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CN-122010309-A - Preparation method and device of underground permeable reaction wall

CN122010309ACN 122010309 ACN122010309 ACN 122010309ACN-122010309-A

Abstract

The invention relates to a preparation method and a device of an underground permeable reactive barrier, which comprises the following components in parts by weight. Compared with the prior art, the metal-rich biochar is used as an underground permeable reactive barrier material, electrons are released in the metal simple substance corrosion process, dissolved low-valence metal ions can rapidly consume dissolved oxygen in the environment to create a reducing environment favorable for the survival of additional strains, and meanwhile, polymorphic valence-changing metals in the metal-rich biochar phase can effectively mediate the electron transfer process of an extracellular respiratory chain of microorganisms, and the electrons are transferred to terminal acceptor metal ions or persistent organic pollutants to accelerate the provision of electrons to reduce Cr6 + and remove toxic groups of benzene rings. The metal-rich biochar is matched with engineering bacteria agent, so that high-efficiency removal of various macromolecular organic pollutants and rapid stabilization of high-valence heavy metals can be realized.

Inventors

  • WANG LEI
  • LIU JIN
  • LI SHAOFENG
  • SHI CHUNMING
  • WANG YANGYANG
  • WANG XIAOSHU
  • WANG JINSHENG
  • XI BEIDOU

Assignees

  • 深圳职业技术大学

Dates

Publication Date
20260512
Application Date
20251107
Priority Date
20241109

Claims (9)

  1. 1. The preparation method of the underground permeable reactive barrier is characterized in that the following materials are added in the process of building the underground permeable reactive barrier: The composite material comprises, by weight, 10-30 parts of steel slag, 10-20 parts of water glass, 5-20 parts of manganese sand, 20-40 parts of metal-rich biochar, 5-10 parts of fluorgypsum, 10-20 parts of fly ash, 1-5 parts of red mud, 20-30 parts of ball-milling hematite, 1-5 parts of gravel and 5-15 parts of engineering bacteria.
  2. 2. The preparation method of the underground permeable reactive barrier according to claim 1, wherein the added materials comprise, by weight, 20 parts of steel slag, 15 parts of water glass, 10 parts of manganese sand, 30 parts of metal-rich biochar, 8 parts of fluorogypsum, 15 parts of fly ash, 3 parts of red mud, 25 parts of ball-milling hematite, 3 parts of gravel and 10 parts of engineering bacteria.
  3. 3. The method for preparing an underground permeable reactive barrier according to claim 2, wherein the engineering bacteria are a mixture of electroactive microorganisms and functional microorganisms, including but not limited to shiva, geobacillus, desulphurisation, denitrifying bacteria, rhodosporidium and brevibacillus laterosporus.
  4. 4. The method for preparing an underground permeable reactive barrier according to claim 3, wherein the Shewanella, the geobacillus, the desulphurizer, the denitrifying bacteria, the lilyturf-purple spore bacteria and the Brevibacillus laterosporus are added in a ratio of 5:5:3:3:1:3.
  5. 5. The method for preparing an underground permeable reactive barrier according to claim 4, wherein the metal-rich biochar is prepared by: s100, planting Siberian iris in a solution containing iron, manganese, cobalt, cerium and zinc ions, culturing for two months, harvesting and drying; S200, cleaning, drying and crushing the dried plants in 1mmol/L hydrochloric acid solution to obtain dry biomass containing metal; and S300, calcining the dry biomass containing the metal to obtain the metal-rich biochar.
  6. 6. The method for preparing an underground permeable reactive barrier according to claim 5, characterized in that, in said step S100: the solution containing metal ions is ferric chloride, manganese chloride, cobalt chloride, cerium chloride, zinc chloride and sodium nitrate solution, and the concentration is 300mg/L.
  7. 7. The method for preparing an underground permeable reactive barrier according to claim 6, characterized in that, in said step S300: the dried biomass containing the metal was calcined at 900 ℃ for 2 hours in an atmosphere of N 2 .
  8. 8. The method for preparing an underground permeable reactive barrier according to claim 2, wherein the engineering bacteria and the metal-rich biochar are embedded in sodium alginate pellets.
  9. 9. An underground permeable reactive barrier device constructed according to the method of any one of claims 1 to 8.

