianyu Zhao, Xian Li & Hong Yao, Fuel , Vol.358, Part B, 15 Feb. 2024, 130355. Using solid waste to replace coal for power generation is one of the effective ways to reduce CO 2 emissions, but the incineration of some high-sulfur and high-chlorine solid waste will lead to the increase of pollutant emissions. This paper proposed a new way to self-control pollutant emissions by co-incinerating different solid wastes with specific properties. In this work, the recycled papermaking waste residue (RPR) and sludge (RPS) with high calcium content were chosen to co-combustion with high-sulfur and high-chlorine solid waste, and the emission characteristics and control mechanism of pollutants under co-combustion were explored. The primary calcium compound in the recycled papermaking solid waste was CaCO 3 . When RPR and RPS were mixed at a ratio of 1: 1, HCl could be fully captured, resulting in the least emissions. Pollutant emissions was controlled by adding RPR and RPS to high-sulfur textile dyeing sludge and polyvinyl chloride. The sulfur-fixing efficiency rose from 65 % to 91 % and the chlorine-fixing efficiency rose from 69 % to 93 % with an increase in Ca/(S + 0.5Cl) from 1 to 3. As the reaction temperature rose from 700 °C to 1000 °C, the sulfur-fixing efficiency and chlorine-fixing efficiency initially increased and subsequently dropped. The CaCO 3 in the material was rapidly decomposed at 800 °C, which accelerated the positive reaction rate with SO 2 and HCl, so that the sulfur-fixing efficiency and chlorine-fixing efficiency reached the maximum, which were 89 % and 92 %, respectively. CaSO 4 and CaClOH were the principal reaction products at the temperature range of 700 °C to 1000 °C. “New insights into toxicity reduction and pollutants removal during typical treatment of papermaking wastewater”, Fei Di , Donghui Han, Jinquan Wan, Guang Wang, Bin Zhu, Yan Wang & Yang Shou, Science of The Total Environment , Vol.915, 10 Mar. 2024, 169937. Papermaking wastewater contained various of toxic and hazardous pollutants that pose significant threats to both the ecosystem and human health. Despite these risks, limited research has addressed the detoxification efficiency and mechanism involved in the typical process treatment of papermaking wastewater. In this study, the acute toxicity of papermaking wastewater after different treatment processes was assessed using luminousbacteria, zebrafish and Daphnia magna ( D. magna ). Meanwhile,
Technical Abstracts
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