CN111994973A - Underground water halohydrocarbon in-situ multi-stage circulating repair system - Google Patents
Underground water halohydrocarbon in-situ multi-stage circulating repair system Download PDFInfo
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- CN111994973A CN111994973A CN202010828097.0A CN202010828097A CN111994973A CN 111994973 A CN111994973 A CN 111994973A CN 202010828097 A CN202010828097 A CN 202010828097A CN 111994973 A CN111994973 A CN 111994973A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/36—Organic compounds containing halogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Abstract
An in-situ multi-stage circulating repair system for halogenated hydrocarbons in underground water comprises: the pumping reaction wells are distributed at the inner edge of the pollution feather, the injection reaction wells are distributed in the pollution feather, auxiliary reagent adding units are arranged among the injection reaction wells, and the monitoring wells are uniformly distributed in the pollution range; filling a first-stage reaction filler between the well wall of the pumped reaction well and the wall of the well hole; a submersible pump is arranged in the pumping reaction well and is connected with and injected into the reaction well through a water delivery pipeline; a second-stage reaction filler is filled between the well wall of the injection reaction well and the well wall of the well; the well mouth of the pumping reaction well and the well mouth of the injection reaction well are both provided with pumping injection start-stop controllers; the pumping reaction well and the injection reaction well are provided with sieve pores at all sections and are fully covered with pollution feathers in the vertical direction; the medicament barrel in the auxiliary medicament adding unit is connected to a water pipeline through a dosing metering pump and a valve; an online monitoring probe is arranged in the monitoring well and is connected with an online data device.
Description
Technical Field
The invention belongs to the field of underground water science and engineering and environmental engineering, and particularly relates to an underground water halogenated hydrocarbon in-situ multi-stage circulating repair system.
The invention also relates to a method for repairing underground water by using the repairing system.
Background
Halogenated hydrocarbons are an important class of organic synthetic intermediates, which are raw materials for many organic syntheses, and the halogenated hydrocarbons can be used as fire extinguishing agents (such as carbon tetrachloride), refrigerants (such as Freon), cleaning agents (common dry cleaning agents and machine part detergents), pesticides (such as hexachloro-cyclohexane which is now banned), raw materials for polymer industries (such as vinyl chloride and tetrafluoroethylene), and the like, which are closely related to our lives.
Underground water is an important component of fresh water resources and plays a very important role in the development of human society, but leakage in the production, processing and use processes of products in the industries of petroleum, chemical engineering, pesticide and the like causes serious water and soil pollution, wherein halogenated hydrocarbon pollutants are common pollutants in underground water.
The extraction treatment technology is the most common ex-situ remediation technology aiming at the pollution of halogenated hydrocarbons in underground water, and has obvious effects on the aspects of removing pollution sources, controlling pollution plumes, reducing the concentration of water-phase pollutants and the like.
The permeable reactive barrier technology is a common in-situ remediation technology for remedying the halogenated hydrocarbon pollution of underground water, reaction fillers are filled in the downstream of pollution plumes, pollutants flow through reaction materials under the condition of natural water flow and are removed, and the permeable reactive barrier technology has the advantages of low operation cost, long validity period and the like. However, the technology is easy to cause the problems of reaction material inactivation, filler blockage and the like, pollutants are driven to flow through the reaction wall completely by virtue of hydraulic gradient, and the reaction retention time is greatly influenced by the change of the hydraulic gradient.
The invention provides an underground water halohydrocarbon in-situ multistage circulating remediation system, which adopts pumping and reinjection hydraulic circulation and combines multistage in-situ reaction fillers to treat halohydrocarbon polluted underground water, so that efficient removal of pollutants and control of pollution plume can be realized simultaneously; and the repairing effect is monitored in real time by matching with an online monitoring unit.
Disclosure of Invention
The invention aims to provide an in-situ multi-stage circulating repair system for halogenated hydrocarbons in underground water.
