Continuous monitoring equipment and method for characterizing natural attenuation of chlorobenzene in groundwater

Abstract

The application discloses a continuous monitoring equipment and method for characterizing natural attenuation law of chlorobenzene in groundwater, and the equipment comprises a main monitoring well located at a pollution source position and a plurality of auxiliary monitoring wells located in a downstream direction of the pollution source, a main monitoring head is arranged in the main monitoring well, an auxiliary monitoring head and an adsorption assembly synchronously moving with the auxiliary monitoring head are arranged in the auxiliary monitoring well. The method comprises the following steps: S1, monitoring well layout; S2, monitoring period setting; S3, self-repairing. According to the trend of chlorobenzene pollutants, the main monitoring well and the auxiliary monitoring well can be used for segmented monitoring, the distance between the main monitoring well and the auxiliary monitoring well is optimized, and therefore, the groundwater chlorobenzene pollution can be more comprehensively and accurately monitored and evaluated, the adsorption assembly arranged in the auxiliary monitoring well can be used for automatic repairing treatment according to the monitoring result, the monitoring, analysis and treatment are integrated, and the natural attenuation law of chlorobenzene in the groundwater can be conveniently analyzed.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of groundwater monitoring, in particular to a continuous monitoring device and method for characterizing the natural attenuation law of chlorobenzene in groundwater. BACKGROUND

[0002] Chlorobenzene pollutants will undergo natural attenuation when they are biodegraded and adsorbed in aquifers. Further research on the natural attenuation process of chlorobenzene pollutants is of great importance for assessing the risk of the water environment near the pollution source, and is also helpful for exploring the adsorption and desorption mechanisms of complex chlorobenzene organic compounds. However, there is still no reasonable solution for the research on the self-thermal attenuation of chlorobenzene and the corresponding countermeasures.

[0003] For example, patent CN113772804B discloses a groundwater pollution monitoring natural attenuation remediation prediction method, system and device. The system comprises a standard establishment module for establishing an MNA conceptual model of a pollution site, determining a monitoring target and MNA control standard of the pollution site; a field monitoring network for determining a monitoring position, monitoring object, monitoring index and monitoring frequency based on the conceptual model to realize field monitoring of the pollution site; and an evaluation module for evaluating the feasibility of MNA remediation technology through indoor simulation tests and field monitoring. If the MNA remediation technology is not feasible, enhanced natural attenuation is performed; if the MNA remediation technology is feasible, a final MNA effectiveness evaluation result is output. The invention patent realizes effective prediction of groundwater pollution monitoring natural attenuation remediation, the scheme is simple to implement, can realize accurate long-term prediction, and greatly reduces the time cost of evaluation. However, the invention patent is only based on theoretical research and conceptual models, and has limited help for practical application and operation. SUMMARY

[0004] In view of the above problems, the application provides a continuous monitoring device and method for characterizing the natural attenuation law of chlorobenzene in groundwater.

[0005] The technical scheme of the application is as follows:

[0006] The continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater comprises a main monitoring well located at a pollution source position and a plurality of auxiliary monitoring wells located in a downstream direction of the pollution source. The main monitoring well is internally provided with a main monitoring head, and the auxiliary monitoring wells are internally provided with auxiliary monitoring heads and adsorption assemblies that move synchronously with the auxiliary monitoring heads.

[0007] The main monitoring well is provided with a lifting motor at the top, and the output end of the lifting motor is connected with the main monitoring head.

[0008] The top of the auxiliary monitoring well is provided with a top cover, a groove is arranged in the middle of the top surface of the top cover, two driving wheels are symmetrically arranged in the groove, the driving wheels are respectively driven to rotate by two driving motors arranged above the driving wheels, a steel wire rope is clamped in the middle of the two driving wheels, the steel wire rope is driven to slide left and right when the driving wheels rotate, one end of the steel wire rope is fixedly connected to the top end of the auxiliary monitoring head, the other end of the steel wire rope penetrates through a clamping groove arranged in the bottom surface of the top cover and then extends out from the center of the bottom surface of the top cover and is fixedly connected to the top of the adsorption assembly.

[0009] The adsorption assembly comprises a main fixed rod arranged at the center of the auxiliary monitoring well and two auxiliary fixed rods arranged on both sides of the main fixed rod, a fixed plate is fixedly connected to the top of the main fixed rod, the auxiliary fixed rods are rotatably connected to the fixed plate through first spring shafts, the top of the fixed plate is connected to the steel wire rope, the bottom of the main fixed rod and the auxiliary fixed rod is jointly connected to an arc-shaped expansion plate, a plurality of supporting rods are arranged at the bottom of the arc-shaped expansion plate, and an adsorption net is arranged between the supporting rods.

