CN113843267A - Groundwater remediation system and remediation method for polluted site - Google Patents
Groundwater remediation system and remediation method for polluted site Download PDFInfo
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- 239000003673 groundwater Substances 0.000 title claims abstract description 147
- 238000005067 remediation Methods 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 283
- 238000012544 monitoring process Methods 0.000 claims abstract description 142
- 238000005086 pumping Methods 0.000 claims abstract description 60
- 239000000523 sample Substances 0.000 claims abstract description 25
- 230000000694 effects Effects 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims description 48
- 238000002347 injection Methods 0.000 claims description 33
- 239000007924 injection Substances 0.000 claims description 33
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- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 230000008439 repair process Effects 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 12
- 239000000356 contaminant Substances 0.000 claims description 7
- 239000003403 water pollutant Substances 0.000 claims description 4
- 239000003344 environmental pollutant Substances 0.000 description 24
- 231100000719 pollutant Toxicity 0.000 description 24
- 239000007800 oxidant agent Substances 0.000 description 17
- 238000005070 sampling Methods 0.000 description 13
- 238000012937 correction Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 4
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- 230000033228 biological regulation Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006101 laboratory sample Substances 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
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- B09C1/00—Reclamation of contaminated soil
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Abstract
The invention discloses a groundwater remediation system and a remediation method for a polluted site, wherein the groundwater remediation system comprises a groundwater monitoring well group, a groundwater pumping well group, a groundwater remediation well group, a water quality analysis center and a data processing center; monitoring wells in the underground water monitoring well group are connected with a pumping main pipe through pumping branch pipes, comprehensive water quality monitoring probes are arranged in the monitoring wells, and atmospheric pressure monitoring probes are arranged on the ground outside the monitoring wells; the water quality analysis center receives a water quality monitoring signal of the comprehensive water quality monitoring probe, analyzes the water quality monitoring signal and sends an analysis result to the data processing center; and the data processing center carries out advanced treatment on the water quality monitoring signals and outputs results to the underground water pumping well group and the underground water repairing well group. The groundwater remediation system and the remediation method for the polluted site are reasonable in arrangement, can monitor on line and feed back in real time, adjust the remediation parameters, and effectively guarantee the remediation effect.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and relates to a groundwater remediation system and a remediation method for a polluted site.
Background
In the existing groundwater remediation project of a polluted site, a groundwater monitoring system usually monitors only water level, and does not monitor other parameters and characteristic pollutants in groundwater; the adjustment basis of the process parameters of the groundwater remediation system is all groundwater monitoring indexes, and the index data is based on laboratory sample detection results. That is, the groundwater online monitoring system and the groundwater remediation system are two separate systems, and the groundwater online monitoring parameters cannot provide a basis for adjusting the process parameters of the groundwater remediation system.
The adjustment of the groundwater remediation process parameters needs to be based on groundwater detection indexes, but the groundwater in the polluted site is detected by adopting a traditional sampling-submission mode at present. The work flow of the method is complex, the time is more than 5-7 days from field sampling to report issuing in the whole process, the data timeliness is poor, the adjustment of the underground water restoration construction process parameters is seriously influenced, and the control of the restoration effect, the engineering period, the expense cost and the like of the project is not facilitated.
Patent CN113029676A discloses a fault bed rock groundwater environmental protection monitoring devices and monitoring system belongs to ecological environment protection technical field. An environmental protection monitoring device for fault bedrock groundwater comprises a sampling well, wherein an anti-theft well cover is arranged above the sampling well and used for protecting water quality of a sampling point; the sampling pipe is arranged in the sampling well and extends to underground water with a multi-layer depth; a switching assembly disposed within the sample well; the sampling assembly is arranged on the switching assembly, wherein the sampling assembly is provided with a sampling cylinder and is used for extracting water samples from a plurality of groups of sampling pipes; and the sample storage assembly is arranged in the sampling well and used for collecting, detecting and storing the water sample collected by the sampling cylinder. The patent also has the sampling and submission modes and also has the problem of data timeliness.
