CN211688569U - Underground water light non-aqueous phase liquid pollutant cleaning system - Google Patents
Underground water light non-aqueous phase liquid pollutant cleaning system Download PDFInfo
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- CN211688569U CN211688569U CN201921822724.9U CN201921822724U CN211688569U CN 211688569 U CN211688569 U CN 211688569U CN 201921822724 U CN201921822724 U CN 201921822724U CN 211688569 U CN211688569 U CN 211688569U
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Abstract
The utility model belongs to the technical field of polluted groundwater environment remediation engineering, in particular to a groundwater light non-aqueous phase liquid pollutant cleaning system, which comprises a sewage treatment module, a groundwater extraction well filled with a groundwater layer and a light non-aqueous phase liquid layer, wherein the light non-aqueous phase liquid layer floats on the surface of the groundwater layer, and the groundwater cleaning system also comprises a groundwater level monitoring module, a liquid phase extraction module and a gas phase extraction module; the underground water level monitoring module is used for monitoring the liquid level of the underground water extraction well in real time and feeding the liquid level back to the liquid phase extraction module and the gas phase extraction module; the liquid phase pumping module is used for pumping light non-aqueous phase liquid on the surface of underground water to the sewage treatment module according to the liquid level; the gas phase pumping module is used for vacuumizing the upper part of the underground water extraction well according to the liquid level to form negative pressure to the sewage treatment module. The system can greatly improve the repair efficiency and repair effect of the non-aqueous phase liquid, can reduce or eliminate the influence of the tailing effect, and avoids the expansion of the pollution range of the non-aqueous phase liquid.
Description
Technical Field
The utility model belongs to the technical field of pollute groundwater environment repair engineering, concretely relates to groundwater light non-aqueous phase liquid pollutant clearance system.
Background
The groundwater is an important component of water resources, and is one of important water sources for agricultural irrigation, industrial and mining and cities due to stable water yield and good water quality. In addition, the underground water has the characteristics of wide distribution, excellent water quality and the like, and the effect of the underground water in the life of people cannot be ignored. However, the problem of groundwater pollution is becoming more serious due to conscious or unconscious destruction of people, such as discharge of municipal sewage, discharge of industrial three wastes, use of a large amount of pesticides and fertilizers, and the like.
The groundwater remediation technology comprises an extraction-treatment technology, a multiphase extraction technology, an air injection technology, a circulating well technology, an electric remediation technology, an in-situ heat treatment technology, an in-situ chemical oxidation (reduction) technology, a permeable reactive barrier technology, a natural depletion technology and the like.
The multiphase extraction (MPE) technology is an environment restoration technology which controls and restores organic pollution in underground water by simultaneously extracting soil gas, underground water and non-aqueous phase liquid (NAPL) in an underground pollution area to the ground by means of vacuum extraction and the like to carry out phase separation and treatment. Compared with the traditional groundwater remediation technology, the multiphase extraction technology can treat pollutants in the forms of steam, groundwater and non-aqueous phase liquid (NAPL) at the same time, has a wider pollutant treatment range, and has more remarkable remediation effect on polluted groundwater, especially on polluted groundwater containing NAPL. The multiphase extraction technology is suitable for treating volatile and mobile non-aqueous phase liquid (NAPL), such as gasoline, diesel oil, organic solvent, etc. But are not suitable for sites with poor permeability or large groundwater level fluctuations.
Multiphase extraction systems can be further divided into single pump systems and dual pump systems. Wherein, the single pump system only provides extraction power by vacuum equipment, is only suitable for places with better permeability, and the treatment depth is generally within 10 m. The double-pump system provides extraction power by the vacuum equipment and the water pump together, the system is flexible to operate, has good adaptability to aquifers within a certain range, and the repair depth can be larger than 10 m. However, conventional dual pump multiphase extraction systems also have problems in handling light non-aqueous liquids (LNAPL):
(1) light non-aqueous liquid (LNAPL) has the characteristics of small specific gravity and non-miscibility in water, and LNAPL exceeding the soil retention capacity generally floats above the submergible surface to form a floating oil layer. LNAPL pollutants in the floating oil layer can be continuously dissolved in water, and the pollution range of the LNAPL pollutants is easily expanded along with the fluctuation of the groundwater level. Although traditional multiphase extraction can extract LANPL and converge to an extraction well, floating oil layers are difficult to control to descend along the funnel surface of the underground water level and remain in aquifers, so that the repair efficiency of underground water is reduced, the tailing effect is aggravated, and meanwhile, the pollution range is expanded.