[0010] Further, the distance between the main monitoring well and the nearest auxiliary monitoring well is 50-500m, and the last auxiliary monitoring well is located at the intersection of the groundwater flow direction and the downstream field boundary.

[0011] Description: By optimizing the distance between the main monitoring well and the auxiliary monitoring well, the groundwater chlorobenzene pollution can be more comprehensively and accurately monitored and evaluated.

[0012] Further, one fixed support is arranged on each of the left side, the right side and the rear side of the driving motor, and the fixed supports at the corresponding positions of the two driving motors are symmetrically arranged in pairs.

[0013] Description: By this arrangement, the driving motor can be more stable during operation.

[0014] Further, an arc-shaped groove is arranged on each of the left side and the right side of the top cover, the inner side of the arc-shaped groove extends into the auxiliary monitoring well for lowering the steel wire rope, one end of the steel wire rope is connected to the clamping groove through the arc-shaped groove, and the other end of the steel wire rope extends into the auxiliary monitoring well through the arc-shaped groove.

[0015] Description: The arc-shaped groove facilitates the lowering of the steel wire rope and also facilitates replacement.

[0016] Further, two first sliding grooves are symmetrically arranged on the inner wall of the auxiliary monitoring well on the left and right sides, a second sliding groove is arranged on the inner wall of the auxiliary monitoring well in the vertical direction of the connecting line of the two first sliding grooves, the inside of the second sliding groove is T-shaped, one end of the shell back of the auxiliary monitoring head is provided with a T-shaped sliding block, the T-shaped sliding block is in sliding and limiting clamping connection with the second sliding groove, and when the auxiliary monitoring head slides downward, the adsorption assembly rises and the auxiliary monitoring head passes through one side of the adsorption assembly. Two auxiliary fixing rods are respectively in sliding connection with two first sliding grooves.

[0017] It is specified that the setting of the first sliding groove can keep the direction of the adsorption assembly stable when the adsorption assembly slides up and down, and the setting of the second sliding groove can keep the direction of the auxiliary monitoring head stable when the auxiliary monitoring head slides up and down, and the auxiliary monitoring head will not collide with the adsorption assembly.

[0018] Further, a first telescopic inner plate is slidably sleeved on each side of the arc-shaped telescopic plate, a second telescopic inner plate is slidably sleeved on the end of each of the two first telescopic inner plates, a supporting rod is arranged below and on both sides of the bottom of the arc-shaped telescopic plate, a supporting rod is rotatably connected to the bottom of the end of each of the two first telescopic inner plates through a second spring shaft, a supporting rod is rotatably connected to the bottom of the end of each of the two second telescopic inner plates through a second spring shaft, any two adjacent supporting rods are connected through a high compression spring located at the bottom of the supporting rods, and the top of the supporting rods on both sides of the bottom of the arc-shaped telescopic plate is provided with a limiting block for sliding connection with a third sliding groove arranged on the bottom of the arc-shaped telescopic plate. When all the supporting rods are unfolded under the action of the high compression spring, the adsorption net assumes a fan shape of 160-170°.

[0019] It is specified that the setting of the first telescopic inner plate and the second telescopic inner plate can make the arc-shaped telescopic plate extend along the arc-shaped telescopic plate and cooperate with the setting of the supporting rods to complete the unfolding of the adsorption net, so that the adsorption net can change from the state of being shrunk in the auxiliary monitoring well to the state of being stretched in the groundwater at the bottom of the auxiliary monitoring well, so as to adsorb and treat the chlorobenzene pollutants in the groundwater, and the effect of intercepting the pollutants is good, the adsorption efficiency is high, and the degree of integration of the whole device is high, facilitating overall disassembly and replacement.

[0020] Further, the adsorption net is located above the high compression spring, and the inside of the adsorption net is filled with activated carbon.

[0021] It is specified that the setting of the high compression spring can realize the shrinking and unfolding of the adsorption assembly.

