CN213506439U - Simulation restoration device for underground water containing 1,2-dichloroethane - Google Patents
Simulation restoration device for underground water containing 1,2-dichloroethane Download PDFInfo
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Abstract
The utility model provides a simulation restoration device for 1, 2-dichloroethane-containing underground water, which is characterized in that a rectangular box-type shell with an open top is sequentially divided into a pollution source section, a pollutant migration and conversion section and a pollutant restoration section from left to right; the sample space layers of the pollution source section and the pollutant migration and conversion section are soil sample filling layers, and the sample space layers of the pollutant remediation section are a pyrite filling layer, an oxide filling layer and a tourmaline filling layer from left to right in sequence. The utility model discloses a pyrite catalysis persulfate to introduce natural material tourmaline and participated in the fenton-like reaction, optimized the pH value and the redox potential of aquifer, wholly improved the remediation environment of persulfate to 1,2-dichloroethane in the groundwater, obviously promoted validity and the practicality of normal position chemical oxidation device in difficult degradation organic pollution groundwater restoration.
Description
Technical Field
The utility model relates to a pollute groundwater processing technology field, specifically speaking relate to a simulation prosthetic devices that contains 1,2-dichloroethane groundwater.
Background
Volatile chlorinated hydrocarbon Compounds (CAHs) are artificially synthesized organic matters with special odor, and the substances have strong toxic and harmful effects on organs of a human body, such as liver, kidney, cardiovascular system, stomach and intestine, and the like. Chlorinated hydrocarbons are often used as solvents in industrial processes or as intermediates in chemical processes, and are often detected in the environment due to leakage and improper disposal. Among the 129 priority pollutants (priority pollutants) in the united states and the 58 environmentally preferred organisms monitored and controlled in china, 1,2-dichloroethane is located in the front row.
1,2-Dichloroethane (1,2-Dichloroethane) is a volatile highly toxic chlorinated hydrocarbon organic matter and is one of the most toxic pollutants containing chlorine in groundwater of aquifer. Its annual yield exceeds 5.443X 109kg, the most productive industrial halide in the world, has relatively high water solubility (8524mg/L) and potential mobility in soil, so 1,2-dichloroethane has been detected in groundwater early. Due to wide use and improper disposal, 1,2-dichloroethane is a common organic pollutant in soil and groundwater environments, one of the pollutants is preferentially controlled in water in China, the international center for research on cancer classifies the pollutant as a carcinogen in group B2, and the maximum allowable concentration in drinking water is 5 mug/L according to the American EPA. 1,2-dichloroethane is denser than water and once in groundwater it exists as a heavy non-aqueous liquid (DNAPL), and as groundwater often moves slowly, the residual time of 1,2-dichloroethane can last from years to hundreds of years, potentially leading to continued environmental and health risks. Therefore, the research on the remediation of the 1,2-dichloroethane polluted underground water has important practical significance for optimizing the development and living environment of the human societyAnd (5) defining.
A large number of scholars at home and abroad develop a large amount of research work aiming at the 1, 2-dichloroethane-polluted underground water by means of various restoration technologies. In 1,2-dichloroethane contaminated site treatment measures published by the U.S. EPA since 1985 and 2002, 46 contaminated sites apply extraction-treatment technology and are matched with air stripping and activated carbon adsorption methods for treating and extracting underground water, but the method for completely removing organic pollution of underground water has the disadvantages of high difficulty, long time consumption, high cost and little DNAPL treatment effect. Some students adopt microorganisms to repair 1,2-dichloroethane polluted fields, but the microbial degradation is influenced by more factors, such as temperature, pH, redox conditions, nutritional conditions and the like, and is difficult to artificially regulate, long in time consumption and slow in effect, so that the method also belongs to pollution treatment means needing to be further researched. The researchers also used in-situ chemical oxidation method to inject oxidant, commonly used oxidant is potassium permanganate (KMnO), into the 1,2-dichloroethane contaminated source region4) Ozone (O)3) Hydrogen peroxide (H)2O2) Sodium persulfate (Na)2S2O8) And the like, although the in-situ chemical oxidation method has high treatment efficiency, short time and convenient and quick actual operation, and can effectively convert various organic pollutants such as chlorohydrocarbon and the like into nontoxic inorganic substances, the traditional in-situ chemical oxidation method has many defects: (1) KMnO4The treated water will increase the color of the water; (2) na (Na)2S2O8The groundwater remediation can generate a large amount of SO4 2-Small amount of SO4 2-Has no influence on human health, but has laxative effect on human body when its concentration exceeds 250mg/L, and in addition, Na alone2S2O8The application effect is not ideal; (3) the pH requirement of the reaction system is high. Meanwhile, the related scholars have less research on removing 1,2-dichloroethane pollution in groundwater, and have not developed an oxidant capable of efficiently removing 1,2-dichloroethane by oxidation. Aiming at the problems of low attention degree to the pollution problem of the 1,2-dichloroethane and incomplete related treatment measure system at present, a chemical oxidation repair method and a chemical oxidation repair system for stably removing the 1,2-dichloroethane polluted groundwater for a long time and with high efficiency are further exploredAnd (5) resetting the device.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a simulation prosthetic devices who contains 1,2-dichloroethane groundwater to it is unsatisfactory to solve current prosthetic devices application effect, and device operating stability is poor, requires higher scheduling problem to reaction system pH.