(2) The liquid phase and gas phase extraction amount of the traditional multiphase extraction system has large fluctuation, the load impact on the subsequent multiphase separation and pollutant treatment links is large, and the treatment efficiency and the treatment effect are reduced.
Disclosure of Invention
The utility model aims at overcoming the problem of low repair efficiency of the traditional multiphase extraction system in the prior art.
Therefore, the utility model provides an underground water light non-aqueous phase liquid pollutant cleaning system, including sewage treatment module, fill groundwater of groundwater level and light non-aqueous phase liquid layer and draw the well, light non-aqueous phase liquid layer floats in groundwater level surface still includes groundwater level monitoring module, liquid phase and takes out module and gaseous phase and take out the module;
the underground water level monitoring module is used for monitoring the liquid level of the underground water extraction well in real time and feeding the liquid level back to the liquid phase extraction module and the gas phase extraction module;
the liquid phase pumping module is used for pumping light non-aqueous phase liquid on the surface of underground water to the sewage treatment module according to the liquid level;
and the gas phase pumping module is used for vacuumizing the upper part of the underground water extraction well according to the liquid level to form negative pressure to the sewage treatment module.
Preferably, the ground water level monitoring module comprises a central controller and a water level sensor positioned in the light non-aqueous phase liquid, and the water level sensor is electrically connected with the central controller.
Preferably, the liquid phase extraction module comprises an extraction water pump, the extraction water pump is immersed in the light non-aqueous phase liquid, an extraction control valve is arranged on a connection pipeline between the extraction water pump and the liquid phase inlet of the sewage treatment module, and the extraction control valve is electrically connected with the central controller.
Preferably, the extraction pump is connected by a telescopic assembly movable longitudinally along the groundwater extraction well.
Preferably, the telescopic assembly comprises a motor and a worm and gear structure, the motor is electrically connected with the central controller, the input end of the worm and gear structure is connected with the motor, and the output end of the worm and gear structure is connected with the pumping water pump.
Preferably, the gas phase pumping-out module comprises a vacuum pump, the vacuum pump is positioned at the top end of the underground water pumping-out well, a vacuum control valve is arranged on a connecting pipeline of the vacuum pump and a gas phase inlet of the sewage treatment module, and the vacuum control valve is electrically connected with the central controller.
Preferably, the vacuum pump is a liquid ring pump, a jet pump or a blower.
Preferably, the upper part of the underground extraction well is hermetically connected through a well cover.
Preferably, the liquid level is the height of the surface position of the layer of light non-aqueous liquid floating above the groundwater layer.
Preferably, the sewage treatment module comprises an oil-water separator, a coagulating sedimentation device and an activated carbon adsorption device.