[0022] The continuous monitoring method of the continuous monitoring equipment for characterizing the natural attenuation law of chlorobenzene in groundwater described above comprises the following steps:

[0023] S1, monitoring well arrangement: a main monitoring well is arranged around the pollution source at a distance of 15-20 m, 3-5 auxiliary monitoring wells are arranged in sequence downstream of the main monitoring well as one group of monitoring points, and 2-3 groups of monitoring points are arranged in total;

[0024] S2, monitoring period setting: a main monitoring head is placed in a main monitoring well, a secondary monitoring head is placed in a secondary monitoring well, monitoring data of the main monitoring head and the secondary monitoring head are collected every 1-3 days, and the content of chlorobenzene pollutants in the monitored underground water is compared with the detection limit, so as to evaluate the natural attenuation law of chlorobenzene in the underground water, and a natural attenuation factor AF=K2 / K1 is obtained, wherein K1 is the content of chlorobenzene pollutants in the underground water monitored by the main monitoring head, and the unit is μg / L, and K2 is the content of chlorobenzene pollutants in the underground water monitored by the secondary monitoring head of the secondary monitoring well closest to the main monitoring well, and the unit is μg / L;

[0025] S3, self-repairing: when the content of chlorobenzene pollutants in the underground water monitored by the main monitoring head in the main monitoring well is increased by 10-15% compared with the detection limit, the factory near the pollution source is controlled to reduce the pollution source emission, and the adsorption assembly is used for self-repairing of the inside of the secondary monitoring well, the repair target concentration RT1 of the main monitoring well is C T , wherein C T is the water quality standard, the repair target concentration RT2 of the secondary monitoring well closest to the main monitoring well is RT1·AF, and the repair target concentration RT n of the nth secondary monitoring well is RT n-1 ·AF.

[0026] Further, the chlorobenzene pollutants in the underground water include benzene, 1,2-DCB, ethylbenzene, MCB and 1,4-dichlorobenzene.

[0027] Description: The chlorobenzene pollutants in the underground water targeted by the application are common factory pollutants, such as paper mill pollutants.

[0028] The application has the following beneficial effects:

[0029] (1) The continuous monitoring equipment for characterizing the natural attenuation law of chlorobenzene in the underground water can segmentally monitor according to the direction of chlorobenzene pollutants by setting the main monitoring well and the secondary monitoring well, and can more comprehensively and accurately monitor and evaluate the chlorobenzene pollution in the underground water by optimizing the distance between the main monitoring well and the secondary monitoring well, especially the adsorption assembly in the secondary monitoring well can automatically repair according to the monitoring result, so that the monitoring, analysis and processing are integrated, and researchers can better analyze the natural attenuation law of chlorobenzene in the underground water.

[0030] (2) The auxiliary monitoring well in the continuous monitoring equipment for representing the natural attenuation law of chlorobenzene in groundwater can realize the alternate lowering and lifting of the adsorption assembly and the auxiliary monitoring head, the first sliding groove is arranged to keep the direction of the adsorption assembly stable when sliding up and down, the second sliding groove is arranged to keep the direction of the auxiliary monitoring head stable when sliding up and down and prevent the auxiliary monitoring head from colliding with the adsorption assembly, and the arc-shaped groove is arranged to facilitate the lowering of the steel wire rope and replacement.

[0031] (3) The continuous monitoring equipment for representing the natural attenuation law of chlorobenzene in groundwater can realize the expansion of the adsorption net through the arrangement of the first telescopic inner plate and the second telescopic inner plate and the cooperation of the telescopic arc-shaped plate and the support rod, so that the adsorption net can change from the state of being contracted in the auxiliary monitoring well to the state of being stretched in the groundwater at the bottom of the auxiliary monitoring well, so as to adsorb and treat the chlorobenzene pollutants in the groundwater, the effect of intercepting pollutants is good, the adsorption efficiency is high, and the whole device has high integration degree and is convenient to disassemble and replace.

[0032] (4) The continuous monitoring method for representing the natural attenuation law of chlorobenzene in groundwater calculates the natural attenuation factor according to the monitoring results of the main monitoring well and the auxiliary monitoring well, and when the pollution is too high, a new pollution remediation target is calculated according to the natural attenuation factor, different auxiliary monitoring wells complete remediation according to their respective pollution remediation targets and the adsorption assembly in the equipment, realizes the integration of monitoring, analysis and treatment, and makes a contribution to the study of the natural attenuation law of chlorobenzene in groundwater. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is the main monitoring well and auxiliary monitoring well layout plane of the continuous monitoring equipment and method for representing the natural attenuation law of chlorobenzene in groundwater of the application;

[0034] Figure 2 is the main monitoring well profile of the continuous monitoring equipment for representing the natural attenuation law of chlorobenzene in groundwater of the application;

[0035] Figure 3 is the auxiliary monitoring well structure schematic view of the continuous monitoring equipment for representing the natural attenuation law of chlorobenzene in groundwater of the application;

[0036] Figure 4 is the auxiliary monitoring well profile of the continuous monitoring equipment for representing the natural attenuation law of chlorobenzene in groundwater of the application;

[0037] Figure 5 is the auxiliary monitoring well top structure schematic view on the ground of the continuous monitoring equipment for representing the natural attenuation law of chlorobenzene in groundwater of the application;

