Phosphate stabilizing treatment process for electroplating sludge

A technology for stabilizing and electroplating sludge, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc. Good thermal stability, good stability effect

Inactive Publication Date: 2007-11-07
SHANGHAI UNIV
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  • Summary
  • Abstract
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Problems solved by technology

The method of cement solidification can effectively prevent the dissolution of heavy metals. Although the harmless treatment of electroplating sludge is realized, it will also cause a higher volumetric expansion ratio.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] The process and steps of this embodiment are as follows:

[0016] (1). The electroplating sludge taken from the Shanghai Hazardous Waste Center was lightly washed, dried at 102°C, and then ground into powder for later use;

[0017] (2). At a temperature of 60°C, the analytically pure soluble sodium phosphate is prepared into a solution with a concentration of 0.25mol / L; the sodium phosphate and the electroplating sludge powder are in a weight ratio of 1:80 Mix and stir vigorously in a mixer for 4 hours to make it fully react; during the reaction process, use 1mol / L NaOH solution to control the pH value, and the pH value range is controlled to be 9-10;

[0018] (3). After the reaction is finished, it is naturally cooled to obtain a compound containing heavy metal Pb 2+ 、Cd 2+ The solid sample of sludge such as compound phosphate; then the sample is used for EPA toxicity leaching test, and the heavy metal Pb in the sample is determined 2+ 、Cd 2+ The leaching toxicity ...

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Abstract

The present invention relates to phosphate stabilizing treatment process for electroplating sludge, and belongs to the field of environment engineering technology. The process includes the following steps: 1. stoving electroplating sludge at 102 deg.c and grinding into powder; 2. mixing analytic pure soluble phosphate and the sludge powder in the weight ratio of 1 to 70-90 at 30-70 deg.c, and stirring powerfully for 4 hr for reaction while controlling the pH value in 8-11; and 3. cooling naturally after reaction to obtain solid sludge with combined heavy metal and phosphate. Thus treated electroplating sludge, EPA toxicity leaching test shows, can reach dangerous waste landfill standard.

Description

technical field [0001] The invention relates to a phosphate stabilization treatment method for electroplating sludge, belonging to the technical field of environmental engineering. Background technique [0002] The electroplating industry produces a large amount of electroplating wastewater. At present, the electroplating wastewater is generally treated by acid-base neutralization, flocculation and precipitation, etc., so a large amount of electroplating sludge will be generated. The electroplating sludge must be treated with safe, stable and solidified pretreatment before it can finally enter Landfill landfill. At present, the most effective stable solidification pretreatment method is cement solidification. By adding a certain proportion of cement to mix it with sludge and react under certain conditions, heavy metals can be stably solidified in its crystal lattice. The method of cement solidification can effectively prevent the dissolution of heavy metals. Although it rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12A62D3/00G01N33/00C02F103/16
Inventor 徐霞钱光人孙福成
Owner SHANGHAI UNIV
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