The utility model has the advantages that: the utility model provides a light non-aqueous phase liquid pollutant cleaning system of groundwater, including sewage treatment module, fill groundwater extraction well of groundwater layer and light non-aqueous phase liquid layer, light non-aqueous phase liquid layer floats on the groundwater layer surface, still include groundwater level monitoring module, liquid phase take out the module and the gaseous phase takes out the module; the underground water level monitoring module is used for monitoring the liquid level of the underground water extraction well in real time and feeding the liquid level back to the liquid phase extraction module and the gas phase extraction module; the liquid phase pumping module is used for pumping light non-aqueous phase liquid on the surface of underground water to the sewage treatment module according to the liquid level; the gas phase pumping module is used for vacuumizing the upper part of the underground water extraction well according to the liquid level to form negative pressure to the sewage treatment module. The system can greatly improve the extraction efficiency of the non-aqueous phase liquid, can effectively extract the non-aqueous phase liquid in a short construction period, greatly improve the repair efficiency and the repair effect, reduce or eliminate the influence of a tailing effect, and avoid the expansion of the pollution range of the non-aqueous phase liquid. The utility model discloses it is showing to contain light non-aqueous phase liquid pollution groundwater remediation effect, also can be used to the restoration in conventional groundwater pollution place. The utility model discloses intelligent degree is high, easy operation, and is suitable for extensively, weak point consuming time, and is economical feasible, applicable in the restoration in each type groundwater pollution place, has realized the utilization of resources in soil, has good environmental benefit and social.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of the underground water light non-aqueous phase liquid pollutant cleaning system.
Description of reference numerals: the system comprises a pumping water pump 1, a vacuum pump 2, a central controller 3, a pumping control valve 4, a vacuum control valve 5, a water level sensor 6, a sewage treatment module 7, a liquid phase inlet 71, a gas phase inlet 72, a well lid 8 and an underground water pumping well 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The embodiment of the utility model provides a groundwater light non-aqueous phase liquid pollutant clearance system, including sewage treatment module 7, fill groundwater of groundwater layer and light non-aqueous phase liquid layer and extract well 9, light non-aqueous phase liquid layer floats in groundwater layer surface, still include groundwater level monitoring module, liquid phase and take out module and gaseous phase and take out the module; the underground water level monitoring module is used for monitoring the liquid level of the underground water extraction well 9 in real time and feeding the liquid level back to the liquid phase extraction module and the gas phase extraction module; the liquid phase pumping module is used for pumping light non-aqueous phase liquid on the surface of underground water to the sewage treatment module 7 according to the liquid level; the gas phase pumping module is used for vacuumizing the upper part of the underground water extraction well 9 according to the liquid level to form negative pressure to the sewage treatment module 7.
Therefore, the liquid level height in the underground water extraction well 9 is monitored in real time through the water level monitoring module, when the height is too high, the power of the liquid phase extraction module needs to be correspondingly increased, and meanwhile, the power of the gas phase extraction module is reduced, wherein the liquid phase extraction module is positioned in the light non-aqueous phase layer, the gas phase extraction module is positioned at the top end of the underground extraction well, and the liquid extraction flow rate and the gas phase extraction module are matched to maintain the underground water level to be stable within a set depth range.
Light non-aqueous liquid (LNAPL) is poor in water solubility, is distributed on the surface layer of underground water and greatly fluctuates with the water level of the underground water, and when the underground water level changes, the pumping efficiency of the pumping-out water pump 1 also changes. By utilizing the characteristics, according to the distribution area (depth, range and thickness) of the light non-aqueous phase liquid which is already found by the underground water level monitoring module, the position of a water inlet of the liquid phase pumping module is designed to be slightly lower than the lower interface of the light non-aqueous phase liquid layer, the non-aqueous phase liquid is preferentially pumped out, the vacuum pump 2 is started while the pumping water pump is started, the water level drop generated by pumping water and the water level lift generated by the negative pressure of the vacuum pump 2 are overlapped through intelligent interlocking control, the stable underground water level is maintained while the stable liquid pumping flow is ensured, and the condition that the underground water level changes greatly is avoided.
The system can greatly improve the extraction efficiency of the non-aqueous phase liquid, can effectively extract the non-aqueous phase liquid in a short construction period, greatly improve the repair efficiency and the repair effect, reduce or eliminate the influence of a tailing effect, and avoid the expansion of the pollution range of the non-aqueous phase liquid.
Preferably, the groundwater level monitoring module comprises a central controller 3 and a water level sensor 6 positioned in the light non-aqueous phase liquid, and the water level sensor 6 is electrically connected with the central controller 3. The central controller 3 collects the height position of the underground water level through the water level sensor 6 and then controls the power of the liquid phase extraction module and the gas phase extraction module.
