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Capping material for treating eutrophic lake and its prepn process

A technology of eutrophication and cap sealing, applied in chemical instruments and methods, sludge treatment, water/sewage treatment, etc., can solve the problem of low adsorption capacity and achieve the effect of inhibiting the release of phosphorus

Inactive Publication Date: 2007-11-07
SHANGHAI UNIV
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

The disadvantage of known chemical agents is that the adsorption capacity is relatively low, and they can only partially remove soluble phosphate and other nutrients in water. Therefore, artificial synthesis and development of high-performance capping materials for removing eutrophic salts have attracted more and more attention.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation process and steps of the capping material in the present embodiment are as follows:

[0021] Raw material 1. adopts calcite (Shanghai Unilever company product), it is pulverized to the granular material that particle size crosses 200 mesh sieves, and its percentage by weight ratio is 78%;

[0022] Raw material 2. adopts lanthanum chloride (Shanghai Yuelong Chemical Factory product), and its percentage by weight ratio is 10%;

[0023] The raw material ③ uses cement as a protective cement, and its weight percentage ratio is 12%. Take the above-mentioned lanthanum chloride and prepare it into an aqueous solution with a concentration of 1mol / L, and then add NH with a concentration of 2mol / L 4 Cl solution, adjust the pH value to 9.0, then add the above-mentioned calcite powder, stir at a constant temperature of 20°C for 30 minutes, a precipitate is formed after the reaction, the precipitate is washed with deionized water, then filtered and dried; After dryi...

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Abstract

The present invention is capping material for eliminating soluble phosphate and other trophic salts from eutrophic lake and its preparation process, and belongs to the field of environment protecting technology. The granular capping material is prepared with natural carbonate or calcium industry side product 65-70 %, RE tailing with Ce salt, La salt or RE oxide 10-15 % and inorganic cementing material cement, lime, gypsum or organic polymer adhesive 15-25 %, and through mixing at 20 deg.c, washing, filtering and drying. The capping material can absorb most of soluble phosphate and other trophic salts from water to form insoluble compound depositing to the surface of bottom mud, and the formed blocking adsorption layer can avoid release of phosphate from bottom mud to water body.

Description

technical field [0001] The invention relates to a capping material for treating lake eutrophication in situ and a preparation method thereof. More specifically, it is a capping material for removing nutrient salts such as soluble phosphate in eutrophic lakes and a preparation method thereof. It belongs to the technical field of environmental protection treatment. Background technique [0002] The main feature of lake pollution in China is water eutrophication, especially in urban lakes. Due to the interference of human activities, the eutrophication process is very rapid. The root cause of water eutrophication is that the soluble phosphate and other nutrients in the water exceed the standard, which exceeds the self-purification capacity of the lake. Lake sediment (also known as bottom mud) is an important reservoir of lake soluble phosphate and other nutrients. The salt will be gradually released and become the leading factor of the endogenous eutrophication of the lake. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F1/58C02F1/28C02F1/42
Inventor 钱光人于义忠陈丹邓发庆秦磊
Owner SHANGHAI UNIV
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