Groundwater circulation well system with pressure-adjustable hydrodynamic cavitation

Patent metadata

Field	Value
Publication number	US-11912595-B2
Application number	US-202318112588-A
Country	US
Kind code	B2
Filing date	Feb 22, 2023
Priority date	Feb 28, 2022
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

The present invention relates to a groundwater circulation well system with pressure-adjustable hydrodynamic cavitation, including a circulation well body, a sucked and injected water circulation assembly and a hydrodynamic cavitator. The sucked and injected water circulation assembly is based on a water suction and injection pump. The hydrodynamic cavitator is provided, inside a vortex chamber, with a vortex water inlet column capable of changing a water passing aperture. The hydrodynamic cavitator is capable of changing a bubbling pressure and a breaking pressure of hydrodynamic cavitation bubbles in the vortex water inlet column. The hydrodynamic cavitator generates vortices in the circulation well body to accelerate uniform mixing of a remediation agent and the groundwater. Energy from collapsing and bursting of the hydrodynamic cavitation bubbles activates the remediation agent such that contaminants in the groundwater are efficiently degraded.

First claim

The invention claimed is:

1. A groundwater circulation well system with pressure-adjustable hydrodynamic cavitation, the system comprising a plurality of hydrodynamic cavitators ( 17 ) which are suspended in a circulation well and produces a hydrodynamic cavitation effect for groundwater under different operating conditions, wherein
each of the hydrodynamic cavitators ( 17 ) is provided with a vortex chamber ( 18 ) and a negative pressure chamber ( 12 ) in a flow direction of the groundwater such that hydrodynamic cavitation bubbles generated in the vortex chamber ( 18 ) of each of the hydrodynamic cavitators ( 17 ) by the contaminated groundwater are capable of collectively breaking in the negative pressure chamber ( 12 ) based on a sudden pressure change, energy from collapsing and bursting of the hydrodynamic cavitation bubbles being capable of activating a remediation agent to effectively degrade organic contaminants in the groundwater; and
each of the hydrodynamic cavitators ( 17 ) is provided, inside the vortex chamber ( 18 ) thereof, with a plurality of vortex water inlet columns ( 15 ) capable of changing a water passing aperture, in a manner that enables the contaminated groundwater to generate the hydrodynamic cavitation bubbles,
each of the hydrodynamic cavitators ( 17 ) is capable of changing a bubbling pressure and a breaking pressure of the hydrodynamic cavitation bubbles based on adjustment of a width and length of the water passing aperture of each of the vortex water inlet columns ( 15 ),
wherein the hydrodynamic cavitators ( 17 ) are arranged in parallel in the circulation well according to sizes of the hydrodynamic cavitators ( 17 ), and each of the hydrodynamic cavitators ( 17 ) is provided with the vortex water inlet columns ( 15 ) arranged in its vortex chamber ( 18 ) according to the rate of flow to be treated,
wherein the vortex water inlet columns ( 15 ) for generating the hydrodynamic cavitation bubbles are arranged at an outlet at a tail end of the vortex chamber ( 18 ) of each of the hydrodynamic cavitators ( 17 ), outlets at tail ends of the vortex water inlet columns ( 15 ) are connected to an inlet end of the negative pressure chamber ( 12 ) such that the hydrodynamic cavitation bubbles generated by passing through the vortex water inlet columns ( 15 ) are capable of directly entering the negative pressure chamber ( 12 ); and the hydrodynamic cavitation bubbles break and burst under the effect of a sudden pressure change, and energy generated from bursting is transferred to adjacent hydrodynamic cavitation bubbles to accelerate the process of collective breaking of the hydrodynamic cavitation bubbles.

2. The system according to claim 1 , wherein:
the water passing aperture is capable of changing a flow velocity of groundwater in the water passing aperture based on adjusting a cross-sectional size of the water passing aperture, to form the bubbling pressure adapted to flow conditions of groundwater at a current remediation stage or point; and the water passing aperture is capable of controlling growth time of the hydrodynamic cavitation bubbles based on changing a flow distance of the hydrodynamic cavitation bubbles in the water passing aperture, to adjust the breaking pressure to be adapted to the flow conditions of groundwater at the current remediation stage or point, such that each of the hydrodynamic cavitators ( 17 ) is capable of controlling a number of the hydrodynamic cavitation bubbles generated, growth time and breaking timing thereof, based on the bubbling pressure and the breaking pressure which are adjustable.