Preferably, the liquid phase extraction module comprises an extraction water pump 1, the extraction water pump 1 is immersed in the light non-aqueous phase liquid, an extraction control valve 4 is installed on a connection pipeline between the extraction water pump 1 and the liquid phase inlet 71 of the sewage treatment module 7, and the extraction control valve 4 is electrically connected with the central controller 3. As shown in fig. 1, the pump 1 is drawn out to potentially intersect the non-light liquid phase layer with the groundwater layer. The pumping-out water pump 1 is connected with the pumping-out control valve 4 through a pipeline, and the pumping-out control valve 4 is connected with a liquid phase inlet 71 at the upper part of the sewage treatment module 7 through a pipeline. The water level sensor 6 is connected with the central controller 3 through a signal transmission line, and the central controller 3 controls the valve opening of the pumping control valve 4 by knowing the water level height through the water level sensor 6 so as to control the pumping speed.
Preferably, the extraction pump 1 is connected by a telescopic assembly movable longitudinally along the groundwater extraction well 9. When the water level changes greatly, the height of the water pump 1 can be adjusted by adjusting the telescopic assembly.
Preferably, the telescopic assembly comprises a motor and a worm and gear structure, the motor is electrically connected with the central controller 3, the input end of the worm and gear structure is connected with the motor, and the output end of the worm and gear structure is connected with the pumping water pump 1. After the central controller 3 knows that the water level changes, the height of the pumping water pump 1 can be controlled to ensure that the pumping water pump 1 is always positioned at the bottom of the non-light liquid phase layer.
Preferably, the gas phase pumping-out module comprises a vacuum pump 2, the vacuum pump 2 is positioned at the top end of the groundwater extraction well 9, a vacuum control valve 5 is arranged on a connecting pipeline of the vacuum pump 2 and the gas phase inlet 72 of the sewage treatment module 7, and the vacuum control valve 5 is electrically connected with the central controller 3. When the central controller 3 knows that the ground water level is lowered, the opening degree of the vacuum control valve 5 is increased. The pumping water pump 1 can adjust the depth of the water inlet to be positioned in a light non-aqueous phase liquid area according to the groundwater level and the thickness of the non-aqueous phase liquid, and can adjust the depth along with a water level signal fed back by the water level sensing device, so that the light non-aqueous phase liquid above the groundwater level is preferentially pumped. The pumping water pump 1 can select proper pumping power supply mode, power, specification, material and the like according to physicochemical properties of pumped pollutants, underground water pollution depth, pumping well backwater rate and the like.
The vacuum pump 2 can form negative pressure in the underground water extraction well 9 by vacuumizing, and can not only extract and treat volatile organic compounds in a water-containing layer, but also generate a negative hydraulic gradient flowing to the extraction well, and generate a water level lift equal to the vacuum degree in the extraction well. The vacuum pump 2 adjusts the flow of the vacuum pump 2 along with the water level signal fed back by the water level sensing device through the control of the central controller 3 and the vacuum control valve 5, so that the water level generated by pumping water from the water pump 1 is superposed with the water level generated by the negative pressure of the vacuum pump 2, the flow of liquid extraction is ensured, the groundwater level is maintained to be stable at a set depth, and the condition that the groundwater level changes greatly is avoided. The vacuum pump 2 can select a proper extraction power supply mode, power, specification, material and the like according to physicochemical properties of the volatile pollutants to be extracted, groundwater pollution depth, vacuum degree to be maintained and the like. The liquid ring pump, the jet pump, the blower and the like can be selected according to specific conditions.
The central controller 3 is the intelligent control module of the system, the module can receive the water level and flow (pressure) signals from the water level sensor 6, the control valve 4 is pumped out and the control valve 4 is pumped out, the water level signals transmitted by the underground water level sensing device and the preset underground water level limit value are compared and analyzed, corresponding instruction signals are respectively transmitted to the control valve 4 and the control valve 4, the flow (pressure) of the water pump 1 and the vacuum pump 2 is controlled to be pumped out, and the underground water level is maintained to be stable in the set depth range while the liquid extraction flow is ensured.