The utility model adopts the technical proposal that: a simulation restoration device for underground water containing 1,2-dichloroethane divides a rectangular box-type shell with an open top into a pollution source section, a pollutant migration and conversion section and a pollutant restoration section from left to right in sequence;
a plurality of vertical concave clamping grooves are uniformly formed in the inner sides of the front wall plate and the rear wall plate of the box-type shell, the lower edges of the clamping grooves are in contact with the bottom plate of the box-type shell, and the upper edges of the clamping grooves are flush with the upper opening of the box-type shell; a rectangular porous water distribution plate is inserted between the two clamping grooves in opposite positions on the front wall plate and the rear wall plate of the box-type shell, overflowing holes are densely distributed on the surface of the porous water distribution plate, the lower edge of the porous water distribution plate is in contact with the bottom plate of the box-type shell, and the upper edge of the porous water distribution plate is parallel to the upper opening of the box-type shell; the porous water distribution plate divides the inner cavity of the box-type shell into a plurality of sample space layers; the upper opening of the box-type shell is provided with a sealing cover which can be lifted or buckled;
the left wall plate of the box-type shell is connected with a plurality of water inlets which are arranged in a layered mode, and the right wall plate of the box-type shell is connected with a plurality of water outlets which are arranged in a layered mode; the sample space layers close to the left wall plate form the pollution source section, the sample space layers close to the right wall plate form the pollutant repairing section, the sample space layers between the pollution source section and the pollutant repairing section form the pollutant migration and conversion section, and the pollution source section, the pollutant migration and conversion section and the pollutant repairing section are adjacent or separated by the sample space layers; the sample space layers of the pollution source section and the pollutant migration and conversion section are soil sample filling layers, and the sample space layers of the pollutant remediation section are a pyrite filling layer filled with a mixture of pyrite and quartz sand, an oxide filling layer filled with a mixture of persulfate and quartz sand and a tourmaline filling layer filled with a mixture of tourmaline and quartz sand in sequence from left to right;
the top of a box-type shell corresponding to a pollution source section is provided with a pollution source device for bearing 1,2-dichloroethane, a simulated deluge device is arranged above the pollution source device, the simulated deluge device comprises a water supply main pipe, a water distribution pipe, a coiled pipe and a spray pipe, and double water drain holes are axially formed in the spray pipe; the spray pipes are divided into a plurality of groups, the spray pipes are horizontally arranged above the pollution source section, each group of spray pipes is connected to the lower ends of the water distribution pipes through the coiled pipes, the upper ends of the water distribution pipes of each group are connected to the water supply main pipe in a common mode, and each water distribution pipe is provided with a rain control valve; the water supply main pipe is supplied with water by a water pump or a tap water pipe.
The box-type shell is arranged on a chassis, and the bottom surface of the chassis is connected with a plurality of trundles; the drainage and sludge discharge device is characterized in that a drainage and sludge discharge device is arranged on a bottom plate of the box-type shell, a plurality of drainage and sludge discharge holes are formed in the bottom plate of the box-type shell, a drainage and sludge discharge pipe is connected to a bottom opening of each drainage and sludge discharge hole, a drainage and sludge discharge control valve is connected to each drainage and sludge discharge pipe, and the lower ends of all the drainage and sludge discharge pipes are connected to a transverse drainage and sludge discharge main pipe.
A plurality of sampling ports which are arranged in a layered mode are uniformly arranged on the front wall plate and the rear wall plate of the box-type shell respectively, and the sampling ports are distributed on the front wall plate and the rear wall plate which correspond to each sample space layer separated by the porous water distribution plate; two ends of the front wall plate and the rear wall plate of the box-type shell are respectively provided with a row of overflow ports which are longitudinally arranged; and a plurality of vertical monitoring/dosing hole pipes are respectively inserted into each sample space layer separated by the porous water distribution plate in the box-type shell.