[0038] Figure 6This is a top view of the auxiliary monitoring well in the continuous monitoring equipment for characterizing the natural attenuation law of chlorobenzene in groundwater according to the present invention;

[0039] Figure 7 2. It is a schematic structural diagram of an adsorption component in a continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater according to the present invention;

[0040] Figure 8 This is a front view of an adsorption component in a continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater according to the present invention;

[0041] Figure 9 It is a side view of the top cover and the card slot of the continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater of the present invention;

[0042] Figure 10 This is a front view of the top cover and the card slot of the continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater according to the present invention;

[0043] Figure 11 This is a cross-sectional view of the interior of an auxiliary monitoring well in the continuous monitoring equipment for characterizing the natural attenuation law of chlorobenzene in groundwater according to the present invention.

[0044] Among them, 1-main monitoring well, 11-main monitoring head, 12-lifting motor, 2-auxiliary monitoring well, 21-auxiliary monitoring head, 22-top cover, 23-groove, 24-card slot, 25-arc groove, 26-first slide, 27-second slide, 28-T-type slider, 3-adsorption assembly, 31-main fixed rod, 32-auxiliary fixed rod, 33-fixed plate, 34-first spring shaft, 35-arc-shaped telescopic plate, 351-first telescopic inner plate, 352-second telescopic inner plate, 353-third slide, 36-support rod, 361-second spring shaft, 362-limit block, 37-adsorption net, 38-high compression spring, 4-driving wheel, 41-driving motor, 42-wire rope, 43-fixed bracket. DETAILED DESCRIPTION Example 1

[0045] like Figures 1-3 As shown, the continuous monitoring equipment for characterizing the natural attenuation law of chlorobenzene in groundwater includes a main monitoring well 1 located at the pollution source, and four auxiliary monitoring wells 2 located downstream of the pollution source. The main monitoring well 1 is provided with a main monitoring head 11, and the auxiliary monitoring wells 2 are provided with auxiliary monitoring heads 21 and an adsorption component 3 that moves synchronously with the auxiliary monitoring heads 21. The distance between the main monitoring well 1 and the nearest auxiliary monitoring well 2 is 300m. The last auxiliary monitoring well 2 is located at the intersection of the groundwater flow direction and the downstream field boundary.

[0046] like Figure 2As shown, the top of the main monitoring well 1 is provided with a lifting motor 12, and the output end of the lifting motor 12 is connected with the main monitoring head 11.

[0047] As shown in Figures 3-6 , 9, 10, the top of the auxiliary monitoring well 2 is provided with a top cover 22, and the top surface of the top cover 22 is provided with a groove 23 in the middle, and two drive wheels 4 are symmetrically arranged inside the groove 23, and the drive wheels 4 are respectively driven to rotate by two drive motors 41 located above them, and the drive wheels 4 clench a steel wire rope 42 in the middle, and the drive wheels 4 drive the steel wire rope 42 to slide left and right when rotating, one end of the steel wire rope 42 is fixedly connected with the top end of the auxiliary monitoring head 21, and the other end of the steel wire rope 42 extends out from the center of the bottom surface of the top cover 22 after penetrating through a clamping groove 24 provided on the bottom surface of the top cover 22 and is fixedly connected with the top of the adsorption assembly 3, and one fixed support 43 is arranged on each of the left and right sides and the rear side of the drive motor 41, and the fixed supports 43 at the corresponding positions of the two drive motors 41 are symmetrically arranged in pairs, and one arc-shaped groove 25 is arranged on each of the left and right sides of the top cover 22, and the inner side of the arc-shaped groove 25 extends into the auxiliary monitoring well 2 for lowering the steel wire rope 42, and one end of the steel wire rope 42 is connected with the clamping groove 24 through the arc-shaped groove 25, and the other end of the steel wire rope 42 extends into the auxiliary monitoring well 2 through the arc-shaped groove 25;

[0048] As shown in Figure 3 , 7 , 8, the adsorption assembly 3 includes a main fixed rod 31 located at the center of the auxiliary monitoring well 2, and two auxiliary fixed rods 32 located on both sides of the main fixed rod 31, and a fixed plate 33 is fixedly connected to the top of the main fixed rod 31, and the auxiliary fixed rods 32 are rotatably connected with the fixed plate 33 through a first spring shaft 34, and the fixed plate 33 is connected with the steel wire rope 42 at the top, and the main fixed rod 31 and the auxiliary fixed rod 32 are jointly provided with an arc-shaped expansion plate 35 at the bottom, and the arc-shaped expansion plate 35 is provided with five supporting rods 36 at the bottom, and an adsorption net 37 is arranged between each supporting rod 36;

