Method for treating trace amount of cadmium in wastewater by chelation, coagulation and ultrafiltration combination

A chelation and trace technology, applied in the direction of flocculation/sedimentation water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problem of difficult removal of trace cadmium, achieve low cost, simple operation process, Good effect in removing trace heavy metal ions

Inactive Publication Date: 2011-08-10
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that it is difficult to remove trace cadmium in high-salt industrial wastewater, and provide an economical, effective and easy-to-apply method in engineering, so as to effectively remove trace cadmium to achieve the discharge of wastewater up to standard, or further advanced treatment to achieve industrial water recovery. with standard

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  • Method for treating trace amount of cadmium in wastewater by chelation, coagulation and ultrafiltration combination

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Embodiment 1

[0022] The nanofiltration effluent in the metallurgical wastewater treatment process of a smelter in Yunnan is the research object. The concentration of cadmium ions in the carbon effluent water is 0.019-0.025mg / L, Cl - The concentration is about 2500mg / L, and the initial pH is 11.

[0023] Using the method of the present invention to remove cadmium: 1) Take a certain volume of nanofiltration water, add 10 mg / L of EDTA, stir for 25 minutes, and various forms of cadmium are chelated. 2) Then add 50 mg / L PAC for coagulation and sedimentation for 30 minutes to coagulate and settle the EDTA chelated with cadmium. 3) carry out through ultrafiltration membrane, ultrafiltration treatment. The amount of residual cadmium detected by the analysis is 0.0048mg / L, reaching the limit value of cadmium in Class II water bodies (≤0.005mg / L) in the "Environmental Quality Standards for Surface Water" (GB 3838-2002).

Embodiment 2

[0025] The carbon filter effluent in the metallurgical wastewater treatment process of a smelter is the research object. The concentration of cadmium ions in the carbon filter water is 0.045-0.054mg / L, Cl - The concentration is about 2500mg / L, and the initial pH is 10.84.

[0026] Using the method of the present invention to remove cadmium: 1) Add 10 mg / L of EDTA to the effluent of the carbon filter, and perform stirring and chelating treatment for 0.5 h. 2) Add 100mg / L PAC for 0.5h to coagulate and settle the EDTA chelated with cadmium. 3) The ultrafiltration unit performs ultrafiltration treatment. 4) The amount of residual cadmium measured by analysis is 0.0041mg / L, reaching the limit value of cadmium in Class II water bodies (≤0.005mg / L) in the "Environmental Quality Standards for Surface Water" (GB 3838-2002).

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Abstract

The invention belongs to the technical field of water treatment, and in particular relates to a method for removing cadmium in high salt wastewater of a metallurgy industry by chelation and coagulation combination. The cadmium in various forms in the high salt wastewater is difficultly removed effectively by the conventional single method, so that a combination method for removing a trace amount of cadmium in water by chelation and coagulation of inorganic polymer and ultrafiltration. The method comprises the following steps of: chelating the cadmium in various forms by using ethylene diaminetetraacetic acid disodium salt (EDTA disodium salt); coagulating chelates of the cadmium and the EDTA disodium salt by using polyaluminium chloride (PAC); and performing effective filtration treatment by using an ultrafiltration unit to effectively remove the trace amount of cadmium in the water. The method is mainly applied to advanced wastewater treatment in the metallurgy industry and can alsobe applied to the effective removal of high salt heavy metal from wastewater in other industries.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a method for removing trace cadmium in high-salt wastewater. Background technique [0002] The discharge of industrial wastewater is the main cause of heavy metal cadmium pollution in water, and heavy metal pollution caused by mining, mineral processing, and metallurgical industries is particularly serious. Cadmium (Cd) is very toxic and can accumulate in the human body, mainly in the kidneys, causing serious damage to the kidneys and causing changes in the urinary system; destroying the metabolism of calcium in the body, that is, replacing calcium in the bones and making the bones soft , and finally disuse atrophy occurs; it has an inhibitory effect on immune function, can reduce the body's self-stabilizing function, and eventually lead to the occurrence of tumors. Therefore, the "Surface Water Environmental Quality Standard" (GB 3838-2002) has the lowest discharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F101/20
Inventor 赵旭刘会娟陈发源彭丽霞兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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