The utility model discloses an advantage and beneficial effect do:
1. the utility model provides a get rid of prosthetic devices of 1,2-dichloroethane in groundwater, rely on the fenton system of pyrite activation type to carry out degradation reaction to 1,2-dichloroethane at first, unite the operational environment of tourmaline optimization type fenton reaction unit again, reached and thoroughly oxidized the getting rid of 1,2-dichloroethane, and realized the purpose of repairing the optimization of flow;
2. the utility model relies on the Fe released by pyrite in water environment2+Activating persulfates to stabilize the release of strongly oxidizing SO4 -By using SO4 -Completely oxidize the 1,2-dichloroethane, hardly generate dechlorination products with stronger toxicity in the middle, and effectively improve the removal rate of the 1,2-dichloroethane in a groundwater pollution source region; through the test of the embodiment, the removal rate of the 1,2-dichloroethane is 92% -100%, dechlorination products with stronger toxicity are not generated in the reaction process, the secondary pollution is small, the risk of the ecological environment is small, the safety is high, the operation is simple, and the technology and the environmental protection have obvious advantages;
3. can generate H in situ when the pyrite is put into water2O2And Fe released into water body together with pyrite2+Form a Fenton-like system to generate OH, Fe when persulfate is added to the system2+Can activate persulfate SO as to generate a large amount of SO4-·，SO4-The active substances generated in situ with the pyrite act on pollutants together, so that the aim of efficiently oxidizing the pollutants is fulfilled;
4、Fe2+can activate persulfate to stably generate sulfate radical (SO 4) with strong oxidizing property-H) with redox potential of 2.5-3.1V, higher than hydroxyl radical (OH) under neutral or alkaline conditions (1.9-2.0V), similar to OH (2.4-2.7V) under acidic conditions;
5. the utility model is Fe2+The system mainly comes from pyrite, a plurality of mines are abandoned as tailings after being mined, and the pyrite is easy to generate acid mine wastewater under the rainwater leaching condition, so that the pyrite has rich sources and low price, and simultaneously, the system utilizes the abandoned natural ore as a resource, thereby playing multiple effects of resource recovery and pollution avoidance;
6. the utility model discloses a pH value of water environment is adjusted to iron tourmaline, because this specific properties's iron tourmaline has pyroelectricity and piezoelectricity, has permanent electrode itself, can release the anion automatically, permanently, the anion has stronger oxidability, can break carbon hydrogen bond, and can mildly adjust liquid pH value to neutral, thereby can maintain reaction system pH stable in 1,2-dichloroethane degradation process, so do not need additionally to add pH buffer in the device operation process, avoid producing secondary pollution; because the tourmaline has a permanent electrode, the efficacy of adjusting the pH value and the oxidation-reduction potential can be theoretically exerted for a long time;
7. the tourmaline has permanent electrode to induce non-uniform magnetic field around the tourmaline, which enhances the dissolution of iron ore, and the magnetic field is easy to induce paramagnetic Fe near the tourmaline due to Lorentz force2+The convection transfer of the method can effectively strengthen the activation effect of the pyrite and persulfate system and the surface corrosion of the pyrite under the condition of an external weak magnetic field, and the related magnetic field is environment-friendly;
8. when the utility model removes 1,2-dichloroethane in water, the reactor is scientifically divided into three series steps according to the degradation and removal requirements of pollution components contained in polluted underground water, 1,2-dichloroethane in water environment can be effectively removed, the simple and high-efficiency process flow is realized, and the purpose of reducing the operation cost is achieved;
9. the utility model directly utilizes natural minerals, saves the complicated preparation and addition links of catalyst and environment restoration regulator, so the operation of the technical process is simple, and a treatment method with low cost, simple operation, effective operation and environmental protection can be provided for the restoration of the 1,2-dichloroethane polluted underground water;
10. the utility model does not need heating, aeration, ultraviolet irradiation, electrification and the like, and does not need to add active materials such as transition metal ions, hydrogen peroxide and the like, and related reaction systems can be carried out at normal temperature and normal pressure, and the system has simple operating conditions, mild reaction conditions, simple operation and control and low operation and maintenance cost; the method can obviously reduce the technical requirements of the prior in-situ treatment process, further reduce the construction and operation costs in a large proportion, is easy for engineering application, can be applied to the in-situ chemical remediation of underground water, particularly deep underground water pollutants, the treatment of emergent pollution accidents and the like, and has wide application range;
11. the method can be efficiently applied to the permeable reactive barrier device, scientifically adjusts the filling material according to the required conditions for degrading and removing the pollution components contained in the polluted underground water, reasonably builds a repairing environment suitable for removing the related pollution components in the polluted underground water, and is beneficial to carrying out comprehensive treatment on the difficultly degraded polluted underground water like 1,2-dichloroethane, thereby achieving the purpose of integrally repairing and optimizing the polluted underground water; due to the scientific and reasonable combination of the method, the permeable reactive barrier is expected to solve a plurality of problems existing in the technical field of permeable reactive barriers utilizing the in-situ chemical restoration process at present, so that the utility model is beneficial to carrying out comprehensive restoration on refractory composite pollution targets and has wide application prospect.
12. The utility model discloses can realize all-round hydrodynamic field, the simulation of water chemistry field is reappeared, can be used to the discussion of quality of water evolution mechanism, can be used to the migration conversion simulation experiment of pollutant in the aquifer under the different redox environmental conditions and study the rainfall simulation experiment to the drenching and dripping of pollutant in the aeration zone, through the migration process of the observation medicine that on-line monitoring device can be clear in aeration zone soil and aquifer, be convenient for deep analysis solute migration and migration conversion law of medicine in aeration zone soil and aquifer under the different redox environmental conditions.
13. The utility model provides high simulation experiment's fidelity has reduced simulation experiment's cost, provides a reliable experimental basis for the research experiment of repair techniques such as the normal position aeration technique of groundwater, normal position chemical oxidation technique, normal position bioremediation technique, permeable reaction wall technology, has enlarged analogue means's universality.
To sum up, the utility model discloses to current normal position chemical oxidation device operating stability is poor, the technological reaction condition requirement is harsh, the equipment operation degree of difficulty is big, repair effect is poor, the short scheduling problem of service life, innovatively adopt the source abundant, low price, chemical stability is good, it is nontoxic harmless, pure natural pyrite catalysis persulfate, and introduce natural material tourmaline and participate in the fenton-like reaction, the pH value and the redox potential of aquifer have been optimized, persulfate is to 1 in the groundwater to whole having improved, the prosthetic environment of 2-dichloroethane, validity and the practicality in difficult degradation organic pollution groundwater is restoreed to normal position chemical oxidation technique have obviously been promoted.
Drawings
Fig. 1 is a schematic structural view of the repairing device of the present invention.
Fig. 2 is a schematic top plan view of functional segments of the prosthetic device of the present invention.