Description

Preparation method and device of underground permeable reaction wall Technical Field The invention belongs to the technical field of permeable reactive barrier materials, and particularly relates to a preparation method and a preparation device of an underground permeable reactive barrier. Background Groundwater pollution has become a serious environmental problem in China, and the work of treating the polluted groundwater is urgent. The permeable reactive barrier (permeable reactive barrier, PRB) technology is an emerging technology for restoring polluted groundwater, has the characteristics of good treatment effect, low cost, small influence on ecological environment and the like, and can effectively remove organic chloride, heavy metal, inorganic ions and the like in the groundwater. The permeable reactive barrier technology is to construct a reactive barrier composed of reactive materials in the direction of the flow of the polluted groundwater, and remove pollutants in the groundwater through the adsorption, precipitation, chemical degradation or biodegradation of the reactive materials. The underground water pollution plume is blocked and repaired through a permeable reaction wall, and a reaction medium filled in the reaction wall comprises zero-valent iron, zeolite, a carbon source for enhancing the activity of microorganisms and the like, and the treatment comprises a physical, chemical or biological action process. However, the permeable reactive barrier technology has certain technical limitations, such as limited medium capacity of the underground reactive barrier, and the possibility of removing pollutants without limit, and for high-concentration pollutants, the removal energy and capacity of the pollutants need to be considered, and the service life of the permeable reactive barrier is sometimes shortened. In addition, the action in the reaction medium may cause precipitation of materials, altering the flow field of groundwater at and near the reaction wall, and blockage of the reaction medium may lead to failure of the permeable reaction wall. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a preparation method and a preparation device of an underground permeable reactive barrier, which are used for solving the technical problems mentioned in the background art. In order to achieve one of the above objects, the present invention provides the following technical solutions: the preparation method of the underground permeable reactive barrier comprises the following steps of: The composite material comprises, by weight, 10-30 parts of steel slag, 10-20 parts of water glass, 5-20 parts of manganese sand, 20-40 parts of metal-rich biochar, 5-10 parts of fluorgypsum, 10-20 parts of fly ash, 1-5 parts of red mud, 20-30 parts of ball-milling hematite, 1-5 parts of gravel and 5-15 parts of engineering bacteria. Preferably, the added materials comprise, by weight, 20 parts of steel slag, 15 parts of water glass, 10 parts of manganese sand, 30 parts of metal-rich biochar, 8 parts of fluorogypsum, 15 parts of fly ash, 3 parts of red mud, 25 parts of ball-milling hematite, 3 parts of gravel and 10 parts of engineering bacteria. Preferably, the engineering bacteria are a mixture of electroactive microorganisms and functional microorganisms including, but not limited to, shewanella, geobacillus, desulfureobacteria, denitrifying bacteria, lespedezia rhodosporum, brevibacillus laterosporus, and the like. Preferably, shewanella, geobacillus, desulphurisation, denitrifying bacteria, lilyturf and Brevibacterium laterosporus are added in a ratio of 5:5:3:3:1:3. Preferably, the metal-rich biochar is prepared by the following method: s100, planting Siberian iris in a solution containing iron, manganese, cobalt, cerium and zinc ions, culturing for two months, harvesting and drying; S200, cleaning, drying and crushing the dried plants in 1mmol/L hydrochloric acid solution to obtain dry biomass containing metal; and S300, calcining the dry biomass containing the metal to obtain the metal-rich biochar. Preferably, in said step S100: the solution containing metal ions is ferric chloride, manganese chloride, cobalt chloride, cerium chloride, zinc chloride and sodium nitrate solution, and the concentration is 300mg/L. Preferably, in said step S300: the dried biomass containing the metal was calcined at 900 ℃ for 2 hours in an atmosphere of N 2. Preferably, the engineering bacteria and the metal-rich biochar are embedded in sodium alginate pellets. In order to achieve the second purpose, the invention provides the following technical scheme: An underground permeable reactive barrier device constructed according to the method of making an underground permeable reactive barrier described above. Compared with the prior art, the preparation method and the device for the underground permeable reactive barrier provided by the invention have the following advantages: 1.