[0049] As shown in Figure 7 , 8As shown in FIGS. 11, two first sliding grooves 26 are symmetrically arranged on the left and right inner walls of the auxiliary monitoring well 2, a second sliding groove 27 is arranged on the inner wall of the auxiliary monitoring well 2 in the direction perpendicular to the line connecting the two first sliding grooves 26, the second sliding groove 27 is T-shaped in the inside, a T-shaped sliding block 28 is arranged at one end of the back of the shell of the auxiliary monitoring head 21, the T-shaped sliding block 28 is slidingly and limitingly connected with the second sliding groove 27, when the auxiliary monitoring head 21 slides downward, the adsorption assembly 3 rises and the auxiliary monitoring head 21 passes through one side of the adsorption assembly 3, two auxiliary fixing rods 32 are slidingly connected with the two first sliding grooves 26 respectively, an arc-shaped extension plate 35 is slidingly sleeved with a first extension inner plate 351 on each side, a second extension inner plate 352 is slidingly sleeved with the first extension inner plate 351 at the end, a support rod 36 is arranged below and on each side of the bottom of the arc-shaped extension plate 35, the support rod 36 is rotatably connected with the second spring shaft 361 at the bottom of the end of the first extension inner plate 351, the support rod 36 is rotatably connected with the second spring shaft 361 at the bottom of the end of the second extension inner plate 352, any two adjacent support rods 36 are connected through the high compression spring 38 arranged at the bottom, the top of the support rod 36 on each side of the bottom of the arc-shaped extension plate 35 is provided with a limiting block 362 for slidingly connecting with the third sliding groove 353 arranged on the bottom of the arc-shaped extension plate 35, when all the support rods 36 are unfolded under the action of the high compression spring 38, the adsorption net 37 is in the shape of a 160° sector, the adsorption net 37 is above the high compression spring 38, and the inside of the adsorption net 37 is filled with activated carbon. Example 2

[0050] The difference between this embodiment and example 1 is that the number and position of the auxiliary monitoring wells 2 are different.

[0051] The three auxiliary monitoring wells 2 are located in the downstream direction of the pollution source, and the distance between the main monitoring well 1 and the nearest auxiliary monitoring well 2 is 50 m. Example 3

[0052] The difference between this embodiment and example 1 is that the number and position of the auxiliary monitoring wells 2 are different.

[0053] The six auxiliary monitoring wells 2 are located in the downstream direction of the pollution source, and the distance between the main monitoring well 1 and the nearest auxiliary monitoring well 2 is 500 m. Example 4

[0054] The difference between this embodiment and example 1 is that the unfolding angle of the support rod is different.

[0055] When all the support rods 36 are unfolded under the action of the high compression spring 38, the adsorption net 37 is in the shape of a 170° sector.

[0056] Working principle: The working principle of the continuous monitoring equipment for characterizing the natural attenuation rule of chlorobenzene in groundwater is further described below.

[0057] In use, if the groundwater in the auxiliary monitoring well 2 is to be repaired by the adsorption assembly 3, the two drive motors 41 are turned on to drive the steel wire rope 42 to move clamped between the two drive wheels 4. One end of the steel wire rope 42 drives the auxiliary monitoring head 21 to rise, so that it is away from the monitored groundwater. The T-shaped sliding block 28 slides in the second sliding groove 27 to keep the auxiliary monitoring head 21 stable during the rising process. The other end of the steel wire rope 42 drives the adsorption assembly 3 to lower. The steel wire rope 42 passes through the clamping groove 24 to keep the adsorption assembly 3 always located at the center of the auxiliary monitoring well 2. During the lowering process of the steel wire rope 42, the two auxiliary fixing rods 32 slide along the two first sliding grooves 26, respectively, until each supporting rod 36 is lowered into the groundwater and is out of the range of the bottom of the auxiliary monitoring well 2. At this time, each supporting rod 36 is expanded under the action of the high compression spring 38. The limiting block 362 slides in the third sliding groove 353. The first telescopic inner plate 351 extends along the inside of the arc-shaped telescopic plate 35. The second telescopic inner plate 352 extends along the inside of the first telescopic inner plate 251. The second spring shaft 361 of each supporting rod 36 rotates to offset the distance turned by the supporting rod 36. The first spring shaft 34 of the auxiliary fixing rod 32 rotates to offset the distance turned by the auxiliary fixing rod 32, so that the adsorption net 37 on each supporting rod 36 is unfolded, the adsorption repair area is expanded, an adsorption repair layer that blocks the flow of groundwater is formed, and the pollutants in the flowing groundwater are continuously adsorbed and repaired by the activated carbon on the adsorption net 37.