Fig. 3 is a schematic structural view of the filling material filling in the repairing device of the present invention.
Fig. 4 is a schematic diagram of a drainage and sludge discharge structure in the repairing device of the present invention.
Fig. 5 is a schematic structural view of a mobile platform in the repairing device of the present invention.
Fig. 6 is a schematic top view of the box-type casing in the repairing device of the present invention.
Fig. 7 is a plan view of the shower pipes in the repairing device of the present invention.
Wherein, 1, a pyrite filling layer, 2, an oxide filling layer, 3, a tourmaline filling layer, 4, a pyrite filling material, 5, an oxide filling material, 6, a tourmaline filling material, 7, a pollution source device, 8, a pollution leakage zone, 9, a pollution feather, 10, a ground, 11, an aeration zone, 12, a ground water liquid level, 13, a ground water flow direction, 14, a saturated water zone, 15, a water-resisting layer upper boundary, 16, a dosing pipe orifice, 17, a shell type box body, 18, a water inlet, 19, an overflow orifice, 20, a sampling port, 21, a water outlet, 22, a clamping groove, 23, a chassis, 24, a drainage and sludge discharge pipe, 25, a drainage and sludge discharge control valve, 26, a caster, 27, a lifting rack, 28, a drainage and sludge discharge main pipe, 29, a dosing/monitoring hole pipe, 30, a drainage and sludge discharge hole, 31, a porous water distribution plate, 32, a pollution source section, 33, a pollutant migration and conversion section, 34, the pollutant repairing section comprises a pollutant repairing section 35, a spraying pipe 36, a deluge control valve 37, a coiled pipe 38, a water supply main pipe 39 and a water distribution pipe.
Detailed Description
The present invention is further illustrated by the following examples, which are given by way of illustration only and are not to be construed as limiting the invention in any way.
1,2-Dichloroethane (1,2-Dichloroethane) is a colorless transparent oily liquid, has a chloroform-like smell, and is a common volatile chlorinated organic pollutant with a simpler structure in underground water; 1,2-dichloroethane had a density of 1.253g/mL, a relative vapor density (air ═ 1) of 3.35, a solubility of 8.7g/L, a boiling point of 83.5 ℃ and a vapor pressure of 12mmHg (25 ℃); slightly soluble in water, and miscible with ethanol, chloroform and diethyl ether. 1,2-dichloroethane has good physicochemical properties and is widely applied in the industrial field, the agricultural field and the living field, so that the 1,2-dichloroethane is a common volatile highly toxic chlorinated hydrocarbon organic matter in groundwater and is one of pollutants represented by DNAPL.
Pyrite, pyrrhotite, marcasite, having the molecular formula FeS2And the molecular weight is 120. The most common crystals of pyrite are hexagonal, octahedral, and pentadodecahedral, and have a yellowish metallic luster. Specific gravity of 4.95-5.20 and hardness of 6.0-6.5.
Tourmaline, tourmaline and tourmaline is a kind of annular silicate mineral, and its structural general formula can be represented as XY3Z6Si6O18(BO3)3W4Wherein X is Na+、Ca2+、K+A vacancy, Y ═ Mg2+、Fe2+、Mn2+、AI3+、Fe3+、Mn3+、Li+，Z＝AI3+、Fe3+、Cr3+、Mg2+，W＝OH-、F-、O2-Wherein the physical properties of the tourmaline are influenced by different types of atoms or ions at the three positions of X, Y and Z; the structure is in a trigonal/hexagonal crystal system, and the crystal habit is as follows: the assembly is in a radial shape, a bundle shape and a rod shape; glass is glossy, transparent to opaque, the hardness is 7.0-7.5, the specific gravity is 3.0-3.2, and the refractive index is 1.62-1.64; birefringence: 0.018-0.040, usually 0.020。
As shown in fig. 1 to 3, the main body of the prosthetic device of the present invention is a rectangular box-shaped shell 17 with an open top, and its length, width, and height are 2400, 600, 1200 mm. A plurality of vertical concave clamping grooves 22 are uniformly arranged on the inner sides of the front wall plate and the rear wall plate of the box-type shell 17, the lower edges of the clamping grooves 22 are contacted with the bottom plate of the box-type shell 17, and the upper edges of the clamping grooves 22 are flush with the upper opening of the box-type shell 17. A rectangular porous water distribution plate 31 is inserted between the two clamping grooves 22 at opposite positions on the front wall plate and the rear wall plate of the box-type shell 17, the plate surface of the porous water distribution plate 31 is densely provided with overflowing holes, the lower edge of the porous water distribution plate 31 is contacted with the bottom plate of the box-type shell 17, and the upper edge of the porous water distribution plate 31 is level with the upper opening of the box-type shell 17; the perforated water distribution plate 31 divides the inner cavity of the box-like housing 17 into several sample space layers. A sealing cover which can be lifted or buckled is arranged at the upper opening of the box-type shell 17.
The left wall plate of the box-type shell 17 is connected with a plurality of water inlets 18 which are arranged in a layered manner, and the right wall plate of the box-type shell 17 is connected with a plurality of water outlets 21 which are arranged in a layered manner; the left and right walls of the box housing 17 and the perforated water distribution plate 31 in the box housing 17 are all perpendicular to the flow direction 13 of the groundwater in the saturated zone.
