CN111924927A - Method for treating nitrite in underground water based on PRBS technology - Google Patents
Method for treating nitrite in underground water based on PRBS technology Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 title claims abstract description 14
- 101150071746 Pbsn gene Proteins 0.000 title claims abstract 6
- 239000000463 material Substances 0.000 claims abstract description 49
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000003673 groundwater Substances 0.000 claims description 12
- 230000008595 infiltration Effects 0.000 claims description 12
- 238000001764 infiltration Methods 0.000 claims description 12
- 239000012466 permeate Substances 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 12
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 238000001179 sorption measurement Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000009738 saturating Methods 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 229910002651 NO3 Inorganic materials 0.000 abstract description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000945 filler Substances 0.000 abstract description 6
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 abstract description 5
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000011161 development Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 206010028980 Neoplasm Diseases 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 208000005135 methemoglobinemia Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/166—Nitrites
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a PRBS technology-based method for treating nitrite in underground water, which particularly relates to the technical field of nitrite nitrogen treatment and specifically comprises the following steps: the method comprises the following steps: simulating an underground water permeation environment, and step two: filling material preparation, step three: adjusting the pH value of the solution, and step four: controlling the permeation flow rate, and step five: sampling and detecting. The method can greatly reduce the nitrite nitrogen content in the underground water, and the reaction rate is gradually increased along with the increase of the proportion of the zero-valent iron in the filler, which shows that the zero-valent iron can rapidly remove nitrogen elements in the nitrate nitrogen under a certain permeation condition, so that the pollution of the nitrate in the underground water is better treated, the rapid removal effect is achieved, the process is simple, the equipment requirement is low, and the operability is strong.
Description
Technical Field
The invention relates to the technical field of nitrite treatment, in particular to a method for treating nitrite in groundwater based on a PRBS (pre-clean room base) technology.
Background
With the development of industry and agriculture and the rapid improvement of national economy, the problem of water resources becomes an important environmental problem which puzzles the economic development of all countries in the world. China is in strict shortage of water resources, underground water resources play a significant role in the formation of water resources in China, and many places develop and utilize underground water resources. In China, underground water nitrate pollution, organic matter pollution, heavy metal pollution and the like become the most main pollution sources. If the nitrate content in the drinking water is too high, methemoglobinemia is caused, and cancer is seriously even induced to die. This is related to the economic development of our country and the physical and mental health of people, and is very slow. The treatment of nitrate pollution of underground water has developed a plurality of technologies, such as biodegradation technology, impervious wall technology, hydraulic isolation technology and the like.
However, these technologies all have great defects and shortcomings, the development of better-updated in-situ treatment technology of groundwater has become a common topic of scientific and technological workers in various countries in the world, and many technologies in this respect have been developed in recent years, wherein the technology of Permeable Reactive Barriers (PRBS) is a technology for in-situ treatment of groundwater in the field developed in the 70 s of the 20 th century.
