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Microbial-mediated coal gangue reclamation : enhancing alfalfa growth with potassium and phosphorus-solubilizing bacteria

Gu Wenzhe, Zhang Xinfu, Liu Mingwu, Zhao Mengye, Wang Zhigang, Liu Lang, Wang Yaya

Archives of Environmental Protection

2025

Vol. 51, no. 2

73--82

Large accumulations of coal gangue (CG) pose significant environmental challenges, including land occupation, soil degradation, water contamination, and air pollution. Therefore, the ecological and sustainable utilization of CG is urgently needed. This study aimed to isolate microorganisms from various environmental samples that are capable of solubilizing potassium and phosphorus in CG. The bacteria exhibiting the greatest solubilization potential were identified and characterized, and their effects on alfalfa growth were evaluated in pot experiments using soil mixtures of CG and sandy soil. The findings indicated that Bacillus pseudomycoides and Bacillus amyloliquefaciens significantly improved alfalfa germination rates, whereas Citrobacter freundii and Bacillus velezensis were effective in enhancing its growth. These results suggest a promising approach for the clean and sustainable utilization of CG through the application of these microorganisms.

Development and validation of a wave-propelled semi-submersible unmanned vehicle

Tian Yingyuan, Li Weijia, Wang Zhigang

Polish Maritime Research

2024

nr 4

31--42

Ocean observation and exploration technologies are crucial for marine environmental protection and resource development, but traditional tools have limitations in terms of operating time, coverage, and cost. Wave gliders, which offer advantages such as long duration, wide range, and low cost, are a promising solution, but their low speed and weak manoeuvrability hinder their application, due to poor collision avoidance and survivability. This study proposes a novel wave-propelled semi-submersible unmanned vehicle (WPSUV) to overcome these disadvantages. The WPSUV features a submerged main structure for navigation and autonomous collision avoidance through rapid buoyancy adjustment. Modelling, computational hydrodynamic and motion simulations, and functional and performance testing at sea demonstrate the feasibility and superior performance of the WPSUV compared to conventional wave gliders. The proposed WPSUV significantly enhances collision avoidance through diving, reduced visual target and wind resistance with minimal structures above the waterline, and improved stability due to its lower centre of gravity. This slightly positively buoyant vehicle with a high lift-to-drag ratio can effectively harness wave kinetic energy and achieve favourable wave-following characteristics. In addition, the submerged main structure provides protection against surface hazards and allows for stealthy operation. This novel wave-propelled and near-surface unmanned underwater vehicle has the potential to revolutionise marine observation and exploration, and to enable safe, reliable, and long-term monitoring of the marine environment.