CN107643376B - A kind of experimental provision that the irrigation of simulation high-arsenic underground water influences groundwater environment - Google Patents

Abstract

The invention provides an experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment. Simulate high-arsenic groundwater, the simulated high-arsenic groundwater is prepared with anaerobic water, the interior of the simulation device is filled with a simulated soil layer, when the height of the three-way pipe changes, under the action of pressure difference, the The water level changes to simulate the groundwater environment under different conditions. The simulated high-arsenic groundwater flows into the simulation device. The device is discharged, and then flows into the monitoring pool, the tee pipe and the waste liquid pool in sequence. A number of water quality monitoring probes are placed in the monitoring pool. The water quality monitoring probes are used to continuously monitor water samples, and the waste liquid pool is used to collect the outflowing water sample.

Description

An experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment

technical field

The invention relates to the technical field of groundwater simulation, in particular to an experimental device for simulating the influence of high-arsenic groundwater irrigation on the groundwater environment.

Background technique

Arsenic is a toxic metalloid element. Chronic intake of arsenic-containing groundwater can cause endemic arsenic poisoning, causing diseases of the skin, bladder, kidneys, blood vessels, and even cancer. Groundwater high in arsenic is distributed in more than 70 countries around the world, affecting more than 150 million people. In China alone, about 20 million people are under the threat of high arsenic groundwater. In order to improve and remediate high-arsenic groundwater more efficiently, it is key to identify the main controlling factors of arsenic migration and enrichment in high-arsenic groundwater systems.

Temperature, pH, redox environment, and coexisting active substances all affect the form and distribution of arsenic in groundwater. High-arsenic groundwater is mainly distributed in rural areas, and irrigation activities generally occur in rural areas. Such irrigation activities will change the environmental substances and environment of groundwater. In order to better study the impact of high-arsenic groundwater irrigation activities on groundwater environment, field experiments and simulation experiments are needed. Combined, the mechanism of action is studied from different scales.

Contents of the invention

In view of this, the present invention provides an experimental device for simulating the impact of high-arsenic groundwater irrigation on groundwater environment with simple structure, good simulation effect and high feasibility.

The invention provides an experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment, comprising an anaerobic operation box, a simulation device, a monitoring pool, a three-way pipe and a waste liquid pool connected in sequence, the three-way pipe can move up and down, The anaerobic operation box and the simulation device are connected through a first pipeline, the monitoring pool and the simulation device are connected through a second pipeline, and the monitoring pool and the first nozzle of the tee pipe are connected through a third pipeline , the second nozzle of the three-way pipe is connected to the waste liquid pool through the fourth pipe, the third nozzle of the three-way pipe is connected with the atmosphere, and the simulated high-arsenic groundwater is contained in the anaerobic operation box, so The simulated high-arsenic groundwater is used to simulate the groundwater containing arsenic, the simulated high-arsenic groundwater is prepared with anaerobic water, the simulation device is filled with a simulated soil layer, the simulated soil layer is used to simulate the soil medium, and the three When the height of the through pipe changes, the water level of the simulation device changes under the action of the pressure difference, thereby realizing the simulation of the groundwater environment under different conditions. The simulated high-arsenic groundwater flows into the simulation device through the first pipeline, and is Under the action, the simulated high-arsenic groundwater seeps in the simulation device, and the simulated high-arsenic groundwater that has completed the seepage is discharged from the simulation device, and then flows into the monitoring pool, the tee pipe and the waste liquid pool in sequence, and several water quality monitoring probes are placed in the monitoring pool , the water quality monitoring probe is used to realize continuous monitoring of water samples, and the waste liquid pool is used to collect outflowing water samples.