Therefore, it is necessary to design a groundwater remediation system and a remediation method for a polluted site to solve the existing technical problems.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a groundwater remediation system and a groundwater remediation method for a polluted site, which are reasonable in arrangement, can monitor conventional parameters of groundwater and characteristic pollutant parameters of groundwater on line, feed back the monitoring result to the remediation system in real time, and adjust process parameters in time by the remediation system according to the online monitoring result.
In order to solve the technical problems, the invention provides a groundwater remediation system for a polluted site, which comprises a groundwater monitoring well group, a groundwater pumping well group, a groundwater remediation well group, a water quality analysis center and a data processing center, wherein the groundwater monitoring well group comprises a groundwater monitoring well group, a groundwater pumping well group, a groundwater remediation well group, a water quality analysis center and a data processing center; monitoring wells in the underground water monitoring well group are connected with a pumping main pipe through pumping branch pipes, comprehensive water quality monitoring probes are arranged in the monitoring wells, and atmospheric pressure monitoring probes are arranged on the ground outside the monitoring wells; the water quality analysis center receives a water quality monitoring signal of the comprehensive water quality monitoring probe, analyzes the water quality monitoring signal and sends an analysis result to the data processing center; the data processing center carries out advanced processing on the water quality monitoring signals and outputs results to the underground water pumping well group and the underground water repairing well group; the output result of the data processing center comprises underground water online monitoring information, early warning information and process parameter adjusting information, underground water repairing process parameters are matched and adjusted in a targeted mode according to the actual situation of a polluted site repairing project, and underground water online monitoring data are converted into independent process parameters of each device and facility in the underground water repairing system.
As a preferred embodiment, the integrated water quality monitoring probe measures water level, temperature, pH, ORP, conductivity, turbidity, DO and water quality monitoring signals of the pollutant site characteristic pollutant concentration on line, and the water quality monitoring signals are represented by electric signals.
In a preferred embodiment, the water quality analysis center analyzes all electric signals of the integrated water quality monitoring probe through a water quality analysis device.
As a preferred embodiment, the underground water remediation well group comprises an aeration or injection main arranged on the pollutant ground, and an aeration or injection branch pipe is arranged at the underground water remediation well, and the aeration or injection branch pipe extends into the underground water remediation well and is positioned below the water surface of the underground water and close to the bottom of the well; the aeration or injection branch pipe can aerate the underground water in the repair well or inject a repair agent.
As a preferred embodiment, the groundwater remediation system further comprises a groundwater remediation complete equipment facility which is centrally arranged on the ground of the contaminated site; the underground water repairing matched equipment comprises a water suction pump, an injection pump, an aeration pump, repairing agent configuration equipment and underground water treatment equipment.
In addition, the invention also discloses a groundwater remediation method of a polluted site, which uses the groundwater remediation system and comprises the following steps:
s1, acquiring a water quality monitoring signal by the underground water monitoring well group and transmitting the water quality monitoring signal to a water quality analysis center, and analyzing the water quality monitoring signal into water quality monitoring data by the water quality analysis center;
s2, the water quality analysis center uploads the water quality monitoring data to the data processing center, and the data processing center receives all the operation parameters of the underground water pumping well group, the underground water repairing well group and the underground water repairing matching equipment facility;
s3, the data processing center carries out advanced processing on the water quality monitoring data, and adjusts the parameters of the repair process by combining the operation parameters of each equipment facility;
and S4, carrying out remediation process adjustment on the groundwater pumping well group, the groundwater remediation well group and the groundwater remediation supporting equipment according to the adjusted remediation process parameters sent by the data processing center, carrying out groundwater remediation work, and feeding back groundwater remediation effects through online monitoring data of the groundwater of the polluted site by the groundwater monitoring well group.
As a preferred embodiment, the data processing center integrates the electric signals of all facilities and equipment, and performs classification processing on the water quality monitoring data; the water quality monitoring data comprises water level, conventional water quality parameters and underground water pollutant parameters.
As a preferred embodiment, the water level is not influenced by conventional water quality parameters and underground water pollutant parameters, and data obtained by monitoring can be directly used as the basis for process adjustment.
As a preferred embodiment, the conventional water quality parameters are influenced by the atmospheric pressure and the temperature, the change amplitude of the conventional water quality parameters needs to be corrected by using the atmospheric pressure and temperature data, and the influence of the atmospheric pressure and the temperature on the conventional water quality parameters is eliminated; and analyzing the main influence factors of the conventional water quality parameters, and correlating the conventional water quality parameters and the main influence factors to form a mathematical relationship, wherein the mathematical relationship is used as the basis for process adjustment.