[0058] After the repair is completed, the adsorption assembly 3 is lifted in the same way as described above, and the auxiliary monitoring head 2 is lowered into the groundwater to continue monitoring. After a large number of repeated repairs, the adsorption assembly 3 is removed and replaced as a whole. Example 5

[0059] This embodiment is a continuous monitoring method of the continuous monitoring equipment for characterizing the natural attenuation law of chlorobenzene in groundwater in Example 1, comprising the following steps:

[0060] S1, monitoring well layout: a main monitoring well 1 is laid around a pollution source within a radius of 17 m. Four auxiliary monitoring wells 2 are laid in the downstream direction of the main monitoring well 1 in sequence as a group of monitoring points. A total of two groups of monitoring points are laid. The chlorobenzene pollutants in the groundwater include benzene, 1,2-DCB, ethylbenzene, MCB, and 1,4-dichlorobenzene.

[0061] S2. Monitoring cycle setting: Place a main monitoring head 11 inside the main monitoring well 1 and an auxiliary monitoring head 21 inside the auxiliary monitoring well 2. Collect monitoring data from the main monitoring head 11 and the auxiliary monitoring head 21 every two days, and compare the monitored chlorobenzene pollutant content in the groundwater with the detection limit to evaluate the natural attenuation law of chlorobenzene in the groundwater. Calculate the natural attenuation factor AF = K2 / K1, where K1 is the chlorobenzene pollutant content in the groundwater monitored by the main monitoring head 11, in μg / L, and K2 is the chlorobenzene pollutant content in the groundwater monitored by the auxiliary monitoring head 21 in the auxiliary monitoring well 2 closest to the main monitoring well 1, in μg / L.

[0062] S3. Self-repair: When the chlorobenzene pollutant content in the groundwater detected by the main monitoring head 11 inside the main monitoring well 1 increases by 12% compared with the detection limit, the factories near the pollution source are controlled to reduce the pollution source emissions. The method detection limit of the pollutants is 0.5μg / L. At the same time, the adsorption component 3 is used to self-repair the auxiliary monitoring well 2. The repair target concentration RT1 of the main monitoring well 1 is C T , where C T The water quality standard is RT2, the remediation target concentration of the auxiliary monitoring well 2 closest to the main monitoring well 1 is RT1·AF, and so on. The remediation target concentration RT2 of the nth auxiliary monitoring well 2 is n =RT n-1 ·AF. Example 6

[0063] The difference between this embodiment and embodiment 5 is that the specific parameter settings are different.

[0064] S1. Monitoring well layout: Figure 1 As shown, a main monitoring well 1 is arranged at a radius of 15m around the pollution source, and three auxiliary monitoring wells 2 are arranged in sequence in the downstream direction of the main monitoring well 1 as a group of monitoring points. A total of two groups of monitoring points are arranged. Chlorobenzene pollutants in groundwater include benzene, 1,2-DCB, ethylbenzene, MCB, and 1,4-dichlorobenzene.

[0065] S2. Monitoring cycle setting: Place the main monitoring head 11 in the main monitoring well 1 and the auxiliary monitoring head 21 in the auxiliary monitoring well 2. Collect monitoring data from the main monitoring head 11 and the auxiliary monitoring head 21 every other day, and compare the monitored chlorobenzene pollutant content in the groundwater with the detection limit;

[0066] S3. Self-repair: When the content of chlorobenzene pollutants in the groundwater monitored by the main monitoring head 11 inside the main monitoring well 1 increases by 10% compared with the detection limit, the factories near the pollution source will be controlled to reduce pollution source emissions. The method detection limit of the pollutants is 0.5μg / L. Example 7

[0067] The embodiment differs from embodiment 5 in that the specific parameter settings are different.

[0068] S1, monitoring well layout: a main monitoring well 1 is laid around the pollution source within a square of 20 m, five auxiliary monitoring wells 2 are laid in the downstream direction of the main monitoring well 1, serving as one group of monitoring points, a total of three groups of monitoring points, and the chlorobenzene pollutants in the groundwater include benzene, 1,2-DCB, ethylbenzene, MCB, and 1,4-dichlorobenzene;

[0069] S2, monitoring period setting: a main monitoring head 11 is placed inside the main monitoring well 1, and an auxiliary monitoring head 21 is placed inside the auxiliary monitoring well 2, the monitoring data of the main monitoring head 11 and the auxiliary monitoring head 21 are collected every 3 days, and the content of the chlorobenzene pollutants in the monitored groundwater is compared with the detection limit;

[0070] S3, self-repair: when the content of the chlorobenzene pollutants in the groundwater monitored by the main monitoring head 11 inside the main monitoring well 1 increases by 15% compared with the detection limit, the factory near the pollution source is controlled to reduce the pollution source emission, and the method detection limit of the pollutants is 0.5 μg / L.