Still another object of the present invention is to provide a method for groundwater remediation using the remediation system described above.
In order to achieve the above object, the present invention provides an in-situ multi-stage circulating remediation system for halogenated hydrocarbons in groundwater, comprising:
a plurality of extraction reaction wells are distributed at the inner edge of the pollution plume, a plurality of injection reaction wells are distributed inside the pollution plume, an auxiliary reagent adding unit is arranged between the injection reaction wells, and a plurality of monitoring wells are uniformly distributed in the pollution range;
a first-stage reaction filler is filled between the well wall of the pumped reaction well and the wall of the well hole and is used for reducing the hardness of underground water and removing metal ions in the water;
a submersible pump is arranged in the pumping reaction well and is connected with and injected into the reaction well through a water delivery pipeline;
filling a secondary reaction filler between the well wall of the injection reaction well and the well wall of the well hole to remove halogenated hydrocarbon pollutants in the underground water;
the well mouth of the pumping reaction well and the well mouth of the injection reaction well are both provided with pumping injection start-stop controllers;
the pumping reaction well and the injection reaction well are provided with sieve pores at all sections and are fully covered with pollution feathers in the vertical direction;
the medicament barrel in the auxiliary medicament adding unit is connected to a water pipeline through a dosing metering pump and a valve;
an online monitoring probe is arranged in the monitoring well and is connected with an online data device.
The underground water halogenated hydrocarbon in-situ multistage circulating repair system is characterized in that the first-stage reaction filler filled between the well wall of the pumped reaction well and the well wall of the well is manganese sand and/or zeolite, and the particle size of the first-stage reaction filler is 2-4 mm.
The underground water halohydrocarbon in-situ multistage circulating repair system is characterized in that secondary reaction fillers filled between the well wall of the injection reaction well and the well wall of the well hole are mixed fillers of zero-valent iron, activated carbon and quartz sand, the particle size is 4-10mm, and the mass ratio of the filled zero-valent iron is 20-50%.
The underground water halogenated hydrocarbon in-situ multistage circulating remediation system is characterized in that the auxiliary agent adding unit is used for adding biological agents, surfactants and/or filler activating agents into underground water through pipeline mixing.
The underground water halogenated hydrocarbon in-situ multistage circulating repair system is characterized in that the diameter of a drilled hole of the pumping reaction well is not less than 3 times of the diameter of a well pipe of the pumping reaction well.
The underground water halogenated hydrocarbon in-situ multistage circulating repair system is characterized in that the diameter of a drill hole of the injection reaction well is not less than 4 times of the diameter of a well pipe of the injection reaction well.
The method for repairing sewage by using the underground water halogenated hydrocarbon in-situ multistage circulating repair system comprises the following steps:
the hardness of the underground water pumped by a submersible pump in the pumping reaction well is reduced by a first-stage reaction filler, metal ions and suspended matters in the water are removed, the underground water enters the pumping reaction well through a water conveying pipeline and is reinjected underground, and halogenated hydrocarbon pollutants in the underground water are removed by a second-stage reaction filler;
an online monitoring probe in the monitoring well monitors the water temperature, water level, pH, ORP, dissolved oxygen and conductivity of underground water in real time, and collects and transmits back the underground water through an online data collecting device;
the medicament of the medicament barrel is injected into the ground from the injection reaction well through a dosing metering pump and a valve through a water delivery pipeline;
the pumping injection start-stop controller controls the start-stop operation of the submersible pump according to the water level change in the well hole.
The invention has the following effects:
active reaction fillers are filled between the walls and the walls of the pumping well and the injection well, and underground water flows through the pumping reaction well and the injection reaction well step by step in the pumping and injection processes and pollutants in the water are removed. The dynamic circulation of groundwater in the restoration area is formed through extraction and injection, the washing of the aquifer is strengthened, the restoration efficiency is improved, and the migration of pollution feather is controlled.
Drawings
FIG. 1 is a schematic structural diagram of an in-situ multistage circulating remediation system for halogenated hydrocarbons in groundwater.
