微波土壤消毒技术与装备研究进展

    Research progress on microwave soil disinfection technology and equipment

    • 摘要: 土壤消毒是防治土传病虫害的有效措施,但传统化学方法存在生态环境与健康风险,亟需推动绿色物理防控技术发展。该研究系统综述了微波土壤消毒技术的研究进展,此技术通过微波辐射的热/非热效应协同作用实现土壤害虫及病原菌灭活,具有环保优势。该研究首先分析了不同频段(915、2450 MHz)微波的穿透特性及其在深层/浅层消毒中的应用差异;进而从微波-土壤互作机制角度,总结了工作参数(频率、功率等)与土壤物理特性对电磁场分布及消毒效果的影响规律,阐述了微波处理对土壤理化性质和微生物群落的调控效应。在装备研发方面,详细对比了国内外微波消毒设备的核心部件技术差异,指出中国在高功率微波发生器、智能控制系统等关键部件上的技术短板。针对当前存在的能效转化率低、深层消毒不均、生态安全性评估不足等瓶颈问题,提出未来应重点突破的研究方向:1)微波-土壤相互作用机理与非热效应机制研究;2)深层均匀高效消毒与能效优化技术研究;3)高功率微波发生器等核心部件与智能化控制系统研发。该文为微波土壤消毒技术的优化升级提供了理论参考和技术路线指引。

       

      Abstract: Planting area of the high value-added crops has been ever increasing in recent years, particularly with the agricultural intensification and scale. However, there is the large accumulation of the insect eggs and pathogenic bacteria in the soil during production, leading to the continuous cropping obstacles, as well as the soil borne pests and diseases. Alternatively, the soil disinfection is one of the most important measures to prevent and control the soil borne diseases and pests. However, the traditional chemical disinfection has often posed the ecological pollution and risks on the human and animal health. Therefore, it is an urgent need to develop the green and pollution-free physical prevention and control technologies. Among them, microwave soil disinfection can be one of the green physical application in sustainable agriculture. The microwave radiation can effectively kill the pests and pathogens in soil, while avoid the residual pollution of chemical agents. Microwave soil disinfection can be expected to fully meet the requirements of green agriculture. This study aims to systematically review the research progress of the microwave soil disinfection. Firstly, the thermal and non-thermal effects of the microwave radiation were introduced for the microwave technology. An analysis was made on its penetration in soil at the different frequency bands (915 and 2 450 MHz) and the application in various depths of soil. Among them, 915 MHz microwave was used to penetrate the soil at a deeper level, while 2 450 MHz microwave was suitable for the shallow disinfection. In addition, the mechanism of the microwave soil interaction was summarized to explore the influence of the microwave working parameters (frequency, power, and exposure time) and soil physical properties on the electromagnetic field distribution and disinfection. And there was the influence of the microwave treatment on the soil physicochemical properties and microbial communities. Furthermore, a comparison was provided on the technological differences between microwave soil disinfection equipment. And among them, the microwave disinfection equipment from developed countries was achieved in the commercial production. While the microwave disinfection equipment in China was still in the experimental prototype stage, indicating the significant gap in development level. Then, some main technological challenges were also proposed in the core components, such as the high-power microwave generators (microwave power supplies, and magnetrons) and intelligent control systems. Microwave disinfection shared some problems at present, including the uncontrolled depth of microwave disinfection, lack of uniformity, absence of core equipment components and intelligent systems, and insufficient ecological safety assessment. Future research should focus on the following directions: 1) Revealing the mechanism of the microwave soil interaction on the non-thermal effects; 2) Breakthrough the key technology of the microwave deep, uniform and efficient disinfection, in order to optimize the energy efficiency; 3) Accelerating the core components, such as the high-power microwave generators and the intelligent upgrade of equipment. This finding can provide the theoretical reference and technical route guidance to optimize microwave soil disinfection.

       

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