Further, the simulation device includes a simulation device main body, an upper end of the simulation device arranged above the simulation device main body, and a lower end of the simulation device arranged below the simulation device main body, and the upper end of the simulation device is connected to the simulation device main body through a first flange Above, the upper end of the simulation device and the first flange are sealed by the first rubber sealing ring, the lower end of the simulation device is connected to the main body of the simulation device through the second flange, and the lower end of the simulation device is connected to the second flange. The space between the blue plates is sealed by the second rubber ring.

Further, a first water inlet is opened in the middle of the upper end of the simulation device, and one end of the first pipeline is connected to the upper end of the simulation device through the first water inlet, and a two-phase valve is set on the first pipeline to open the When the two-phase valve is used, the simulated high-arsenic groundwater flows into the main body of the simulation device, and a first water outlet is opened at the middle of the lower end of the simulation device, and one end of the second pipeline is connected to the lower end of the simulation device through the first water outlet. A three-phase valve is arranged on the second pipeline, one end of the three-phase valve communicates with the atmosphere, and one end of the three-phase valve communicated with the atmosphere is used for collecting water samples.

Further, a first small hole is provided on the side of the main body of the simulation device close to the upper end of the simulation device, and a vent valve is installed in the first small hole, and the vent valve is used to realize the gas between the interior of the main body of the simulation device and the atmosphere. exchange.

Further, a number of small holes are provided on the side of the main body of the simulation device, and these small holes are used to collect water samples along the longitudinal flow path.

Further, the first pipe, the second pipe, the third pipe and the fourth pipe are all rubber pipes, the three-way pipe is a glass three-way pipe, and the main body of the simulation device, the upper end of the simulation device and the lower end of the simulation device are all Made of transparent PVC material, the simulated soil layer is any one of quartz sand or clay, and arsenic and iron reagents are added to the anaerobic water.

Further, the height of the three-way pipe is not greater than the water level inside the main body of the simulation device, and a plastic mesh lining is installed at the bottom of the main body of the simulation device, and the pore size of the plastic mesh lining is smaller than the particle size of the simulated soil layer.

Further, a pump is connected to the first pipeline, and the simulated high-arsenic groundwater is transported to the simulation device through the pump, and a filter is installed in the first pipeline, and the filter is used to remove impurities in the simulated high-arsenic groundwater, A water distributor is provided inside the simulation device, and the water distributor is used to evenly distribute the simulated high-arsenic groundwater.

Further, the monitoring pool is provided with a second water inlet and a second water outlet, the position of the second water inlet is lower than that of the second water outlet, the second water inlet is connected with a second pipeline, and the The second water outlet is connected with the third pipeline.

Further, a lifting platform is arranged below the three-way pipe, and the lifting platform is used to fix the position of the three-way pipe and change the height of the three-way pipe.

The beneficial effects brought by the technical solution provided by the present invention are: the experimental device provided by the present invention has simple structure, high feasibility, good simulation effect, and is very helpful to the experimental research on the influence of groundwater environment; the experimental device provided by the present invention The anaerobic operation box is used to efficiently simulate the reducing anaerobic environment of high-arsenic groundwater, which has a wide application value; the experimental device provided by the invention uses a three-way pipe to control the water level of the simulation device, which is easy to operate and effectively reduces the interference of the experiment Variable; the experimental device provided by the present invention directly arranges the water quality monitoring probe in the monitoring pool, effectively avoids the error caused by taking out the test, and has a good continuous monitoring effect.

Description of drawings

Fig. 1 is a structural diagram of an experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment according to the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

Please refer to Fig. 1, an embodiment of the present invention provides an experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment, which includes an anaerobic operation box 1, a simulation device 2, a monitoring pool 3, and a tee pipe 4 connected in sequence With the waste liquid pool 5, the anaerobic operation box 1 and the simulation device 2 are connected by the first pipeline 11, the monitoring tank 3 and the simulation device 2 are connected by the second pipeline 12, the monitoring tank 3 and the tee pipe 4 The first One nozzle 41 is connected through the third pipe 13, the second nozzle 42 of the three-way pipe 4 is connected with the waste liquid pool 5 through the fourth pipe 14, and the third nozzle 43 of the three-way pipe 4 is connected with the atmosphere.