FIG. 2 is a schematic plan view of an in situ multi-stage cyclic remediation system for groundwater halogenated hydrocarbons in accordance with an embodiment of the present invention.
The following are labeled as illustrated in the drawings:
the system comprises a reaction well 1, a first-stage reaction filler 2, an injection reaction well 3, a second-stage reaction filler 4, a monitoring well 5, an online data collecting device 6, an online monitoring probe 7, a medicament barrel 8, a dosing metering pump 9, a valve 10, a water conveying pipeline 11, a submersible pump 12 and an injection start-stop controller 13.
Detailed Description
The underground water halogenated hydrocarbon in-situ multistage circulating remediation system is characterized in that an underground water pumping reaction well is arranged inside a pollution plume boundary, reaction fillers are filled between a well wall and a hole wall, and underground water flows through the fillers in the pumping process to perform primary pretreatment reaction. And arranging an injection reaction well in the polluted feather, filling zero-valent iron and activated carbon reaction filler between the well wall and the hole wall, and performing secondary reaction on the filler in the groundwater reinjection process to remove halogenated hydrocarbon pollutants.
The pumped polluted underground water directly enters the reinjection reaction well through a pipeline, is not exposed in the environment, and reduces the risk of secondary pollution. And automatic start-stop control units are installed in the pumping reaction well and the injection reaction well, and the system is automatically controlled to operate according to the water level in the well.
The auxiliary dosing unit consists of a medicament tank, a metering pump, a conveying pipeline, a valve and the like, wherein the medicament conveying pipeline is connected with the underground water reinjection pipeline and is used for dosing and mixing through a pipeline. Biological agents can be added in the groundwater reinjection process to enhance the biodegradation of pollutants; or adding a surfactant to increase the fluidity of the pollutants and enhance the extraction efficiency; or adding a regeneration agent when the filler is inactivated and the disposal efficiency is reduced, and recovering the reaction activity of the filler.
Monitoring wells are arranged inside and outside the pollution range, and the pollution concentration and the change trend of the underground water are sampled and monitored at regular intervals; and an online monitoring probe is placed in the monitoring well, so that data can be transmitted back in real time, and the water quality and the water level change in the repair area can be monitored.
The invention is described in detail below with reference to the figures and examples.
Please refer to fig. 1. The invention provides an in-situ multi-stage circulating repair system for halogenated hydrocarbons in underground water, which has the following specific scheme:
(1) and (3) measuring a drill hole in the boundary of the pollution plume, placing the pumping reaction well 1, wherein the well depth needs to fully cover the pollution plume in the vertical direction, and the diameter of the drill hole is not less than three times of the diameter of the well pipe of the pumping reaction well 1. The pollution depth is less than 7m, and HDPE (high-density polyethylene) pipes are preferably selected as well building pipes; if the diameter is larger than 7m, the well is preferably constructed by rigid materials such as cast iron, stainless steel or cement.
(2) The primary reaction filler 2 is filled between the outer side of the well wall of the pumping reaction well and the wall of a drill hole, the reaction filler can be manganese sand, zeolite and other materials and is used for removing components which influence the secondary reaction, such as iron, manganese, hardness, suspended matters and the like in underground water, and the particle size of the primary reaction filler 2 is preferably 2-4 mm.
(3) Drilling holes in the pollution feather, placing the injection reaction well 3, wherein the well depth needs to cover the pollution feather completely in the vertical direction, and the diameter of the drilled holes is not less than four times of the diameter of a well pipe of the pumping reaction well 3. The pollution depth is less than 7m, and HDPE (high-density polyethylene) pipes are preferably selected as well building pipes; if the diameter is larger than 7m, the well is preferably constructed by rigid materials such as cast iron, stainless steel or cement.
