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Preparation method and application of sediment-water interface phosphorus release control material

A sediment and water interface technology, applied in chemical instruments and methods, water/sludge/sewage treatment, polluted waterway/lake/pond/river treatment, etc., can solve the problems of high phosphorus release risk and high ecological risk , to achieve the effect of improving adsorption capacity and adsorption strength, cheap materials, increasing porosity and specific surface area

Active Publication Date: 2017-01-04
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of high ecological risk and high risk of phosphorus release in the existing technology of using water purification sludge as the covering material, and to provide a low-cost material with high safety and strong practicability. Preparation method and application of sediment-water interface phosphorus release control material with strong removal effect on low-concentration phosphate

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  • Preparation method and application of sediment-water interface phosphorus release control material
  • Preparation method and application of sediment-water interface phosphorus release control material
  • Preparation method and application of sediment-water interface phosphorus release control material

Examples

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Effect test

Embodiment 1

[0041] The sediment-water interface phosphorus release control material described in this example is prepared by the following method:

[0042] (1) Collect lake bottom mud as raw material, freeze-dry, grind and sieve to obtain sediment powder with a particle size of not less than 100 mesh, and set aside; take kaolin, dry, grind and sieve to obtain kaolin powder with a particle size of not less than 100 mesh body, spare;

[0043] (2) Fully mix the sediment powder and kaolin powder in proportion to form a mixed powder, the amount of the kaolin accounts for 10wt% of the total mass of the mixed powder, and set aside;

[0044] (3) Utilize 5mol / L HNO 3 The aqueous solution oxidizes the mixed powder, and the HNO 3 The mass ratio of the aqueous solution to the mixed powder is 50:1, then placed in a blast drying box and evaporated to dryness, taken out and cooled to room temperature;

[0045] Then use 0.2mol / L FeSO 4 The aqueous solution is used to modify the oxidized mixed powder,...

Embodiment 2

[0048] The sediment-water interface phosphorus release control material described in this example is prepared by the following method:

[0049] (1) Collect lake bottom mud as raw material, freeze-dry, grind and sieve to obtain sediment powder with a particle size of 150-200 mesh, and set aside; take kaolin, dry, grind and sieve to obtain a particle size of 150-200 mesh Kaolin powder, spare;

[0050] (2) Fully mix the sediment powder and kaolin powder in proportion to form a mixed powder, the amount of the kaolin accounts for 80wt% of the total mass of the mixed powder, and set aside;

[0051] (3) Utilize 5mol / L HNO 3 The aqueous solution oxidizes the mixed powder, and the HNO 3 The mass ratio of the aqueous solution to the mixed powder is 50:1, then placed in a blast drying box and evaporated to dryness, taken out and cooled to room temperature;

[0052] Then use 0.2mol / L FeSO 4 The aqueous solution is used to modify the oxidized mixed powder, and the FeSO 4 The mass rati...

Embodiment 3

[0055] The sediment-water interface phosphorus release control material described in this example is prepared by the following method:

[0056] (1) Collect lake bottom mud as raw material, freeze-dry, grind and sieve to obtain sediment powder with a particle size of 120-300 mesh, and set aside; take kaolin, dry, grind and sieve to obtain a particle size of 120-300 mesh Kaolin powder, spare;

[0057] (2) Fully mix the sediment powder and kaolin powder in proportion to form a mixed powder, the amount of the kaolin accounts for 70wt% of the total mass of the mixed powder, and set aside;

[0058] (3) Utilize 5mol / L HNO 3 The aqueous solution oxidizes the mixed powder, and the HNO 3 The mass ratio of the aqueous solution to the mixed powder is 50:1, then placed in a blast drying box and evaporated to dryness, taken out and cooled to room temperature;

[0059] Then use 0.2mol / L FeSO 4 The aqueous solution is used to modify the oxidized mixed powder, and the FeSO 4 The mass rati...

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Abstract

The invention provides a preparation method and application of a sediment-water interface phosphorus release control material. For the first time, a lake sediment and kaolin mixture is used as a basic raw material, and processes like oxidation, iron salt modification, granulation and calcination are adopted, so that adsorption-desorption balance concentration EPC0 value of the material to phosphate is remarkably lowered, linear distribution coefficient Kd value of the material is increased, and the material can effectively reduce sediment interstitial water phosphate concentration and can inhibit sediment-water interface phosphate release. The material itself has weak phosphate desorption capability and high adsorption and buffering capability, so that the material can truly realize effective obstruction and control on sediment-water interface phosphorus release. The material is low in material cost, high in social and economic benefit and safety, free of ecological risk to lake water, energy-saving and environment-friendly and has remarkable effect on controlling sediment-water interface phosphorus release in different lake areas of the Dian Lake in the process of application.

Description

technical field [0001] The invention relates to a preparation method and application of a phosphorus release control material at a sediment-water interface, and belongs to the field of water environment pollution control. Background technique [0002] Over the past 30 years, due to the development of social economy and the impact of human activities, a large number of exogenous pollutants have entered lakes and enriched in sediments, causing serious pollution to the bottom of most lakes in my country. The survey results show that many lakes, especially urban lakes, are seriously polluted. For example, the total phosphorus content in the sediments of many waters such as Taihu Lake, Dianchi Lake, and Chaohu Lake is as high as 3000-4000mg / kg. Sediment is not only an important destination and reservoir of surface water pollutants, but also an important endogenous source of overlying water pollution. This is because there is a dynamic equilibrium process of sedimentation, adsorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
CPCC02F11/008C02F2103/007
Inventor 焦立新王圣瑞赵海超
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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