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In-situ repair method for polluted sediment nitrogen nutritive salt and in-situ repairing pile applied to in-situ repair method

An in-situ restoration and sedimentation technology, which is applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of poor long-term restoration effect, improve the activity of indigenous microorganisms, and reduce costs , easy-to-operate effects

Active Publication Date: 2013-03-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problem of poor long-term restoration effect existing in the existing sediment in-situ restoration technology, the present invention provides an in-situ restoration method for sediment nitrogen nutrient pollution and an in-situ restoration pile used in the method. It can adsorb ammonia nitrogen in the sediment, reduce the diffusion of pollutants to the overlying water, and increase the dissolved oxygen at the interface between the sediment and the water, build a benign habitat at the interface in situ, promote the growth of indigenous denitrification bacteria, and accelerate the nitrogen metabolism in the sediment out of the system to achieve the goal of in-situ remediation of surface water sediments

Method used

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  • In-situ repair method for polluted sediment nitrogen nutritive salt and in-situ repairing pile applied to in-situ repair method
  • In-situ repair method for polluted sediment nitrogen nutritive salt and in-situ repairing pile applied to in-situ repair method

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Effect test

Embodiment 1

[0033] like figure 1 , the in-situ repair method of the present embodiment, the steps are:

[0034] 1) Preparation of nitrogen-immobilized materials

[0035] According to the patent "A Groundwater Nitrogen Immobilization Restoration Filter Material and Its Preparation Method" (patent application number: 201110001391.5), select clinoptilolite, palygorskite, and diatomaceous earth and mix them according to the mass ratio of 70:25:5. h 2 O as a bonding material, made into 5mm pellets in a granulator, calcined in a rotary furnace at 450°C for 4 hours, and sintered into a nitrogen-immobilized material with a particle strength >30N.

[0036] 2) Preparation of slow-release oxygen material

[0037]According to the patent "A Slow-release Oxygen Material for Groundwater Restoration and Its Preparation Method" (patent application number: 201110426869.9), calcium peroxide was selected as the oxygen-releasing agent, cement was used as the plastic binder, fly ash was used as the pH buff...

Embodiment 2

[0046] combine figure 1 , the steps of the in-situ repair method in this embodiment are as follows:

[0047] 1) Preparation of nitrogen-immobilized materials

[0048] According to the patent "A groundwater nitrogen immobilization repair filter material and its preparation method" (patent application number: 201110001391.5), select clinoptilolite, palygorskite, diatomite, mix according to the ratio of 70:25:5, and use H 2 O as a bonding material, made into 5mm pellets in a granulator, calcined in a rotary furnace at 450°C for 4 hours, and sintered into a nitrogen-immobilized material with a particle strength >30N.

[0049] 2) Preparation of slow-release oxygen materials

[0050] According to the patent "A Slow-release Oxygen Material for Groundwater Restoration and Its Preparation Method" (patent application number: 201110426869.9), calcium peroxide was selected as the oxygen-releasing agent, cement was used as the plastic binder, fly ash was used as the pH buffer, and quart...

Embodiment 3

[0056] During the test, samples were taken regularly to determine the changes in the static release of total nitrogen and ammonia nitrogen in the sediment. The results showed that after 6 months of operation, the concentration of total nitrogen and ammonia nitrogen and the content of organic matter in the sediments of the control river reach were 24.7-72.5 mg·L-1, 11.02-48.83 mg·L-1, 15.40%-20.00% respectively , the concentration of total nitrogen and ammonia nitrogen and the content of organic matter in the restored river section sediments were 5.20-7.15 mg·L-1, 2.75-3.78 mg·L-1, 9.24%-12.55%, and the restoration effect was 79%-80.1 %, 75%~92%, 37.5%~39.5%.

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Abstract

The invention discloses an in-situ repair method for polluted sediment nitrogen nutritive salt and an in-situ repairing pile applied to the in-situ repair method, and belongs to the field of sediment in-situ repair. The in-situ repair method comprises the following steps of (1) mixing a nitrogen immobilization material and a slow-release oxygen material according to a mass ratio of (5-15):1; (2) putting the mixed material into in-situ repairing piles; (3) vertically inserting the in-situ repairing piles into sediment so that the in-situ repairing piles are uniformly distributed on a plane of an area to be repaired; and (4) covering the mixed material in the step (1) on the surface of the sediment with the inserted in-situ repairing piles to obtain a sediment in-situ covering layer with the thickness of 20-30 cm. According to the in-situ repair method disclosed by the invention, ammonia nitrogen in the sediment can be adsorbed, the diffusion of polluted substances to upper covering water can be reduced, dissolved oxygen in the sediment and a hydrospheric surface is improved, the growth of aboriginal denitrified bacteria is facilitated, and nitrogen in the sediment is facilitated to be metabolized out of a system so that the purpose of in-situ repair of surface water sediment is realized.

Description

technical field [0001] The invention belongs to the field of in-situ restoration of sediments, more specifically, relates to an in-situ restoration method for sediments seriously polluted by nitrogen nutrient salts and their organic matter and an in-situ restoration pile used in the method. The application function of the method is The materials can improve the microhabitat of the sediments, and then strengthen the purification effect of the indigenous microorganisms on the nitrogen nutrients and organic matter of the sediments. Background technique [0002] Under the situation that the country's water pollution control is becoming more and more strict, the point and non-point source loads flowing into the surface water body are gradually reduced, and the endogenous pollution caused by sediments has gradually become an important pollution source of the surface water body. The metabolism of organic matter in sediments consumes a large amount of oxygen, and the metabolism of a...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 张亚平阮晓红万宇朱晓明尹林
Owner NANJING UNIV
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