As a preferred embodiment, the groundwater contaminant parameters can influence the conventional water quality parameters, and the data obtained by monitoring can be directly used as the basis for process adjustment.
The invention has the beneficial effects that:
the underground water repairing system and the repairing method for the polluted site, which are provided by the invention, are reasonable in arrangement, can monitor the conventional parameters of underground water and the characteristic pollutant parameters in the underground water on line, feed back the monitoring result to the repairing system in real time, and carry out deep correction treatment and timely process parameter adjustment by the repairing system according to the on-line monitoring result.
Drawings
The above advantages of the present invention will become more apparent and more readily appreciated from the detailed description set forth below when taken in conjunction with the drawings, which are intended to be illustrative, not limiting, of the invention and in which:
FIG. 1 is a schematic structural diagram of a groundwater remediation system and remediation method for a contaminated site according to the present invention;
FIG. 2 is a flow chart of a groundwater remediation method for a contaminated site according to the present invention;
FIG. 3 is a diagram showing the water quality index of sewage when a polluted site is not repaired;
FIG. 4 is a diagram showing groundwater quality index at a certain time in the process of repairing a polluted site by the repairing method of the present invention;
in the drawings, the reference numerals denote the following components:
1. an underground water monitoring well; 2. an underground water pumping well; 3. a groundwater remediation well; 4. a water quality analysis center; 5. a data processing center; 6. repairing the medicament deployment device; 7. an underground water treatment facility; 8. a water injection pump; 9. an aeration pump; 10. a water pump; 11. a valve; 12. branch pipes of the pumping pipe network; 13. a pumping pipe network main pipe; 14. repairing pipe network branch pipes; 15. repairing a main pipe of the pipe network; 16. a digital signal line; 17. repairing an area of groundwater in a polluted site; 18. and (5) setting matched equipment for groundwater remediation.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts.
The schematic diagram of a groundwater remediation system of a polluted site is shown in fig. 1, and comprises a groundwater monitoring well group, a groundwater pumping well group, a groundwater remediation well group, a water quality analysis center and a data processing center; monitoring wells in the underground water monitoring well group are connected with a pumping main pipe through pumping branch pipes, comprehensive water quality monitoring probes are arranged in the monitoring wells, and atmospheric pressure monitoring probes are arranged on the ground outside the monitoring wells; and the water quality analysis center receives the water quality monitoring signals of the comprehensive water quality monitoring probe, analyzes the water quality monitoring signals and sends the analysis result to the data processing center.
In the embodiment shown in fig. 1, the contaminated site is divided into two areas: a contaminated site groundwater remediation zone 17 and other zones except the contaminated site groundwater remediation zone.
Arranging an underground water monitoring well, an underground water pumping well, an underground water repairing well, an underground water pumping pipe network, an underground water repairing pipe network and pipe network accessories (valves, flow meters and the like) in an underground water repairing area 17 of a polluted site; and a water quality analysis center 4, a data processing center 5 and a groundwater remediation supporting equipment facility 18 are arranged outside the groundwater remediation area of the polluted site.
The underground water monitoring well group comprises one or more underground water monitoring wells 1 in a pollution site and a matched underground water pumping pipe network, and the arrangement positions of the underground water monitoring wells 1 are implemented according to related national regulations.
Each underground water monitoring well 1 is connected with a pumping pipe network main pipe 13 through pumping pipe network branch pipes 12, and valves are arranged at each branch pipe. The valves are electric control valves, receive the electric signals of the data processing center 5, can control the flow of the pipeline, and are arranged on the ground of each water pumping branch pipe.
In order to monitor the pollution condition of underground water, a comprehensive water quality monitoring probe is arranged in the underground water monitoring well 1, the comprehensive water quality monitoring probe can measure water quality monitoring signals such as water level, temperature, pH, ORP (oxidation reduction potential), conductivity, turbidity, DO (dissolved oxygen), pollution site characteristic pollutant concentration and the like on line, and the water quality monitoring signals are expressed by using electric signals. In a preferred embodiment, the water quality analysis center analyzes all electric signals of the integrated water quality monitoring probe through a water quality analysis device.
