Preparation method and application of efficient removing materials for interstitial water phosphate of sediments

A water phosphate and sediment technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high phosphorus release risk and high ecological risk

Active Publication Date: 2017-01-11
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 interstitial water phosphate efficient removal material with strong removal effect on sediment interstitial water with low concentration of phosphate

Method used

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  • Preparation method and application of efficient removing materials for interstitial water phosphate of sediments
  • Preparation method and application of efficient removing materials for interstitial water phosphate of sediments
  • Preparation method and application of efficient removing materials for interstitial water phosphate of sediments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The sediment interstitial water phosphate efficient removal material described in this example is prepared by the following method:

[0038] (1) Collect lake sediments as raw materials, freeze-dry, grind and sieve to obtain sediment powders with a particle size of not less than 100 mesh, place the sediment powders in a muffle furnace at 450°C for 2 hours, and wait for After cooling to room temperature, use 0.2mol / L sodium hydroxide aqueous solution to wash with water, then place it in a blast drying oven and evaporate to dryness to obtain activated deposits, which are set aside;

[0039] (2) Take kaolin, dry, grind and sieve to obtain kaolin powder with a particle size of not less than 100 mesh, fully mix the activated sediment and kaolin powder in proportion to form a mixed powder, and the consumption of the kaolin accounted for 100% of the mixed powder. 75wt% of the total mass of the body, standby;

[0040] (3) Using 0.2mol / L FeSO 4 The aqueous solution is used to m...

Embodiment 2

[0043] The sediment interstitial water phosphate efficient removal material described in this example is prepared by the following method:

[0044] (1) Collect lake sediments as raw materials, freeze-dry, grind and sieve to obtain sediment powders with a particle size of not less than 100 mesh, place the sediment powders in a muffle furnace at 550°C for 1 hour, and wait for After cooling to room temperature, use 0.05mol / L sodium hydroxide aqueous solution to wash with water, then place it in a blast drying oven and evaporate to dryness to obtain activated deposits, which are set aside;

[0045] (2) Take kaolin, dry, grind and sieve to obtain kaolin powder with a particle size of not less than 100 mesh, fully mix the activated sediment and kaolin powder in proportion to form a mixed powder, and the consumption of the kaolin accounted for 100% of the mixed powder. 60wt% of the total mass of the body, spare;

[0046] (3) Using 0.2mol / L FeSO 4 The aqueous solution is used to mod...

Embodiment 3

[0049] The sediment interstitial water phosphate efficient removal material described in this example is prepared by the following method:

[0050] (1) Collect lake sediments as raw materials, freeze-dry, grind and sieve to obtain sediment powders with a particle size of not less than 100 mesh, place the sediment powders in a muffle furnace at 600°C for 2 hours, and wait for After cooling to room temperature, wash with 0.1 mol / L sodium hydroxide aqueous solution, then place in a blast drying oven and evaporate to dryness to obtain activated deposits, which are set aside;

[0051] (2) Take kaolin, dry, grind and sieve to obtain kaolin powder with a particle size of not less than 100 mesh, fully mix the activated sediment and kaolin powder in proportion to form a mixed powder, and the consumption of the kaolin accounted for 100% of the mixed powder. 50wt% of the total mass of the body, spare;

[0052] (3) Using 0.2mol / L FeSO 4 The aqueous solution is used to modify the mixed p...

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Abstract

The invention provides preparation method and application of efficient removing materials for interstitial water phosphate of sediments. Lake sediments are initiatively taken as basic materials of the materials and are subjected to calcination and alkaline washing, then the obtained material is mixed with kaolin, and mixed powder obtained is modified via ferric salt and then pore-forming agents are added for granulation and calcination shaping is peformed, and the low EPCo value and high Qmax value efficient removing materials for the interstitial water phosphate of the sediments are obtained. Concentration of the interstitial water phosphate of the sediments can be effectively cut down through the materials, and release of the phosphate of the sediments-water interfaces is restrained; desorption capacity of phosphate of the materials is weak and adsorption capacity is large, so that effective resistance and control of the materials on the sediments-water interfaces can be truly realized; the materials are low in cost, good in social and economic benefits, high in security, free of ecological risk on lake water, energy saving and environment friendly and remarkable in control effect on the sediments-water interfaces of different lakes of the Dian Lake during application.

Description

technical field [0001] The invention relates to a preparation method and application of a material for efficiently removing phosphate in sediment interstitial water, 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F11/00
CPCB01J20/02B01J20/0229B01J20/0281B01J20/12B01J2220/42B01J2220/4806B01J2220/4825C02F1/281C02F11/00C02F2101/105
Inventor 王圣瑞焦立新赵海超黎瑞
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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