CN107555610B - PRB (reactive Barrier) repairing material for repairing nitrate pollution of underground water and preparation method thereof - Google Patents
PRB (reactive Barrier) repairing material for repairing nitrate pollution of underground water and preparation method thereof Download PDFInfo
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- CN107555610B CN107555610B CN201710822329.XA CN201710822329A CN107555610B CN 107555610 B CN107555610 B CN 107555610B CN 201710822329 A CN201710822329 A CN 201710822329A CN 107555610 B CN107555610 B CN 107555610B
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Abstract
The PRB repairing material for repairing nitrate pollution of underground water is characterized by comprising the following components in percentage by weight: 30% -40% of oxygen-trapping reducing agent; 10% -15% of stable curing adhesive; 5% -10% of autotrophic denitrification microbial agent; 25% -35% of microbial carrier material; 10% -15% of sand; the balance being water. The invention utilizes the composite action of the components to realize the functions of high efficiency, stability and better field applicability of the filling material for restoring the nitrate of the underground water by the PRB, is beneficial to increasing the attachment and growth environment of the microorganisms in the underground water, reduces the loss of autotrophic denitrifying microorganisms and reducing iron powder along with the underground water flow through the action of the adhesive, and forms a good growth environment suitable for the chemoautotrophic microorganisms; iron ions formed in the repairing process can be adsorbed with bentonite, so that the influence of excessive release of the iron ions on the downstream is reduced, and the occurrence of secondary pollution is avoided; in addition, the characteristics of environmental protection and low cost of the PRB filling material can also be realized.
Description
Technical Field
The invention belongs to the technical field of groundwater pollution remediation, and particularly relates to a PRB remediation material for remediating groundwater nitrate pollution and a preparation method thereof.
Technical Field
At present, the problem of groundwater pollution in China is very prominent, a large amount of artificial pollutants enter the groundwater environment through various ways, and particularly, the deterioration of groundwater quality is aggravated due to the continuous increase of the concentration of nitrate in groundwater. Nitrate in the environment is not toxic, but nitrate pollution still threatens human health, and is easy to be reduced into nitrite, so that methemoglobinemia (commonly called as 'blue infant disease'), septicemia, liver diseases and even cancers are finally caused, wide attention of the people in the whole society and high attention of the national environmental protection management department are attracted, and therefore, research on groundwater nitrate remediation technology and materials is an important link for groundwater pollution remediation.
The selection and research of the repair material are important for repairing the pollution of the underground water, and the proper repair material can effectively remove the pollutants in the underground water and reduce the pollution degree. But because the concentration of pollutants in the groundwater environment is generally lower and the specificity of the groundwater environment, higher requirements are also provided for the groundwater pollution remediation material. The existing groundwater nitrate remediation technology mainly comprises the following steps: physical, chemical and biological methods, in which nitrate in groundwater is mainly remediated by zero-valent iron, enhancing microorganisms. In particular, the denitrifying bacteria usually need to add extra carbon sources for degrading the nitrates, so as to enhance the activity of the denitrifying bacteria in the environment and improve the content of the nitrates removed by the denitrifying bacteria in the groundwater. The choice of carbon source in practical applications is limited by many factors, such as the microbial enhancing properties of the carbon source, the long-term presence of the carbon source in the environment, and the cost of the carbon source. When the zero-valent iron restores nitrate pollution in underground water, the zero-valent iron reduces and degrades nitrate, the products are ammonia nitrogen, nitrite and other substances, and the zero-valent iron is converted into Fe2+And Fe3+Precipitates are easy to form, and the phenomenon of blockage occurs. In addition, because of groundwater flow and weak affinity between aquifer media, a large amount of carbon source can be lost, and the pollution remediation effect cannot be achieved. Therefore, the additional addition of carbon source to enhance the activity of microorganisms in the groundwater will increase the difficulty of remediation technology and the cost of remediation.