[0071] Experimental example

[0072] The actual groundwater environment is monitored and repaired by the method in embodiment 6 combined with the equipment in embodiment 1, after 15 times of monitoring, K1 is the content of the chlorobenzene pollutants in the groundwater monitored by the main monitoring head 11, the average value is 0.27 μg / L, K2 is the content of the chlorobenzene pollutants in the groundwater monitored by the auxiliary monitoring head 21 of the auxiliary monitoring well 2 closest to the main monitoring well 1, the average value is 0.21 μg / L, the natural attenuation factor AF = K2 / K1 = 0.778 is obtained, then after the pollution source emits pollutants, the content of the chlorobenzene pollutants in the groundwater inside the main monitoring well 1 is monitored to be 1.25 mg / L, which is far beyond the detection limit, therefore the repair needs to be carried out through the adsorption assembly 3 of each auxiliary monitoring well 2, the repair target concentration RT1 of the main monitoring well 1 is C T =0.5 μg / L, the repair target concentration RT2 of the auxiliary monitoring well 2 closest to the main monitoring well 1 is RT1·AF = 0.389 μg / L, and so on, the repair target concentration RT n of the nth auxiliary monitoring well 2 is RT n-1 ·AF.

[0073] Meanwhile, the adsorption effect of the adsorption net is tested, and it is found that the adsorption amount of chlorobenzene pollutants of the adsorption net is 35 mg / g of activated carbon, and the adsorption amount of chlorobenzene pollutants of the conventional repair method of putting activated carbon is 30 mg / g of activated carbon, so that the continuous monitoring equipment for characterizing the natural attenuation law of chlorobenzene in groundwater is combined with the method, and better repair effect can be achieved.

Claims

1. A continuous monitoring device for characterizing the natural attenuation of chlorobenzene in groundwater, characterized in that: The invention comprises a main monitoring well (1) located at the pollution source, and a plurality of auxiliary monitoring wells (2) located in the downstream direction of the pollution source, wherein a main monitoring head (11) is provided inside the main monitoring well (1), and auxiliary monitoring heads (21) and adsorption components (3) that move synchronously with the auxiliary monitoring heads (21) are provided inside the auxiliary monitoring wells (2); A lifting motor (12) is provided at the top of the main monitoring well (1), and an output end of the lifting motor (12) is connected to the main monitoring head (11); The auxiliary monitoring well (2) is provided with a top cover (22) at the top, a groove (23) is provided in the middle of the top surface of the top cover (22), two driving wheels (4) are symmetrically provided inside the groove (23), the driving wheels (4) are driven to rotate respectively by two driving motors (41) located above them, a steel wire rope (42) is clamped in the middle of the two driving wheels (4), and the steel wire rope (42) is driven to slide left and right when the driving wheels (4) rotate, one end of the steel wire rope (42) is fixedly connected to the top of the auxiliary monitoring head (21), and the other end of the steel wire rope (42) passes through the slot (24) provided on the bottom surface of the top cover (22), and then extends from the center of the bottom surface of the top cover (22) and is fixedly connected to the top of the adsorption component (3); The adsorption assembly (3) comprises a main fixed rod (31) located at the center of the auxiliary monitoring well (2), and two auxiliary fixed rods (32) located on both sides of the main fixed rod (31), a fixed plate (33) is fixedly connected to the top of the main fixed rod (31), the auxiliary fixed rod (32) and the fixed plate (33) are rotatably connected via a first spring shaft (34), the top of the fixed plate (33) is connected to the steel wire rope (42), the bottoms of the main fixed rod (31) and the auxiliary fixed rod (32) are commonly connected to an arc-shaped telescopic plate (35), the bottom of the arc-shaped telescopic plate (35) is provided with a plurality of support rods (36), and an adsorption net (37) is provided between each of the support rods (36).

2. The continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater according to claim 1, characterized in that: The distance between the main monitoring well (1) and the nearest auxiliary monitoring well (2) is 50-500 m, and the last auxiliary monitoring well (2) is located at the intersection of the groundwater flow direction and the downstream field boundary.

3. The continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater according to claim 1, characterized in that: A fixing bracket (43) is provided on each side and rear side of the driving motor (41), and the fixing brackets (43) at corresponding positions of the two driving motors (41) are symmetrically arranged in pairs.