The plurality of sample space layers adjacent to the left wall panel form the contamination source section 32, the plurality of sample space layers adjacent to the right wall panel form the contamination remediation section 34, the plurality of sample space layers between the contamination source section 32 and the contamination remediation section 34 form the contamination transfer section 33, and the contamination source section 32, the contamination transfer section 33, and the contamination remediation section 34 are adjacent to or separated by the sample space layers; the sample space layers of the pollution source section 32 and the pollutant migration and conversion section 33 are soil sample filling layers, and the sample space layers of the pollutant remediation section 34 are a pyrite filling layer 1 filled with a mixture of pyrite and quartz sand, an oxide filling layer 2 filled with a mixture of persulfate and quartz sand, and a tourmaline filling layer 3 filled with a mixture of tourmaline and quartz sand in sequence from left to right;
the effective length of the pyrite filling layer 1 is 300mm, and the pyrite and the quartz sand (according to the volume ratio) are respectively 40% and 60%; the effective length of the oxide filling layer 2 is 300mm, the persulfate and the quartz sand (according to the volume ratio) are respectively 15% and 85%, the persulfate is potassium persulfate and sodium persulfate, the mass ratio of the potassium persulfate to the sodium persulfate is 1: 9, and the purity of the persulfate is more than or equal to 98 wt%; the effective length of the tourmaline filling layer 3 is 300mm, and the tourmaline and the quartz sand (according to the volume ratio) are respectively 30 percent and 70 percent.
The pyrite is industrial-grade pyrite with the particle size of 0.5-5 mu m; the tourmaline is an industrial grade iron tourmaline with the grain diameter of 0.5-5 μm. The method is characterized in that the pyrite and the tourmaline raw materials are pretreated before being filled, and the pretreatment process comprises the following steps: firstly, cleaning a single reaction material by using tap water, then placing the reaction material in a muffle furnace, baking the reaction material for 12 hours at the temperature of 60 ℃, taking the reaction material out of the furnace after drying, and then sieving the reaction material by using a soil vibrator and a soil sieve for later use; according to the requirements of the polluted groundwater remediation test, different reaction materials can be uniformly mixed by a soil vibrator according to the proportion determined by the test requirements for standby.
The height of the fillers in the pyrite filling layer 1, the oxide filling layer 2 and the tourmaline filling layer 3 of the pollutant repairing section 34 is 50-300 mm lower than the upper opening of the box-type shell, soil samples cover the pyrite filling layer 1, the oxide filling layer 2 and the tourmaline filling layer 3 of the pollutant repairing section 34, and the soil samples of the pollution source section 32, the pollutant migration and conversion section 33 and the pollutant repairing section 34 are all field in-situ soil samples. After the soil sample is subjected to earlier stage treatment, uniformly filling the soil sample into designated spaces at two ends and in the middle of the device layer by layer; the thickness of the same layer of reaction material filled in each space is basically the same, and the total filling height of the final soil sample and the reaction material is 50mm lower than that of the upper opening of the box-type shell.
As shown in fig. 1 and 7, a pollution source device 7 containing 1,2-dichloroethane is provided on the top of the box-type casing corresponding to the pollution source section 32, and a simulated deluge device including a water supply main pipe 38, a water distribution pipe 39, a coiled pipe 37, a shower pipe 35, and the like is provided above the pollution source device 7. Double drainage holes are axially formed on the spray pipe 35; the spray pipes 35 are divided into a plurality of groups, the spray pipes 35 are horizontally arranged above the pollution source section, each group of spray pipes is connected to the lower ends of water distribution pipes 39 through coiled pipes 37, the upper ends of the water distribution pipes 39 of each group are connected to a water supply main pipe 38 in common, and each water distribution pipe 39 is provided with a rain control valve 36; the water supply manifold 38 is supplied with water by a water pump or a tap water pipe, and the rainfall simulation is formed by regulating the rain control valve 36. The water supply main pipe 38 is provided with a dosing nozzle 16 (figure 1) which is provided with a plug for dosing when necessary. The simulation drenching device accessible crane hoist and mount in the top of box casing 17, through the regulation of crane, makes shower 35 apart from the height of box casing 17 top surface between 100 ~ 500mm, still can carry out the translation about according to the experiment requirement simultaneously, and translation distance can be about 400 mm. The rain simulating device is used for simulating rainfall in natural environment and can simulate rainfall states in various natural environments such as light rain, medium rain, heavy rain and the like.
Referring to fig. 4 and 5, the box-type housing 17 is mounted on a base plate 23, and casters 26 are attached to the bottom surface of the base plate 23. The right end of the chassis 23 is connected with a folding rectangular lifting frame 27, a water tank with adjustable height is arranged on the lifting frame 27, and the water tank is connected to the water outlet 21 at the right end of the box-type shell 17 through a communicating pipeline. An electromagnetic valve and a flowmeter are arranged on the communicating pipeline, and a data line on the flowmeter is connected to a central control computer.
The water and mud discharging device is characterized in that a plurality of water and mud discharging holes 30 are formed in the bottom plate of a box type shell 17, a water and mud discharging pipe 24 is connected to the bottom opening of each water and mud discharging hole 30, a water and mud discharging control valve 25 is connected to each water and mud discharging pipe 24, and the lower ends of all the water and mud discharging pipes 24 are connected to a transverse water and mud discharging main pipe 28.
