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Performance evaluation and solidification mechanism of soybean urease combined with gypsum-urea for improving saline
Hang Shu1, Siqi Li1, Qiang Ma1
1Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei Key Laboratory of Environmental Geotechnology and Ecological Remediation for Lake & River, Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, Hubei University of Technology, No.28, Nanli Road, Hong-shan District, Wuhan, Hubei Province, 430068, China; School of Civil Engineering, Architecture and Environment, Hubei University of Technology, No.28, Nanli Road, Hong-shan District, Wuhan, Hubei Province, 430068, China.
Abstract:
The treatment of soil salinization and the utilization of industrial solid waste resources are key technical bottlenecks that need to be overcome in environmental engineering. In this study, a synergistic solidification technology based on soybean urease biocatalysis and gypsum-urea co-crystals was innovatively constructed to realize the functionalized improvement of saline soil. The study systematically carried out the mechanical property test, disintegration resistance evaluation, and microscopic mechanism analysis of the solidified soil with different gypsum-urea contents, revealing the multi-scale reinforcement mechanism of the synergistic bio-mineral solidification effect. The test results show that this technology can significantly improve the unconfined compressive strength of saline soil (up to 39.1 %) and provide soil with excellent disintegration resistance. While providing the necessary calcium ions and urea, gypsum-urea also reacts with soybean urease to generate calcium carbonate to fill the pores, insulating water and reducing water-salt migration. This technology not only opens up a new path for the high-value utilization of industrial solid wastes such as desulfurization gypsum but also demonstrates significant engineering application potential and environmental benefits, providing innovative solutions for the green treatment of saline soil.
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