CN109867347B - Ozone micro-nano bubble underground water ammonia nitrogen pollution in-situ remediation system and method - Google Patents
Ozone micro-nano bubble underground water ammonia nitrogen pollution in-situ remediation system and method Download PDFInfo
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Abstract
The in-situ repair system and method for ammonia nitrogen pollution of ozone micro-nano bubble underground water are characterized by comprising 1-3 injection wells arranged at upstream positions of underground water flowing directions in a pollution area, water pumping wells arranged at downstream positions of underground water flowing directions in the pollution area, 2-4 monitoring wells arranged at upward positions of underground water flowing directions, water pumping pipes, water pumping pumps, an ozone micro-nano bubble preparation system, a catalyst injection device, an air supply pipe connected with a water outlet of the ozone micro-nano bubble preparation system and the catalyst injection device, a control valve arranged on the air supply pipe, and 1-3 water injection pipes in one-to-one correspondence with the injection wells. The ozone micro-nano bubble preparation system is provided with a pressure bottle, an ozone generator and a micro-nano bubble generator which are sequentially connected. The invention also provides an in-situ remediation method for ammonia nitrogen pollution of the ozone micro-nano bubble underground water. The method has the advantages of high efficiency of oxidizing and degrading ammonia nitrogen pollutants, high decomposition speed, thorough removal, no secondary pollution, low cost, simplicity and feasibility.
Description
Technical Field
The invention relates to an underground water pollution remediation system, in particular to an ozone micro-nano bubble underground water ammonia nitrogen pollution in-situ remediation system, and further relates to an underground water pollution remediation method, in particular to an ozone micro-nano bubble underground water ammonia nitrogen pollution in-situ remediation method, and belongs to the technical field of underground water pollution remediation.
Background
Underground water is an important water supply source, wherein ammonia nitrogen is one of main pollutants of the underground water of most cities in China, and particularly the north has a tendency of expanding from point to face. The ammonia nitrogen can cause the water body to generate pungent odor and can be converted into a carcinogenic substance nitrite under certain conditions, thereby seriously affecting the water body quality.
In relatively reducing groundwater environments, ammonia nitrogen is difficult to convert and remove. Conventional repair technologies such as extraction treatment technologies have a serious tailing problem due to high adsorptivity of ammonia nitrogen in an aquifer medium, bioremediation technologies lose effect due to inactivation of nitrobacteria when high-concentration ammonia nitrogen is encountered, and simple and easy vapor extraction has low efficiency due to high water solubility of ammonia nitrogen; permeable reactive wall technology is difficult to implement under the condition that the depth of the aquifer is large.
In recent years, the in-situ chemical oxidation technology has been widely developed due to thorough reaction, short reaction time and low cost, and hydrogen peroxide, persulfate, potassium permanganate and ozone are common oxidants. The ozone has strong oxidation effect, so that the ammonia nitrogen pollutants can be oxidized by using hydroxyl radicals generated in the reaction, and can be completely converted into nitrogen under the action of the catalyst without introducing any pollutants. However, at present, ozone generally moves in the form of independent bubbles with millimeter-sized particle diameters after being injected into an aquifer, the bubble diffusion resistance is large, the duration is short, the influence range is small, and the repair efficiency needs to be improved urgently. The micro-nano bubbles have small particle size, strong mass transfer capacity and long existence time, and can make up the limitation of the existing in-situ repair technology.