Disclosure of Invention
In order to overcome the above defects in the prior art, the invention provides the following technical scheme: a treatment method of nitrite in groundwater based on PRBS technology specifically comprises the following steps:
the method comprises the following steps: simulating an underground water infiltration environment, and simulating the underground water infiltration environment in a laboratory according to the following steps:
s1: a TST-70 type permeameter is used as an experimental device, and a water seepage hole is communicated with a rubber pipe to inject water into the bottom of the device until the top surface of a copper net is flush;
s2: 5.0kg of prepared air-dried sample is taken;
s3: layering air-dried sample samples and filling the samples into a cylinder, controlling the thickness of each layer of sample to be 2-3cm, and lightly compacting by using a wood hammer;
s4: slightly opening the pipe clamp after each layer of the sample is assembled, enabling water to slowly permeate upwards from the water seepage cylinder, gradually saturating the sample, closing the pipe clamp after saturation, and controlling the bent part of the pipe not to store bubbles;
s5: continuously loading samples in a layered mode according to S4 until the samples are saturated and are higher than the upper piezometer tube by 3-4cm, placing a gravel layer with the thickness of 1-2cm on the samples, discharging water and being higher than the gravel surface by 2-3cm, and closing the pipe clamp;
s6: removing the water source of the water seepage hole to ensure that the water is injected into the instrument from the top until the water surface is flush with the overflow hole;
s7: checking the water level of the piezometer tube to ensure that the water level is level;
s8: reducing the height of the pipe orifice of the adjusting pipe to one third of the upper part of the sample, so that the instrument generates water head, water permeates the sample and flows out through the pipe orifice of the adjusting pipe, and the water level in the cylinder is kept unchanged;
s9: when the water level of the pressure measuring pipe is stable, the water level of the pressure measuring pipe is measured, and the water level difference between the pressure measuring pipes 1 and 2 and between the pressure measuring pipes 2 and 3 is calculated;
s10: starting a stopwatch, and measuring the amount of the permeated water after a certain time by using a measuring cylinder self-adjusting pipe;
step two: preparing a filling material, namely taking an iron material and a sand material in a weight ratio of 80: 20-50: 50, uniformly mixing, and putting the mixture into a permeation-adsorption reaction grid to be used as the filling material;
step three: adjusting the pH value of the solution, extracting a sample of wastewater solution, detecting the pH value of the solution sample in a laboratory environment, adding a pH regulator into the solution, and controlling the initial pH value of the solution to be 4.00;
step four: controlling the permeation flow rate, and controlling the flow rate to be in a range of 6.0-8.0cm/h through the permeability of materials in an experimental device and a reactor.
Step five: and (4) sampling and detecting, namely after the steps I to IV are completed, sampling for the first time after 8 hours, then taking a water sample every 12 hours for performing an indoor experiment, and taking a water sample every 24 hours after 96 hours for testing.
In a preferred embodiment, the saturation degree in the step S4 is specifically indicated by the level of the water level being equal to the top surface of the sample.
In a preferred embodiment, the specific index of the certain time in the step one S10 is 4 min.
In a preferred embodiment, the grain size of the zero-valent iron material in the filler material 1, the filler material 2, the filler material 3 and the filler material 4 in the second step is controlled to be 0.25-1.0mm, and the grain size of the sand material is controlled to be 1.0-2.0 mm.
The invention has the technical effects and advantages that:
according to the invention, zero-valent iron is added into the filling material in the permeation adsorption reaction grid, so that the content of nitrite nitrogen in wastewater can be greatly reduced, and the reaction rate is gradually increased along with the increase of the proportion of zero-valent iron in the filling material, which indicates that under a certain permeation condition, the zero-valent iron can rapidly remove nitrogen elements in nitrate nitrogen, thereby better treating underground water nitrate pollution, achieving a rapid removal effect, and having the advantages of simple process, low equipment requirement and strong operability.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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:
the invention provides a treatment method of nitrite in groundwater based on PRBS technology, which comprises the following steps:
the method comprises the following steps: simulating an underground water infiltration environment, and simulating the underground water infiltration environment in a laboratory according to the following steps:
s1: a TST-70 type permeameter is used as an experimental device, and a water seepage hole is communicated with a rubber pipe to inject water into the bottom of the device until the top surface of a copper net is flush;
s2: 5.0kg of prepared air-dried sample is taken;
s3: layering air-dried sample samples and placing the samples into a cylinder, controlling the thickness of each layer of the samples to be 2cm, and lightly compacting the samples by using a wooden hammer;
s4: slightly opening the pipe clamp after each layer of the sample is assembled, enabling water to slowly permeate upwards from the water seepage cylinder, enabling the water surface height to be equal to the top surface of the sample, closing the pipe clamp after the water surface is saturated, and controlling the bent part of the pipe not to have air bubbles;