3. The system according to claim 2 , wherein each of the hydrodynamic cavitators ( 17 ) is configured in such a manner that each of the vortex water inlet columns ( 15 ) which is arranged at a different radial positions in the vortex chamber ( 18 ) of each of the hydrodynamic cavitators ( 17 ) is configured with a water passing apertures of a different optimized size.

4. The system according to claim 3 , wherein the contaminated groundwater is capable of generating the hydrodynamic cavitation bubbles based on each of the hydrodynamic cavitators ( 17 ), each of the hydrodynamic cavitators ( 17 ) is provided with a plurality of rotating mechanisms of different sizes for generating vortices in the vortex chamber ( 18 ) of each of the hydrodynamic cavitators ( 17 ) such that the groundwater entering the vortex chamber ( 18 ) of each of the hydrodynamic cavitators ( 17 ), disturbed by the rotating mechanisms, generates vortices of different sizes to accelerate uniform mixing of an oxidizing agent with organic contaminants in the groundwater, wherein:
the plurality of rotating mechanisms of different sizes arranged at water inlet front ends of the vortex water inlet columns ( 15 ) are configured to generate low-pressure vortex cores capable of increasing the number of the hydrodynamic cavitation bubbles generated.

5. The system according to claim 4 , wherein part of the hydrodynamic cavitation bubbles flows with the groundwater to a tail end of the negative pressure chamber ( 12 ), bubble puncturing needles ( 8 ) arranged at a water outlet at the tail end of the negative pressure chamber ( 12 ) are capable of puncturing the hydrodynamic cavitation bubbles which flow from the vortex water inlet columns ( 15 ) into the negative pressure chamber ( 12 ) and do not break by itself under a sudden pressure change; and
large rotating blades ( 20 ) for generating a large-size vortex are provided on an agitation rotating shaft ( 11 ) arranged coaxially with the vortex chamber ( 18 ) of each of the hydrodynamic cavitators ( 17 ) and the negative pressure chamber ( 12 ), the agitation rotating shaft ( 11 ) being connected to a vortex chamber base ( 13 ) arranged at the tail end of the vortex chamber ( 18 ) of each of the hydrodynamic cavitators ( 17 ) and to a negative pressure chamber base arranged at the tail end of the negative pressure chamber ( 12 ), respectively, in a manner capable of maintaining a position and height of each of the hydrodynamic cavitators ( 17 ); and small rotating blades ( 16 ) for generating small-size vortices are arranged at the front ends of the vortex water inlet columns ( 15 ) and connected to the vortex water inlet columns ( 15 ) by means of blade fixing rods ( 28 ).

6. A hydrodynamic cavitator, wherein the hydrodynamic cavitator ( 17 ) comprises a vortex chamber ( 18 ) for generating vortices and hydrodynamic cavitation bubbles, wherein, the vortex chamber ( 18 ) is provided with a plurality of vortex water inlet columns ( 15 ), and each of the vortex water inlet columns has a water passing aperture with an adjustable length and width, in such a manner that the groundwater with different flow conditions is capable of undergoing an adjustable hydrodynamic cavitation effect in the vortex chamber ( 18 ), such that the hydrodynamic cavitator ( 17 ) is capable of adjusting a bubbling pressure and a breaking pressure of the hydrodynamic cavitation bubbles based on each of the vortex water inlet columns ( 15 ) which has the water passing aperture with an adjustable length and width, to control a number of the hydrodynamic cavitation bubbles generated, and growth time and breaking timing thereof, wherein the hydrodynamic cavitator ( 17 ) is provided with a vortex chamber ( 18 ) and a negative pressure chamber ( 12 ) in a flow direction of groundwater such that the hydrodynamic cavitation bubbles generated in the vortex chamber ( 18 ) by contaminated groundwater are capable of collectively breaking in the negative pressure chamber ( 12 ) based on a sudden pressure change, energy from collapsing and bursting of the hydrodynamic cavitation bubbles being capable of activating a remediation agent to effectively degrade organic contaminants in the groundwater.

Assignees

• Univ Chengdu Technology

Inventors

• Pu Shengyan
• Ma Hui
• He Yuming
• Wang Xiaoguang
• Zeng Guangyong
• Chen Yi
• Yu Dong
• Ji Wenwen

Classifications

• C02F1/72 Primary

  by oxidation {(C02F1/4672 takes precedence)} · CPC title

• C02F1/34 Primary

  with mechanical oscillations · CPC title

• C02F1/722

  Oxidation by peroxides · CPC title

• B09C1/002

  involving in-situ ground water treatment · CPC title

• B09C1/08

  chemically · CPC title