The water level sensor 6 can transmit the real-time water level of the underground water to the central controller 3, the water level signal transmitted by the underground water level sensing device is compared and analyzed with the preset limit value of the water level of the underground water through the central controller 3, and corresponding instruction signals are transmitted to the pumping control valve 4 and the pumping control valve 4 respectively so as to control and adjust the flow (pressure) of the pumping water pump 1 and the vacuum pump 2, thereby ensuring the liquid extraction flow and simultaneously maintaining the stable underground water level within the set depth range.
In the preferred scheme, the upper part of the underground extraction well is hermetically connected through a well cover 8. The underground extraction well is sealed by a well cover 8, and the vacuum pump 2 can vacuumize the water level to form negative pressure.
Preferably, the liquid level is the height of the surface position of the layer of light non-aqueous liquid floating on the groundwater layer.
In a preferred scheme, the sewage treatment module 7 comprises an oil-water separator, a coagulating sedimentation device and an activated carbon adsorption device. The sewage treatment module 7 is a combination of conventional treatment equipment, and is provided with a multiphase separation unit, a sewage treatment unit and a gas treatment unit, and the processes of the units can be configured according to the types of pollutants, such as oil-water separation, coagulation precipitation, advanced oxidation, activated carbon adsorption and the like.
In one particular real-time scenario:
constructing an underground water extraction well 9 according to the underground hydrogeological conditions and the underground water pollution conditions of the polluted site; designing the number of extraction wells and extraction flow according to the permeability and the water return rate of underground water and the project construction period; designing the size of a pumping water pump 1 according to the size of the well diameter of an underground water extraction well 9; designing the unit configuration of the sewage treatment module 7 and the process parameters thereof according to the characteristics and the concentration of the underground water pollutants; according to the ascertained distribution area (depth, range and thickness) of the light non-aqueous phase liquid, the position of a water inlet of a pumping water pump 1 is designed to be slightly lower than the lower interface of a light non-aqueous phase liquid layer, and the non-aqueous phase liquid is preferentially pumped; and completing the connection of all the devices through pipelines, and starting the multiphase extraction repair treatment of the underground water after completing the debugging of the multiphase extraction control system and the multiphase separation and treatment device.
The vacuum pump 2 is started when the pumping water pump 1 is started, and the pumping water pump and the vacuum pump are controlled in an intelligent linkage mode, and the water level generated by pumping water and the water level generated by the negative pressure of the vacuum pump 2 are overlapped, so that the stability of the water level of underground water is maintained while the liquid extraction flow is ensured. After the extracted fluid is subjected to multiphase separation, the pollutant-containing fluid is divided into a gas phase, a liquid phase and an organic phase, and the phases are respectively treated and discharged into a municipal sewage pipe network or recycled after reaching the standard. And (3) periodically taking a water sample at the water inlet of the sewage treatment facility for detection, stopping multiphase extraction treatment after the water inlet detection meets the repair standard, checking and detecting the groundwater in the extraction range, and stopping repair construction and field withdrawal after the groundwater reaches the standard.
The system can greatly improve the extraction efficiency of the non-aqueous phase liquid, can effectively extract the non-aqueous phase liquid in a short construction period, greatly improve the repair efficiency and the repair effect, reduce or eliminate the influence of a tailing effect, and avoid the expansion of the pollution range of the non-aqueous phase liquid. The utility model discloses it is showing to contain light non-aqueous phase liquid pollution groundwater remediation effect, also can be used to the restoration in conventional groundwater pollution place. The utility model discloses intelligent degree is high, easy operation, and is suitable for extensively, weak point consuming time, and is economical feasible, applicable in the restoration in each type groundwater pollution place, has realized the utilization of resources in soil, has good environmental benefit and social.
The above illustration is merely an illustration of the present invention, and does not limit the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.