The inventors searched the following related patent documents: CN102583712A discloses a method and a system for strengthening in-situ remediation of polluted underground water by using micro-nano bubbles, wherein a water injection well is arranged at the upstream position of a region where the underground water is polluted by pollutants, and micro-nano bubble water containing nutrient salts is introduced into the water injection well; micro-nano bubble water containing nutrient salts moves to a polluted area along with the flow of underground water, so that pollutants are decomposed or electron acceptors/donors are continuously supplemented for microorganisms, and the degradation and removal of organic pollutants are promoted; meanwhile, a pumping well is arranged to pump water at the downstream of the polluted area to form an underground water flow field; and (3) monitoring and analyzing all parameters in the organic pollutant removal process in real time through the monitoring well, and adjusting the generation time and the aeration quantity of the micro-nano bubbles. CN104140153A discloses an adopt nanotechnology to restore device and application of stratum environmental pollution, is provided with the pumping well at interval 5 ~ 10m in the direction that the groundwater flow flows at the water injection well, is provided with the filter screen in water injection well and the pumping well, is provided with a nanometer bubble saturated solution injection subassembly on the ground between water injection well and the pumping well, and this nanometer bubble saturated solution injection subassembly is connected with the pipe connection of water injection well and pumping well respectively, handles stratum environmental pollution through nanometer bubble saturated solution. CN103145232A discloses a method and a system for in-situ remediation of underground water by micro-nano bubbles, wherein a water injection well is arranged at the upstream position of an area where the underground water is polluted by organic pollutants, a micro-nano aeration device is arranged in the water injection well, power is supplied by a solar power supply device or a storage battery, and remote monitoring and control are realized with the ground by a remote wireless communication device; air and water generate water containing micro-nano bubbles through a micro-nano aeration device, and the water enters an underground water system to directly decompose organic pollutants or continuously supplement electron receptors for microorganisms so as to promote the degradation and removal of the organic pollutants; meanwhile, a monitoring well is arranged to monitor and analyze all parameters in the organic pollutant removal process in real time, and the occurrence time, the water inflow and the aeration quantity of the micro-nano bubbles are remotely adjusted according to the analysis result. CN105731628A discloses an in-situ chemical oxidation remediation system and method for chlorinated hydrocarbon pollution of underground water, the system comprising: the system comprises an ozone preparation system, a micro-nano ozone bubble water preparation system, a reinforcer injection system, a waste gas collection and treatment system and an underground injection, monitoring and air extraction system, wherein the ozone preparation system is connected with the micro-nano ozone bubble water preparation system through a pipeline, and the waste gas collection and treatment system is connected with the underground air extraction system through a pipeline; the micro-nano ozone bubble water preparation system and the reinforcer injection system are connected into the underground injection system through pipelines, and underground water polluted by chlorinated hydrocarbons is treated in situ. Methods of using the treatment system are also provided. The method is used for repairing underground water polluted by the chlorohydrocarbon, and the repairing efficiency is greatly improved; the movable use, the controller all puts in the container, can realize automaticly.
The existing micro-nano bubble technology is used for removing organic pollutants and heavy metals in underground water, and the micro-nano bubble technology aiming at ammonia nitrogen is not available. The prior art is not applicable to the oxidative removal of ammonia nitrogen because ammonia nitrogen oxidation requires precise regulation to convert it to nitrogen and not to nitrate.
The technologies have high efficiency, high decomposition speed and thorough removal of ammonia nitrogen pollutants by using the ozone micro-nano bubble underground water ammonia nitrogen pollution in-situ remediation system, and no specific guidance scheme is provided.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an ozone micro-nano bubble underground water ammonia nitrogen pollution in-situ remediation system which has the advantages of high ammonia nitrogen pollutant oxidative degradation efficiency, high decomposition speed, thorough removal, no secondary pollution, low cost, simplicity and convenience.