Disclosure of Invention
Aiming at the defects of the nitrate remediation technology in underground water, the invention provides a PRB (reactive barrier) remediation material for remedying the nitrate pollution of the underground water and a preparation method thereof, and the PRB remediation material has strong feasibility, practicability and good economic value.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the PRB repairing material for repairing nitrate pollution of underground water is characterized by comprising the following components in percentage by weight:
wherein the oxygen-capturing reducing agent is zero-valent iron, and the particle size of the oxygen-capturing reducing agent is controlled to be 0.8mm-1.4 mm;
the stable curing adhesive is ordinary portland cement, fine sand and bentonite, and the mass ratio of the components is 1: 0.2-0.24: 0.3-0.5;
the autotrophic denitrification microbial agent is autotrophic denitrification bacteria taking elemental iron as an electron donor;
the microbial carrier material is zeolite, the particle size is controlled to be 1.9mm-3.3mm, and the specific gravity range is 2.0-2.6g/cm3And the porosity is 40-55%.
The PRB repairing material for repairing the nitrate pollution of the underground water is granular, and the average grain diameter of the granules is 0.5cm-1 cm.
The invention also provides a preparation method of the PRB repairing material for repairing nitrate pollution of underground water, which is characterized in that the PRB repairing material comprises the following components in percentage by weight:
uniformly mixing cement, fine sand and bentonite according to the mass ratio of 1: 0.2-0.24: 0.3-0.5 to prepare a stable curing adhesive;
uniformly mixing all components of the PRB repairing material according to the proportion, and then spraying quantitative water to fully wet the PRB repairing material;
putting the wet mixture into a granulator for spheronization granulation, and setting the extrusion speed to be 50 r/min;
and naturally airing the obtained PRB repairing material particles under the natural ventilation condition, wherein the average particle size is 0.5cm-1 cm.
The PRB repairing material for repairing the nitrate pollution of the underground water realizes the functions of high efficiency, stability and better field applicability of the filling material for repairing the nitrate of the underground water by the PRB by utilizing the composite action of the oxygen-capturing reducing agent, the stable curing adhesive, the autotrophic denitrifying bacteria taking elemental iron as an electron donor, the microbial carrier material, the sand and the water, is beneficial to increasing the microorganism attaching growth environment in the underground water, reduces the loss of autotrophic denitrifying microorganisms and reductive iron powder along with the underground water flow under the action of the adhesive, and forms a good growth environment suitable for the chemoautotrophic microorganisms; the iron ions formed in the repairing process can be adsorbed with bentonite, the influence of excessive released iron ions on the downstream is reduced, and the occurrence of secondary pollution is avoided: in addition, the characteristics of environmental protection and low cost of the PRB filling material can also be realized.
Detailed Description
The invention is further illustrated by the following specific examples:
example 1
Uniformly mixing cement, fine sand and bentonite according to the mass ratio of 1: 0.2-0.24: 0.3-0.5 to prepare a stable curing adhesive for later use.
Taking 700g of reducing iron powder, 200g of stable curing adhesive, 160g of autotrophic denitrification microbial agent taking elemental iron as an electron donor, 600g of zeolite and 240g of sand, fully and uniformly mixing, and spraying quantitative water to enable the mixture to be in a moist state;
and (3) putting the mixture into an extrusion spheronization granulator for granulation, setting the extrusion speed to be 50r/min, placing and airing under a natural ventilation condition, wherein particles with the particle size of 0.8mm account for 85%, and the material is the PRB filling material for repairing nitrate pollution of underground water.
The porosity of the PRB filler material was determined to be 20% -24% with a particle strength of about 30N.
Through static test in a laboratory at room temperature, the material achieves 84% of nitrate removal rate.
Example 2
Uniformly mixing cement, fine sand and bentonite according to the mass ratio of 1: 0.2-0.24: 0.3-0.5 to prepare a stable curing adhesive for later use.
