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Covering material for immobilized in-situ remediation of nitrogen in bottom sediment and preparation method thereof

A covering material and in-situ repairing technology, which is applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of poor biocompatibility and low strength, and achieve low cost and low bioburden The effect of good performance and strong ion exchange capacity

Active Publication Date: 2012-10-03
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the deficiencies of existing covering materials for nitrogen immobilization and restoration of sediments in underground water bodies that require high-temperature calcination, poor biocompatibility, and low strength, the present invention proposes a covering material for in-situ restoration of nitrogen immobilization in sediments and Its preparation method, the covering material of the present invention not only has cation exchange capacity, but also has fully developed biological pore structure, and at the same time, the particle hardness and particle shape can meet the requirements of engineering.

Method used

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  • Covering material for immobilized in-situ remediation of nitrogen in bottom sediment and preparation method thereof
  • Covering material for immobilized in-situ remediation of nitrogen in bottom sediment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1 part (by kilogram) of 50 mesh diatomite powder plus 8 parts (by kilogram) of 200 mesh attapulgite clay powder and 30 parts (by kilogram) of 200 mesh clinoptilolite powder, fully mixed in a mixer to prepare The powder raw material is ready for use. Add 1 part (in kilograms) of sodium hydroxide into 35 parts (in liters) of water glass with a modulus of 3.7 while stirring, and dilute with water 10 times to make an activator for later use, that is, the volume content of dilution water is 10 times the total volume of sodium hydroxide and water glass after mixing. Add 1 part by weight (in kilograms) of 200-mesh calcined kaolin powder to 1 part by volume (in liters) of the activator prepared in the previous step, and stir evenly to make a binder for later use. Add 1 part of volume (in liters) of binder to 1 part of weight (in kilograms) of the mixed mineral powder raw material prepared in the first step. Wetness is the criterion for judging. Then, rod-shaped granules with...

Embodiment 2

[0046] 1 part (by kilogram) of 80 mesh diatomite powder plus 4 parts (by kilogram) of 325 mesh attapulgite clay powder and 15 parts (by kilogram) of 325 mesh natural clinoptilolite powder, fully mixed in a mixer, Made into powder raw materials for later use. Add 1 part (in kilograms) of sodium hydroxide into 25 parts (in liters) of water glass with a modulus of 2.2 while stirring, and dilute it with water 5 times to prepare an activator for use. Add 1 part by weight (in kilograms) of 325-mesh metakaolin powder to 2 parts by volume (in liters) of the activator aqueous solution prepared in the previous step, and stir evenly to make a binder for later use. Add 1 part by volume (by liter) of binder to 1 part by weight (by kilogram) of the mixed mineral powder raw material prepared in the first step, knead and stir until semi-wet. Granulate by extrusion granulator. Cured at room temperature for 6 days.

[0047] After 6 days, the hardness of the material reaches 40N / grain, NH 4 ...

Embodiment 3

[0049] 1 part (by kilogram) of natural clinoptilolite is crushed to 325 mesh for later use. Add 1 part (in kilograms) of sodium hydroxide into 5 parts (in liters) of water glass with a modulus of 2.5 while stirring, and dilute with water 3 times to make an activator for later use. Add 1 part by weight (in kilograms) of 325-mesh fly ash to 1 part by volume (in liters) of the activator aqueous solution prepared in the previous step, and stir evenly to make a binder for later use. Add about 1 volume (in liters) of binder to 2 weights (in kilograms) of natural clinoptilolite powder, knead and stir until semi-wet. It is then granulated by an extrusion granulator. Moisturize for 5 days at room temperature.

[0050] After 5 days, the hardness of the material reaches 75N / grain, NH 4 + The ion exchange capacity is 160mmol / 100g, the saturated exchange capacity is 12.1mg / g, the ammonium absorption capacity reaches 10mg / g, the porosity is 38%, the bulk density is 0.82, and the BET spe...

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Abstract

The invention discloses a covering material for immobilized in-situ remediation of nitrogen in bottom sediment and a preparation method of the covering material, belonging to the technical field of bottom sediment covering of surface water body. The covering material is the mixture of a powdery raw material and a binding agent, wherein relative to 1L of the binding agent constituting the covering material, the content of the powdery raw material is 1-2kg; the powdery raw material comprises the following components in parts by weight: 0-1 part of porous material, 0-8 parts of attapulgite clay and 6-30 parts of natural zeolite; the binding agent consists of an active material and an excitant; and relative to 1kg of the active material constituting the binding agent, the content of the excitant is 1-3L. According to the preparation method, the powdery raw material consists of natural materials such as zeolite, the binding agent consists of inorganic polymers, and the covering material is granulated and formed by an extruder and cured at room temperature. The covering material is a medium material with strong ion exchange capability and excellent biological load property and does not need to be sintered; and moreover, the covering material provided by the invention has the advantages of higher ammonium adsorption capability and lower cost as compared with the traditional materials.

Description

technical field [0001] The invention belongs to the technical field of bottom mud covering of surface water bodies, and more specifically relates to a covering material for in-situ restoration of nitrogen immobilization in bottom mud and a preparation method thereof. Background technique [0002] With the increasing pollution of surface water in our country, part of the nutrients in the water are stored in the sediment through precipitation or adsorption, so that the sediment becomes an important reservoir of nutrients in the surface water. Under the right conditions, the nutrients in the sediment are re-released. When exogenous pollution is under control, the release of nutrient salts in the sediment becomes the main source of nutrient salts in the overlying water body. Nitrogen is the main nutrient salt element that causes eutrophication of water bodies, and its existence forms include inorganic nitrogen and organic nitrogen. Among them, excessive ammonia nitrogen in ino...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F3/00C02F1/42C02F1/28
Inventor 顾海涛王汝成阮晓红尹琳张亚平
Owner NANJING UNIV
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