(4) And filling a secondary reaction filler 4 between the outer side of the wall of the injection reaction well and the wall of the drill hole, wherein the reaction filler is a mixed filler of zero-valent iron, activated carbon and quartz sand which are prepared in a certain proportion and is used for removing halogenated hydrocarbon pollutants in the underground water. The mass ratio of the filled zero-valent iron is 20-50%, the specific proportion of the secondary reaction filler 4 is determined according to pollution condition tests, and the particle size is preferably 4-10 mm.
(5) A submersible pump 12 is arranged in the pumping reaction well 1, and pumped underground water is injected back to the ground through the injection reaction well 3 through a water conveying pipeline 11. The pumping reaction well 1 and the injection reaction well 3 are respectively provided with a pumping injection start-stop controller 13, and the start-stop operation of the submersible pump 12 can be controlled according to the water level change in the well hole.
(6) Underground water monitoring wells 5 are uniformly arranged in the pollution feather, and online monitoring probes 7 are placed in the wells, so that the indexes of underground water temperature, water level, pH, ORP, dissolved oxygen, conductivity and the like can be monitored in real time and collected and transmitted back through an online data collecting device 6.
(7) An auxiliary dosing unit is arranged at the accessory of the injection reaction well 3, the auxiliary dosing unit consists of a medicament barrel 8, a dosing metering pump 9 and a valve 10, and the medicament is directly injected into a water pipeline 11 and is injected underground through the injection reaction well.
Example one repair of a land contaminated with chlorinated hydrocarbons by the Process of the invention
The land parcel is located in a chemical plant in east China, and the main pollutants in underground water are 1, 1-dichloroethane, 1, 2-dichloroethane, 1, 1-dichloroethylene, 1,1, 1-trichloroethane, 1,1, 2-trichloroethane, trichloroethylene and tetrachloroethylene. The depth of groundwater pollution is 3-9m, the aquifer medium is mainly soil-containing silt, and the groundwater remediation area is 5332m2. The process system is adopted for repairing, the land is divided into three repairing areas, 14 pumping reaction wells, 9 injection reaction wells, 10 underground water monitoring wells and three sets of auxiliary chemical feeding systems are arranged, and the plane layout is shown in figure 2.
The diameter of the reaction well is 200mm, the diameter of the drilled hole is 600mm, manganese sand is filled,Taking zeolite as a first-order reaction material, wherein the mass ratio is 2: 1; injecting the mixture into a reaction well with the diameter of 300mm and the diameter of a drilled hole of 1200mm, and filling zero-valent iron, activated carbon and melon seeds as secondary reaction fillers in a mass ratio of 4:1: 5; a 3% lactic acid solution was added monthly into the injection well by an auxiliary dosing device. The treatment process circularly treats the underground water by about 200m per day3After 10 months of continuous operation, the underground water with about 6 times pore volume is circularly treated, a good biological reduction dechlorination reaction zone is formed in the aquifer, and the removal rate of pollutants in the underground water exceeds 98 percent.
Example II remediation of a land contaminated with an organic solvent by the Process of the invention
The land is originally an organic solvent warehouse of a certain factory in the northeast, and soil and underground water are polluted by pollutants such as trichloroethylene, tetrachloroethylene and the like due to leakage. The pollution depth of the underground water is 2-4.5m, the stratum of the polluted area is backfill soil, the water permeability is good, and the area of the polluted area is 680m2. The process is adopted to treat the underground water, 3 extraction reaction wells and 3 injection reaction wells are arranged in the land parcel, ion exchange resin is filled outside the extracted reaction wells to reduce the ion concentration of the underground water, zero-valent iron and activated carbon are filled outside the injected reaction wells, the mass ratio is 8:2, and the underground water is circularly treated by 60m each day3After running for 40 days, the removal rate of the chlorinated hydrocarbon in the underground water reaches 95 percent.
