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A permeable reaction wall filling material, system and filling method for groundwater nitrate biological removal

A permeable reaction wall and filling material technology, applied in the field of permeable reaction wall filling materials, can solve the problems of weak denitrification and preferential flow, etc., to facilitate microbial inoculation, reduce chroma and turbidity of effluent, and prevent floating The effect of action

Active Publication Date: 2015-12-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of insufficient carbon source for denitrifying bacteria, weak denitrification, preferential flow and secondary pollution in the existing permeable reaction wall filling process, the present invention provides a permeable reaction wall for biological removal of nitrate in groundwater. The reaction wall filling material, system and filling method can flexibly add biological slow-release carbon source materials, pH buffer nutrient element materials and water treatment fillers, and can also carry out process combinations of the three materials in different proportions, avoiding the need for carbon source materials It is the shortcoming of inoculating film-hanging materials and repairing the lack of indigenous microorganisms in the area. The water treatment filter material in the effluent area can absorb ammonia nitrogen and macromolecular color organic matter to prevent secondary pollution

Method used

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  • A permeable reaction wall filling material, system and filling method for groundwater nitrate biological removal
  • A permeable reaction wall filling material, system and filling method for groundwater nitrate biological removal
  • A permeable reaction wall filling material, system and filling method for groundwater nitrate biological removal

Examples

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Embodiment 1

[0041]A permeable reaction wall filling material for the biological removal of nitrate in groundwater, which is composed of a mixture of biological slow-release carbon source materials, pH buffering nutrient element materials and bacterial flora enrichment water treatment fillers, and the mass percentages of each component are respectively : Biological slow-release carbon source material 75%, pH buffer nutrient element material 15%, bacterial flora enrichment water treatment filler 10%, among them, biological slow-release carbon source material is carbon iron given in accordance with Nanjing University National Invention Patent Application 201310727268.0 Prepared in Example 1 of the preparation method of the micro-battery slow-release carbon source filler; the core material composition and mass percentage of the pH-buffering nutrient element material are: CuSO 4 ·5H 2 O15%, CaCl 2 2H 2 O10%, citric acid 25%, attapulgite 40%, sodium alginate 10%, shell material composition an...

Embodiment 2

[0052] Same as Example 1, the difference is: 10% of the pH buffering nutrient element material, the flora enrichment water treatment filler is a porous spherical filler, and the mass percentage is 15%; the biological slow-release carbon source material is in accordance with the national invention patent application of Nanjing University 201310727268.0 prepared in Example 2 in the preparation method of carbon-iron micro-battery slow-release carbon source filler; the core material composition and mass percentage of the pH buffer nutrient element material are: FeSO 4 ·7H 2 O15%, ZnSO 4 ·7H 2 O15%, acetic acid 30%, attapulgite 30%, gum arabic 10%, shell material composition and mass percentage are: ordinary Portland cement 28%, attapulgite 60%, diatomite 12%; denitrifying bacteria domestication During the process, the concentration of nitrate in the influent is 25-30 mg / L; both the reaction inlet and outlet areas are filled with bleaching earth, and the filling material and quar...

Embodiment 3

[0055] Same as Example 1, the difference is that the biological slow-release carbon source material is 80%, the pH buffer nutrient element material is 5%, the bacterial flora enrichment water treatment filler is Pall ring, and the mass percentage is 15%; the biological slow-release carbon source The material is prepared according to Example 3 in the preparation method of carbon-iron micro-battery slow-release carbon source filler given in Nanjing University National Invention Patent Application 201310727268.0; the core material composition and mass percentage of the pH-buffering nutrient element material are: MnCl 2 4H 2 O20%, ZnSO4 7H 2 O 15%, sodium gluconate 30%, attapulgite 30%, guar gum 5%, shell material composition and mass percentage are: ordinary portland cement 30%, attapulgite 65%, diatomite 5%; During the domestication process of denitrifying bacteria, the concentration of nitrate in the influent water is 30-40mg / L; the reaction inlet and outlet areas are filled w...

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Abstract

The invention discloses a permeable reactive filler for removing nitrate organisms from underground water, a system and a filling method thereof, and belongs to the field of underground water pollution remediation. The filler for the permeable reactive barrier system is formed by the mixture of biological slow release carbon source materials, pH buffer nutrient element materials and bacteria enrichment water treatment fillers, the process inlet and outlet areas of the permeable reactive barrier system are filled with water treatment filters, a process reaction area is filled with the mixture of quartz sand or basalt and fillers, and the bacteria enrichment water treatment fillers inoculated with acclimatized native denitrifying bacteria. According to the invention, slow release carbon source materials, slow release pH nutrient element materials and water treatment fillers can be flexibly added, and the shortcomings that the carbon source materials are inoculated with hang membrane materials and native microorganisms in the remediation area are insufficient are avoided. The water treatment filters in the water outlet area are capable of preventing secondary pollution.

Description

technical field [0001] The invention belongs to the field of groundwater pollution restoration, and more specifically relates to a permeable reaction wall filling material, system and filling method for groundwater nitrate biological removal. Background technique [0002] Groundwater remediation technology is a hot issue in the field of environmental research. Countries around the world, especially European and American countries, have conducted a lot of research on the restoration of groundwater pollution. Extraction treatment is the most commonly used technology. This method can effectively limit the polluted area to the upstream of the extraction well. However, it is a long-term groundwater treatment method. However, there are many defects, such as only limiting the further spread of pollution, not being able to repair it on the spot, and the treatment cost is expensive, and it may also cause a waste of groundwater resources, destroy the original local ecological environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F3/28
Inventor 张雯阮晓红朱晓明尹琳郭红岩
Owner NANJING UNIV
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