Reagent Regeneration of Water Intake Wells Using Jet Pumping Units

The paper presents three variants of installation schemes for circulating-reagent treatment of water intake well screens, which allow to use both liquid and powder reagents. The main components of the installations are: a reagent tank, one or two reagent pumps connected in series, a pipeline system, a jet pump installed under the liquid level in the water intake well, and a corrugated plastic pipe placed with an annular gap inside the screen being cleaned. The task of the process equipment is to create targeted circulation of the reagent outside the corrugated pipe in the screen and near-screen zone of the well that has reduced the flow rate. This ensures efficient and uniform processing of the screen, reduces the volume of reagent migration into the aquifer. A calculation scheme for reagent movement in the system (reagent tank – screen – riser pipe – jet pump – reagent tank) has been developed. A system of equations for reagent movement has been compiled. The paper describes a methodology for calculating a system of equations using a graph-analytical method, which allows one to obtain the values of the circulation flow rate and flushing speed in a concentric annular channel between the internal surfaces of a screen and a corrugated plastic pipe. The methodology also allows to select the parameters of the technological equipment of the installation for processing water intake wells with a given depth and position of the static water level. An example of calculation is given.

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