An atmospheric pressure monitoring probe is arranged on the ground outside the monitoring well, so that real-time online monitoring of atmospheric pressure is realized. The underground water monitoring well group can share one atmospheric pressure monitoring probe, and a plurality of atmospheric pressure monitoring probes can also be arranged.
The data processing center carries out advanced processing on the water quality monitoring signals and outputs results to the underground water pumping well group and the underground water repairing well group; the output result of the data processing center comprises underground water online monitoring information, early warning information and process parameter adjusting information, underground water repairing process parameters are matched and adjusted in a targeted mode according to the actual situation of a polluted site repairing project, and underground water online monitoring data are converted into independent process parameters of each device and facility in the underground water repairing system.
And the data processing center performs advanced processing on the water quality monitoring data and outputs a result. The results output by the data processing center are of three types:
(1) and (5) underground water online monitoring information. The output result is a real-time detection result of the groundwater quality of the polluted site, and the information is pushed to a user by the data processing center.
(2) And (5) early warning information. When the water quality online monitoring result shows that the pollutants in the underground water exceed the standard or the pollutants possibly exceed the standard, a data processing center sends an early warning signal to a user;
(3) process parameter adjustment information. And after the data processing center carries out advanced treatment on the water quality monitoring data, the data processing center outputs process parameter adjustment information and automatically sends the electric signals to the underground water pumping well, the underground water repairing well and the underground water repairing matched equipment facility. The deep data processing is a method for adjusting independent process parameters of each device and facility in the groundwater remediation system by pertinently matching and adjusting groundwater remediation process parameters according to the actual conditions of a remediation project of a polluted site, including the conditions of each device and facility, the process parameter conditions being executed by the remediation system, site geological conditions, site pollution conditions, weather conditions and the like, and converting online groundwater monitoring data into the groundwater remediation system.
In the embodiment shown in fig. 1, the groundwater pumping well group comprises one or more groundwater pumping wells 2 in the polluted site and a matched groundwater pumping pipe network, and the arrangement positions of the pumping wells are implemented according to the relevant national regulations.
In order to achieve the underground water pumping function, the pumping pipe network branch pipes 12 are arranged in the underground water pumping well, and the pumping pipe network branch pipes 12 are respectively converged into the pumping pipe network main pipe 13 on the ground. The pumping pipe network branch pipes 12 and the pumping pipe network main pipe 13 jointly form a pumping pipe network. The underground water pumping pipe network also comprises valves which are electric control valves, receive electric signals of the data processing center, can control the flow of the pipeline and are arranged on the ground of each pumping branch pipe.
Furthermore, the groundwater monitoring and repairing group comprises one or more groundwater repairing wells 3 in the polluted site and matched groundwater repairing pipe networks, and the arrangement positions of the repairing wells are executed according to related national regulations.
In order to realize the groundwater remediation function, the groundwater remediation well has an aeration or injection function. The aeration or injection function is realized by communicating with a groundwater remediation pipe network.
The ground of the underground water remediation system is provided with an aeration or injection main pipe, and an aeration or injection branch pipe is separated from the underground water remediation well, extends into the underground water remediation well, is positioned below the water surface of the underground water and is close to the bottom of the well. The aeration or injection branch pipe can aerate underground water in the well or inject remediation agents. And the aeration or injection branch pipe and the aeration or injection main pipe jointly repair the pipe network by using underground water. The groundwater remediation pipe network also comprises a valve. The valve is an electric control valve, receives an electric signal of the data processing center, can control the flow of the pipeline, realizes the control of aeration quantity or injection quantity, and is arranged on the ground of each aeration or injection branch pipe.
As a preferred embodiment, the groundwater remediation system further comprises a groundwater remediation complete equipment facility which is centrally arranged on the ground of the contaminated site; the underground water repairing matched equipment comprises a water suction pump, an injection pump, an aeration pump, repairing agent configuration equipment and underground water treatment equipment.
Particularly, the underground water restoration supporting facilities are preferably arranged on the ground in a centralized manner, and are usually arranged in one or more containers and adopt a unified central control system so as to improve the integration level of the underground water restoration supporting facilities.