s5: continuously loading samples in a layered mode according to S4 until the samples are saturated and are higher than the upper piezometer tube by 3cm, placing a gravel layer with the thickness of 1cm on the samples, discharging water and being higher than the gravel surface by 2cm, and closing the pipe clamp;
s6: removing the water source of the water seepage hole to ensure that the water is injected into the instrument from the top until the water surface is flush with the overflow hole;
s7: checking the water level of the piezometer tube to ensure that the water level is level;
s8: reducing the height of the pipe orifice of the adjusting pipe to one third of the upper part of the sample, so that the instrument generates water head, water permeates the sample and flows out through the pipe orifice of the adjusting pipe, and the water level in the cylinder is kept unchanged;
s9: when the water level of the pressure measuring pipe is stable, the water level of the pressure measuring pipe is measured, and the water level difference between the pressure measuring pipes 1 and 2 and between the pressure measuring pipes 2 and 3 is calculated;
s10: starting a stopwatch, and measuring the amount of the permeating water by using a measuring cylinder self-adjusting pipe every 4 min;
step two: preparing a filling material, namely taking an iron material and a sand material in a weight ratio of 80:20, uniformly mixing, and putting the mixture into a permeation-adsorption reaction grid to be used as the filling material, wherein the grain diameter of the zero-valent iron material is controlled to be 0.25mm, and the grain diameter of the sand material is controlled to be 1.0 mm;
step three: adjusting the pH value of the solution, extracting a sample of wastewater solution, detecting the pH value of the solution sample in a laboratory environment, adding a pH regulator into the solution, and controlling the initial pH value of the solution to be 4.00;
step four: the permeation flow rate was controlled to be in the range of 6.0cm/h by the permeability of the material in the experimental setup and reactor.
Step five: and (4) sampling and detecting, namely after the steps I to IV are completed, sampling for the first time after 8 hours, then taking a water sample every 12 hours for performing an indoor experiment, and taking a water sample every 24 hours after 96 hours for testing.
Example 2:
the invention provides a treatment method of nitrite in groundwater based on PRBS technology, which comprises the following steps:
the method comprises the following steps: simulating an underground water infiltration environment, and simulating the underground water infiltration environment in a laboratory according to the following steps:
s1: a TST-70 type permeameter is used as an experimental device, and a water seepage hole is communicated with a rubber pipe to inject water into the bottom of the device until the top surface of a copper net is flush;
s2: 5.0kg of prepared air-dried sample is taken;
s3: layering air-dried sample samples and placing the samples into a cylinder, controlling the thickness of each layer of the samples to be 2cm, and lightly compacting the samples by using a wooden hammer;
s4: slightly opening the pipe clamp after each layer of the sample is assembled, enabling water to slowly permeate upwards from the water seepage cylinder, enabling the water surface height to be equal to the top surface of the sample, closing the pipe clamp after the water surface is saturated, and controlling the bent part of the pipe not to have air bubbles;
s5: continuously loading samples in a layered mode according to S4 until the samples are saturated and are higher than the upper piezometer tube by 3cm, placing a gravel layer with the thickness of 1cm on the samples, discharging water and being higher than the gravel surface by 2cm, and closing the pipe clamp;
s6: removing the water source of the water seepage hole to ensure that the water is injected into the instrument from the top until the water surface is flush with the overflow hole;
s7: checking the water level of the piezometer tube to ensure that the water level is level;
s8: reducing the height of the pipe orifice of the adjusting pipe to one third of the upper part of the sample, so that the instrument generates water head, water permeates the sample and flows out through the pipe orifice of the adjusting pipe, and the water level in the cylinder is kept unchanged;
s9: when the water level of the pressure measuring pipe is stable, the water level of the pressure measuring pipe is measured, and the water level difference between the pressure measuring pipes 1 and 2 and between the pressure measuring pipes 2 and 3 is calculated;
s10: starting a stopwatch, and measuring the amount of the permeating water by using a measuring cylinder self-adjusting pipe every 4 min;
step two: preparing a filling material, namely taking an iron material and a sand material in a weight ratio of 70:30, uniformly mixing, and putting the mixture into a permeation-adsorption reaction grid to be used as the filling material, wherein the grain diameter of the zero-valent iron material is controlled to be 0.5mm, and the grain diameter of the sand material is controlled to be 1.5 mm;
step three: adjusting the pH value of the solution, extracting a sample of wastewater solution, detecting the pH value of the solution sample in a laboratory environment, adding a pH regulator into the solution, and controlling the initial pH value of the solution to be 4.00;
step four: the permeation flow rate was controlled to be in the range of 7.0cm/h by the permeability of the material in the experimental setup and reactor.