Therefore, the technical problem to be solved by the invention is to provide an in-situ remediation method for ammonia nitrogen pollution of ozone micro-nano bubble underground water.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides an ozone micro-nano bubble (OMNB) groundwater ammonia nitrogen pollution normal position repair system, has 1 ~ 3 injection wells that set up in pollution area groundwater flow direction upper reaches position, sets up at the pumping well of pollution area groundwater flow direction low reaches position, sets up at 2 ~ 4 monitoring wells that groundwater flowed upwards (set up in groundwater rivers top monitor well and earth's surface communicate with each other), drinking-water pipe and suction pump, its technical scheme lie in ozone micro-nano bubble groundwater ammonia nitrogen pollution normal position repair system still have ozone micro-nano bubble preparation system, catalyst injection device, connect the delivery port of ozone micro-nano bubble preparation system and catalyst injection device's air supply pipe, install the control valve on the air supply pipe, inject 1 ~ 3 water injection pipes of well and catalyst injection device one-to-one, ozone micro-nano bubble preparation system has pressure bottle, the pressure bottle that connects in proper order, The pressure bottle is connected with the ozone generator through a first air supply pipe, and the ozone generator is connected with the micro-nano bubble generator through a second air supply pipe; be equipped with the suction pump in the suction well (the suction pump is located below the groundwater water level), the suction well draws water through the suction pump, forms groundwater flow field, and the groundwater of taking out carries the micro-nano bubble preparation system of ozone through the drinking-water pipe, as the carrier liquid of micro-nano bubble to improve repair efficiency and prevent that the pollution range from expanding. The one end of micro-nano bubble generator is equipped with water inlet and air inlet, its other end is equipped with the delivery port, micro-nano bubble generator's water inlet is connected through the drinking-water pipe with the delivery port of suction pump, micro-nano bubble generator's delivery port is the micro-nano bubble water export of ozone and is connected with catalyst injection device through the air supply pipe, the upper end and the air supply pipe of (every) water injection pipe that catalyst injection and the micro-nano bubble of ozone injection were carried out to the injection well are linked together, (every) the bottom of water injection pipe lets in the injection well (and be located below the groundwater water level), the control valve of installing on the air supply pipe is located between water injection pipe and the catalyst injection device, thus, the micro-nano bubble water of ozone, catalyst (sodium bromide) lets in the injection well through the water injection pipe, the oxidation effect of ozone micro-nano bubble is used for strengthening to the catalyst.
In the above technical scheme, a preferred technical scheme may be that the pressure cylinder in the ozone micro-nano bubble preparation system is an industrial-grade oxygen cylinder; the gas supply pipe is provided with a gas flowmeter for recording gas production.
The in-situ remediation method for ammonia nitrogen pollution of ozone micro-nano bubble underground water adopts (uses) the in-situ remediation system for ammonia nitrogen pollution of ozone micro-nano bubble underground water, and is characterized by comprising the following steps of:
firstly, arranging 1-3 injection wells at the upstream position of a region with underground water polluted by ammonia nitrogen, arranging 1 pumping well at the downstream position of the region, and upwards arranging 2-4 monitoring wells in underground water flow of the region;
secondly, pumping water in a pumping well by using a water pump to form an underground water flow field, wherein the pumping speed is obtained by software simulation by controlling the injection flow rate;
thirdly, starting an ozone generator, and inputting oxygen in the pressure bottle into the ozone generator to generate ozone;
fourthly, simultaneously introducing the underground water pumped in the second step and the ozone generated in the third step into a micro-nano bubble generator to form ozone micro-nano bubble water;
fifthly, injecting the ozone micro-nano bubble water prepared in the fourth step into the underground, opening a control valve arranged above an injection well, injecting the catalyst sodium bromide in the catalyst injection device and the ozone micro-nano bubble water into the underground through a water injection pipe in the injection well, so that the ozone micro-nano bubble is diffused along with the movement of the underground water, and decomposing ammonia nitrogen pollutants;
and sixthly, monitoring the degradation degree of the ammonia nitrogen pollutants and the sodium bromide content in the underground water by using a monitoring well, adjusting the injection time (time) of the micro-nano bubbles and the injection concentration (injection amount) of the sodium bromide, and judging the restoration degree of the ammonia nitrogen pollution of the underground water.
In the above technical scheme, the preferable technical scheme may be that the pressure cylinder is an industrial-grade oxygen cylinder, and the oxygen purity is more than or equal to 99%; the ozone generator is cooled by circulating water, is externally connected with an oxygen source, is automatically controlled by a microcomputer, does not need to be manually attended, and generates ozone with the concentration (percentage content) of more than or equal to 5 percent. The particle size of the bubbles generated by the micro-nano bubble generator is between 200nm and 4 mu m, and the bubble content is 84 to 90 percent.
