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PRB (permeable reactive barrier) repair material applied to repairing of underground water nitrate pollution and preparation method thereof

A repair material and nitrate technology are applied in the field of PRB repair material for repairing nitrate pollution of groundwater and its preparation field, which can solve the problems of carbon source loss, failure to achieve, increase the difficulty of repair technology and repair cost, etc. The effect of good field applicability

Active Publication Date: 2018-01-09
北京市可持续发展科技促进中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the flow of groundwater and the weak affinity between aquifer media, a large amount of carbon sources will be lost, and the effect of pollution remediation will not be achieved.
Therefore, adding additional carbon sources to enhance microbial activity in groundwater will increase the difficulty of remediation technology and the cost of remediation

Method used

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  • PRB (permeable reactive barrier) repair material applied to repairing of underground water nitrate pollution and preparation method thereof
  • PRB (permeable reactive barrier) repair material applied to repairing of underground water nitrate pollution and preparation method thereof
  • PRB (permeable reactive barrier) repair material applied to repairing of underground water nitrate pollution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix cement, fine sand and bentonite according to the mass ratio of 1:0.2-0.24:0.3-0.5 to prepare a stable and solidified adhesive, which is reserved for later use.

[0023] Take 700g of reducing iron powder, 200g of stable curing binder, 160g of autotrophic denitrifying microbial bacterial agent with elemental iron as the electron donor, 600g of zeolite and 240g of sand and mix them fully and evenly, spray quantitative water to make the mixture wet ;

[0024] Put the mixture into an extrusion spheronizer for granulation, and set the extrusion speed to be 50r / min, place it to dry under natural ventilation, and the particles with a particle size of 0.8mm account for 85%, and this material is used for PRB fill material for remediation of nitrate-contaminated groundwater.

[0025] It is determined that the porosity of the PRB filling material is 20%-24%, and the particle strength is about 30N.

[0026] Through the static test at room temperature in the laboratory, the rem...

Embodiment 2

[0028] Mix cement, fine sand and bentonite according to the mass ratio of 1:0.2-0.24:0.3-0.5 to prepare a stable and solidified adhesive, which is reserved for later use.

[0029] Take 1140g of reducing iron powder, 300g of stable curing adhesive, 240g of autotrophic denitrifying microbial bacterial agent with elemental iron as electron donor, 750g of zeolite and 300g of sand and mix them fully and evenly, and spray the remaining proportion of water to make the mixture moist. wet

[0030] Put the mixture into an extrusion spheronizer for granulation, and set the extrusion speed to 50r / min, and place it to dry under natural ventilation conditions. The particles with a particle size of 1cm account for 90%, and this material is used for restoration. PRB fill material for nitrate-contaminated groundwater.

[0031] It is determined that the porosity of the PRB filling material is 25%-28%, and the particle strength is about 30N.

[0032] Through the static test in the laboratory, ...

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Abstract

The invention discloses a PRB (permeable reactive barrier) repair material applied to the repairing of underground water nitrate pollution. The PRB repair material is characterized by being prepared from the following ingredients by weight percent: 30% to 40% of oxygen trapping reducing agent, 10% to 15% of stabilizing and curing adhesive, 5% to 10% of autotrophic denitrification microbial agent,25% to 35% of microbial carrier material, 10% to 15% of sand and the balance of water. According to the PRB repair material disclosed by the invention, combined action of all the ingredients is utilized to achieve the effect that a filling material for repairing underground water nitrate by PRB has the functions of high efficiency, stability and better field adaptability; increasing apposition growth environment supply for microorganisms in underground water is facilitated; meanwhile, an effect of the adhesive can reduce loss of autotrophic denitrification microorganisms and reducibility ironpowder along with underground water flow and further can form a growth environment suitable for autotrophic microorganisms; iron ions formed in a repairing process can be absorbed by bentonite, so that effects of excessively releasing iron ions to downstream is reduced, and occurrence of secondary pollution is avoided; in addition, the characteristics of environmental friendliness and low cost ofthe PRB filling materials are achieved.

Description

technical field [0001] The invention belongs to the technical field of groundwater pollution restoration, and in particular relates to a PRB repair material for repairing nitrate pollution in groundwater and a preparation method thereof. technical background [0002] At present, the problem of groundwater pollution in my country is very prominent. A large number of man-made pollutants enter the groundwater environment through various channels, especially the increasing concentration of nitrate in groundwater, which aggravates the deterioration of groundwater quality. Nitrate itself is not toxic in the environment, but nitrate pollution still poses a threat to human health, because it is easily reduced to nitrite, which will eventually lead to methemoglobinemia (commonly known as "blue baby syndrome"), sepsis, liver disease, and even Cancer has attracted widespread attention from the whole society and the national environmental protection management department. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F103/06C02F101/20
Inventor 尉黎陈红张铮李绒滕良慧
Owner 北京市可持续发展科技促进中心
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