Step five: and (4) sampling and detecting, namely after the steps I to IV are completed, sampling for the first time after 8 hours, then taking a water sample every 12 hours for performing an indoor experiment, and taking a water sample every 24 hours after 96 hours for testing.
Example 3:
the invention provides a treatment method of nitrite in groundwater based on PRBS technology, which comprises the following steps:
the method comprises the following steps: simulating an underground water infiltration environment, and simulating the underground water infiltration environment in a laboratory according to the following steps:
s1: a TST-70 type permeameter is used as an experimental device, and a water seepage hole is communicated with a rubber pipe to inject water into the bottom of the device until the top surface of a copper net is flush;
s2: 5.0kg of prepared air-dried sample is taken;
s3: layering air-dried sample samples and placing the samples into a cylinder, controlling the thickness of each layer of the samples to be 3cm, and lightly compacting the samples by using a wooden hammer;
s4: slightly opening the pipe clamp after each layer of the sample is assembled, enabling water to slowly permeate upwards from the water seepage cylinder, enabling the water surface height to be equal to the top surface of the sample, closing the pipe clamp after the water surface is saturated, and controlling the bent part of the pipe not to have air bubbles;
s5: continuously loading samples in a layered mode according to S4 until the samples are saturated and are higher than the upper piezometer tube by 4cm, placing a gravel layer with the thickness of 2cm on the samples, discharging water and being higher than the gravel surface by 3cm, and closing the pipe clamp;
s6: removing the water source of the water seepage hole to ensure that the water is injected into the instrument from the top until the water surface is flush with the overflow hole;
s7: checking the water level of the piezometer tube to ensure that the water level is level;
s8: reducing the height of the pipe orifice of the adjusting pipe to one third of the upper part of the sample, so that the instrument generates water head, water permeates the sample and flows out through the pipe orifice of the adjusting pipe, and the water level in the cylinder is kept unchanged;
s9: when the water level of the pressure measuring pipe is stable, the water level of the pressure measuring pipe is measured, and the water level difference between the pressure measuring pipes 1 and 2 and between the pressure measuring pipes 2 and 3 is calculated;
s10: starting a stopwatch, and measuring the amount of the permeating water by using a measuring cylinder self-adjusting pipe every 4 min;
step two: preparing a filling material, namely taking an iron material and a sand material in a weight ratio of 60:40, uniformly mixing, and putting the mixture into a permeation-adsorption reaction grid to be used as the filling material, wherein the grain diameter of the zero-valent iron material is controlled to be 0.75mm, and the grain diameter of the sand material is controlled to be 1.5 mm;
step three: adjusting the pH value of the solution, extracting a sample of wastewater solution, detecting the pH value of the solution sample in a laboratory environment, adding a pH regulator into the solution, and controlling the initial pH value of the solution to be 4.00;
step four: the permeation flow rate was controlled to be in the range of 8.0cm/h by the permeability of the material in the experimental setup and reactor.
Step five: and (4) sampling and detecting, namely after the steps I to IV are completed, sampling for the first time after 8 hours, then taking a water sample every 12 hours for performing an indoor experiment, and taking a water sample every 24 hours after 96 hours for testing.