The simulated high-arsenic groundwater is filled in the anaerobic operation box 1. The simulated high-arsenic groundwater is used to simulate the groundwater containing arsenic. The simulated high-arsenic groundwater is prepared with anaerobic water, and different qualities of arsenic and iron are added to the anaerobic water according to the experimental requirements. Reagent, the first pipeline 11 is connected with a pump 111, and the simulated high-arsenic groundwater is transported to the simulation device 2 through the pump 111, and a filter 112 is installed in the first pipeline 1, and the filter 112 is used to remove impurities in the simulated high-arsenic groundwater; In the embodiment, the pump 111 adopts a peristaltic pump, and the peristaltic pump can deliver the simulated high-arsenic groundwater to the simulation device 2 at a constant flow rate, and the filter 112 adopts a syringe filter.

The simulation device 2 is filled with a simulated soil layer. The simulated soil layer is used to simulate the soil medium. The simulated soil layer is selected from quartz sand or clay according to the experimental requirements. In an embodiment of the present invention, quartz sand is selected for the simulation experiment.

The simulation device 2 comprises a simulation device main body 21, a simulation device upper end 22 arranged above the simulation device main body 21 and a simulation device lower end 23 arranged below the simulation device main body 21, and the simulation device upper end 22 is connected to the simulation device by a first flange 6. On the main body 21, the upper end 22 of the simulation device and the first flange 6 are sealed by a first rubber sealing ring (not shown in the figure), and the lower end 23 of the simulation device is connected to the main body 21 of the simulation device through the second flange 7, The lower end 23 of the simulation device and the second flange 7 are sealed by a second rubber ring. The interior of the simulation device 2 is provided with a water distributor 24. The water distributor 24 is used to evenly distribute the simulated high-arsenic groundwater close to the simulation device. The side of the simulation device main body 21 at the upper end 22 is provided with a first small hole 25, and a ventilation valve 26 is installed in the first small hole 25, and the ventilation valve 26 is used to realize the gas exchange between the inside of the simulation device main body 21 and the atmosphere.

The simulation device 2 and the three-way pipe 4 respectively connected to the atmosphere constitute a U-shaped communication pool structure. When the height of the three-way pipe 4 changes, the water level of the simulation device 2 changes under the action of the pressure difference, thereby realizing the simulation of different conditions. groundwater environment.

When using this experimental device to carry out simulation experiments, simulated high-arsenic groundwater flows into the simulation device 2 through the first pipeline 11, and simulates high-arsenic groundwater seepage in the simulation device 2 under the action of gravity, and completes the simulated high-arsenic groundwater flow from the simulation device 2, and then flow into the monitoring pool 3, the tee pipe 4 and the waste liquid pool 5 in sequence, and the waste liquid pool 5 is used to collect the outflowing water samples.

A first water inlet 221 is set in the middle of the upper end 22 of the simulation device, and one end of the first pipeline 11 is connected to the upper end 22 of the simulation device through the first water inlet 221. A two-phase valve 113 is set on the first pipeline 11, and the two-phase valve 113 is opened. When simulating high-arsenic groundwater flows into the main body 21 of the simulating device, a first water outlet 231 is opened at the middle position of the lower end 23 of the simulating device, and one end of the second pipeline 12 is connected to the lower end 23 of the simulating device through the first water outlet 231, and the second pipeline 12 is provided with a three-phase valve 121, wherein one end of the three-phase valve 121 communicates with the atmosphere, and one end of the three-phase valve 121 communicated with the atmosphere is used for collecting water samples.

The bottom of the main body 21 of the simulation device is equipped with a plastic mesh lining, and the aperture of the plastic mesh lining is smaller than the particle diameter of the simulated soil layer. In one embodiment, the aperture of the plastic mesh lining is 0.088mm.