In the fifth step, the injection concentration (injection amount) of the catalyst sodium bromide is determined according to the following calculation formula, wherein the injection concentration (injection amount) of the catalyst sodium bromide is related to the bromine content in the underground water and the ozone content in the micro-nano bubble water:
in the formula: c (Br)-) The initial bromine ion adding concentration of an injection well is in mg/L, namely the content of sodium bromide in per liter of ozone micro-nano bubble water injected into the underground; c (O)3)Micro-nano bubble waterIs micro-nanoThe ozone concentration in the bubble water is mg/L; c (Br)-)Ground waterThe unit is the concentration of bromide ions in underground water and is mg/L. Along with the progress of the repair technology, the concentration of bromide ions in the underground water is gradually increased, and the adding concentration required by the injection port is reduced. The flow rate (injection flow rate) of the catalyst sodium bromide and the ozone micro-nano bubble water injected into the ground through a water injection pipe in an injection well is controlled to be 0.5-1m/h, and the injection flow rate can be determined by adopting underground water numerical simulation software. In the fifth step, the flow rate of the catalyst sodium bromide and the ozone micro-nano bubble water injected into the underground through the water injection pipe in the injection well can be controlled to be 1m/h, and the total injection amount of the catalyst sodium bromide and the ozone micro-nano bubble water injected into the underground can be 6m3The injection flow rate can be 36-78L/h, the adding content of the initially injected catalyst sodium bromide is 5.4mg/L, namely, 5.4mg of sodium bromide is contained in each liter of ozone micro-nano bubble water injected underground. The above data values were obtained according to application example 1 of the present specification, and the data values were not unique (depending on site hydrogeology and degree of contamination).
The invention provides an in-situ remediation technology (system and method) for ammonia nitrogen pollution of underground water based on an ozone micro-nano bubble technology, wherein ozone with the concentration of more than 5% is used as a micro-nano bubble gas source, sodium bromide is added as a catalyst, and an in-situ remediation method for an ammonia nitrogen pollution site of the underground water is formed by controlling an underground water flow field.
The method realizes efficient oxidative degradation of ammonia nitrogen pollutants in the underground water by generating the ozone micro-nano bubbles, has the advantages of high oxidative degradation efficiency, high speed, thorough removal, no secondary pollution, low cost, simplicity, convenience and feasibility and has good application prospect compared with other in-situ remediation technologies.
Compared with the prior art, the beneficial effects produced by adopting the invention are as follows:
1. ozone is used as an oxidant, the reaction condition is mild, the degradation efficiency is high, the byproducts are few, and the oxidant can not introduce any pollutant and can effectively oxidize and degrade ammonia nitrogen pollutants in soil and underground water.
2. According to the invention, sodium bromide is screened out through a large number of experiments in the early stage as the ozone micro-nano bubble catalyst, the oxidation capability of micro-nano ozone bubbles can be further increased, the repair effect is enhanced, ammonia nitrogen can be thoroughly oxidized into nontoxic and harmless nitrogen gas by reasonably controlling the usage amount and reaction conditions of the catalyst, the added sodium bromide is controlled in a safe range, and the water body cannot be polluted due to excessive addition of bromine.
3. The invention can ensure that ozone has higher solubility in water, excite more superoxide radicals and hydroxyl radicals, prolong the retention time of ozone in water, enlarge the contact range of ozone and ammonia nitrogen pollutants in underground water and improve the oxidation efficiency.
4. Through the control to groundwater flow field, the micro-nano bubble of ozone that will make spreads great scope, and its strong mass transfer ability can further promote the degradation of pollutant, improves oxidation remediation efficiency.
5. The invention can monitor various parameters in real time, carry out scientific analysis and evaluation on the repairing effect, further reduce the cost and improve the repairing efficiency.
Drawings
Fig. 1 is a schematic structural diagram of the present invention (one embodiment).