Claims (7)
1. An in situ multi-stage cyclic remediation system for a halogenated hydrocarbon in groundwater, comprising:
a plurality of extraction reaction wells are distributed at the inner edge of the pollution plume, a plurality of injection reaction wells are distributed inside the pollution plume, an auxiliary reagent adding unit is arranged between the injection reaction wells, and a plurality of monitoring wells are uniformly distributed in the pollution range;
a first-stage reaction filler is filled between the well wall of the pumped reaction well and the wall of the well hole and is used for reducing the hardness of underground water and removing metal ions in the water;
a submersible pump is arranged in the pumping reaction well and is connected with and injected into the reaction well through a water delivery pipeline;
filling a secondary reaction filler between the well wall of the injection reaction well and the well wall of the well hole to remove halogenated hydrocarbon pollutants in the underground water;
the well mouth of the pumping reaction well and the well mouth of the injection reaction well are both provided with pumping injection start-stop controllers;
the pumping reaction well and the injection reaction well are provided with sieve pores at all sections and are fully covered with pollution feathers in the vertical direction;
the medicament barrel in the auxiliary medicament adding unit is connected to a water pipeline through a dosing metering pump and a valve;
an online monitoring probe is arranged in the monitoring well and is connected with an online data device.
2. An in-situ multi-stage circulating remediation system for halogenated hydrocarbons in underground water as claimed in claim 1, wherein the primary reaction filler filled between the well wall of the pumping reaction well and the well wall of the well hole is manganese sand and/or zeolite, and the particle size of the primary reaction filler is 2-4 mm.
3. An in-situ multi-stage circulating remediation system for halogenated hydrocarbons in underground water as claimed in claim 1, wherein the secondary reaction filler filled between the well wall of the injection reaction well and the well wall of the well hole is a mixed filler of zero-valent iron, activated carbon and quartz sand, the particle size is 4-10mm, and the mass ratio of the filled zero-valent iron is 20-50%.
4. An in situ multi-stage circulation remediation system of claim 1 wherein the auxiliary agent addition unit adds biological agents, surfactants, and/or filler activating agents to the groundwater via pipeline mixing.
5. An in situ multi-stage cyclic remediation system of claim 1 wherein the extraction reaction well bore diameter is no less than 3 times the well pipe diameter of the extraction reaction well.
6. An in situ multi-stage cyclic remediation system of claim 1 wherein the injection reaction well bore diameter is no less than 4 times the well pipe diameter of the injection reaction well.
7. The method for repairing sewage by using the underground water halogenated hydrocarbon in-situ multistage circulation repairing system as claimed in claim 1 comprises the following steps:
the hardness of the underground water pumped by a submersible pump in the pumping reaction well is reduced by a first-stage reaction filler, metal ions and suspended matters in the water are removed, the underground water enters the pumping reaction well through a water conveying pipeline and is reinjected underground, and halogenated hydrocarbon pollutants in the underground water are removed by a second-stage reaction filler;
an online monitoring probe in the monitoring well monitors the water temperature, water level, pH, ORP, dissolved oxygen and conductivity of underground water in real time, and collects and transmits back the underground water through an online data collecting device;
the medicament of the medicament barrel is injected into the ground from the injection reaction well through a dosing metering pump and a valve through a water delivery pipeline;
the pumping injection start-stop controller controls the start-stop operation of the submersible pump according to the water level change in the well hole.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946029A (en) * | 2021-03-10 | 2021-06-11 | 浙江大学 | System and method for delineating pollution plume using borehole groundwater solubility total solids profile |
| CN114029324A (en) * | 2021-11-08 | 2022-02-11 | 核工业北京化工冶金研究院 | Method for repairing local suction injection of fixed ring layer |
| CN114152723A (en) * | 2021-12-01 | 2022-03-08 | 江苏省环境科学研究院 | Pre-installed underground water intelligent monitoring well device |
| CN115321644A (en) * | 2022-08-29 | 2022-11-11 | 上海环境保护有限公司 | Electrically enhanced circulating well system and method for treating halogenated hydrocarbons in underground water by using same |
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Application publication date: 20201127 |