The monitoring pond 3 is provided with a second water inlet 32 and a second water outlet 33, the position of the second water inlet 32 is lower than the position of the second water outlet 33, the second water inlet 32 is connected with the second pipeline 12, and the second water outlet 33 is connected with the third pipeline 13, and several water quality monitoring probes 31 are placed in the monitoring pool 3, and these water quality monitoring probes 31 are used to realize continuous monitoring of water samples.

The three-way pipe 4 can move up or down, and an elevating platform 8 is arranged below it. The elevating platform 8 is used to fix the position of the three-way pipe 4 and change the height of the three-way pipe 4. In order to prevent the backflow of the water sample, the three-way pipe 4 The height of is not greater than the water level inside the main body 21 of the simulation device.

A number of small holes 27 are provided on the side of the main body 21 of the simulation device, and these small holes 27 are used to collect water samples along the longitudinal flow path.

The first pipe 11 , the second pipe 12 , the third pipe 13 and the fourth pipe 14 are all rubber pipes, and the three-way pipe 4 is a glass three-way pipe.

The simulation device main body 21, the simulation device upper end 22 and the simulation device lower end 23 are all made of transparent PVC material, and the size of the simulation device main body 21 is selected according to the experimental requirements. In one embodiment, the inner diameter of the simulation device main body 21 is 8cm, length It is 1.5m and the wall thickness is 5mm.

The interface between the first pipeline 11 and the anaerobic operation box 1, the interface between the first pipeline 11 and the upper end 22 of the simulation device, the interface between the second pipeline 12 and the lower end 23 of the simulation device, the second pipeline 12 and the second water inlet 32 The interface of the third pipe 13 and the second water outlet 33, the interface of the third pipe 13 and the first nozzle 41, the interface of the fourth pipe 14 and the second nozzle 42 are all made of silicone rubber Coating seal.

The experimental device provided by the present invention has simple structure, high feasibility, and good simulation effect, and is of great help to the experimental research on the influence of groundwater environment; the experimental device provided by the present invention uses anaerobic operation box 1 to efficiently simulate high-arsenic groundwater The reducing anaerobic environment of the present invention has extensive application value; The experimental device provided by the present invention adopts the water level of three-way pipe 4 to control simulation device 2, is easy to operate, and has effectively reduced the disturbance variable of experiment; The experimental device provided by the present invention will water quality The monitoring probe 31 is directly arranged in the monitoring pool 3, effectively avoiding the error caused by taking out the test, and the continuous monitoring effect is good.

In this article, the orientation words such as front, rear, upper, and lower involved are defined by the parts in the drawings and the positions between the parts in the drawings, just for the clarity and convenience of expressing the technical solution. It should be understood that the use of the location words should not limit the scope of protection claimed in this application.