Fig. 2 is a schematic diagram of the layout of an injection well, a pumping well and a monitoring well according to one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: as shown in figure 1, the ozone micro-nano bubble (OMNB) groundwater ammonia nitrogen pollution in-situ remediation system provided by the invention comprises 1-3 injection wells 7 arranged at the upstream position of groundwater flow direction in a pollution area, a pumping well 9 arranged at the downstream position of groundwater flow direction in the pollution area, 2-4 monitoring wells 8 arranged in the groundwater flow direction, a pumping pipe 10 and a pumping pump 11, an ozone micro-nano bubble preparation system 13, a catalyst injection device 14, an air supply pipe 2 connecting a water outlet of the ozone micro-nano bubble preparation system and the catalyst injection device, a control valve 6 arranged on the air supply pipe 2, and 1-3 water injection pipes 12 corresponding to the injection wells one by one. The ozone micro-nano bubble preparation system 13 is provided with a pressure bottle 1, an ozone generator 3 and a micro-nano bubble generator 4 which are sequentially connected in sequence, wherein the pressure bottle 1 is connected with the ozone generator 3 through a first air supply pipe 2 ', and the ozone generator 3 is connected with the micro-nano bubble generator 4 through a second air supply pipe 2'. Be equipped with suction pump 11 in the suction well 9 (the suction pump is located below the groundwater water level), suction well 9 draws water through suction pump 11, forms the groundwater flow field, and the groundwater of taking out carries the micro-nano bubble preparation system of ozone through drinking-water pipe 10, as the carrier liquid of micro-nano bubble to improve repair efficiency and prevent that the pollution range from expanding. One end of the micro-nano bubble generator 4 is provided with a water inlet and an air inlet, the other end of the micro-nano bubble generator 4 is provided with a water outlet, the water inlet of the micro-nano bubble generator 4 is connected with the water outlet of the water pump 11 through a water pumping pipe 10, the water outlet of the micro-nano bubble generator 4, namely an ozone micro-nano bubble water outlet, is connected with a catalyst injection device 14 through an air supply pipe 2, the upper end of a water injection pipe 12 for injecting catalyst and micro-nano bubbles of ozone into the injection well is communicated with the air supply pipe 2, the bottom end of the water injection pipe 12 is led into the injection well 7 (and is positioned below the water level of underground water), a control valve 6 arranged on the air supply pipe 2 is positioned between the water injection pipe 12 and a catalyst injection device 14, therefore, the ozone micro-nano bubble water and the catalyst (sodium bromide) are introduced into the injection well 7 through the water injection pipe 12, and the catalyst is used for enhancing the oxidation effect of the ozone micro-nano bubbles. In fig. 1, the line a represents groundwater level and the arrow B represents groundwater flow direction.
The pressure bottle 1 in the ozone micro-nano bubble preparation system is an industrial-grade oxygen bottle; the gas supply pipe 2 is provided with a gas flow meter 5 for recording gas production.
Example 2: as shown in fig. 1, the in-situ remediation method for ammonia nitrogen pollution of ozone micro-nano bubble groundwater disclosed by the invention adopts (uses) the in-situ remediation system for ammonia nitrogen pollution of ozone micro-nano bubble groundwater described in embodiment 1, and is characterized in that the in-situ remediation method for ammonia nitrogen pollution of ozone micro-nano bubble groundwater comprises the following steps:
firstly, arranging 1-3 injection wells 7 at the upstream position of a region with underground water polluted by ammonia nitrogen, arranging 1 pumping well 9 at the downstream position of the region, and upwards arranging 2-4 monitoring wells 8 in underground water flow of the region;
secondly, pumping water in a pumping well 9 by using a pumping pump 11 to form an underground water flow field, wherein the pumping speed is obtained by controlling the injection flow rate through software simulation;
thirdly, starting the ozone generator 3, and inputting oxygen in the pressure bottle 1 into the ozone generator to generate ozone;
fourthly, simultaneously introducing the underground water pumped in the second step and the ozone generated in the third step into a micro-nano bubble generator 4 to form ozone micro-nano bubble water;
fifthly, when the ozone micro-nano bubble water prepared in the fourth step is injected into the ground, a control valve 6 arranged above an injection well 7 is opened, and the sodium bromide catalyst in a catalyst injection device 14 and the ozone micro-nano bubble water are injected into the ground through a water injection pipe 12 in the injection well 7, so that the ozone micro-nano bubbles are diffused along with the movement of the ground water, and ammonia nitrogen pollutants are decomposed;
and sixthly, monitoring the degradation degree of the ammonia nitrogen pollutants and the sodium bromide content in the underground water by using a monitoring well 8, adjusting the injection time (time) of the micro-nano bubbles and the injection concentration of the sodium bromide, and judging the restoration degree of the ammonia nitrogen pollution of the underground water.
