In the quest to find sustainable and cost-effective solutions for sludge management, a team of researchers from Jiangsu Port Construction Group Co., Ltd. and Nanjing Hydraulic Research Institute has made a significant breakthrough. Their study, published in *Yantu gongcheng xuebao* (translated as *Rock and Soil Mechanics*), explores the combined solidification of sludge using industrial wastes reinforced alkali slag-cement, offering promising implications for the energy and construction sectors.
The research, led by FU Huaihe of Jiangsu Port Construction Group Co., Ltd., and ZHANG Mingzhi of Nanjing Hydraulic Research Institute, addresses a critical challenge in the industry: the deterioration of strength in alkali slag-cement cured sludge. “We found that while alkali slag is beneficial, its excessive use can compromise the mechanical properties of the cured sludge,” explains FU. To mitigate this issue, the team introduced various industrial waste slags to enhance the mechanical properties of the sludge.
The study involved a series of unconfined compressive strength tests and scanning electron microscope (SEM) tests on six different types of industrial waste slag-alkali slag-cement cured sludges. The results were compelling. “Blast furnace slag showed remarkable improvement in the short term, while calcium carbide slag demonstrated the best long-term unconfined compressive strength,” notes ZHANG. This dual-phase enhancement strategy could revolutionize sludge treatment processes, making them more efficient and sustainable.
The micro-mechanisms of the cured sludge were further clarified through SEM analysis, providing a solid foundation for future design and implementation. “Our findings offer a practical solution for large-scale sludge treatment projects, particularly those involving dredged sludge,” adds FU. This research not only advances the field of geotechnical engineering but also holds significant commercial potential for the energy sector, where waste management and resource optimization are paramount.
As the world grapples with increasing waste and environmental concerns, innovative solutions like this one are crucial. The study’s insights could pave the way for more effective and eco-friendly sludge management practices, ultimately benefiting both the industry and the environment. With the detailed analysis and practical applications outlined in their research, FU, ZHANG, and their team have set a new benchmark in the field, inspiring further exploration and development in sludge treatment technologies.