In the case of no conflict, the above-mentioned embodiments and features in the embodiments herein may be combined with each other.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. An experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment is characterized in that it comprises an anaerobic operation box, a simulation device, a monitoring pond, a three-way pipe and a waste liquid pool connected successively, and the three-way pipe can Moving up and down, the anaerobic operation box and the simulation device are connected through the first pipeline, the monitoring pool and the simulation device are connected through the second pipeline, and the monitoring pool and the first mouth of the tee pipe are connected through the first nozzle. Three pipes are connected, the second nozzle of the three-way pipe is connected to the waste liquid pool through the fourth pipe, the third nozzle of the three-way pipe is connected with the atmosphere, and the simulated high-arsenic Groundwater, the simulated high-arsenic groundwater is used to simulate the groundwater containing arsenic, the simulated high-arsenic groundwater is prepared with anaerobic water, the simulation device is filled with a simulated soil layer, and the simulated soil layer is used to simulate the soil medium, The simulation device and the three-way pipe connected to the atmosphere respectively constitute a U-shaped communication pool structure. When the height of the three-way pipe changes, the water level of the simulation device changes under the action of the pressure difference, thereby realizing the simulation of different conditions. Groundwater environment, the simulated high-arsenic groundwater flows into the simulation device through the first pipeline, and the simulated high-arsenic groundwater seeps in the simulation device under the action of gravity, and the simulated high-arsenic groundwater that has completed seepage is discharged from the simulation device, and then sequentially It flows into a monitoring pool, a tee pipe and a waste liquid pool. Several water quality monitoring probes are placed in the monitoring pool. The water quality monitoring probes are used to continuously monitor water samples, and the waste liquid pool is used to collect outflowing water samples. 2. The experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment as claimed in claim 1, wherein the simulation device comprises a simulation device main body, an upper end of the simulation device arranged above the simulation device main body, and an upper end of the simulation device arranged on the simulation device body. The lower end of the simulation device below the main body, the upper end of the simulation device is connected to the main body of the simulation device through a first flange, the upper end of the simulation device and the first flange are sealed by a first rubber sealing ring, the simulation device The lower end is connected to the main body of the simulation device through a second flange, and the lower end of the simulation device and the second flange are sealed by a second rubber ring. 3. The experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment as claimed in claim 2, wherein a first water inlet is provided at the middle position of the upper end of the simulation device, and the first water inlet is passed through the first water inlet. One end of the pipeline is connected to the upper end of the simulation device, and a two-phase valve is set on the first pipeline. When the two-phase valve is opened, the simulated high-arsenic groundwater flows into the main body of the simulation device, and the middle position of the lower end of the simulation device is opened. A water outlet, one end of the second pipeline is connected to the lower end of the simulation device through the first water outlet, a three-phase valve is arranged on the second pipeline, one end of the three-phase valve communicates with the atmosphere, the other communicates with the atmosphere One end of the three-phase valve is used for water sample collection. 4. The experimental device for simulating the impact of high-arsenic groundwater irrigation on groundwater environment as claimed in claim 2, wherein the side of the main body of the simulation device close to the upper end of the simulation device is provided with a first small hole, and the first small hole is A vent valve is installed in the hole, and the vent valve is used to realize the gas exchange between the interior of the main body of the simulation device and the atmosphere. 5. The experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment as claimed in claim 2, wherein the side of the main body of the simulation device is provided with some small holes, and these small holes are used to realize the longitudinal flow path collection of water samples. 6. The experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment as claimed in claim 2, wherein the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all rubber pipelines, and the The three-way pipe is a glass three-way pipe. The main body of the simulation device, the upper end of the simulation device and the lower end of the simulation device are all made of transparent PVC material. The simulated soil layer is selected from any one of quartz sand or clay. The anaerobic water Add arsenic and iron reagents. 7. The experimental device for simulating the impact of high-arsenic groundwater irrigation on groundwater environment as claimed in claim 2, wherein the height of the three-way pipe is not greater than the internal water level of the main body of the simulation device, and the bottom of the main body of the simulation device A plastic mesh lining is installed, and the pore size of the plastic mesh lining is smaller than the particle size of the simulated soil layer. 8. The experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment as claimed in claim 1, wherein a pump is connected on the first pipeline, and the simulated high-arsenic groundwater is transported to the simulation device by the pump, so that A filter is installed in the first pipeline, and the filter is used to remove impurities in the simulated high-arsenic groundwater. A water distributor is provided inside the simulation device, and the water distributor is used to evenly distribute the simulated high-arsenic groundwater. 9. The experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment as claimed in claim 1, wherein the monitoring pool is provided with a second water inlet and a second water outlet, and the position of the second water inlet At a position lower than the second water outlet, the second water inlet is connected to a second pipeline, and the second water outlet is connected to a third pipeline. 10. The experimental device for simulating the impact of high-arsenic groundwater irrigation on the groundwater environment as claimed in claim 1, wherein a lifting platform is set below the tee pipe, and the lifting platform is used to fix the position of the tee pipe and Change the height of the tee.