The pressure bottle 1 is an industrial grade oxygen bottle, and the purity of oxygen is more than or equal to 99 percent; the ozone generator 3 is cooled by circulating water, is externally connected with an oxygen source, is automatically controlled by a microcomputer, does not need to be manually attended, and generates ozone with the concentration more than or equal to 5 percent. The particle size of the bubbles generated by the micro-nano bubble generator 4 is between 200nm and 4 mu m, and the bubble content is 84 to 90 percent. In the fifth step, the catalyst sodium bromide is injectedThe input concentration, namely the input content, is related to the bromine content in the underground water and the ozone content in the micro-nano bubble water, and the injection amount of the catalyst sodium bromide is determined according to the following calculation formula:
in the formula: c (Br)-) The initial bromine ion adding concentration of an injection well is in mg/L, namely the content of sodium bromide in per liter of ozone micro-nano bubble water injected into the underground; c (O)3)Micro-nano bubble waterThe concentration of ozone in the micro-nano bubble water is mg/L; c (Br)-)Ground waterThe unit is the concentration of bromide ions in underground water and is mg/L. Along with the progress of the repair technology, the concentration of bromide ions in the underground water is gradually increased, and the adding content required by the injection port is reduced. The flow rate (injection flow rate) of the catalyst sodium bromide and the ozone micro-nano bubble water injected into the ground through a water injection pipe 12 in an injection well 7 is controlled to be 0.5-1m/h, and the injection flow rate can be determined by adopting underground water numerical simulation software.
Application example 1: the technology (system and method) is used for repairing ammonia nitrogen pollution of underground water in a waste site of a northern chemical plant, wherein the east-west length of the polluted site is 13m, and the north-south width is 9.5 m. The water level buried depth of the underground water in the field is about 4m, and the water level elevation is 2-4 m. The total flow direction of the underground water is from the northwest to the southeast, and the runoff is slow. According to the previous investigation and sampling results, the area is a site pollution source area, the soil in the aeration zone and the aquifer above 20m are seriously polluted, wherein NH4 +N is a characteristic pollutant of underground water in a polluted area, the concentration is up to 2000mg/L, and the content of bromide ions in the underground water is 0.3 mg/L. Aiming at the aquifer, 1 injection well 7 and a corresponding (3) single-hole monitoring well 8 are arranged in the southeast corner of the field in the in-situ remediation test, and 1 pumping well 9 is built at the downstream position of underground water. The injection well 7 is positioned at the most upstream and is in a section with the monitoring well 8, the mutual distance between the monitoring wells 8 is 1m (or 2m), and the distance between the pumping well and the injection well 7 is 5 m. The specific location of each well is shown in figure 2.
In the application example, the catalyst sodium bromide is injected into the ground together with the ozone micro-nano bubble water through the water injection pipe 12 in the injection well 7The flow rate of the catalyst is controlled to be 1m/h, and the total injection amount (the total injection amount of the aquifer) of the catalyst sodium bromide and the ozone micro-nano bubble water injected into the underground is 6m3. The concentration of ozone in the micro-nano bubble water is 24.43 mg/L. The adding content of the initially injected catalyst sodium bromide is calculated to be 5.4mg/L according to a formula, namely, each liter of ozone micro-nano bubble water injected underground contains 5.4mg of sodium bromide. The injection flow rate was determined by groundwater numerical simulation to be 36-78L/h (62.5L/h may be used). Monitoring the monitoring well 8 in real time during the injection phase to determine NH4 +-N and Br-And (4) concentration. After 4 days, NH in aquifer groundwater4 +the-N removal rate reaches 93 percent.