Example 4:
the invention provides a treatment method of nitrite in groundwater based on PRBS technology, which comprises the following steps:
the method comprises the following steps: simulating an underground water infiltration environment, and simulating the underground water infiltration environment in a laboratory according to the following steps:
s1: a TST-70 type permeameter is used as an experimental device, and a water seepage hole is communicated with a rubber pipe to inject water into the bottom of the device until the top surface of a copper net is flush;
s2: 5.0kg of prepared air-dried sample is taken;
s3: layering air-dried sample samples and placing the samples into a cylinder, controlling the thickness of each layer of the samples to be 2cm, and lightly compacting the samples by using a wooden hammer;
s4: slightly opening the pipe clamp after each layer of the sample is assembled, enabling water to slowly permeate upwards from the water seepage cylinder, enabling the water surface height to be equal to the top surface of the sample, closing the pipe clamp after the water surface is saturated, and controlling the bent part of the pipe not to have air bubbles;
s5: continuously loading samples in a layered mode according to S4 until the samples are saturated and are higher than the upper piezometer tube by 3cm, placing a gravel layer with the thickness of 1cm on the samples, discharging water and being higher than the gravel surface by 2cm, and closing the pipe clamp;
s6: removing the water source of the water seepage hole to ensure that the water is injected into the instrument from the top until the water surface is flush with the overflow hole;
s7: checking the water level of the piezometer tube to ensure that the water level is level;
s8: reducing the height of the pipe orifice of the adjusting pipe to one third of the upper part of the sample, so that the instrument generates water head, water permeates the sample and flows out through the pipe orifice of the adjusting pipe, and the water level in the cylinder is kept unchanged;
s9: when the water level of the pressure measuring pipe is stable, the water level of the pressure measuring pipe is measured, and the water level difference between the pressure measuring pipes 1 and 2 and between the pressure measuring pipes 2 and 3 is calculated;
s10: starting a stopwatch, and measuring the amount of the permeating water by using a measuring cylinder self-adjusting pipe every 4 min;
step two: preparing a filling material, namely taking an iron material and a sand material in a weight ratio of 70:30, uniformly mixing, and putting the mixture into a permeation-adsorption reaction grid to be used as the filling material, wherein the grain diameter of the zero-valent iron material is controlled to be 0.5mm, and the grain diameter of the sand material is controlled to be 1.5 mm;
step three: adjusting the pH value of the solution, extracting a sample of wastewater solution, detecting the pH value of the solution sample in a laboratory environment, adding a pH regulator into the solution, and controlling the initial pH value of the solution to be 4.00;
step four: the permeation flow rate was controlled to be in the range of 7.0cm/h by the permeability of the material in the experimental setup and reactor.
Step five: and (4) sampling and detecting, namely after the steps I to IV are completed, sampling for the first time after 8 hours, then taking a water sample every 12 hours for performing an indoor experiment, and taking a water sample every 24 hours after 96 hours for testing.