The underground water repairing supporting equipment comprises a water suction pump 10, an injection pump 8, an aeration pump 9, repairing agent configuration equipment 6 and underground water treatment equipment 7.
Wherein, the water pump 10 is arranged at the position of a water pumping pipe network main pipeline and is used for pumping water. The water pump 10 has the function of receiving the electric signal of the data processing center, and can control the water pumping speed by adjusting the power of the water pump.
The injection pump 8 is arranged at the position of a main pipeline of the repair pipe network and is used for injecting repair agents into underground water. The injection pump has the function of receiving the electric signal of the data processing center, and the injection speed of the medicament can be controlled by adjusting the power of the injection pump.
The aeration pump 9 is arranged at the position of a main pipeline of the restoration pipe network and is used for aerating underground water. The aeration pump has the function of receiving the electric signal of the data processing center, and the aeration quantity can be controlled by adjusting the power of the aeration pump.
The remediation agent preparation device 6 is arranged on the ground and is arranged only when the groundwater remediation system needs to inject remediation agents into the groundwater remediation well. The repairing agent preparation equipment is adjusted according to the actual conditions of each polluted site and the groundwater repairing process, and the model, specification, function and the like of the equipment are not specified.
The underground water treatment equipment 7 is arranged on the ground, and polluted underground water is pumped out by a water pump and then is sent into the underground water treatment equipment for harmless treatment. The water treatment process and equipment are mature and are not the content of the invention, and the invention does not further explain, however, the water treatment process and equipment must be designed specifically according to the characteristic pollutants of the groundwater in the polluted site, so that the pollutants in the water can be treated to reach the standard.
And (4) adjusting the polluted site restoration site according to the actual condition of each polluted site, the underground water restoration process and the specification parameters of main equipment. Other supporting equipment usually comprises pipes, valves, instruments, circuits, switches, storage tanks and the like, and the supporting design is carried out according to the parameters of main equipment, namely an underground water monitoring well, an underground water pumping well group and an underground water repairing well group. The invention does not make specific provisions on the type, specification, function and the like of the matched equipment.
In addition, the invention also discloses a groundwater remediation method of a polluted site, which uses the groundwater remediation system, and the flow chart of the groundwater remediation system is shown in figure 2, and comprises the following steps:
s1, acquiring a water quality monitoring signal by the underground water monitoring well group and transmitting the water quality monitoring signal to a water quality analysis center, and analyzing the water quality monitoring signal into water quality monitoring data by the water quality analysis center;
s2, the water quality analysis center uploads the water quality monitoring data to the data processing center, and the data processing center receives all the operation parameters of the underground water pumping well group, the underground water repairing well group and the underground water repairing matching equipment facility;
s3, the data processing center carries out advanced processing on the water quality monitoring data, and adjusts the parameters of the repair process by combining the operation parameters of each equipment facility;
and S4, carrying out remediation process adjustment on the groundwater pumping well group, the groundwater remediation well group and the groundwater remediation supporting equipment according to the adjusted remediation process parameters sent by the data processing center, carrying out groundwater remediation work, and feeding back groundwater remediation effects through online monitoring data of the groundwater of the polluted site by the groundwater monitoring well group.
The steps of the groundwater remediation method for the polluted site correspond to five levels, and are respectively as follows: (a) the method comprises the following steps of (a) online water quality monitoring, (b) data integration, (c) equipment parameter adjustment, (d) equipment and (e) facilities.
(a) And (5) monitoring the water quality on line. The key elements of the level are water pressure, atmospheric pressure, temperature, turbidity, conductivity, pH, DO, ORP and characteristic pollutant concentration, and the key elements are obtained through a groundwater monitoring well group and a water quality analysis center.
