A computational fluid dynamics(CFD)numerical simulation and field experiment were used to investigate optimal operating parameters of high-pressure jet grouting equipment and clarify the boundary law of the injection ...A computational fluid dynamics(CFD)numerical simulation and field experiment were used to investigate optimal operating parameters of high-pressure jet grouting equipment and clarify the boundary law of the injection area in the remediation process.The response surface optimization design results show that the optimal injection pressure is 30 MPa,rotation speed is 23 r/min,commission speed is 30 cm/min,and the optimal injection diameter is 147.3 cm.Based on the CFD numerical simulation,the ratio of the injection core,turbulent zone,and seepage zone is approximately 1∶4∶2.The distribution law of jet core,turbulence zone and seepage zone at different cross-sections under 30 MPa operating conditions is as follows:The jet core radius is approximately 100 mm,the turbulence zone is mainly distributed at 100 to 500 mm,the seepage zone is mainly distributed at 500 to 700 mm,the seepage zone could be completed within 2 h,and the proportion of the three boundary zones in the injection zone is similar to that of the numerical simulation.This study provides theoretical parameters and practical reference for the remediation of deep pollution via in-situ chemical oxidation in the Loess Plateau soil environment.展开更多
有机污染物的反扩散、拖尾和反弹等问题严重影响传统原位化学氧化(In-Situ Chemical Oxidation,ISCO)技术对污染地下水的修复效果。药剂缓释技术可以实现对污染地下水的长时间持续修复,是保证原位化学氧化修复效果的有效方式。经过大量...有机污染物的反扩散、拖尾和反弹等问题严重影响传统原位化学氧化(In-Situ Chemical Oxidation,ISCO)技术对污染地下水的修复效果。药剂缓释技术可以实现对污染地下水的长时间持续修复,是保证原位化学氧化修复效果的有效方式。经过大量文献调研,介绍药剂缓释体-原位化学氧化(Controlled Release Materials-In-Situ Chemical Oxidation,CRM-ISCO)技术原理及缓释体材料组成,系统分析国内外CRM-ISCO技术修复地下水的研究现状及工程应用进展,总结技术应用存在的问题并对前景进行展望,以期为CRM-ISCO技术在我国有机污染地下水修复中的推广和应用提供参考。展开更多
基金The National Natural Science Foundation of China(No.41967043,52160003)the Natural Science Foundation of Gansu Province(No.20JR5RA461)+1 种基金the Key Project of China Railway Southwest Research Institute Co.,Ltd.(No.2018-KJ003-Z003-XB)the Industrial Support Program of the Higher Education of Gansu Province(No.2020C-40).
文摘A computational fluid dynamics(CFD)numerical simulation and field experiment were used to investigate optimal operating parameters of high-pressure jet grouting equipment and clarify the boundary law of the injection area in the remediation process.The response surface optimization design results show that the optimal injection pressure is 30 MPa,rotation speed is 23 r/min,commission speed is 30 cm/min,and the optimal injection diameter is 147.3 cm.Based on the CFD numerical simulation,the ratio of the injection core,turbulent zone,and seepage zone is approximately 1∶4∶2.The distribution law of jet core,turbulence zone and seepage zone at different cross-sections under 30 MPa operating conditions is as follows:The jet core radius is approximately 100 mm,the turbulence zone is mainly distributed at 100 to 500 mm,the seepage zone is mainly distributed at 500 to 700 mm,the seepage zone could be completed within 2 h,and the proportion of the three boundary zones in the injection zone is similar to that of the numerical simulation.This study provides theoretical parameters and practical reference for the remediation of deep pollution via in-situ chemical oxidation in the Loess Plateau soil environment.
文摘有机污染物的反扩散、拖尾和反弹等问题严重影响传统原位化学氧化(In-Situ Chemical Oxidation,ISCO)技术对污染地下水的修复效果。药剂缓释技术可以实现对污染地下水的长时间持续修复,是保证原位化学氧化修复效果的有效方式。经过大量文献调研,介绍药剂缓释体-原位化学氧化(Controlled Release Materials-In-Situ Chemical Oxidation,CRM-ISCO)技术原理及缓释体材料组成,系统分析国内外CRM-ISCO技术修复地下水的研究现状及工程应用进展,总结技术应用存在的问题并对前景进行展望,以期为CRM-ISCO技术在我国有机污染地下水修复中的推广和应用提供参考。