Application example 2: in a certain waste fertilizer plant polluted by ammonia nitrogen, the underground water is buried about 9m deep, and the thickness of a water-bearing layer is close to 6 m. The pollution area is 850m2NH in ground water4 +The average total concentration of the N pollutants reaches 786mg/L, and the initial bromide ion concentration in the underground water is 4.7 mg/L. According to the hydrogeology condition in place and pollution degree, this pollutes the place and lays 1 injection well altogether, 1 pumping well, because bromide ion concentration is greater than 24% of micro-nano bubble aquatic ozone concentration in the groundwater, so need not additionally to add catalyst sodium bromide. The injection flow of an injection well is determined to be 6-10L/h through simulation, and meanwhile, 4 monitoring wells are arranged in a polluted site for monitoring the remediation effect. The depth of the well pipes of all injection wells, pumping wells and monitoring wells is 15m, wherein solid pipes are adopted for more than 0-9m, and screen pipes are adopted for 9-15 m. The result shows that the technology can effectively oxidize the target pollutant (ammonia nitrogen) in the site soil after 7 days of in-situ injection, and the average removal rate is 91 percent.
Application example 3: in a certain waste plant, the underground water is buried about 11m deep and the thickness of the aquifer is nearly 8 m. NH in ground water due to influence of leaked ammonia4 +The maximum concentration of the-N pollutant is as high as 17860mg/L, and the initial bromide ion concentration in the underground water is 1.9 mg/L. Because the place pollution condition is serious, the smell is sharp, 3 injection wells, 1 pumping well and 3 monitoring wells are arranged in the pollution place. The injection flow rate of a single injection well is determined to be 12-14L/h through simulation, and the extraction flow rate is 36-42L/h. Micro-nano bubble water odorThe oxygen concentration was 39 mg/L. And obtaining the initial sodium bromide adding content of 7.2mg/L according to a catalyst adding content calculation formula. The final result is that after the micro-nano bubble injection experiment for 18 days, the maximum concentration of the ammonia nitrogen pollutants is reduced to 84mg/L, and the average removal rate is 99.5%.
Compared with the prior art, the system and the method for in-situ remediation of ammonia nitrogen pollution of the ozone micro-nano bubble underground water have the advantages of high efficiency of oxidation and degradation of the ammonia nitrogen pollutants, high decomposition speed (the remediation work efficiency is improved by more than 25%), thorough removal, no secondary pollution, low cost (the remediation cost is reduced by more than 30%), simplicity, convenience, practicability and convenience in popularization and application.
Claims (6)
1. The utility model provides an ozone micro-nano bubble groundwater ammonia nitrogen pollution normal position repair system, has 1 ~ 3 mouth injection wells (7) that set up in contaminated area groundwater flow direction upper reaches position, sets up at pumping well (9) of contaminated area groundwater downstream position, sets up at ascending 2 ~ 4 monitoring wells (8) of groundwater, drinking-water pipe (10) and suction pump (11), its characterized in that ozone micro-nano bubble groundwater ammonia nitrogen pollution normal position repair system still have ozone micro-nano bubble preparation system (13), catalyst injection device (14), connect delivery port and catalyst injection device's air supply pipe (2) of ozone micro-nano bubble preparation system, install control valve (6) on air supply pipe (2), with injection well one-to-one corresponding 1 ~ 3 water injection pipe (12), ozone micro-nano bubble preparation system (13) have pressure bottle (1) that connect gradually, The ozone generator (3) and the micro-nano bubble generator (4), the pressure bottle (1) is connected with the ozone generator (3) through a first air supply pipe (2 '), and the ozone generator (3) is connected with the micro-nano bubble generator (4) through a second air supply pipe (2'); be equipped with suction pump (11) in suction well (9), the water inlet of micro-nano bubble generator (4) is connected through drinking-water pipe (10) with the delivery port of suction pump (11), the delivery port of micro-nano bubble generator (4) is the micro-nano bubble water export of ozone through air supply pipe (2) and catalyst injection device (14) be connected, the upper end of carrying out catalyst injection and water injection pipe (12) of the micro-nano bubble of ozone injection into to the injection well is linked together with air supply pipe (2), the bottom of water injection pipe (12) lets in injection well (7), control valve (6) installed on air supply pipe (2) are located between water injection pipe (12) and catalyst injection device (14).
2. The system for in-situ remediation of ammonia nitrogen pollution of underground water by using ozone micro-nano bubbles according to claim 1, characterized in that a pressure cylinder (1) in the system for preparing ozone micro-nano bubbles is an industrial-grade oxygen cylinder; the gas supply pipe (2) is provided with a gas flowmeter (5) for recording gas production.