1140g of reducing iron powder, 300g of stable curing adhesive, 240g of autotrophic denitrification microbial agent taking elemental iron as an electron donor, 750g of zeolite and 300g of sand are fully and uniformly mixed, and the rest proportion of water is sprayed to wet the mixture;
and (3) putting the mixture into an extrusion spheronization granulator for granulation, setting the extrusion speed to be 50r/min, placing and airing under a natural ventilation condition, wherein particles with the particle size of 1cm account for 90%, and the material is the PRB filling material for repairing nitrate pollution of underground water.
The porosity of the PRB filler material was determined to be 25% -28% with a particle strength of about 30N.
Through a static test in a laboratory, the removal rate of the material to nitrate in water reaches 78% under the conditions of low temperature (15 ℃), no light and anaerobic environment.
The above embodiments are merely illustrative of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (4)
1. The PRB repairing material for repairing nitrate pollution of underground water is characterized by comprising the following components in percentage by weight:
wherein the oxygen-capturing reducing agent is zero-valent iron, the particle size of the oxygen-capturing reducing agent is controlled to be 0.8mm-1.4mm, the stable curing adhesive is ordinary portland cement, fine sand and bentonite, the mass ratio of the ordinary portland cement, the fine sand and the bentonite is 1: 0.2-0.24: 0.3-0.5, and the autotrophic denitrification microbial agent is autotrophic denitrification bacteria taking elemental iron as an electron donor.
2. The PRB repair material of claim 1, wherein the microbial carrier material is a zeoliteThe grain diameter is controlled to be 1.9mm-3.3mm, and the specific gravity range is 2.0-2.6g/cm3And the porosity is 40-55%.
3. The PRB repair material according to any of claims 1-2, wherein the PRB repair material is in a particle shape, and the average particle size of the particles is in the range of 0.5cm-1 cm.
4. The method of preparing a PRB repair material according to any of claims 1-3, comprising the following steps:
a. uniformly mixing ordinary portland cement, fine sand and bentonite according to the mass ratio of 1: 0.2-0.24: 0.3-0.5 to prepare a stable curing adhesive;
b. uniformly mixing all components of the PRB repairing material according to a proportion, and spraying quantitative water to fully wet the PRB repairing material;
c. putting the wet mixture into a granulator for spheronization granulation, and setting the extrusion speed to be 50 r/min;
d. naturally airing the obtained granules under the natural ventilation condition, wherein the average grain diameter of the granules is 0.5cm-1 cm.
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| CN110591716A (en) * | 2018-06-13 | 2019-12-20 | 岳西县九方农业有限公司 | Stabilization repair material suitable for heavy metal pollution of tailing waste stone and preparation method |
| CN111960569A (en) * | 2020-08-04 | 2020-11-20 | 安徽省环境科学研究院 | Zero-valent iron-based method for treating nitrate in wastewater |
| CN114249507A (en) * | 2022-01-17 | 2022-03-29 | 江苏省环境科学研究院 | Based on Fe0Composite permeable reactive barrier system of bentonite modified biochar filler and application thereof |
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| CN101219832B (en) * | 2008-01-25 | 2010-06-16 | 天津大学 | Carbon emission material for renovation of nitrogen hydrogen nitrate pollution groundwater and production method |
| WO2011047181A2 (en) * | 2009-10-14 | 2011-04-21 | The Administrators Of The Tulane Educational Fund | Novel multifunctional materials for in-situ environmental remediation of chlorinated hydrocarbons |
| KR20140099772A (en) * | 2013-02-04 | 2014-08-13 | 동아대학교 산학협력단 | Method and apparatus for continuous removal of perchlorate and nitrate by using halotolerant microorganisms |
| CN103803703B (en) * | 2014-02-25 | 2016-01-06 | 合肥工业大学 | A kind of Nanoscale Iron and microorganism act synergistically the method for synchronous denitrification dephosphorizing |
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