As can be seen from fig. 1 and 6, the sampling ports 20 are respectively disposed on the front wall plate and the rear wall plate of the box-type housing 17 in a layered manner, and the sampling ports 20 are distributed on the front wall plate and the rear wall plate corresponding to each sample space separated by the porous water distribution plate 31. A sampler is mounted on each sampling port 20 or a sealing plug is sealed. A row of overflow ports 19 which are longitudinally arranged are respectively arranged at the two ends of the front wall plate and the rear wall plate of the box-type shell 17; the monitoring/medicine adding device is formed by inserting a plurality of vertical monitoring/medicine adding hole pipes 29 into each sample space which is separated by a porous water distribution plate 31 in a box-type shell 17.
The method for applying the simulated restoration device containing 1,2-dichloroethane underground water comprises the following steps:
(a) setting the simulation repairing device; installing a monitoring device according to the requirement, connecting the monitoring device with a central control computer, and utilizing a monitoring platform of the central control computer to automatically acquire various parameters in the water circulation process in real time;
the installation positions of different online monitoring devices are determined according to the requirements of the repair test, the monitoring probes of the online monitoring devices are inserted into the monitoring/dosing hole pipe 29, the insertion depths of the monitoring probes are determined according to the requirements of the set regulation of the repair test, and the data wires of the online monitoring devices are all connected to a central control computer. According to the requirements of set regulations of repair tests, a sampling port 20 is selected on a box-type shell 17 as a sample collection point, or a water inlet 18, a water outlet 21, an overflow port 19 or a drainage and sludge discharge hole 30 is selected for special sample collection, a sealing plug is removed from the selected sampling port, and a sampler is respectively installed on the selected sampling port.
(b) Continuously injecting water from the layered water inlet 18, namely injecting clear water from the lowest layer water inlet of the layered water inlet, and then changing the layered water inlet for water injection from bottom to top every 24 hours, so that the sample material filled in the box-type shell is fully wetted to be saturated, gas in the porous sample is discharged in the whole water saturation process, a simulated aeration zone is formed at the upper part of the box-type shell, and a simulated saturated zone is formed at the middle part and the lower part of the box-type shell;
(c) receiving water level information input by the monitoring device by using a central control computer, and keeping water flow stable when the water level reaches a set value, namely reaching a set water circulation simulation condition; the seepage velocity of the simulated groundwater within the box housing 17 is maintained at 0.25-0.30 m/d. According to the set rainfall intensity and the set rainfall time, a tap water pipe or a water pump is controlled to supply water and pressurize, and various rainfall states of light rain, medium rain, heavy rain or heavy rain in the natural environment are simulated;
(d) 1,2-dichloroethane in the pollution source device enters the box-type shell under the dripping effect of the simulated raining device, and forms pollution plumes at the simulated saturated zone to realize the simulation of a continuous pollution source or a temporary pollution source; in the drug administration process of simulating the pollution source, a central control computer can be used for automatically collecting various parameters in the water circulation process in the pollution source section and the pollutant migration and conversion section in real time so as to obtain change data of migration and conversion of pollutants in underground water, and meanwhile, the flow rate of the simulated underground water and the rainfall capacity of the simulated deluge device can be adjusted according to monitoring data;
(e) after the simulated underground water containing 1,2-dichloroethane enters the pollutant remediation section, the pyrite in the pyrite filling layer can generate H in situ in the water2O2And Fe released into water body together with pyrite2+The formation of a fenton-like system generates OH and starts to oxidize 1, 2-dichloroethane; when simulated underground water carries Fe released by pyrite2+After entering the oxide filling layer, Fe2+Initiation of persulfate activation produces large amounts of SO4-Jointly acting on pollutants with active substances generated in situ by pyrite, and continuously and stably oxidizing the 1,2-dichloroethane in the device, thereby achieving the aim of efficiently oxidizing the 1, 2-dichloroethane; the pH value of simulated underground water is continuously reduced when the simulated underground water passes through a pyrite filling layer and an oxide filling layer, the pH value of a solution can be adjusted by tourmaline in the tourmaline filling layer, so that the pH value of effluent of a reaction system is kept stable, finally, 1,2-dichloroethane in the simulated underground water is removed under the action of a pollutant repairing section, and various parameters in the corresponding reaction process in the pollutant repairing section can be automatically collected in real time by using a central control computer to obtain change data of underground water pollutant degradation; the treated simulated groundwater flows out from a water outlet of the box-type shell;
with reference to fig. 2 and 3, the 1, 2-dichloroethane-containing pollution source device 7 forms leachate under the action of the spray pipe 35, when 1,2-dichloroethane pollutants in the pollution source device 7 leak into the ground, a pollution leakage zone 8 is generated in the aeration zone 11 so as to start to continuously migrate and convert to the periphery, and when the pollution components pass through the aeration zone 11 and enter the saturated zone 14, the pollution components are transversely diffused under the action of the gradient of the underground water flow so as to cause the pollution components to be diffused to form 1,2-dichloroethane pollution plume 9.
Before the 1,2-dichloroethane contaminated plume 9 enters the pyrite filling layer, the pyrite starts to release Fe in the solution2+The dissolved oxygen in the initial solution may be from Fe2+There, an electron is obtained to generate active oxygen, such as H2O2、O2 -And OH, some of the active oxygen being able to volatilize electrons and convert Fe3+Is oxidized into Fe2+The iron cycle is formed by repeatedly generating active substances, and the iron cycle is just because the active substances can promote the iron cycle on the surface of the pyrite, so that a Fenton-like reaction system is stably formed; after the 1,2-dichloroethane contaminated plume 9 enters the pyrite filling layer under the action of natural hydraulic gradient, the oxidation treatment of the 1,2-dichloroethane is started by utilizing the active oxygen in the Fenton-like system.