3. An ozone micro-nano bubble underground water ammonia nitrogen pollution in-situ remediation method, which adopts the ozone micro-nano bubble underground water ammonia nitrogen pollution in-situ remediation system of claim 1, and is characterized in that the ozone micro-nano bubble underground water ammonia nitrogen pollution in-situ remediation method comprises the following steps:
firstly, arranging 1-3 injection wells (7) at the upstream position of a region with groundwater polluted by ammonia nitrogen, arranging 1 pumping well (9) at the downstream position of the region, and upwards arranging 2-4 monitoring wells (8) in groundwater flow of the region;
secondly, pumping water in a pumping well (9) by using a water pump (11) to form an underground water flow field;
thirdly, starting an ozone generator (3), inputting oxygen in the pressure bottle (1) into the ozone generator, and generating ozone;
fourthly, simultaneously introducing the underground water pumped in the second step and the ozone generated in the third step into a micro-nano bubble generator (4) to form ozone micro-nano bubble water;
fifthly, the ozone micro-nano bubble water prepared in the fourth step is injected into the ground, meanwhile, a control valve (6) arranged above an injection well (7) is opened, and the catalyst sodium bromide in a catalyst injection device (14) and the ozone micro-nano bubble water pass through a water injection pipe in the injection well (7) together(12) Injecting the ozone micro-nano bubbles into the ground to diffuse with the movement of underground water, and decomposing ammonia nitrogen pollutants; the injection concentration of the catalyst sodium bromide is determined according to the following calculation formula:
(ii) a In the formula:
the initial bromine ion adding concentration of an injection well is in mg/L, namely the content of sodium bromide in per liter of ozone micro-nano bubble water injected into the underground;
the concentration of ozone in the micro-nano bubble water is mg/L;
the unit is the concentration of bromide ions in the groundwater and is mg/L; the flow rate of the catalyst sodium bromide and the ozone micro-nano bubble water injected into the ground through a water injection pipe (12) in an injection well (7) is controlled to be 0.5-1 m/h;
and sixthly, monitoring the degradation degree of the ammonia nitrogen pollutants and the sodium bromide content in the underground water by using a monitoring well (8), adjusting the injection time of the micro-nano bubbles and the injection amount of the sodium bromide, and judging the restoration degree of the ammonia nitrogen pollution of the underground water.
4. The in-situ remediation method for ammonia nitrogen pollution of underground water by using micro-nano ozone bubbles according to claim 3, characterized in that the pressure cylinder (1) is an industrial-grade oxygen cylinder, and the oxygen purity is more than or equal to 99%; the ozone generator (3) is cooled by circulating water and is externally connected with an oxygen source, and the concentration of generated ozone is more than or equal to 5 percent.
5. The in-situ remediation method for ammonia nitrogen pollution of underground water by using micro-nano ozone bubbles according to claim 3, wherein the particle size of the bubbles generated by the micro-nano bubble generator (4) is 200 nm-4 μm, and the bubble content is 84% -90%.
6. The in-situ remediation method for ammonia nitrogen pollution of underground water by ozone micro-nano bubble according to claim 3, wherein in the fifth step, the flow rate of the sodium bromide catalyst and the ozone micro-nano bubble water injected into the underground through the water injection pipe (12) in the injection well (7) is controlled to be 1m/h, and the total injection amount of the sodium bromide catalyst and the ozone micro-nano bubble water injected into the underground is 6m3The injection flow is 36-78L/h, the adding content of the initially injected catalyst sodium bromide is 5.4mg/L, namely, 5.4mg of sodium bromide is contained in each liter of ozone micro-nano bubble water injected underground.
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| CN113683180A (en) * | 2021-08-27 | 2021-11-23 | 宝航环境修复有限公司 | Ozone advanced oxidation system for underground water in-situ pumping treatment |
| CN114751472A (en) * | 2022-05-12 | 2022-07-15 | 东南大学 | Underground water circulating well device for in-situ remediation of contaminated site and remediation method |
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