小口径浅层地下水监测井便携式清淤设备的研发与应用OA

In recent years,a large number of small-diameter shallow groundwater environmental monitoring wells with PVC casings has been built in Hunan province.Affected by factors such as improper installation of water-filtering devices,unreasonable particle size gradation of filter materials,PVC pipe breakage and sediment deposition,these monitoring wells are generally silted up,which affects the water sampling work.Traditional desilting methods are likely to damage the well wall in such monitoring wells,and are difficult to implement due to site limitation,resulting in the abandonment and reconstruction of the silted monitoring wells and leading to resource waste.To address these issues,the institute has developed a set of portable desilting equipment integrated on a conventional pickup truck.This equipment combines two desilting processes:positive circulation and reverse circulation,in the former process,high-pressure airflow is used to impact and stir the sediment,while in the latter process,a gas-liquid mixer is used to create negative pressure and remove the sediment.Through the desilting practices on 30 monitoring wells in various cities and prefectures of Hunan province,the results showed that the siltation rate of 24 monitoring wells was less than 5％after dredging,achieving the expected goal,significantly reducing the abandonment and reconstruction of monitoring wells,improving the utilization rate of monitoring wells,and achieving good economic and social benefits.In the future,this equipment will be continuously optimized to improve its adaptability under harsh working conditions.