4. The continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater according to claim 1, characterized in that: An arc-shaped groove (25) is provided on each of the left and right sides of the top cover (22). The inner side of the arc-shaped groove (25) extends into the auxiliary monitoring well (2) for lowering the steel wire rope (42). One end of the steel wire rope (42) is connected to the clamping groove (24) through the arc-shaped groove (25), and the other end of the steel wire rope (42) extends into the interior of the auxiliary monitoring well (2) through the arc-shaped groove (25).

5. The continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater according to claim 1, characterized in that: Two first chutes (26) are symmetrically provided on the left and right sides of the inner wall of the auxiliary monitoring well (2), and a second chute (27) is provided on the inner wall of the auxiliary monitoring well (2) in a direction perpendicular to the line connecting the two first chutes (26). The interior of the second chute (27) is T-shaped. A T-shaped slider (28) is provided at one end of the back side of the shell of the auxiliary monitoring head (21). The T-shaped slider (28) slides and is limitedly engaged with the second chute (27). When the auxiliary monitoring head (21) slides down, the adsorption component (3) rises and the auxiliary monitoring head (21) passes through one side of the adsorption component (3). The two auxiliary fixing rods (32) are respectively slidably connected with the two first chutes (26).

6. The continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater according to claim 1, characterized in that: A first telescopic inner plate (351) is slidably sleeved on each of the two sides of the arc-shaped telescopic plate (35), and a second telescopic inner plate (352) is slidably sleeved on each of the ends of the two first telescopic inner plates (351). A support rod (36) is provided just below and on both sides of the bottom of the arc-shaped telescopic plate (35). The bottoms of the ends of the two first telescopic inner plates (351) are rotatably connected to a support rod (36) via a second spring shaft (361), and the bottoms of the ends of the two second telescopic inner plates (352) are rotatably connected to a support rod (36) via a second spring shaft (361). Any two adjacent support rods (36) are connected via a high compression spring (38) located at their bottoms. The tops of the support rods (36) on both sides of the bottom of the arc-shaped telescopic plate (35) are provided with limit blocks (362) for slidably connecting to the third sliding groove (353) provided at the bottom of the arc-shaped telescopic plate (35). When all the support rods (36) are unfolded under the action of the high compression spring (38), the adsorption net (37) presents a fan shape of 160-170 degrees.

7. The continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater according to claim 6, characterized in that: The adsorption net (37) is located above the high compression spring (38), and the interior of the adsorption net (37) is filled with activated carbon.

8. The continuous monitoring method of any one of claims 1 to 7, wherein the continuous monitoring device for characterizing the natural attenuation law of chlorobenzene in groundwater is characterized in that: The following steps are involved: S1. Monitoring well layout: A main monitoring well (1) is laid out at a radius of 15 to 20 meters around the pollution source, and 3 to 5 auxiliary monitoring wells (2) are laid out in sequence in the downstream direction of the main monitoring well (1) as one group of monitoring points, with a total of 2 to 3 groups of monitoring points laid out; S2. Monitoring cycle setting: a main monitoring head (11) is placed inside the main monitoring well (1), and an auxiliary monitoring head (21) is placed inside the auxiliary monitoring well (2). The monitoring data of the main monitoring head (11) and the auxiliary monitoring head (21) are collected every 1 to 3 days, and the content of chlorobenzene pollutants in the monitored groundwater is compared with the detection limit to evaluate the natural attenuation law of chlorobenzene in the groundwater, and the natural attenuation factor AF=K2 / K1 is obtained, where K1 is the content of chlorobenzene pollutants in the groundwater monitored by the main monitoring head (11), in μg / L, and K2 is the content of chlorobenzene pollutants in the groundwater monitored by the auxiliary monitoring head (21) of the auxiliary monitoring well (2) closest to the main monitoring well (1), in μg / L; S3. Self-repair: When the content of chlorobenzene pollutants in the groundwater detected by the main monitoring head (11) inside the main monitoring well (1) increases by 10~15% compared with the detection limit, the factories near the pollution source are controlled to reduce the pollution source emissions. At the same time, the adsorption component (3) is used to self-repair the auxiliary monitoring well (2). The repair target concentration RT1 of the main monitoring well (1) is C T , the unit is μg / L, where C T is the water quality standard, in μg / L. The remediation target concentration RT2 of the auxiliary monitoring well (2) closest to the main monitoring well (1) is RT1·AF, in μg / L. Similarly, the remediation target concentration RT of the nth auxiliary monitoring well (2) is n =RT n-1 AF, RT n , RT n-1 The unit is μg / L.

9. The continuous monitoring method for characterizing the natural attenuation law of chlorobenzene in groundwater according to claim 8, characterized in that: The chlorobenzene pollutants in the groundwater include benzene, 1,2-DCB, ethylbenzene, MCB, and 1,4-dichlorobenzene.

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