The solutions treated in examples 1-4 were tested to obtain the following data:
| nitrate nitrogen removal at 8h (%) | Nitrate nitrogen concentration (mg/l) | |
| Example 1 | 65.278 | 3.633 |
| Example 2 | 58.895 | 4.301 |
| Example 3 | 57.973 | 4.397 |
| Example 4 | 57.225 | 4.475 |
The above table shows that the raw material mixing proportion in the example 1 is moderate, the nitrite nitrogen content in the wastewater can be greatly reduced, and the reaction rate gradually increases with the increase of the proportion of the zero-valent iron in the filler, which indicates that the zero-valent iron can rapidly remove the nitrogen element in the nitrate nitrogen under certain permeation conditions, so that the groundwater nitrate pollution can be better treated, the rapid removal effect can be achieved, the process is simple, the equipment requirement is low, and the operability is strong.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (4)
1. A treatment method of nitrite in groundwater based on PRBS technology is characterized in that: the method specifically comprises the following steps:
the method comprises the following steps: simulating an underground water infiltration environment, and simulating the underground water infiltration environment in a laboratory according to the following steps:
s1: a TST-70 type permeameter is used as an experimental device, and a water seepage hole is communicated with a rubber pipe to inject water into the bottom of the device until the top surface of a copper net is flush;
s2: 5.0kg of prepared air-dried sample is taken;
s3: layering air-dried sample samples and filling the samples into a cylinder, controlling the thickness of each layer of sample to be 2-3cm, and lightly compacting by using a wood hammer;
s4: slightly opening the pipe clamp after each layer of the sample is assembled, enabling water to slowly permeate upwards from the water seepage cylinder, gradually saturating the sample, closing the pipe clamp after saturation, and controlling the bent part of the pipe not to store bubbles;
s5: continuously loading samples in a layered mode according to S4 until the samples are saturated and are higher than the upper piezometer tube by 3-4cm, placing a gravel layer with the thickness of 1-2cm on the samples, discharging water and being higher than the gravel surface by 2-3cm, and closing the pipe clamp;
s6: removing the water source of the water seepage hole to ensure that the water is injected into the instrument from the top until the water surface is flush with the overflow hole;
s7: checking the water level of the piezometer tube to ensure that the water level is level;
s8: reducing the height of the pipe orifice of the adjusting pipe to one third of the upper part of the sample, so that the instrument generates water head, water permeates the sample and flows out through the pipe orifice of the adjusting pipe, and the water level in the cylinder is kept unchanged;
s9: when the water level of the pressure measuring pipe is stable, the water level of the pressure measuring pipe is measured, and the water level difference between the pressure measuring pipes 1 and 2 and between the pressure measuring pipes 2 and 3 is calculated;
s10: starting a stopwatch, and measuring the amount of the permeated water after a certain time by using a measuring cylinder self-adjusting pipe;
step two: preparing a filling material, namely taking an iron material and a sand material in a weight ratio of 80: 20-50: 50, uniformly mixing, and putting the mixture into a permeation-adsorption reaction grid to be used as the filling material;
step three: adjusting the pH value of the solution, extracting a sample of wastewater solution, detecting the pH value of the solution sample in a laboratory environment, adding a pH regulator into the solution, and controlling the initial pH value of the solution to be 4.00;
step four: controlling the permeation flow rate, wherein the flow rate is controlled to be 6.0-8.0cm/h through the permeability of materials in an experimental device and a reactor;
step five: and (4) sampling and detecting, namely after the steps I to IV are completed, sampling for the first time after 8 hours, then taking a water sample every 12 hours for performing an indoor experiment, and taking a water sample every 24 hours after 96 hours for testing.
2. The method for treating nitrite in groundwater based on PRBS technology as claimed in claim 1, wherein: in the first step S4, the specific saturation level is that the water level is level with the top surface of the sample.
3. The method for treating nitrite in wastewater based on PRBS technology as claimed in claim 1, wherein: the specific index of a certain time in the step I S10 is 4 min.
4. The method for treating nitrite in groundwater based on PRBS technology as claimed in claim 1, wherein: in the second step, the grain diameter of the zero-valent iron material is controlled to be 0.25-1.0mm, and the grain diameter of the sand material is controlled to be 1.0-2.0 mm.
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| CN202010769959.7A CN111924927A (en) | 2020-08-04 | 2020-08-04 | Method for treating nitrite in underground water based on PRBS technology |
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| CN202010769959.7A CN111924927A (en) | 2020-08-04 | 2020-08-04 | Method for treating nitrite in underground water based on PRBS technology |
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| CN114853217A (en) * | 2022-05-24 | 2022-08-05 | 中国石油化工股份有限公司 | Device and method for cooperatively treating nitrobenzene wastewater by using coal water slurry technology |
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