Claims (10)
1. The utility model provides a groundwater light non-aqueous phase liquid pollutant clean-up system, includes sewage treatment module, contains groundwater of groundwater layer and light non-aqueous phase liquid layer and extracts the well, light non-aqueous phase liquid layer float in groundwater layer surface, its characterized in that: the system also comprises an underground water level monitoring module, a liquid phase extraction module and a gas phase extraction module;
the underground water level monitoring module is used for monitoring the liquid level of the underground water extraction well in real time and feeding the liquid level back to the liquid phase extraction module and the gas phase extraction module;
the liquid phase pumping module is used for pumping light non-aqueous phase liquid on the surface of underground water to the sewage treatment module according to the liquid level;
and the gas phase pumping module is used for vacuumizing the upper part of the underground water extraction well according to the liquid level to form negative pressure to the sewage treatment module.
2. A groundwater light non-aqueous phase liquid contaminant removal system as claimed in claim 1, wherein: the underground water level monitoring module comprises a central controller and a water level sensor positioned in the light non-aqueous phase liquid, and the water level sensor is electrically connected with the central controller.
3. A groundwater light non-aqueous phase liquid contaminant removal system as claimed in claim 2, wherein: the liquid phase pumping module comprises a pumping water pump, the pumping water pump is immersed in the light non-aqueous phase liquid, a pumping control valve is arranged on a connecting pipeline of the pumping water pump and the liquid phase inlet of the sewage treatment module, and the pumping control valve is electrically connected with the central controller.
4. A groundwater light non-aqueous phase liquid contaminant removal system as claimed in claim 3, wherein: the pumping water pump is connected through a telescopic assembly which can move longitudinally along the underground water extraction well.
5. A groundwater light non-aqueous phase liquid contaminant removal system as claimed in claim 4, wherein: the telescopic assembly comprises a motor and a worm and gear structure, the motor is electrically connected with the central controller, the input end of the worm and gear structure is connected with the motor, and the output end of the worm and gear structure is connected with the pumping water pump.
6. A groundwater light non-aqueous phase liquid contaminant removal system as claimed in claim 2, wherein: the gas phase pumping module comprises a vacuum pump, the vacuum pump is positioned at the top end of the underground water pumping well, a vacuum control valve is arranged on a connecting pipeline of the vacuum pump and a gas phase inlet of the sewage treatment module, and the vacuum control valve is electrically connected with the central controller.
7. A groundwater light non-aqueous phase liquid contaminant removal system as claimed in claim 6, wherein: the vacuum pump is a liquid ring pump, a jet pump or a blower.
8. A groundwater light non-aqueous phase liquid contaminant removal system as claimed in claim 1, wherein: the upper part of the underground water extraction well is hermetically connected through a well cover.
9. A groundwater light non-aqueous phase liquid contaminant removal system as claimed in claim 1, wherein: the liquid level is the height of the surface position of the light non-aqueous liquid layer floating on the groundwater layer.
10. A groundwater light non-aqueous phase liquid contaminant removal system as claimed in claim 1, wherein: the sewage treatment module comprises an oil-water separator, a coagulating sedimentation device and an activated carbon adsorption device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110627263A (en) * | 2019-10-28 | 2019-12-31 | 中冶南方都市环保工程技术股份有限公司 | Underground water light non-aqueous phase liquid pollutant cleaning system |
| CN114482926A (en) * | 2020-11-13 | 2022-05-13 | 中国石油天然气集团有限公司 | Multi-well position full-automatic free phase oil collecting device |
-
2019
- 2019-10-28 CN CN201921822724.9U patent/CN211688569U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110627263A (en) * | 2019-10-28 | 2019-12-31 | 中冶南方都市环保工程技术股份有限公司 | Underground water light non-aqueous phase liquid pollutant cleaning system |
| CN114482926A (en) * | 2020-11-13 | 2022-05-13 | 中国石油天然气集团有限公司 | Multi-well position full-automatic free phase oil collecting device |
| CN114482926B (en) * | 2020-11-13 | 2024-03-01 | 中国石油天然气集团有限公司 | Multi-well-position full-automatic free-phase oil collecting device |
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