Preparation method and application of sediment modified material for controlling endogenous phosphorus load in sediments

A technology of load control and modified materials, applied in the fields of sludge treatment by temperature control, chemical instruments and methods, silicon compounds, etc., can solve the problems of high ecological risk and high risk of phosphorus release, and achieve improved adsorption capacity and strong adsorption. effect of ability

Active Publication Date: 2019-07-02
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 endogenous phosphorus load control sediment modification material with strong removal effect on low concentration phosphate in sediment interstitial water

Method used

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  • Preparation method and application of sediment modified material for controlling endogenous phosphorus load in sediments
  • Preparation method and application of sediment modified material for controlling endogenous phosphorus load in sediments
  • Preparation method and application of sediment modified material for controlling endogenous phosphorus load in sediments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The endogenous phosphorus load control sediment modification 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 particle size not less than 100 mesh, and set aside;

[0043] (2) Get zeolite, grind and sieve to obtain zeolite powder with particle size not less than 100 mesh, and set aside;

[0044] (3) Mix the sediment powder with the zeolite powder and polyaluminum chloride uniformly to form a mixed powder, the quality of the zeolite powder is 30% of the total mass of the mixed powder, and the polymer The quality of aluminum chloride is 8% of described mixed powder gross mass, standby;

[0045] (4) The mixed powder is soaked with water, the amount of water added accounts for 10wt% of the mixed powder mass, and then extruded into granules, and the molding material is roasted at 400 ° C for 3 hours to obtain a particle size of 3- 5mm of s...

Embodiment 2

[0047] The endogenous phosphorus load control sediment modification material described in this example is prepared by the following method:

[0048] (1) Collect lake bottom mud as raw material, freeze-dry, grind and sieve to obtain sediment powder with a particle size of 100 to 200 mesh, and set aside;

[0049] (2) Get the zeolite, grind and sieve to obtain a zeolite powder with a particle size of 100 to 200 meshes, and set aside;

[0050] (3) Mix the sediment powder with the zeolite powder and polyaluminum chloride uniformly to form a mixed powder, the quality of the zeolite powder is 50% of the total mass of the mixed powder, and the polymer The quality of aluminum chloride is 1% of the total mass of the mixed powder, for subsequent use;

[0051] (4) The mixed powder is soaked with water, the amount of water added accounts for 10wt% of the mixed powder mass, and then extruded into granules, and the molding material is roasted at 700 ° C for 2 hours to obtain a particle size...

Embodiment 3

[0053] The endogenous phosphorus load control sediment modification material described in this example is prepared by the following method:

[0054] (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;

[0055] (2) Get the zeolite, grind and sieve to obtain a zeolite powder with a particle size of 150 to 200 meshes, and set aside;

[0056] (3) Mix the sediment powder with the zeolite powder and polyaluminum chloride uniformly to form a mixed powder, the quality of the zeolite powder is 40% of the total mass of the mixed powder, and the polymer The quality of aluminum chloride is 9% of described mixed powder gross mass, standby;

[0057] (4) The mixed powder is soaked with water, the amount of water added accounts for 10wt% of the mixed powder mass, and then extruded into granules, and the molding material is calcined at 600°C for 2h to obtain a particle size of 4- 5mm sediment ...

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Abstract

The invention provides a preparation method and application of a sediment endogenous phosphorus load control bottom sediment modified material. With creatively lake sediments being basic materials, by the utilization of the processes of modifying, granulating, calcining and others of zeolite and aluminum polychlorid, the adsorption-desorption balance concentration of the material for phosphate is obviously reduced, and the maximum adsorbing quantity of the material is increased. By in-situ simulation of a sediment-water interface phosphate release process, it is proved that the material can effectively restrain release of sediment-water interface phosphate; because the desorption capacity of the material for the phosphate is low, and the adsorption capacity is large, the material can really achieve sediment endogenous phosphorus load control, and the purpose of improving the water quality of a lake / reservoir is achieved. Taken materials are cheap, and the material has good economic benefits and high safety and has no ecological risks for a water body of the lake, saves energy, is environmentally-friendly and achieves an obvious control effect on sediment-water interface phosphorus release at different lake regions of the Dian lake during application.

Description

technical field [0001] The invention relates to a preparation method and application of a sediment modification material for controlling endogenous phosphorus load of sediments, 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 s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00B01J20/10B01J20/30
CPCC02F11/00C02F11/12C02F11/18C02F2103/007
Inventor 焦立新王圣瑞赵海超丁帅
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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