Before the 1,2-dichloroethane pollution plume 9 enters the oxide filling layer, the persulfate begins to release S in the solution2O8 2-(ii) a The 1,2-dichloroethane pollution plume 9 treated by the pyrite filling layer carries active oxygen and released Fe generated by the reaction of the materials in the pyrite filling layer and the solution2+After entering the oxide filling layer, the material of the oxide filling layer starts to be activated, and the activation reaction is as follows:
S2O8 2-+Fe2+→SO4 -·+SO4 2-+Fe3+
due to Fe in the device2+Promote the oxide filling layer to stably generate free radicals SO4 -The device is ensured to continuously and stably oxidize the 1,2-dichloroethane in the 1,2-dichloroethane pollution plume 9; the persulfate may also be pretreated to stabilize the rate of dissolution of persulfate and to provide prolonged release of S2O8 2-And time is saved, so that the purpose of stably regulating and controlling the Fenton-like conditions of underground water in the oxide filling layer of the device is achieved.
The slow reaction process of the pyrite filling layer and the oxide filling layer material in the solution belongs to an acid production process, and the main acid production process in the solution is as follows: s2O8 2-+H2O→2HSO4 -+1/2O2(ii) a The pH value of underground water in a pyrite filling layer and an oxide filling layer is reduced in the related acid production reaction process, and the pH value of effluent is regulated and controlled by a pH value control method according to the degradation requirement of 1,2-dichloroethane pollution feather 9.
The 1,2-dichloroethane pollution feather 9 enters a tourmaline filling layer, and the pH value of the tourmaline in the solution is adjusted; because the tourmaline has pyroelectricity and piezoelectricity, a permanent electrode exists in the tourmaline, negative ions can be automatically and permanently released, the negative ions have strong oxidability, carbon-hydrogen bonds can be broken, and the pH value of the liquid can be mildly adjusted to be neutral, so that the pH stability of a reaction system can be maintained in the degradation process of the 1, 2-dichloroethane; finally, the 1,2-dichloroethane pollution plume 9 is basically and completely removed from the 1,2-dichloroethane and the intermediate products in the pollution plume under the combined action of the reaction materials.
For confirming validity and stability of this device, the inventor has set up 3 contrast group again when arranging this device experimental, and the contrast group is experimental to be the simple pyrite filling layer restoration of pollutant restoration section experimental, the simple oxide filling layer restoration of pollutant restoration section experimental and the simple tourmaline filling layer restoration of pollutant restoration section experimental respectively, and three contrast experimental functional layer effective length is 900mm, other structures and operation all with the utility model discloses the same.
And (3) repairing test results:
the utility model discloses the back is accomplished in installation and debugging of device and contrast group test device, is used for handling 1,2-dichloroethane and pollutes groundwater, and longest test has lasted 80 days of operation, and table 1 is seen to the relevant operation result.
Table 1:
in Table 1 "-" indicates that no relevant contaminating component was detected in the sample.
Different test settings produce different operating conditions, and the relevant operating conditions of the relevant tests are as follows:
a. the utility model discloses repair experiment: after the repairing test is carried out for 80 days, the repairing device still shows strong removing capability on 1,2-dichloroethane in the polluted underground water, various polluted components in the effluent are obviously removed, especially, the organic matter removing effect is ideal, and the final degradation product of the organic matter is basically CO2And H2O, effluent organics and intermediates thereof are virtually absent.
b. And (3) repairing test of a pyrite filling layer: the test of the control group runs for 80 days, although the effluent shows that the control group has certain removal capacity on organic matters, the pyrite and the quartz sand have no strong oxidation removal capacity on the 1,2-dichloroethane, the oxidation removal capacity of the 1,2-dichloroethane after 4 days is observed in the early static repair experiment and is not thorough, the rest 1,2-dichloroethane and intermediate products are mostly adsorbed in the pyrite or soil, meanwhile, the physical adsorption performance of the pyrite and the soil is further enhanced due to the low designed flow rate of underground water, and the rebound phenomenon of organic pollution of the effluent after the saturation of physical adsorption of the pyrite and the soil can exist in the continuous operation;
c. oxide filling layer repair test: the control group test runs for 80 days, although the effluent shows that the control group has certain removal capacity on organic matters, when persulfate has weaker self-oxidation capacity on 1,2-dichloroethane, the oxidation removal capacity of the control group after 4 days is observed in the early static repair experiment is 8% -15%, the oxidation of the 1,2-dichloroethane is not thorough, the rest 1,2-dichloroethane and intermediate products are mostly adsorbed in the soil, meanwhile, the physical adsorption performance of the soil is further enhanced due to the too low designed flow rate of underground water, and the phenomenon of water pollution rebound possibly existing after the physical adsorption saturation of the soil can be caused by continuous operation.
d. And (3) a tourmaline filling layer repairing test: the control group test runs for 80 days, although the effluent shows that the control group has certain removal capacity on organic matters, the oxidation capacity of the tourmaline on 1,2-dichloroethane is weaker, the oxidation removal capacity of the tourmaline after 4 days is observed to be 18% -30% in the early static repair experiment, the 1,2-dichloroethane is not completely oxidized, most of the rest 1,2-dichloroethane and intermediate products are adsorbed in the soil, the physical adsorption performance of the soil is further enhanced due to the low designed flow rate of underground water, and the phenomenon of water pollution rebound after the soil physical adsorption saturation can exist in the continuous operation.
