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Dredged sediment stabilizing reagent, preparation method and application thereof

A technology for dredging sediment and reagents, which is applied in the field of preparation and stabilization reagents for dredging sediment. It can solve the problems of poor stabilization effect of heavy metals, high phosphate leaching concentration, and limited market application value, and achieves simple and easy preparation and dosing methods. The effect of easy operation, low price, and adaptability to a wide range of engineering sites

Inactive Publication Date: 2015-07-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing stabilizing agents have problems such as high dosage, large volume increase ratio, wide range of pH changes, high phosphate leaching concentration, and poor stabilization effect of heavy metals under strong acidic conditions. These problems limit the traditional bottom sludge. Market Application Value of Curing and Stabilizing Reagents

Method used

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  • Dredged sediment stabilizing reagent, preparation method and application thereof
  • Dredged sediment stabilizing reagent, preparation method and application thereof
  • Dredged sediment stabilizing reagent, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Preparation raw materials: ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O), sodium borohydride (NaBH 4 ), polyvinylpyrrolidone (PVP K-30), acetone, absolute ethanol.

[0045] Preparation steps:

[0046] ① Prepare FeSO with a concentration of 0.01mol / L 4 ·7H 2 O solution, add 20g of polyvinylpyrrolidone (PVP K-30) per liter of this solution, and stir it mechanically to make it fully mixed.

[0047] ② Prepare NaBH with a concentration of 0.03mol / L 4 Solution, under the condition of mechanical stirring, 0.03mol / L NaBH 4 solution with FeSO in ① 4 ·7H 2 Equal volumes of the O solution were quickly mixed, continued to stir for a few seconds, and stopped stirring when the solution turned black.

[0048] ③Select the black precipitate by magnetic separation, wash thoroughly with distilled water 3 times first, then fully wash 3 times with acetone, and store in acetone. Such as figure 1 as shown, figure 1 It is a schematic diagram of the structure of the dredged sediment s...

Embodiment 2

[0050] ① Prepare FeSO with a concentration of 0.02mol / L 4 ·7H 2 O aqueous solution, add 10g of calcium lignosulfonate per liter of this solution, and stir it mechanically to make it fully mixed.

[0051] ② Prepare NaBH with a concentration of 0.06mol / L 4 aqueous solution, under the condition of mechanical stirring, 0.06mol / L NaBH 4 Aqueous solution and ① in FeSO 4 ·7H 2 Equal volumes of O aqueous solution were quickly mixed, continued to stir for a few seconds, and stopped stirring when the solution turned black.

[0052] ③The black precipitate was selected by magnetic separation method, first fully washed with distilled water 3 times, then fully washed 3 times with acetone, and stored in acetone, analyzed by MS3000h laser particle size analyzer, the particle size distribution of the prepared nano-iron particles was between Between 10 and 100nm, in line with the definition of nano-zero-valent iron in existing research results.

Embodiment 3

[0054] ① Prepare FeSO with a concentration of 0.015mol / L 4 ·7H 2 O aqueous solution, add 15g of sodium dodecylbenzenesulfonate per liter of this solution, and stir it mechanically to make it fully mixed.

[0055] ② Prepare NaBH with a concentration of 0.045mol / L 4 aqueous solution, under the condition of mechanical stirring, 0.045mol / L NaBH 4 Aqueous solution and ① in FeSO 4 ·7H 2 Equal volumes of O aqueous solution were quickly mixed, continued to stir for a few seconds, and stopped stirring when the solution turned black.

[0056] ③The black precipitate was selected by magnetic separation method, first fully washed with distilled water 3 times, then fully washed 3 times with acetone, and stored in acetone, analyzed by MS3000h laser particle size analyzer, the particle size distribution of the prepared nano-iron particles was between Between 10 and 100nm, in line with the definition of nano-zero-valent iron in existing research results.

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Abstract

The invention discloses a dredged sediment stabilizing reagent which is active nano-iron particles, wherein the main component of a crystal phase is alpha-Fe, and a Fe3O4 thin layer covers the surface of the crystal phase. A preparation method of the dredged sediment stabilizing reagent comprises the following steps: putting a surfactant in FeSO4.7H2O aqueous liquor; after fully mixing, adding NaBH4 aqueous liquor which is equal to the FeSO4.7H3O aqueous liquor in volume; when the liquor turns black, stopping stirring; sorting black precipitates by a magnetic method; firstly washing three times by using distilled water; then washing three times by acetone; and storing the product obtained in acetone. The dredged sediment stabilizing reagent can be used for disposing dredged sediment. The dredged sediment stabilizing reagent provided by the invention is obvious in stabilizing effect, and the heavy metal leaching toxicity of the disposed dredged sediment is greatly reduced, so that an advantageous condition for safely treating and disposing and recycling the dredged sediment is created, and therefore, the dredged sediment stabilizing reagent can be widely applied to a pre-treatment process of safe disposal and recycle of the dredged sediment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a dredging sediment stabilization reagent, a preparation method and an application thereof. Background technique [0002] The water flows received by surface water bodies include urban surface runoff, treated domestic sewage and industrial wastewater. The particulate matter and dissolved substances entrained in these water flows will settle under certain hydraulic conditions and chemical and biological effects, and turn into water bodies. sediment. During the formation of water body sediments, through a series of physical and chemical actions such as adsorption, complexation, and chemical reactions, the heavy metals entering the water body are gathered together, and when the environmental conditions at the interface between water and sediments change, they are enriched in the sediments The heavy metal pollutants will be released again and become the endogenous pol...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 柴晓利武博然侯琳琳
Owner TONGJI UNIV