(b) And (6) integrating data. The content of data integration has 2 aspects:
on one hand, the electric signals of all facilities and equipment related by the invention are integrated, including but not limited to the on-off state of each valve, the operation state parameters of each groundwater pumping well, the flow of fluid in each branch pipe and the main pipe of the groundwater pumping pipe network, the operation state parameters of each groundwater remediation well, the flow of fluid in each branch pipe and the main pipe of the groundwater remediation pipe network, the water quality on-line monitoring data output by a water quality analysis center and the operation state parameters of each equipment in the matched facilities for groundwater remediation;
on the other hand, the water quality data are classified and integrated respectively. The 3 types of the water quality data are water level, conventional water quality parameter and underground water pollutant parameter. The integrated processing method of the parameters comprises the following steps: the water level is not influenced by other parameters, and data obtained by monitoring can be directly used as a basis for process adjustment; secondly, the conventional water quality parameters including turbidity, pH, conductivity, DO and ORP are influenced by atmospheric pressure and temperature, and are used as the basis of process adjustment after two-step correction, and the method specifically comprises the following steps:
and 2, correcting: analyzing the main influence factors (which can be one or more) of the conventional water quality parameters, correlating the conventional water quality parameters and the main influence factors to form a mathematical relationship, wherein the mathematical relationship can be used as the basis for process adjustment;
and thirdly, the parameters of the pollutants in the underground water, including the characteristic pollutant concentration of the polluted site, can be one or more, can influence the conventional water quality parameters, directly reflect the change condition of the quality of the underground water, and can be directly used as the basis for process adjustment. Under the condition that the characteristic pollutant concentration parameter cannot be obtained through specific monitoring, the process can be adjusted through the 2 steps of correction.
And after the data processing is finished, the data processing center forms new specific operating parameters corresponding to each device and respectively sends the parameters to each device. The process realizes the function of adjusting the parameters of the equipment in real time according to the water quality on-line monitoring data.
(c) The equipment parameter is adjusted to the corresponding equipment facility.
The water quality parameter (data integration result) -equipment parameter adjustment-equipment-facility is associated and corresponds to four levels.
The device responds after receiving the new operating parameters. The response equipment facilities corresponding to the water quality parameters are as follows:
water level, opening degree, power, valves, pumps (water suction pump, injection pump and aeration pump), underground water pumping well group and underground water pumping pipe network, underground water restoration well group and underground water restoration pipe network;
the conventional water quality parameters, such as opening degree and power, valves and pumps (injection pumps and aeration pumps), underground water restoration well groups and underground water restoration pipe networks;
and thirdly, groundwater pollutant concentration data and change conditions, namely power, repair agent proportion, matched equipment parameters, pumps (injection pumps and aeration pumps), agent configuration equipment and matched equipment, namely groundwater repair well groups, groundwater repair pipe networks and groundwater repair matched equipment facilities.
The concrete steps of remediation will be described below in conjunction with remediation of a contaminated site. The soil of a certain place is mainly silty sandy soil, and groundwater of a submerged layer is polluted by organic matters and is repaired by injecting an oxidizing agent.
Before groundwater remediation work is carried out, the groundwater condition of a polluted site is monitored, and the monitoring result is shown in fig. 3.
The main pollutant of the polluted site is organic pollution, and the polluted site is repaired by adopting an oxidizing agent injection mode. According to the restoration design scheme, when the medicament is initially injected, the operation parameters of each part of the system are as follows:
(1) a groundwater pumping well group and a groundwater pumping pipe network. The valve opening is 50%, and the water pump power is 50%.
(2) Underground water restoration well group and underground water restoration pipe network. The valve opening is 90%, and the injection pump power is 90%.
(3) A medicament dispensing device. The medicament proportioning is carried out according to a design scheme.
(4) A water treatment apparatus. The load was run at 50%.
In the repairing process, the monitoring well monitors that the water quality parameters change, and the monitoring result is shown in fig. 4.
The data is used after 2 steps of correction operation.
1, correction: atmospheric pressure and temperature correction. Atmospheric pressure mainly affects DO; temperature has an effect on pH.
In this case, the atmospheric pressure increased from 998.1hPa to 1033.1hPa, which corresponds to a 3.51% increase in dissolved oxygen in water, and the actual increase was 5.41%, indicating that other factors (1.90%) acted.
In this case, the temperature decreased from 22.70 ℃ to 22.40 ℃, which corresponds to a pH decrease from 6.81 to 6.37, the pH decrease (6.46%) exceeded the temperature change (4.41%), indicating that other factors are contributing (2.05%).
Modification 2: and correcting other water quality parameters. And reading other water quality parameters after the turbidity is stable, and correcting.