From the result contrast, discover the utility model discloses the restoration test is obviously more ideal than three contrast group restoration test to the restoration effect of polluting various pollution components in the groundwater, especially on the ability of getting rid of various pollution components in polluting the groundwater with the prosthetic devices steady operation cycle on the performance more outstanding.
Finally, it should be noted that the above only serves to illustrate the technical solution of the present invention and not to limit the application of the technology, and although the present invention is described in detail by following the preferred arrangement scheme, a person skilled in the art should understand and be able to control, and at the same time, the technical solution of the present invention (such as the construction mode of the device, the specific structure and function of each stage, etc.) can be modified or replaced with equivalents without departing from the spirit and scope of the technical solution of the present invention.
Claims (2)
1. A simulation restoration device for underground water containing 1,2-dichloroethane is characterized in that a rectangular box-type shell with an opening at the top is sequentially divided into a pollution source section, a pollutant migration and conversion section and a pollutant restoration section from left to right;
a plurality of vertical concave clamping grooves are uniformly formed in the inner sides of the front wall plate and the rear wall plate of the box-type shell, the lower edges of the clamping grooves are in contact with the bottom plate of the box-type shell, and the upper edges of the clamping grooves are flush with the upper opening of the box-type shell; a rectangular porous water distribution plate is inserted between the two clamping grooves in opposite positions on the front wall plate and the rear wall plate of the box-type shell, overflowing holes are densely distributed on the surface of the porous water distribution plate, the lower edge of the porous water distribution plate is in contact with the bottom plate of the box-type shell, and the upper edge of the porous water distribution plate is parallel to the upper opening of the box-type shell; the porous water distribution plate divides the inner cavity of the box-type shell into a plurality of sample space layers; the upper opening of the box-type shell is provided with a sealing cover which can be lifted or buckled;
the left wall plate of the box-type shell is connected with a plurality of water inlets which are arranged in a layered mode, and the right wall plate of the box-type shell is connected with a plurality of water outlets which are arranged in a layered mode; the sample space layers close to the left wall plate form the pollution source section, the sample space layers close to the right wall plate form the pollutant repairing section, the sample space layers between the pollution source section and the pollutant repairing section form the pollutant migration and conversion section, and the pollution source section, the pollutant migration and conversion section and the pollutant repairing section are adjacent or separated by the sample space layers; the sample space layers of the pollution source section and the pollutant migration and conversion section are soil sample filling layers, and the sample space layers of the pollutant remediation section are a pyrite filling layer, an oxide filling layer and a tourmaline filling layer from left to right in sequence;
a pollution source device for bearing 1,2-dichloroethane is arranged at the top of the box-type shell corresponding to the pollution source section, a simulated deluge device is arranged above the pollution source device, the simulated deluge device comprises a water supply main pipe, a water distribution pipe, a coiled pipe and a spray pipe, and double water drain holes are axially formed in the spray pipe; the spray pipes are divided into a plurality of groups, the spray pipes are horizontally arranged above the pollution source section, each group of spray pipes is connected to the lower ends of the water distribution pipes through the coiled pipes, the upper ends of the water distribution pipes of each group are connected to the water supply main pipe in a common mode, and each water distribution pipe is provided with a rain control valve; the water supply main pipe is supplied with water by a water pump or a tap water pipe;
the box-type shell is arranged on a chassis, and the bottom surface of the chassis is connected with a plurality of trundles; the drainage and sludge discharge device is characterized in that a drainage and sludge discharge device is arranged on a bottom plate of the box-type shell, a plurality of drainage and sludge discharge holes are formed in the bottom plate of the box-type shell, a drainage and sludge discharge pipe is connected to a bottom opening of each drainage and sludge discharge hole, a drainage and sludge discharge control valve is connected to each drainage and sludge discharge pipe, and the lower ends of all the drainage and sludge discharge pipes are connected to a transverse drainage and sludge discharge main pipe.
2. The simulated restoration device for 1, 2-dichloroethane-containing groundwater according to claim 1, wherein a plurality of sampling ports are uniformly arranged in layers on the front wall plate and the rear wall plate of the box-type casing respectively, and the sampling ports are distributed on the front wall plate and the rear wall plate corresponding to each sample space layer separated by the porous water distribution plate; two ends of the front wall plate and the rear wall plate of the box-type shell are respectively provided with a row of overflow ports which are longitudinally arranged; and a plurality of vertical monitoring/dosing hole pipes are respectively inserted into each sample space layer separated by the porous water distribution plate in the box-type shell.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115043482A (en) * | 2022-06-28 | 2022-09-13 | 南京贝克特环保科技有限公司 | Method for treating livestock and poultry breeding wastewater by persulfate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115043482A (en) * | 2022-06-28 | 2022-09-13 | 南京贝克特环保科技有限公司 | Method for treating livestock and poultry breeding wastewater by persulfate |
| CN115043482B (en) * | 2022-06-28 | 2023-08-08 | 南京贝克特环保科技有限公司 | Method for treating livestock and poultry breeding wastewater by persulfate |
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