(a) And (6) correcting the conductivity. In this case, the conductivity increased from 1440. mu.S/cm to 2273. mu.S/cm, with the magnitude of the increase (58.85%) being greater than the magnitude of the decrease in pH (6.46%), suggesting that other factors may be contributing (52.39%). In this case, it is the effect of the redox agent. Conductivity is too high, indicating the presence of excess oxidizing agent in the groundwater. In this case, the oxidizing agent is a strong electrolyte, having a greater effect on conductivity than on pH, in a ratio of about 25.56: 1, it is believed that conductivity is more indicative of excess oxidizing agent in the groundwater.
(b) And (6) pH correction. In this case, the pH is influenced mainly by the oxidizing agent (by an extent of 2.05%) excluding the influence of temperature. The pH drop indicates the presence of a small excess of oxidizing agent in the groundwater.
(c) And (6) DO correction. In this case, DO rises from 0.37mg/L to 0.39mg/L, and after excluding the effect of atmospheric pressure (effect amplitude of 3.51%), the rise in DO is mainly due to the presence of oxidizing agents in the groundwater (effect amplitude of 1.90%). In addition, a decrease in contaminant concentration also resulted in a slight increase in DO (much less than 1.90% affected).
(d) And (4) correcting the ORP. ORP is a numerical value that comprehensively reflects the chemical composition of a water body. In this case, the ORP increased from-139 mV to 46mV, reflecting the pH drop, DO rise, contaminant reduction, and level of oxidizing agent in the groundwater. In this case, the influence factor of ORP is excessive and used as a qualitative analysis.
After the numerical correction and analysis of the 2 steps, the problems reflected by the groundwater water quality monitoring data can be obtained: in this case, in addition to directly reflecting the measured value of the characteristic pollutant concentration, the conductivity, pH, DO, ORP parameters indirectly reflect the change trend of the characteristic pollutant concentration by reflecting the content of the oxidizing agent in the groundwater, that is, after the polluted groundwater is repaired for a period of time, the characteristic pollutant concentration is reduced, the content of the oxidizing agent in the groundwater is increased, and the oxidizing agent is slightly excessive.
In this case, the main reference index for characterizing whether the oxidizing agent is excessive is the conductivity, and the rise of the excessive conductivity is 52.39%, considering that after the safety factor of the concentration of the oxidizing agent designed in this case is 0.25, the oxidizing agent is excessive by 21.91% under the above process conditions. Namely, the dosage of the oxidation reagent can be reduced by 21.91 percent on the premise of ensuring the groundwater remediation effect.
After the process adjustment is carried out according to the problems reflected by the data, the operation parameters of each part of the system are as follows:
(1) a groundwater pumping well group and a groundwater pumping pipe network. The groundwater level drops in the design range, and the parameters of the device are not required to be adjusted, namely, the valve opening is kept at 50%, and the power of the water pump is kept at 50%.
(2) Underground water restoration well group and underground water restoration pipe network. The concentration of pollutants in the groundwater is reduced, the repairing agent is slightly excessive, and the parameters of the equipment in the part need to be adjusted, namely, the injection amount of the oxidizing agent is reduced by 20 percent, specifically, the opening of a valve is reduced by 70 percent, and the power of an injection pump is reduced by 70 percent.
(3) A medicament dispensing device. The oxidizing agent has good repairing effect on pollutants, and the ratio of the agent does not need to be adjusted.
(4) A water treatment apparatus. The working parameters of the underground water pumping equipment are not changed, but the concentration of pollutants in pumped underground water is reduced, the working load of the water treatment equipment is correspondingly reduced, and the adjusted equipment load is operated according to 30 percent.
Compared with the defects and shortcomings of the prior art, the underground water remediation system and the remediation method for the polluted site are reasonable in arrangement, can monitor conventional parameters of underground water and characteristic pollutant parameters of underground water on line, feed monitoring results back to the remediation system in real time, and timely adjust process parameters by the remediation system according to the on-line monitoring results.
The present invention is not limited to the above embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which are the same as or similar to the technical solutions of the present invention, fall within the protection scope of the present invention.
Claims (10)
1. The underground water remediation system for the polluted site is characterized by comprising an underground water monitoring well group, an underground water pumping well group, an underground water remediation well group, a water quality analysis center and a data processing center; monitoring wells in the underground water monitoring well group are connected with a pumping main pipe through pumping branch pipes, comprehensive water quality monitoring probes are arranged in the monitoring wells, and atmospheric pressure monitoring probes are arranged on the ground outside the monitoring wells; the water quality analysis center receives a water quality monitoring signal of the comprehensive water quality monitoring probe, analyzes the water quality monitoring signal and sends an analysis result to the data processing center; the data processing center carries out advanced processing on the water quality monitoring signals and outputs results to the underground water pumping well group and the underground water repairing well group; the output result of the data processing center comprises underground water online monitoring information, early warning information and process parameter adjusting information, underground water repairing process parameters are matched and adjusted in a targeted mode according to the actual situation of a polluted site repairing project, and underground water online monitoring data are converted into independent process parameters of each device and facility in the underground water repairing system.
2. A groundwater remediation system as claimed in claim 1 wherein the integrated water quality monitoring probe measures water level, temperature, pH, ORP, conductivity, turbidity, DO and water quality monitoring signals for the characteristic contaminant concentrations in the contaminated site on-line, the water quality monitoring signals being represented using electrical signals.
3. A groundwater remediation system as claimed in claim 2 wherein the water quality analysis centre analyses all electrical signals of the integrated water quality monitoring probe by means of a water quality analysis apparatus.
4. A groundwater remediation system as claimed in claim 1 wherein the groundwater remediation well group includes an aeration or injection header pipe located at the surface of the contaminant, an aeration or injection branch pipe being located at the groundwater remediation well, the aeration or injection branch pipe extending into the groundwater remediation well below the surface of the groundwater and near the bottom of the well; the aeration or injection branch pipe can aerate the underground water in the repair well or inject a repair agent.
5. A groundwater remediation system as claimed in claim 1 further comprising a groundwater remediation kit centrally located on the ground of the contaminated site; the underground water repairing matched equipment comprises a water suction pump, an injection pump, an aeration pump, repairing agent configuration equipment and underground water treatment equipment.
6. A groundwater remediation method for a contaminated site using the groundwater remediation system of any one of claims 1 to 5, comprising the steps of:
s1, acquiring a water quality monitoring signal by the underground water monitoring well group and transmitting the water quality monitoring signal to a water quality analysis center, and analyzing the water quality monitoring signal into water quality monitoring data by the water quality analysis center;
s2, the water quality analysis center uploads the water quality monitoring data to the data processing center, and the data processing center receives all the operation parameters of the underground water pumping well group, the underground water repairing well group and the underground water repairing matching equipment facility;
s3, the data processing center carries out advanced processing on the water quality monitoring data, and adjusts the parameters of the repair process by combining the operation parameters of each equipment facility;
and S4, carrying out remediation process adjustment on the groundwater pumping well group, the groundwater remediation well group and the groundwater remediation supporting equipment according to the adjusted remediation process parameters sent by the data processing center, carrying out groundwater remediation work, and feeding back groundwater remediation effects through online monitoring data of the groundwater of the polluted site by the groundwater monitoring well group.
7. A groundwater remediation method as claimed in claim 6 wherein the data processing centre integrates the electrical signals of all facilities and equipment and performs classification processing on the water quality monitoring data; the water quality monitoring data comprises water level, conventional water quality parameters and underground water pollutant parameters.
8. A groundwater remediation method as claimed in claim 7 wherein the water level is not affected by conventional water quality parameters and groundwater contaminant parameters and the data obtained from monitoring can be used directly as a basis for process adjustment.
9. A groundwater remediation method as claimed in claim 7 wherein the conventional water quality parameter is influenced by atmospheric pressure and temperature, the variation of the conventional water quality parameter needs to be corrected using atmospheric pressure and temperature data to exclude the influence of atmospheric pressure and temperature on the conventional water quality parameter; and analyzing the main influence factors of the conventional water quality parameters, and correlating the conventional water quality parameters and the main influence factors to form a mathematical relationship, wherein the mathematical relationship is used as the basis for process adjustment.
10. A groundwater remediation method as claimed in claim 7 wherein the groundwater contaminant parameters are such as to affect conventional water quality parameters, and the data obtained from monitoring can be used directly as a basis for process adjustment.
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